tips tanks for extra fuel

[zadwit]

I used to work on Dehavilland Beaver aircraft, highwing. Each wing tip was a fuel tank that held 23 imp gallons. It had a ram air vent on top to pressurize the tank. There was a valve in the cabin that allowed the tips to feed fuel into the main tank. YOu were not supposed to transfer fuel until the main tank 56imp gallons was 1/2 down. IT is a simple sytem and might work on the gulls. Food forthought.
IT also relieves the bending load on the wing because the weight is out at the tip so Dehavilland did not add this fuel weight to the gross wt of the aircraft.

[blaswichk]

Complicated, and extra fuel weight should be considered as total gross weight, even thought it's close to the cg point. Weight is weight, and no free ride there. The tips would have to be totally remade with a fuel resistant type fiberglass as I'm sure ours would weep and leak, not good, and of course all the plumbing, fill port, etc. I'm for buying a 3-5 gallon extra tank to try and mount above the standard tank. Just my .02

[zadwit]

Well here are a couple of other things to think about. 231 cubic inches =one gallon of gas in volumn
Also, West Marine and other marine catalogs show all different sizes of fuel tanks, DOT approved! So you might find one that is the right size for you. Good luck and remember the only time you have too much fuel is when you are on fire!

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[earthstaraircraft]

Hi
The main reason that aviation is dying is that it is to expensive!
To combat this problem I make the plane more efficient!!
Use HKS engine and an now you use 1/2 the gas and no oil burned.
No need for expensive complex fuel systems that will cause management problems and meeting the naybors.
Keep it simple, a wing tank system will be heavy and cost a lot more than the wing wen all the problems are dealt with.
I have built a lot of wing tanks, tip tanks, external tanks. DONT EVAN THINK ABOUT IT!!!😬
Happy Flying
Mark
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[earthstaraircraft]

Fuel is heavy!
Weight takes power to overcome gravity!
To much gas= not enough performance, ask any airline pilot.
Happy Flying
Mark

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[zadwit]

Fuel is heavy especially in an ultralight. It is better to manage the flight, look at winds aloft for tail winds, determine what is the best power setting for maximum range, and also maximum endurance in case you get lost and have to loiter!!

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[rahulchoudhary73]

yeah, hows the eGull battery, volumetrically? Martin?

i'd put in a 1L (61 cubic inches) pressure cooker of steaming water in the eGull drivetrain to start with. maybe smaller. one day i tell ya, rudolf diesel will nod, thats cool. 1gallon of gas, only for long trips. heck, even a car can do 100km/l as of 2014

[mkoxxy]

Two main reasons to go electric: get off fossil fuel, and fewer things to
go wrong (1 moving part!). Both apply to my recent purchase of a Bolt EV.
The Bolt has 60kWh, my eGull is trying to get by on 5.6kWh. Just as with
cars, to keep things simple (and reliable), rather than add another power
system it would make more sense to add spare battery capacity or some other
source of electric energy. I could add another 2.8kWh or upgrade to the
latest Zero battery (over 13kWh now, or 16.4kWh with the new "Power Tank").
But these batteries are still too heavy for aviation purposes.
Supercapacitors are - still - just around the corner, and the (consumable)
aluminum power source idea may yet pan out.
But if endurance is important to you, nothing beats gasoline for now
(photovoltaics are even less practical than batteries). I would go for a
spare tank behind the seat, for simplicity, or replace the engine with
something very efficient like the HKS, as Mark said. I cannot imagine
flying for more than a couple hours at a time, except to set some sort of
record.
Martin

[rahulchoudhary73]

Gratulations; 65.6kW sounds like plenty lithium for one human; would be nice for an ev to come with a detachable battery briefcase too (ebike, eboat, offgrid wknd, etc), plenty of ducklings to line up in a row, i guess

even a hybrid gull would have one moving part, in the critical drive path. still surprised lots of magnets to make more electricity only show up with Boeing and higher.

rc

[zadwit]

I had to laugh when I reread this post. You are absolutely correct, it is just I saw a Titan Tornado with these little tear drop fuel tanks 5 gal each attached to the bottom of the wing like “bombs”. Same kind of translucent plastic tank used on the birdman ultralights in Canada.

Also, after looking at the stabilator attach fittings, they are beefier than what I am used to seeing on Piper Cherokee series C-140, Cherokee 6, Lance, and they all have this horrible 6 cylinder engine on dynafocal mounts that shake the hell out of the tail on start up and shut down. Never did like that set up on Pipers but the Gull is built hell for stout.

Progress is a little slow on my Gull right now but I work on it each day and hopefully will have it flying this summer.
Going over to Oregon to Meet up with Martin Koxxy in a few weeks and look at his Gulle the red and silver electric one. I am going to pickup up an enclosed trailer in Oregon and use it to store my Gull in when I travel away from the area for any length of time…

Mark


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