? on tank feed will or not

It will work but wont pull all the fuel out of the tank, which is fine as this is a control line
project with limited flying time. I would bench test it out of the wing see how much run
time. You can then sort out a way to manage how much fuel you put in the tank for a
comfortable flight time.

1/2A Nut wrote:It will work but wont pull all the fuel out of the tank, which is fine as this is a control line
project with limited flying time. I would bench test it out of the wing see how much run
time. You can then sort out a way to manage how much fuel you put in the tank for a
comfortable flight time.

I will test it on the bench, it doesn't need to pull it all out, the tube holds 1 oz.

You have to vent, or pressurize.
I built tanks for my Mossie that have only two connections. One to the carb, and one from pressure. I disconnect the carb and fill via the pressure line while holding the airplane so the carb Feed is highest. Then I reconnect the carb and set the model right side up on it's landing gear. I hope that makes sense.
I do like your tank...it just needs that vent, or pressure.

PS...the balloon tanks collapse completely/readily due to atmospheric pressure. Your tank won't.

944_Jim wrote:PS...the balloon tanks collapse completely/readily due to atmospheric pressure. Your tank won't.

I think your correct. I will give it a try and see how much fuel it will pull, if not enough I will add a vent somehow.

OG,
Since you mentioned a balloon tank and you still have an open bay...maybe you can consider a balloon tank in the bay.

Close in the top and bottom, close in from top spar to bottom spar. Make your top plate removable, say out of oil bottle plastic (flexible, fuel-proof, easily replaced). This is so you can open the bay to service the tank. You could even insert the balloon in your bottle. Just make sure to put a good size hole in the bottle to allow atmospheric pressure in.

You'll need to remove the fuel line from the spray bar to fill the balloon.

oldguy wrote:

944_Jim wrote:PS...the balloon tanks collapse completely/readily due to atmospheric pressure. Your tank won't.

I think your correct. I will give it a try and see how much fuel it will pull, if not enough I will add a vent somehow.

Hi Jim, I like the concept of using that squeeze-bottle for an "in-wing" C/L tank.. and had an idea for a vent. It's "quick and dirty".. but might be an easy way to do it.

You would need an aerosol "spray-can tube" (sometimes furnished with spray-lubricants.. and fits into the nozzle for pinpoint spray-application).

Pierce a hole smaller-than the tube into the "underside" of your tank, at its thickest area (close to where the cap screws-on). Push the tube "up" through the hole, until it stops against the top/inner-wall of your bottle. If the tube fits nice and tight.. you may not have to seal around it.



Snip-off the tube afterward; to a length where it's long enough to protrude out-through a hole in the bottom/wing-sheeting. You can use the plumbing that you already have (with the Tee) to fill the tank with either; the needle "closed".. or the feed-line pinched-off. When the tank is full; fuel will squirt out the tube under the wing.

I like "944_Jim's" idea of a removable plastic/fuel-proof access-plate. Maybe fabricate it for the "bottom".. with a hole for the vent-tube to exit.

Good Luck!!

944_Jim wrote:OG,
Since you mentioned a balloon tank and you still have an open bay...maybe you can consider a balloon tank in the bay.

Close in the top and bottom,  close in from top spar to bottom spar. Make your top plate removable, say out of oil bottle plastic (flexible, fuel-proof, easily replaced). This is so you can open the bay to service the tank. You could even insert the balloon in your bottle. Just make sure to put a good size hole in the bottle to allow atmospheric pressure in.

You'll need to remove the fuel line from the spray bar to fill the balloon.

Jim a like the idea, I may work on that idea on the side to perfect it, but not on this plane. Thanks for the idea I like it.

roddie wrote:

oldguy wrote:

944_Jim wrote:PS...the balloon tanks collapse completely/readily due to atmospheric pressure. Your tank won't.

I think your correct. I will give it a try and see how much fuel it will pull, if not enough I will add a vent somehow.

Hi Jim, I like the concept of using that squeeze-bottle for an "in-wing" C/L tank.. and had an idea for a vent. It's "quick and dirty".. but might be an easy way to do it.

You would need an aerosol "spray-can tube" (sometimes furnished with spray-lubricants.. and fits into the nozzle for pinpoint spray-application).

Pierce a hole smaller-than the tube into the "underside" of your tank, at its thickest area (close to where the cap screws-on). Push the tube "up" through the hole, until it stops against the top/inner-wall of your bottle. If the tube fits nice and tight.. you may not have to seal around it.  



Snip-off the tube afterward; to a length where it's long enough to protrude out-through a hole in the bottom/wing-sheeting. You can use the plumbing that you already have (with the Tee) to fill the tank with either; the needle "closed".. or the feed-line pinched-off. When the tank is full; fuel will squirt out the tube under the wing.

I like "944_Jim's" idea of a removable plastic/fuel-proof access-plate. Maybe fabricate it for the "bottom".. with a hole for the vent-tube to exit.

Good Luck!!

Roddie I was thinking of the same type of vent setup, my question is what type of sealant would work well for sealing the tube if needed? Any ideas?
Thanks

I've used E6000 to glue canopies and engine cowls in place. My roughly 25% nitro fuel hasn't caused a "let go" yet.
It may be worth a try for the tank...at this point I'm just throwing ideas at the wall to see what sticks!

944_Jim wrote:I've used E6000 to glue canopies and engine cowls in place. My roughly 25% nitro fuel hasn't caused a "let go" yet.
It may be worth a try for the tank...at this point I'm just throwing ideas at the wall to see what sticks!

Thanks, maybe that E6000 will stick.

I'm not sure what would work for that application Jim.. but I would definitely seal-off and "fuel-proof" the tank-bay within the wing. When I say "fuel-proof".. many modelers would offer different methods/materials for doing that. You don't want any fuel-leaks to soak-into your models framework. Be sure to take the necessary steps to avoid that.

The E6000 suggestion was intended for sealing the tank vent.
For fuel proofing the bay I'd thin down some 30 minute epoxy in order to paint the bay.