Accident report - PDA's can restrict emergency exit

[Ramy]

http://tinyurl.com/yzfpzb

With the increase of use of gizmos in the cockpit I think it is worth
warning the fliying community of this potential deadly mistake,
especially with glare shield instalations of instruments such as TPAS.
I almost fell trap to it myself when considered wiring my glare shield
installed TPAS to the glider battery. Make sure you can jettison your
canopy and bail out easily.

Be careful out there,

Ramy

[bumper]

"Ramy" > wrote in message
ps.com...
> http://tinyurl.com/yzfpzb
>
> With the increase of use of gizmos in the cockpit I think it is worth
> warning the fliying community of this potential deadly mistake,
> especially with glare shield instalations of instruments such as TPAS.
> I almost fell trap to it myself when considered wiring my glare shield
> installed TPAS to the glider battery. Make sure you can jettison your
> canopy and bail out easily.
>
> Be careful out there,
>
> Ramy
>

Good point, Ramy.

All wires, that could potentially interfere with canopy jettison, should
have a pull-apart type plug/jack. Alternately, the wire might be light
enough so that it is easily frangible. Although, even small gauge insulated
wire can be surprisingly strong. For my TPAS, I use an adequate length of
extra wire, secured under the glare shield with easy to pull apart Velcro
taps, so that the canopy will be well on its way before the wire surplus is
taken up. This to allow the inertia to more easily break the wire or yank
the little plug out the back of the unit. I'm not ready to test this just
yet, but I'm reasonably sure it'll work (g).

bumper

My PDA blocks the red canopy jettison handle on the right side in my 26e,
however, the PDA is mounted on a gooseneck that easily deflects out of the
way when pulling the handle

[Andy[_1_]]

Ramy wrote:
>Make sure you can jettison your
> canopy and bail out easily.

And don't expect the canopy to fly off when you pull the handles. I
had reason to open the rear latches of my ASW28 in flight. I expected
to have to pull down hard to keep the canopy from rising. Instead I
had to push up firmly to release my relief tube from under the
instrument panel.

I don't want to find out what happens if the forward attach points are
also released but I'm expecting to have to push hard to make the canopy
depart.

Andy

[[email protected]]

Ramy wrote

> > With the increase of use of gizmos in the cockpit I think it is worth
> > warning the fliying community of this potential deadly mistake,
> > especially with glare shield instalations of instruments such as TPAS.
> > I almost fell trap to it myself when considered wiring my glare shield
> > installed TPAS to the glider battery. Make sure you can jettison your
> > canopy and bail out easily.

Right, Ramy. The same goes for the GPS loggers many of us have parked
on the side rail of the canopy. My Cambridge Model 20 is threaded for a
mounting screw but I use Velcro instead to provide one more point of
failure (a positive thing this time!) in case one of the connectors
hangs up if I jettison the canopy (actually, in the case of the Model
20, I suspect the connectors and the wires to which they are affixed
might be reluctant to part without considerable force). Yeah, a logger
flailing around on the end of a wire while I try to exit doesn't sound
like any fun but neither does the canopy flailing around at the end of
said wire.

Antenna connections are likely to be a little trickier because the coax
is stronger than a 22 ga. wire. Pushing the BNC connection together but
not locking it by turning the ring provides a measure of safety, though
you should probably retain the connector some other way (rubber band,
etc.).

The best way to check this is to release the canopy on the ground and
lift it off. Anything that hangs up is a potential death trap.

Chip Bearden
ASW 24 "JB"

[Kilo Charlie]

"Ramy" > wrote in message
ps.com...
> http://tinyurl.com/yzfpzb
>
> With the increase of use of gizmos in the cockpit I think it is worth
> warning the fliying community of this potential deadly mistake,
> especially with glare shield instalations of instruments such as TPAS.
> I almost fell trap to it myself when considered wiring my glare shield
> installed TPAS to the glider battery. Make sure you can jettison your
> canopy and bail out easily.
>

Good point thanks for passing it on. I also am guilty of doing just
this.....I have a VL mounted on the canopy rail along with a PDA. I have
rationalized that neither "appear" to have strong connections.....the PDA
wire is small and the VL connector is the phone type which looks like it
would part easily. I also use the velcro idea Chip talked about.

