Today's Message Index:
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1. 05:17 AM - fuel tank, size/ location (Douwe Blumberg)
2. 07:47 AM - Re: fuel tank, size/ location (woodflier)
Message 1
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| Subject: | fuel tank, size/ location |
Hi Harvey,
I agree that this is probably not going to be a good location. The farther
back you get, the lower the outlet will be during climb in relation to the
carb. I've heard of fuel flow issues with the tank up front so moving it
back will very likely invoke some more. Problem with trying to max capacity
in the nose is it forces the bottom of the tank lower and lower; hence the
flow issues. Lots of guys build bigger tanks, but end up with a lot of
unusable fuel in there.
A wing tank works well, has no fuel flow issue and opens up tons of room up
front. or a wing tank with a header tank; more complex, but works if
designed well.
If you're looking for a single-seat, have you considered the Sky Scout?
Super cute plane and I hear it performs quite nicely. The aircampers
smaller cousin. If I were wanting a single-seat Piet-type, I'd build one in
a heartbeat.
Good luck!
Douwe
Time: 05:50:12 AM PST US
Subject: Pietenpol-List: Fuel Tank, Size/Location
From: "Harvey Plummer" <plummerharvey@yahoo.com>
Thanks guys for all the previous info on a nose tank.
Now the question is will I have enough pressure for gravity feed to the
Carb? I am planning to have a single seat Pietenpol. I would like to locate
the nose tank where the passenger seat opening would be. I am thinking an
oval shaped tank 16" deep at the center and about 18" long. It will be
located with approximately 8" of the tank above the longerons and 8" below.
With the fuel valve at the rear of the tank will there be enough pressure
for fuel to flow to the carburator on a Corvair engine with 2 gallons of
unusable fuel in the tank?
Looking for opinions, experience or suggestions?
Message 2
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| Subject: | Re: fuel tank, size/ location |
Harvey, I built a Pietenpol, with a fuselage tank in front of the front coc
kpit, basically Mike Cuy's set up. The tank holds 16 gallons, of which I re
gard the last 5 as not usable. That still gives me over 2 1/2 hours with so
me reserve, and believe me, after that amount of time flying a Pietenpol, y
ou are ready to get out of it! There is some CG change as the fuel burns of
f but it's not major and I don't have a trim system. Hands off, with a full
tank, my airplane will slowly drop its nose. At about 45 minutes, it balan
ces perfectly and after that, has a nose up tendency, increasingly after ab
out an hour and fifteen minutes. Either way, the stick forces are so minor,
I don't consciously have to push or pull on the stick. With that tank in t
he front of the fuselage, I got 13.5 gallons fuel flow with 5 gallons in th
e tank, and with the mains up on blocks and the tail down. You want to be s
ure you have twice the full power fuel burn as a flow. Below that number, c
onsider that unusable fuel.
Matt Paxton
NX629ML
-----Original Message-----
From: Douwe Blumberg <douwe@douwestudios.com>
Sent: Tue, Oct 20, 2015 8:17 am
Subject: Pietenpol-List: fuel tank, size/ location
Hi Harvey,
I agree that this is probably not going to be a good location. The farther
back you get, the lower the outlet will be during climb in relation to the
carb. I=99ve heard of fuel flow issues with the tank up front so mo
ving it back will very likely invoke some more. Problem with trying to max
capacity in the nose is it forces the bottom of the tank lower and lower;
hence the flow issues. Lots of guys build bigger tanks, but end up with a
lot of unusable fuel in there.
A wing tank works well, has no fuel flow issue and opens up tons of room up
front or a wing tank with a header tank; more complex, but works
if designed well.
If you=99re looking for a single-seat, have you considered the Sky Sc
out? Super cute plane and I hear it performs quite nicely. The aircampers
smaller cousin. If I were wanting a single-seat Piet-type, I=99d bu
ild one in a heartbeat.
Good luck!
Douwe
Time: 05:50:12 AM PST US
Subject: Pietenpol-List: Fuel Tank, Size/Location
From: "Harvey Plummer" <plummerharvey@yahoo.com>
Thanks guys for all the previous info on a nose tank.
Now the question is will I have enough pressure for gravity feed to the Car
b? I am planning to have a single seat Pietenpol. I would like to locate th
e nose tank where the passenger seat opening would be. I am thinking an ova
l shaped tank 16" deep at the center and about 18" long. It will be located
with approximately 8" of the tank above the longerons and 8" below. With t
he fuel valve at the rear of the tank will there be enough pressure for fue
l to flow to the carburator on a Corvair engine with 2 gallons of unusable
fuel in the tank?
Looking for opinions, experience or suggestions?
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