Due to space constraints, I want to turn my tank with the clunk forward. Would this have any negative effect on engine operation?

I think it probably would have an adverse affect. Whenever you had (1) the plane in a nose high position for a significant period of time and (2) the fuel level in the tank somewhat less than full, then the engine would probably quit due to fuel starvation since the fuel would be at the bottom and rear portion of the tank, due to gravity. IMHO putting the clunk forward should not be done.

Not good - as above

Tim

That's no different that a nose down attitude with the tank in normal orientation, right?

The difference is that it is unlikely that a plane would be in a nose down position, while generating a significant amount of power, for very long whereas its common for a plane to be in a nose up position for significant periods of time while producing a lot of power. When going nose down and not generating a lot power, ususally the fuel that is in the line from the clunk to carb will keep the engine running until the fuel gets back to the clunk.

Hi!
This is easily solved! Just buy a Tettra "bubble-less" fueltank (no clunk used), this you could turn any way you want!
Se the picture of my GP GEE-BEE R-2

Regards!
Jan K
Sweden

Is the Tettra Bubbleless tank available in North America? If so, where? Thanks

Hi!
Ofcourse ...I buy them from Dave Shadel(former World champ in pylonracing).
US YS importer. Just contact Performance Specialties in Nevada.
Central Hobbies has them too.
Or buy them from me...
http://hem.passagen.se/airracing

The tank in the GEE BEE R-2 is a 450cc helitank.

Regards!
Jan K
Sweden

Why not run the brass toward the back of the tank and bend it towad the front? Then put your clunk line on that.

David

Have you ever swung a bucket half full of water around and over your head without spilling the water? The fuel in the tank has the same properties. On a down line the fuel is pushed to the aft end of the tank as long as you have positive G's, I think.

Well honestly.. that depends on how one flies his plane...

Unless you make REALLY LONG power dives, putting your tank in backwards will have very little or no ill effects.

And, as long as you make sure the clunk follows the fuel, no matter what you do, then there's no problem...