One of the issues with an old guy like myself is that my vision is poor and
I find it nice to be able to not only look at the PDA closeup but to be able
to change settings on it without my fingers bouncing around at arms length.
Maybe time to reconsider it all though.

Casey Lenox
KC
Phoenix

[Ramy]

I tried various PDA instalations over the years. What works best for me
and also the simplest solution is to mount it on the leg above the knee
in a 30-45 degrees angle using a simple mount. The mount is strapped to
the leg and the PDA velcroed to the mount.
The advantages are:
1 - Easy to read and access the PDA.
2 - Does not restrict outside visibility.
3 - Due to beeing sightly lower in the cockpit it gets less direct sun
reflections.
4 - In case of a bailout the PDA would part easily from the velcro.
5 - Does not require more heads down than scanning the instrument panel
as it is almost at the same line of sight.

Ramy

Kilo Charlie wrote:
> "Ramy" > wrote in message
> ps.com...
> > http://tinyurl.com/yzfpzb
> >
> > With the increase of use of gizmos in the cockpit I think it is worth
> > warning the fliying community of this potential deadly mistake,
> > especially with glare shield instalations of instruments such as TPAS.
> > I almost fell trap to it myself when considered wiring my glare shield
> > installed TPAS to the glider battery. Make sure you can jettison your
> > canopy and bail out easily.
> >
>
> Good point thanks for passing it on. I also am guilty of doing just
> this.....I have a VL mounted on the canopy rail along with a PDA. I have
> rationalized that neither "appear" to have strong connections.....the PDA
> wire is small and the VL connector is the phone type which looks like it
> would part easily. I also use the velcro idea Chip talked about.
>
> One of the issues with an old guy like myself is that my vision is poor and
> I find it nice to be able to not only look at the PDA closeup but to be able
> to change settings on it without my fingers bouncing around at arms length.
> Maybe time to reconsider it all though.
>
> Casey Lenox
> KC
> Phoenix

[Herb]

Andy,

I had the same relief tube problem in my LS8 in flight. Decided to
unlock and lift the canopy slightly to free the tube. You release both
the forward and rear canopy locks with the same handle in my glider,
one on each side. As you found out, I had to push considerably hard to
get the canopy off the rails. Then, I needed a third hand to yank on
the pee tube (and another one to keep the glider from porpoising). Pee
tube clear and un-kinked is now on my check list.
Regarding the subject at hand: my transponder antenna is on the glare
shield and has the pull-apart connector on the cable that has been
discussed here. I also have a seperate ground cable from the aluminum
ground plane under the glare shield to the glider metal structure that
seems to have improved my transponder operation.

Herb, J7

Andy wrote:
> >Make sure you can jettison your
> > canopy and bail out easily.
>
> And don't expect the canopy to fly off when you pull the handles. I
> had reason to open the rear latches of my ASW28 in flight. I expected
> to have to pull down hard to keep the canopy from rising. Instead I
> had to push up firmly to release my relief tube from under the
> instrument panel.
>
> I don't want to find out what happens if the forward attach points are
> also released but I'm expecting to have to push hard to make the canopy
> depart.
>
> Andy

[[email protected]]

On a related note saw an ad for the new mac laptop and they made the
power cord attach w/a magnet, to keep the computer from hitting the
ground when someone trips on the power cord. I havent looked but it
would be interesting to see if there are off the shelf magnetic wire
connectors.

