PW wing template anyone?

[Mark Zivley[_3_]]

Greetings,

A bit of a long shot, but I am planning on rebuilding the somewhat crude, and now failing, wing wheel for a PW-5. If anyone just happened to have a wing profile template in electronic format for the area approximately at the outboard end of the aileron location, please let me know. Ok, it's a lot of a long shot....

Thanks,

Mark

[Dan Marotta]

You can make a profile template very quickly with a piece of cardboard,
a fat marker, and a pair of scissors.

Dan
5J

On 2/15/21 7:19 AM, Mark Zivley wrote:
> Greetings,
>
> A bit of a long shot, but I am planning on rebuilding the somewhat crude, and now failing, wing wheel for a PW-5. If anyone just happened to have a wing profile template in electronic format for the area approximately at the outboard end of the aileron location, please let me know. Ok, it's a lot of a long shot....
>
> Thanks,
>
> Mark
>

[John Johnson]

> You can make a profile template very quickly with a piece of cardboard,
> a fat marker, and a pair of scissors.
>
> Dan
> 5J

Hey Dan,
Not trying to sound any dumber than I am - but is there a technique to the cardboard and scissors approach? Or is it just a cycle of trimming and fitting until you get it right? I don't need a very accurate template for my case (need a sheet metal shop to make some tie down saddles for by DG300), I'm just thinking about how to get it right the first time.

thx, JJ

[Dan Marotta]

Hi JJ,

Stand the cardboard vertically on the wing parallel to the chord, or on
the under side if you want a template of the bottom. Lay the marker on
the wing parallel to the span and perpendicular to the cardboard. Move
the marker in a chord wise direction to mark the cardboard. Trim and
repeat as necessary. You'll get a perfect template for that wing station.

I made saddles for my LS-6a almost 30 years ago by covering the wing
(top and bottom) with aluminum foil at the desired location. I then
covered the foil with plastic wrap, the plastic wrap with felt, and laid
up fiberglass over top of that. Made a perfectly fitted cuff (on one
wing, at least).

Good luck and let us know how it comes out.

Dan
5J

On 2/15/21 12:49 PM, John Johnson wrote:
>> You can make a profile template very quickly with a piece of cardboard,
>> a fat marker, and a pair of scissors.
>>
>> Dan
>> 5J
>
> Hey Dan,
> Not trying to sound any dumber than I am - but is there a technique to the cardboard and scissors approach? Or is it just a cycle of trimming and fitting until you get it right? I don't need a very accurate template for my case (need a sheet metal shop to make some tie down saddles for by DG300), I'm just thinking about how to get it right the first time.
>
> thx, JJ
>

[Martin Gregorie[_6_]]

On Mon, 15 Feb 2021 11:49:54 -0800, John Johnson wrote:

>> You can make a profile template very quickly with a piece of cardboard,
>> a fat marker, and a pair of scissors.
>>
>> Dan 5J
>
> Hey Dan,
> Not trying to sound any dumber than I am - but is there a technique to
> the cardboard and scissors approach? Or is it just a cycle of
> trimming and fitting until you get it right? I don't need a very
> accurate template for my case (need a sheet metal shop to make some
> tie down saddles for by DG300), I'm just thinking about how to get it
> right the first time.
>
You can also make a pair of tiedowns like I made 3-seasons or so ago for
my Libelle. These should be easily adaptable to any glider that doesn't
use winglets:

https://www.gregorie.org/gliding/tie-down/

And, for extra security, make a pair of trestles from light wood. Mine
are from 50mm x 20mm lumber, hinged at the top and padded with stapled-on
pieces of rubber-backed carpet tile. I put the trestles under each wing
at about at about 2/3 span and have used the tie-downs with 'Claw'
anchors (which are excellent and were no more expensive than the
corkscrew type). I've used this system both with a set of CloudDancer
covers and without.

The only caveat is that balsa is getting to be unobtainable now that the
Chinese seem to own all the balsa-tree plantations and are using the lot
for wind-turbine blades. However, I only made my male mould from balsa
because I have a stack of it. Moderately hard blue foam insulation,
Depron foam sheet or ever corrugated cardboard packaging should work just
as well.


--
Martin | martin at
Gregorie | gregorie dot org

[Mark Zivley[_3_]]

RAS to the rescue...

Many thanks to Roger who was kind enough to send some coordinates that should allow me to get a template cut very close to final shape before making the drive out to the gliderport to do a check. Should save a lot of time.

Mark


On Monday, February 15, 2021 at 8:19:50 AM UTC-6, Mark Zivley wrote:
> Greetings,
>
> A bit of a long shot, but I am planning on rebuilding the somewhat crude, and now failing, wing wheel for a PW-5. If anyone just happened to have a wing profile template in electronic format for the area approximately at the outboard end of the aileron location, please let me know. Ok, it's a lot of a long shot....
>
> Thanks,
>
> Mark

[John Johnson]

On Monday, February 15, 2021 at 3:34:00 PM UTC-7, Martin Gregorie wrote:
> On Mon, 15 Feb 2021 11:49:54 -0800, John Johnson wrote:
>
> >> You can make a profile template very quickly with a piece of cardboard,
> >> a fat marker, and a pair of scissors.
> >>
> >> Dan 5J
> >
> > Hey Dan,
> > Not trying to sound any dumber than I am - but is there a technique to
> > the cardboard and scissors approach? Or is it just a cycle of
> > trimming and fitting until you get it right? I don't need a very
> > accurate template for my case (need a sheet metal shop to make some
> > tie down saddles for by DG300), I'm just thinking about how to get it
> > right the first time.
> >
> You can also make a pair of tiedowns like I made 3-seasons or so ago for
> my Libelle. These should be easily adaptable to any glider that doesn't
> use winglets:
>
> https://www.gregorie.org/gliding/tie-down/
>
> And, for extra security, make a pair of trestles from light wood. Mine
> are from 50mm x 20mm lumber, hinged at the top and padded with stapled-on
> pieces of rubber-backed carpet tile. I put the trestles under each wing
> at about at about 2/3 span and have used the tie-downs with 'Claw'
> anchors (which are excellent and were no more expensive than the
> corkscrew type). I've used this system both with a set of CloudDancer
> covers and without.
>
> The only caveat is that balsa is getting to be unobtainable now that the
> Chinese seem to own all the balsa-tree plantations and are using the lot
> for wind-turbine blades. However, I only made my male mould from balsa
> because I have a stack of it. Moderately hard blue foam insulation,
> Depron foam sheet or ever corrugated cardboard packaging should work just
> as well.
>
>
> --
> Martin | martin at
> Gregorie | gregorie dot org
Dan, thanks - will get to work on it shortly. (I was wondering if there was a mark once/cut once solution I was missing)
Martin, Your solution looks elegant but I do have winglets. Also, I prefer to have larger load distributing saddles nearer to mid-span (next to the start of the ailerons). We get some vicious micro-bursts and I worry about concentrating the hold-down load at the tips.

thx, JJ