Thanks in advance for any help. I tried the search and didn't really see too many threads on this. When I'm in a long spin straight down or a flat spin, my engine often quits from lack of fuel. I have shortened my aerobatics and have no problem with the engine. My question is, what if I would put a small 1 or 2 ounce tank, with no clunk, in line between the engine and main tank. Pressure would keep fuel supplied (in theory) to the small tank and being no clunk, would be supplied with fuel at any angle. I would just have an inlet tube and outlet tube, and would have constant fuel supply as long as the tank was full. Again, I think pressure would keep it filled.
Please let me know if anyone has tried this and if anyone thinks this would work. Also, if anyone has any better ideas, I would really appreciate that too.
Thanks,
Steve

I understand your theory but you cannot depend on all the air being out of your little tank.

People do this all the time. They buy the smallest clunk tank that they can find and install it clunk and all. This tank needs to be as close as possible to the needle valve.

Good luck,

Jim

I wish I could remember where I saw that add for a fuel tank with a bladder inside. The fuel goes into the bladder, and the muffler pressure squeezes it out again. Once it's been primed, you never get air into the fuel tank again.

Check the various online RC supply stores. I think it was from Tower Hobbies, but Im not sure anymore. I saw the add about 2 years ago...

Thanks for your help guys! I've been racking my brain on this one. I'm new to the hobby and this is one that has puzzled me. I'll try the extra tank this week and I'll let you know.

Bubbleless tanks have been in long use by the Pylon crowd. They will absolutely prevent the problems you mention. They require no foam and function as SHradio describes. Additionally they are typically mounted on the CG of pylon types well behind the engine and work well even though the Q40 class can endure loads well past 20 'G's. I sometimes use them on my sport aircraft that experiance feed problems besides the racers.

The pattern crowd has begun to discover them and the Tetra brand is avaliable in sizes from 4 to 16 oz. at Central Hobbies, Jett engineering also sells their propritary version. Prices range from 16 to 20 dollars.

John

Don't know if this is related.

I had the same problem for a while with my Saito FA-100 and Ultra Stick 60. It turned out that my static idle was a little too low. It would be fine for level flight and landing patterns but on the 1st flight of the day my 1st spin usually ended up with a dead-stick landing -- not a problem considering the airplane's CROW and altitude at the time of engine shutdwon. Try increasing your throttle trim one click just before you go into the maneuver or leave your throttle open just above the idle.