On Dec 7, 5:06 pm, "Herb" > wrote:
> Andy,
>
> I had the same relief tube problem in my LS8 in flight. Decided to
> unlock and lift the canopy slightly to free the tube. You release both
> the forward and rear canopy locks with the same handle in my glider,
> one on each side. As you found out, I had to push considerably hard to
> get the canopy off the rails. Then, I needed a third hand to yank on
> the pee tube (and another one to keep the glider from porpoising). Pee
> tube clear and un-kinked is now on my check list.
> Regarding the subject at hand: my transponder antenna is on the glare
> shield and has the pull-apart connector on the cable that has been
> discussed here. I also have a seperate ground cable from the aluminum
> ground plane under the glare shield to the glider metal structure that
> seems to have improved my transponder operation.
>
> Herb, J7
>
> Andy wrote:
> > >Make sure you can jettison your
> > > canopy and bail out easily.
>
> > And don't expect the canopy to fly off when you pull the handles. I
> > had reason to open the rear latches of my ASW28 in flight. I expected
> > to have to pull down hard to keep the canopy from rising. Instead I
> > had to push up firmly to release my relief tube from under the
> > instrument panel.
>
> > I don't want to find out what happens if the forward attach points are
> > also released but I'm expecting to have to push hard to make the canopy
> > depart.
>
> > Andy

[[email protected]]

Ramy, glad you posted this. My microphone is mounted to the canopy and
I should check to make sure it would not restrict the canopy jettison.
My PDA is actually on a gooseneck from the panel and is not a factor.

Darren

[ContestID67]

Interesting topic. I had considered putting the PDA on the rail of the
canopy.

One possible simple "break away" connector that was recently
recommended to me is a USB connector. They are simple and inexpensive
gold plated slide connectors with four contacts. Purchase a USB
"extension cord" which has a male and a female connector (don't ask me
which is which). Cut the cord in the middle and splice it into your
serial connection to the PDA

All you need are four connections;

USB Pin 1 - Power +5Vdc - DB-9 pin 8 (may be vendor specific)
USB Pin 2 - Transmit - DB-9 pin 2
USB Pin 3 - Recieve - DB-9 pin 3
USB Pin 4 - Ground - DB-9 pin 5

Anyway, if you cut the PDA cradle cable, there should only be four
wires. Three may be a shield which you should connect to the shield of
the USB. Connect each to whatever you want at the USB connector and
call it the "<fill in your last name> proprietary cabling standard".

- John

[Simon Taylor]

At 14:36 08 December 2006, T O D D P A T T I S T wrote:
wrote:
>
>> new mac laptop and they made the
>>power cord attach w/a magnet, to keep the computer
>>from hitting the
>>ground when someone trips on the power cord.
>
>My wife has a hot pot that constantly holds near-boiling
>water and dispenses with a pump on request. It uses
>one of
>those magnetically attached power cords to prevent
>anyone
>from getting burned if you trip over the cord. They
>must be
>sold somewhere.
>--
>T o d d P a t t i s t - 'WH' Ventus C
>(Remove DONTSPAMME from address to email reply.)
>

Wouldn't the magnet ideas cause compass issues?

[Shawn]

Simon Taylor wrote:
> At 14:36 08 December 2006, T O D D P A T T I S T wrote:
>> wrote:
>>
>>> new mac laptop and they made the
>>> power cord attach w/a magnet, to keep the computer
>> >from hitting the
>>> ground when someone trips on the power cord.
>> My wife has a hot pot that constantly holds near-boiling
>> water and dispenses with a pump on request. It uses
>> one of
>> those magnetically attached power cords to prevent
>> anyone
>>from getting burned if you trip over the cord. They
>> must be
>> sold somewhere.
>> --
>> T o d d P a t t i s t - 'WH' Ventus C
>> (Remove DONTSPAMME from address to email reply.)
>>
>
> Wouldn't the magnet ideas cause compass issues?

Microphones and radio speakers have magnets. I don't know how magnetic
shielding works but it exists. TV speakers are shielded so they don't
interfere with the CRT-at least in those old fashioned TVs :-)


Shawn

[Bert Willing]

Ever tried to pull off an USB connector by pulling across ?!
Any cable on the canopy system is a serious thread.

