Hobbs

Orval Fairbairn wrote:

Sometimes, unscrupulous owners will wire the Hobbs to the master switch,
so you get charges whenever the MS is ON.

My Hobbs is on the master, but the airplane has never been rented.

B A R R Y wrote:
Orval Fairbairn wrote:

Sometimes, unscrupulous owners will wire the Hobbs to the master
switch, so you get charges whenever the MS is ON.

My Hobbs is on the master, but the airplane has never been rented.

Which brings up a very interesting question. I'm building a plane that will
be licensed as an Experimental. Once inspected I'll have to test fly for 40
hours for phase one. If I use a Hobbs as the official time and hook it to
the MS I would probably end up reducing the phase one time considerably.

Gig 601XL Builder wrote:

Which brings up a very interesting question. I'm building a plane that will
be licensed as an Experimental. Once inspected I'll have to test fly for 40
hours for phase one. If I use a Hobbs as the official time and hook it to
the MS I would probably end up reducing the phase one time considerably.


That is interesting. Does the FAA specify tach vs. oil pressure Hobbs,
vs. electric Hobbs?

Think of how many pilot logbooks are based on electric Hobbs time.

"Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net wrote in message
...
B A R R Y wrote:
Orval Fairbairn wrote:

Sometimes, unscrupulous owners will wire the Hobbs to the master
switch, so you get charges whenever the MS is ON.

My Hobbs is on the master, but the airplane has never been rented.

Which brings up a very interesting question. I'm building a plane that
will be licensed as an Experimental. Once inspected I'll have to test fly
for 40 hours for phase one. If I use a Hobbs as the official time and hook
it to the MS I would probably end up reducing the phase one time
considerably.


Maybe. At what RPM is your tach even with elapsed time?

All of the rentals and the only plane I have owned turn the tach faster than
elapsed time at higher RPM. (By the way, what do you call the counter thingy
in a tach?) My max RPM is 2650. I have to bring it back to around 2350 to be
even with elapsed time. That happens to be at the top of a restricted zone
so I would never be at an advantage using Hobbs to log flight time unless I
spent most of the flight idling around the airport.

I happened to do most of my renting from a club that charged by the tach
time. Everyone thought that was great - and maybe it was for students who do
less cruising - but the tach time was always more than elapsed for my
weekend trips.

Is there some specficiation or reg as to what RPM equals elapsed time? If
you're renting, fly slower. You'll log more hours cheaper. If your test
flying, fly faster. You'll chew up more tach time per elapsed hour.
-------------------------------
Travis
Lake N3094P
PWK

On Jul 2, 12:31 pm, Orval Fairbairn wrote:
In article ,
B A R R Y wrote:

Larry R wrote:
Ok, I am *almost* embarrased to ask this question, but here goes. Do
Hobbs meters ever "go bad"?

Sure, it's a mechanical device.

On two occasions over the last few years, my Hobbs has failed to move.

For this reason, I always note my tach time and time off. The extra
start numbers will help just in case I don't notice for a while that the
Hobbs isn't running, and I need to have a fuel consumption figure.

Sometimes, unscrupulous owners will wire the Hobbs to the master switch,
so you get charges whenever the MS is ON.

My hobbs is wired to the master. Am I unscrupulous somehow??? What
would be the reason for someone to sit so long with the master on and
the engine not running?

-Robert

Robert M. Gary wrote:

My hobbs is wired to the master. Am I unscrupulous somehow??? What
would be the reason for someone to sit so long with the master on and
the engine not running?

Apparently the minute and a half (or less) that it takes you (and I) to
do the "electric loop" during preflight is flogging logs. G

At least in my case, I flip the switch, check the fuel pressure and
guages, do the lights / strobes / pitot heat / stall horn walk-around
checks, and turn it back off. That's pretty much it without the engine
running.

On Jul 3, 11:26 am, B A R R Y wrote:
Robert M. Gary wrote:

My hobbs is wired to the master. Am I unscrupulous somehow??? What
would be the reason for someone to sit so long with the master on and
the engine not running?

Apparently the minute and a half (or less) that it takes you (and I) to
do the "electric loop" during preflight is flogging logs. G

At least in my case, I flip the switch, check the fuel pressure and
guages, do the lights / strobes / pitot heat / stall horn walk-around
checks, and turn it back off. That's pretty much it without the engine
running.

Yes. even when I'm flying the glass cockpit planes I don't think I
have the master on without the engine running for more than a couple
of minutes. I don't think it would be a good idea to sit there with
the master on for long periods. Seems like the smart FBO would wire
the hobbs to the master to prevent people from running the battery for
no reason.

Robert

I've set in the parking area with the radio on waiting for an IFR
clearance,

Big John

************************************************** *****

On Tue, 03 Jul 2007 18:11:27 -0000, "Robert M. Gary"
wrote:

On Jul 2, 12:31 pm, Orval Fairbairn wrote:
In article ,
B A R R Y wrote:

Larry R wrote:
Ok, I am *almost* embarrased to ask this question, but here goes. Do
Hobbs meters ever "go bad"?

Sure, it's a mechanical device.

On two occasions over the last few years, my Hobbs has failed to move.

For this reason, I always note my tach time and time off. The extra
start numbers will help just in case I don't notice for a while that the
Hobbs isn't running, and I need to have a fuel consumption figure.

Sometimes, unscrupulous owners will wire the Hobbs to the master switch,
so you get charges whenever the MS is ON.

My hobbs is wired to the master. Am I unscrupulous somehow??? What
would be the reason for someone to sit so long with the master on and
the engine not running?

-Robert

Larry R wrote:
Ok, I am *almost* embarrased to ask this question, but here goes. Do
Hobbs meters ever "go bad"?

B A R R Y wrote:
Sure, it's a mechanical device.
On two occasions over the last few years, my Hobbs has failed to move.
For this reason, I always note my tach time and time off. The extra
start numbers will help just in case I don't notice for a while that the
Hobbs isn't running, and I need to have a fuel consumption figure.


I am a renter, so I have made a 5x8 index card to record the following
for each flight:
Date
Aircraft N-number
Departure Airport
Destination Airport
Left Main Fuel Tank Start/Stop
Right Main Fuel Tank Start/Stop
Left Tip Fuel Tank Start/Stop
Right Tip Fuel Tank Start/Stop
Hobbs Start/Stop
Tach Start/Stop
Clock Start/Stop
Clock Wheels Off/Wheels On

Larry R wrote:
Ok, I am *almost* embarrased to ask this question, but here goes. Do
Hobbs meters ever "go bad"? No, this isn't a joke!

Everything eventually "goes bad", just some things sooner than others.

A Hobbs meter is a mechanical counter with gears, bearings, a motor,
etc. so yeah, it can go bad.

--
Jim Pennino

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