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balloon tank easy-stopper

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Re: balloon tank easy-stopper

Post  pkrankow on Thu Jan 21, 2016 8:15 pm

Pay attention how the fuel line is run and then you can pinch it as holding the plane to start the engine.

There are clips that look like they belong on a IV in the hospital that pinch the line off. If the clip is fastened to the fuselage then it can be released with a fingertip when needed.
http://www.hobbyking.com/hobbyking/store/__7673__Fuel_Line_Stopper.html

On horseshoe backs install a piece of brass tubing as a connector so the connection behind the engine mountings is left undisturbed for fueling on non-pressure tanks. There are other methods of course.

Phil
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Re: balloon tank easy-stopper

Post  Marleysky on Fri Jan 22, 2016 12:45 pm

PeterJGregory wrote:For someone who hasn't used balloon tanks before, what is the drill for filling and connecting to the engine without squirting fuel all over the place?
Thanks -

Here is one that Rusty posted awhile back:

https://www.coxengineforum.com/t2001-balloon-bladder-ver-2-0-yes-another-project#29393

He also has a couple of excellent videos on pressure bladder construction and operation.
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Re: balloon tank easy-stopper

Post  roddie on Fri Jan 22, 2016 7:07 pm

I need to watch those vids again. They're real good.
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Re: balloon tank easy-stopper

Post  getback on Sat Jan 23, 2016 8:27 am

Thanks Phil I was wondering were I could pick up one of those am still thinking local surgical supply or something in that category. The plastic hemostats I have but are just to much time involved in getting to it and releasing in time for the engine to get fuel before it cuts off . Shocked getback
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Re: balloon tank easy-stopper

Post  akjgardner on Mon Jul 03, 2017 5:51 pm

I'm Starting to stock up on pill bottles from when I got My knee replaced, I was wondering if this balloon Idea would work in a small pill bottle? The bottle is approximately the size of a 1 once fuel tank. any Ideas ?
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Re: balloon tank easy-stopper

Post  roddie on Mon Jul 03, 2017 6:48 pm

akjgardner wrote:I'm Starting to stock up on pill bottles from when I got My knee replaced, I was wondering if this balloon Idea would work in a small pill bottle? The bottle is approximately the size of a 1 once fuel tank. any Ideas ?

Sure it would Joe. It's only a "capsule" to keep the balloon from flopping-around during flight. I bought a bagful of "assorted-shapes" party balloons. Look for them in the greeting-card/toy-aisles at the markets that you frequent. They're generally 6" diameter balloons when inflated with air. Some are the "long-type".. which I like.. because they'll fit into a more streamlined capsule.. and give you a little more length to your fuel pick-up line.



This helps to keep fuel flowing as the balloon collapses..



Your pill-bottle should work fine. I'd cut the bottom off for streamlining if your mounting it outside in the airstream. In that case; secure the bottle with rubber-bands.
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Re: balloon tank easy-stopper

Post  akjgardner on Mon Jul 03, 2017 7:41 pm

I'v got several Guillows 400 series airplane kits and plan to use this idea when building them. The pill bottle would fit in a former right behind the firewall helping to prevent fuel from leaking over the inside of the frame.Plus I'm cheap and these 1 ounce fuel tanks are pretty expensive for what they are. Thanks for the help Roddie
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Re: balloon tank easy-stopper

Post  roddie on Mon Jul 03, 2017 8:19 pm

akjgardner wrote:I'v got several Guillows 400 series airplane kits and plan to use this idea when building them. The pill bottle would fit in a former right behind the firewall helping to prevent fuel from leaking over the inside of the frame.Plus I'm cheap and these 1 ounce fuel tanks are pretty expensive for what they are. Thanks for the help Roddie

Glad to help Joe. Andras (balogh) has a lot of experience actually "running" balloon-tanks in his RC airplanes. I do not. His have built-up fuse-construction and the balloon-tanks are enclosed.. which sounds like what you're planning. Andras runs them exclusively.. so he can give you tips on the best way to arrange the plumbing for ease of fueling, reliability.. etc.
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Re: balloon tank easy-stopper

Post  NEW222 on Mon Jul 03, 2017 11:17 pm

One of the last times I traveled to the USA, I was fortunate to have my hotel shampoos in nice little bottles with metal lids and a seal. A couple pieces of brass tubing, a dab of JR WELD, and wheel collar, I have a nice homemade clunk tank. Of course tank style is dependant on the application.
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Re: balloon tank easy-stopper

Post  balogh on Tue Jul 04, 2017 6:41 am

roddie wrote:
akjgardner wrote:I'v got several Guillows 400 series airplane kits and plan to use this idea when building them. The pill bottle would fit in a former right behind the firewall helping to prevent fuel from leaking over the inside of the frame.Plus I'm cheap and these 1 ounce fuel tanks are pretty expensive for what they are. Thanks for the help Roddie

Glad to help Joe. Andras (balogh) has a lot of experience actually "running" balloon-tanks in his RC airplanes. I do not. His have built-up fuse-construction and the balloon-tanks are enclosed.. which sounds like what you're planning. Andras runs them exclusively.. so he can give you tips on the best way to arrange the plumbing for ease of fueling, reliability.. etc.

Thanks Roddie for your referral.

akjgardner, please see my typical ballon tank arrangement below. Hobbyshops sell the rubber stopper with 2 or 3 holes on it.



You may want to plug one out of the 3 with e.g. the stem of a plastic earbud. The 2 others lend themselves for a fill line (1) and supply line (2). The tank itself is a normal rubber party balloon that kids play with/carry to school events. The rubber stopper fits snugly in the neck of the balloon, no need to tie a wire or anything foreign around the neck.



For better utilization of the space in the nose of the plane I use L-shaped plastic tubes (these are plastic conduits sold with servo pushrods also made of plastic, that I heat with a hairdryer and bend with the plastic pushroad kept inside to prevent the tube from buckling when shaping the L, then pull out the plastic pushrod.)  for the fuel line intersection with the stopper, so that the bent tubes should reduce to overall lenght of the tank setup and allow the placement of the tank as forward as possible.

The balloon tank makes an air-vent unnecessary, no heavy clunk to keep the supply line end under fuel level in wing-overs is needed, keeps the fuel foam-free, and fills the plane nose whatever shape it has, very efficiently. And the whole setup is very cheap. I cover the free ends of engine mount bolts occassionally  protruding into the tank compartment of the fuselage  nose with a short silicone fuel tube just in case the balloon rams into the firewall on an unplanned landing. The silicone sleeve on the bolt ends will prevent the balloon from getting punctured. Of course this assumes the bolt ends are accessible from the tank compartment to apply the sleeves on them every time you replace the engine on the firewall.


Last edited by balogh on Tue Jul 04, 2017 8:24 am; edited 1 time in total
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Re: balloon tank easy-stopper

Post  akjgardner on Tue Jul 04, 2017 8:21 am

Thanks for the help guys.I plan on building a couple guillows airplanes this winter useing this idea.
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Re: balloon tank easy-stopper

Post  andrew on Tue Jul 04, 2017 10:26 am

Texas Timers carries a lot of fittings for both balloon and bladder tanks. Rubber balloons have a tendency to deteriorate quickly with glow fuel. Another option for balloon (non-pressure) tanks is to use the fingers from nitrile gloves. Many places sell nitrile gloves for pennies each.
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