"ContestID67" > wrote in message
ups.com...
> Interesting topic. I had considered putting the PDA on the rail of the
> canopy.
>
> One possible simple "break away" connector that was recently
> recommended to me is a USB connector. They are simple and inexpensive
> gold plated slide connectors with four contacts. Purchase a USB
> "extension cord" which has a male and a female connector (don't ask me
> which is which). Cut the cord in the middle and splice it into your
> serial connection to the PDA
>
> All you need are four connections;
>
> USB Pin 1 - Power +5Vdc - DB-9 pin 8 (may be vendor specific)
> USB Pin 2 - Transmit - DB-9 pin 2
> USB Pin 3 - Recieve - DB-9 pin 3
> USB Pin 4 - Ground - DB-9 pin 5
>
> Anyway, if you cut the PDA cradle cable, there should only be four
> wires. Three may be a shield which you should connect to the shield of
> the USB. Connect each to whatever you want at the USB connector and
> call it the "<fill in your last name> proprietary cabling standard".
>
> - John
>

[Ian[_1_]]

On Tue, 12 Dec 2006 09:22:59 +0100, Bert Willing wrote:

> Ever tried to pull off an USB connector by pulling across ?! Any cable on
> the canopy system is a serious thread.

I have a Volkslogger mounted on the canopy frame of our LS3a. I spliced a
male/female pair of "mic" cables into the wire connecting it to the
battery such that they will part if the canopy is jettisoned. Some
comments:

- The screw retaining ring on the plugs has been removed.

- The cables on either side of the plugs are secured onto the support post
and canopy frame respectively with cable ties. The geometry is such that
if the canopy jettison latch is released the load on the wires will always
be axial which quickly pulls the plugs apart.

- There is a small loop in the cable to allow just enough slack for the
canopy to open on its "parallelogram" mechanism without the cable becoming
tight.

- When the canopy is closed the loop forms in a location where it can't be
easily kicked loose on entry/exit or in flight.

- A fair amount of planning and testing went into getting it to work
just right. These installations are easier to wrong than right.

I have tested it a number of times by taking the canopy off without
first releasing the cable. It always pulls out cleanly without any force
or damage. On the flip side we have yet to loose a trace due to the wire
coming loose when it is not supposed to.

My mic plugs have 4 pins, of which I am using two so there are two spare.
When I finally get around to installing a PDA I have some options to
use the same cable for PDA power etc.

But when we installed a Flarm I avoided mounting it on the canopy because
that would have required a second plug set for the remote display cable.
Getting this to work side by side with the existing cable looked a bit
tricky.

If I did it again I would experiment with RJ45 plugs with the
locking tabs broken off. It may be possible to mount two cables in
parallel to have enough pairs to meet future requirements.


Regards


Ian

[Jim Vincent]

I also used male and female sterop plugs for the connections made to the
canopy.

The issue that's been bugging me is what to do with the external catheter.
In the flurry of an egress, it does take a few moments to disconnect the QD
from the drain tubing. Maybe a winter project is a small spring loaded
guillotine below the seat pan that would cut the drain tubing.

"Ian" > wrote in message
...
> On Tue, 12 Dec 2006 09:22:59 +0100, Bert Willing wrote:
>
>> Ever tried to pull off an USB connector by pulling across ?! Any cable on
>> the canopy system is a serious thread.
>
> I have a Volkslogger mounted on the canopy frame of our LS3a. I spliced a
> male/female pair of "mic" cables into the wire connecting it to the
> battery such that they will part if the canopy is jettisoned. Some
> comments:
>
> - The screw retaining ring on the plugs has been removed.
>
> - The cables on either side of the plugs are secured onto the support post
> and canopy frame respectively with cable ties. The geometry is such that
> if the canopy jettison latch is released the load on the wires will always
> be axial which quickly pulls the plugs apart.
>
> - There is a small loop in the cable to allow just enough slack for the
> canopy to open on its "parallelogram" mechanism without the cable becoming
> tight.
>
> - When the canopy is closed the loop forms in a location where it can't be
> easily kicked loose on entry/exit or in flight.
>
> - A fair amount of planning and testing went into getting it to work
> just right. These installations are easier to wrong than right.
>
> I have tested it a number of times by taking the canopy off without
> first releasing the cable. It always pulls out cleanly without any force
> or damage. On the flip side we have yet to loose a trace due to the wire
> coming loose when it is not supposed to.
>
> My mic plugs have 4 pins, of which I am using two so there are two spare.
> When I finally get around to installing a PDA I have some options to
> use the same cable for PDA power etc.
>
> But when we installed a Flarm I avoided mounting it on the canopy because
> that would have required a second plug set for the remote display cable.
> Getting this to work side by side with the existing cable looked a bit
> tricky.
>
> If I did it again I would experiment with RJ45 plugs with the
> locking tabs broken off. It may be possible to mount two cables in
> parallel to have enough pairs to meet future requirements.
>
>
> Regards
>
>
> Ian
>

[01-- Zero One]

Jim, let's not discuss spring-loaded guillotines and pee tubes in the
same thread! :-)



Larry

"01" Zero One

USA



"Jim Vincent" > wrote in message
:

> I also used male and female sterop plugs for the connections made to the
> canopy.
>
> The issue that's been bugging me is what to do with the external catheter.
> In the flurry of an egress, it does take a few moments to disconnect the QD
> from the drain tubing. Maybe a winter project is a small spring loaded
> guillotine below the seat pan that would cut the drain tubing.
>
> "Ian" > wrote in message
> ...
> > On Tue, 12 Dec 2006 09:22:59 +0100, Bert Willing wrote:
> >
> >> Ever tried to pull off an USB connector by pulling across ?! Any cable on
> >> the canopy system is a serious thread.
> >
> > I have a Volkslogger mounted on the canopy frame of our LS3a. I spliced a
> > male/female pair of "mic" cables into the wire connecting it to the
> > battery such that they will part if the canopy is jettisoned. Some
> > comments:
> >
> > - The screw retaining ring on the plugs has been removed.
> >
> > - The cables on either side of the plugs are secured onto the support post
> > and canopy frame respectively with cable ties. The geometry is such that
> > if the canopy jettison latch is released the load on the wires will always
> > be axial which quickly pulls the plugs apart.
> >
> > - There is a small loop in the cable to allow just enough slack for the
> > canopy to open on its "parallelogram" mechanism without the cable becoming
> > tight.
> >
> > - When the canopy is closed the loop forms in a location where it can't be
> > easily kicked loose on entry/exit or in flight.
> >
> > - A fair amount of planning and testing went into getting it to work
> > just right. These installations are easier to wrong than right.
> >
> > I have tested it a number of times by taking the canopy off without
> > first releasing the cable. It always pulls out cleanly without any force
> > or damage. On the flip side we have yet to loose a trace due to the wire
> > coming loose when it is not supposed to.
> >
> > My mic plugs have 4 pins, of which I am using two so there are two spare.
> > When I finally get around to installing a PDA I have some options to
> > use the same cable for PDA power etc.
> >
> > But when we installed a Flarm I avoided mounting it on the canopy because
> > that would have required a second plug set for the remote display cable.
> > Getting this to work side by side with the existing cable looked a bit
> > tricky.
> >
> > If I did it again I would experiment with RJ45 plugs with the
> > locking tabs broken off. It may be possible to mount two cables in
> > parallel to have enough pairs to meet future requirements.
> >
> >
> > Regards
> >
> >
> > Ian
> >

[Jim Vincent]

I just did some calculations considering accelerations, masses and mechanics of materials. It turns out that if I stay connected to the pee tube and bail out at under 103 kts, the force of the bail out will extend my penis by 2.8" before the latex tubing breaks (in colder temperatures the max bailout speed does drop). Well, that extension of 2.8" falls just between the elastic and yield (not ultimate) values of my penis, so after extending out by 2.8", my penis will retract by 1.6" for a net permanent gain of 1.2" Mind you, 1.2" is only about a 10% increase over current length, but that's OK too. ;-)

However, after some feedback from some friends, I decided it is best to only connect the quick disconnect when I have to use the pee tube. No need for the guillotine.


"01-- Zero One" > wrote in message . ..
Jim, let's not discuss spring-loaded guillotines and pee tubes in the same thread! J



Larry

"01" Zero One

USA



"Jim Vincent" > wrote in message :

> I also used male and female sterop plugs for the connections made to the
> canopy.
>
> The issue that's been bugging me is what to do with the external catheter.
> In the flurry of an egress, it does take a few moments to disconnect the QD
> from the drain tubing. Maybe a winter project is a small spring loaded
> guillotine below the seat pan that would cut the drain tubing.
>
> "Ian" > wrote in message
> ...
> > On Tue, 12 Dec 2006 09:22:59 +0100, Bert Willing wrote:
> >
> >> Ever tried to pull off an USB connector by pulling across ?! Any cable on
> >> the canopy system is a serious thread.
> >
> > I have a Volkslogger mounted on the canopy frame of our LS3a. I spliced a
> > male/female pair of "mic" cables into the wire connecting it to the
> > battery such that they will part if the canopy is jettisoned. Some
> > comments:
> >
> > - The screw retaining ring on the plugs has been removed.
> >
> > - The cables on either side of the plugs are secured onto the support post
> > and canopy frame respectively with cable ties. The geometry is such that
> > if the canopy jettison latch is released the load on the wires will always
> > be axial which quickly pulls the plugs apart.
> >
> > - There is a small loop in the cable to allow just enough slack for the
> > canopy to open on its "parallelogram" mechanism without the cable becoming
> > tight.
> >
> > - When the canopy is closed the loop forms in a location where it can't be
> > easily kicked loose on entry/exit or in flight.
> >
> > - A fair amount of planning and testing went into getting it to work
> > just right. These installations are easier to wrong than right.
> >
> > I have tested it a number of times by taking the canopy off without
> > first releasing the cable. It always pulls out cleanly without any force
> > or damage. On the flip side we have yet to loose a trace due to the wire
> > coming loose when it is not supposed to.
> >
> > My mic plugs have 4 pins, of which I am using two so there are two spare.
> > When I finally get around to installing a PDA I have some options to
> > use the same cable for PDA power etc.
> >
> > But when we installed a Flarm I avoided mounting it on the canopy because
> > that would have required a second plug set for the remote display cable.
> > Getting this to work side by side with the existing cable looked a bit
> > tricky.
> >
> > If I did it again I would experiment with RJ45 plugs with the
> > locking tabs broken off. It may be possible to mount two cables in
> > parallel to have enough pairs to meet future requirements.
> >
> >
> > Regards
> >
> >
> > Ian
> >

[bumper]

Real glider pilots have no need for pee tubes, quick connects, funnels,
misc. plumbing parts etc. Why do you think they installed that storm window
so low on the canopy side instead of directly overhead?

Just be sure to slow to below 60 knots prior to "gear" extension to avoid
the possibility of flutter - - guaranteed to be an unpleasant experience.
Frostbite, though rare, can be nasty.

bumper
"Jim Vincent" > wrote in message
. ..
I just did some calculations considering accelerations, masses and mechanics
of materials. It turns out that if I stay connected to the pee tube and
bail out at under 103 kts, the force of the bail out will extend my penis by
2.8" before the latex tubing breaks (in colder temperatures the max bailout
speed does drop). Well, that extension of 2.8" falls just between the
elastic and yield (not ultimate) values of my penis, so after extending out
by 2.8", my penis will retract by 1.6" for a net permanent gain of 1.2"
Mind you, 1.2" is only about a 10% increase over current length, but that's
OK too. ;-)

However, after some feedback from some friends, I decided it is best to only
connect the quick disconnect when I have to use the pee tube. No need for
the guillotine.


"01-- Zero One" > wrote in message
. ..
Jim, let's not discuss spring-loaded guillotines and pee tubes in the same
thread! J

Larry
"01" Zero One
USA


"Jim Vincent" > wrote in message
:

> I also used male and female sterop plugs for the connections made to the
> canopy.
>
> The issue that's been bugging me is what to do with the external catheter.
> In the flurry of an egress, it does take a few moments to disconnect the
> QD
> from the drain tubing. Maybe a winter project is a small spring loaded
> guillotine below the seat pan that would cut the drain tubing.
>
> "Ian" > wrote in message
> ...
> > On Tue, 12 Dec 2006 09:22:59 +0100, Bert Willing wrote:
> >
> >> Ever tried to pull off an USB connector by pulling across ?! Any cable
> >> on
> >> the canopy system is a serious thread.
> >
> > I have a Volkslogger mounted on the canopy frame of our LS3a. I spliced
> > a
> > male/female pair of "mic" cables into the wire connecting it to the
> > battery such that they will part if the canopy is jettisoned. Some
> > comments:
> >
> > - The screw retaining ring on the plugs has been removed.
> >
> > - The cables on either side of the plugs are secured onto the support
> > post
> > and canopy frame respectively with cable ties. The geometry is such that
> > if the canopy jettison latch is released the load on the wires will
> > always
> > be axial which quickly pulls the plugs apart.
> >
> > - There is a small loop in the cable to allow just enough slack for the
> > canopy to open on its "parallelogram" mechanism without the cable
> > becoming
> > tight.
> >
> > - When the canopy is closed the loop forms in a location where it can't
> > be
> > easily kicked loose on entry/exit or in flight.
> >
> > - A fair amount of planning and testing went into getting it to work
> > just right. These installations are easier to wrong than right.
> >
> > I have tested it a number of times by taking the canopy off without
> > first releasing the cable. It always pulls out cleanly without any force
> > or damage. On the flip side we have yet to loose a trace due to the wire
> > coming loose when it is not supposed to.
> >
> > My mic plugs have 4 pins, of which I am using two so there are two
> > spare.
> > When I finally get around to installing a PDA I have some options to
> > use the same cable for PDA power etc.
> >
> > But when we installed a Flarm I avoided mounting it on the canopy
> > because
> > that would have required a second plug set for the remote display cable.
> > Getting this to work side by side with the existing cable looked a bit
> > tricky.
> >
> > If I did it again I would experiment with RJ45 plugs with the
> > locking tabs broken off. It may be possible to mount two cables in
> > parallel to have enough pairs to meet future requirements.
> >
> >
> > Regards
> >
> >
> > Ian
> >

[[email protected]]

And L\D refers to Length\Diameter?

Bob

[Nyal Williams]

Oh, my!

We didn't get to this conversation until February,
a couple of years ago.

That one was finished by some PW-5 pilot who claimed
to 'tap it' with the rudder.


At 19:00 21 December 2006, Bumper wrote:
>Real glider pilots have no need for pee tubes, quick
>connects, funnels,
>misc. plumbing parts etc. Why do you think they installed
>that storm window
>so low on the canopy side instead of directly overhead?
>
>Just be sure to slow to below 60 knots prior to 'gear'
>extension to avoid
>the possibility of flutter - - guaranteed to be an
>unpleasant experience.
>Frostbite, though rare, can be nasty.
>
>bumper
>'Jim Vincent' wrote in message
. ..
>I just did some calculations considering accelerations,
>masses and mechanics
>of materials. It turns out that if I stay connected
>to the pee tube and
>bail out at under 103 kts, the force of the bail out
>will extend my penis by
>2.8' before the latex tubing breaks (in colder temperatures
>the max bailout
>speed does drop). Well, that extension of 2.8' falls
>just between the
>elastic and yield (not ultimate) values of my penis,
>so after extending out
>by 2.8', my penis will retract by 1.6' for a net permanent
>gain of 1.2'
>Mind you, 1.2' is only about a 10% increase over current
>length, but that's
>OK too. ;-)
>
>However, after some feedback from some friends, I decided
>it is best to only
>connect the quick disconnect when I have to use the
>pee tube. No need for
>the guillotine.
>
>
>'01-- Zero One' wrote in message
. ..
>Jim, let's not discuss spring-loaded guillotines and
>pee tubes in the same
>thread! J
>
>Larry
>'01' Zero One
>USA
>
>
>'Jim Vincent' wrote in message
:
>
>> I also used male and female sterop plugs for the connections
>>made to the
>> canopy.
>>
>> The issue that's been bugging me is what to do with
>>the external catheter.
>> In the flurry of an egress, it does take a few moments
>>to disconnect the
>> QD
>> from the drain tubing. Maybe a winter project is
>>a small spring loaded
>> guillotine below the seat pan that would cut the drain
>>tubing.
>>
>> 'Ian' wrote in message
>> ...
>> > On Tue, 12 Dec 2006 09:22:59 +0100, Bert Willing
>>>wrote:
>> >
>> >> Ever tried to pull off an USB connector by pulling
>>>>across ?! Any cable
>> >> on
>> >> the canopy system is a serious thread.
>> >
>> > I have a Volkslogger mounted on the canopy frame
>>>of our LS3a. I spliced
>> > a
>> > male/female pair of 'mic' cables into the wire connecting
>>>it to the
>> > battery such that they will part if the canopy is
>>>jettisoned. Some
>> > comments:
>> >
>> > - The screw retaining ring on the plugs has been
>>>removed.
>> >
>> > - The cables on either side of the plugs are secured
>>>onto the support
>> > post
>> > and canopy frame respectively with cable ties. The
>>>geometry is such that
>> > if the canopy jettison latch is released the load
>>>on the wires will
>> > always
>> > be axial which quickly pulls the plugs apart.
>> >
>> > - There is a small loop in the cable to allow just
>>>enough slack for the
>> > canopy to open on its 'parallelogram' mechanism without
>>>the cable
>> > becoming
>> > tight.
>> >
>> > - When the canopy is closed the loop forms in a location
>>>where it can't
>> > be
>> > easily kicked loose on entry/exit or in flight.
>> >
>> > - A fair amount of planning and testing went into
>>>getting it to work
>> > just right. These installations are easier to wrong
>>>than right.
>> >
>> > I have tested it a number of times by taking the
>>>canopy off without
>> > first releasing the cable. It always pulls out cleanly
>>>without any force
>> > or damage. On the flip side we have yet to loose
>>>a trace due to the wire
>> > coming loose when it is not supposed to.
>> >
>> > My mic plugs have 4 pins, of which I am using two
>>>so there are two
>> > spare.
>> > When I finally get around to installing a PDA I have
>>>some options to
>> > use the same cable for PDA power etc.
>> >
>> > But when we installed a Flarm I avoided mounting
>>>it on the canopy
>> > because
>> > that would have required a second plug set for the
>>>remote display cable.
>> > Getting this to work side by side with the existing
>>>cable looked a bit
>> > tricky.
>> >
>> > If I did it again I would experiment with RJ45 plugs
>>>with the
>> > locking tabs broken off. It may be possible to mount
>>>two cables in
>> > parallel to have enough pairs to meet future requirements.
>> >
>> >
>> > Regards
>> >
>> >
>> > Ian
>> >
>
>
>

[Herb]

Here's an accident report from a mid-air in which the cabling between
canopy-frame mounted equipment and the panel may have played a role.
Unfortunately, the pilot did not survive.
http://www.dg-flugzeugbau.de/Data/unfallbericht-pda.pdf
The accident happened in the UK, the link is copied from the DG monthly
newsletter.

Herb


Ramy wrote:
> http://tinyurl.com/yzfpzb
>
> With the increase of use of gizmos in the cockpit I think it is worth
> warning the fliying community of this potential deadly mistake,
> especially with glare shield instalations of instruments such as TPAS.
> I almost fell trap to it myself when considered wiring my glare shield
> installed TPAS to the glider battery. Make sure you can jettison your
> canopy and bail out easily.
>
> Be careful out there,
>
> Ramy

[Dan G]

Herb, if you had followed the link in the first post in this thread,
you would have seen that you were about to link to the exact same
accident report.


Dan

Herb wrote:

> Here's an accident report from a mid-air in which the cabling between
> canopy-frame mounted equipment and the panel may have played a role.
> Unfortunately, the pilot did not survive.
> http://www.dg-flugzeugbau.de/Data/unfallbericht-pda.pdf
> The accident happened in the UK, the link is copied from the DG monthly
> newsletter.
>
> Herb
>
>
> Ramy wrote:
> > http://tinyurl.com/yzfpzb
> >
> > With the increase of use of gizmos in the cockpit I think it is worth
> > warning the fliying community of this potential deadly mistake,
> > especially with glare shield instalations of instruments such as TPAS.
> > I almost fell trap to it myself when considered wiring my glare shield
> > installed TPAS to the glider battery. Make sure you can jettison your
> > canopy and bail out easily.
> >
> > Be careful out there,
> >
> > Ramy