I have an 11 oz hangar 9 fuel tank that came with my h9 twist arf. I'm new to rc planes but isn't the clunk suppose to fall forward if the plane is in a dive. Mine stays near the back of the tank as if the fuel line is too stiff or as if the clunk isn't heavy enough. I made sure the line isn't too long so the clunk is not jammed up against the back of the tank but that didn't help.

Suggestions?

Don't sweat it. The fuel doesn't actually flow to the front of the tank in a dive, at least not in the fairly short dives you get in RC flight. Sounds like your tank is set up correctly.

In fact, having the klunk get stuck at the front of the tank is actually a common problem.

I second that. The clunk doesn't need to fall to the front, in a dive, and in fact, getting a clunk stuck in front is a common problem.

And while we're talking about dives... when you point that nose down, pull the throttle back to idle. You won't need power until your plane is level, again.

Good luck,
Dave Olson

I third that. I just spent 10 hours "tweaking" my engine because it wouldn't stay running. I swore up and down that gremlins were messing with my engine when I wasn't around. Turned out that a rather hard landing caused the clunk to get stuck at the top-front of the tank, causing it to draw air instead of fuel. A slight tap against the tank with my foot ( )got the clunk unstuck.

if you think about it, when somthing is falling at it's terminal velocity,(at its own pace with no engine power) it will have 0 g's, so will everything inside the plane. if you were going strait up, the fuel will beat the back of the tank. When you stall the plane, you then have 0 g's as long as the plane is falling at it's own fall rate (no engine power) the fuel is kinda floating around in the tank, along with the klunk. Most of it will be at the back of the tank, where it was when you were going verticle. Even if you have engine power, going verticly down, you then have a certain amount of g's that will make the fuel stay at the back of the tank. At most times you have a pull from the engine that makes the fuel go to the rear of the tank, like you fall back into the seat when you accellerate fast in a full size car All and all, you more than likely will not have any problems.........please read my feedback to Rubberduck.

MR. Rubberduck, I had that same problem with a trainer, the klunk always got stuck, regardless of a rough landing. What it was was the really junk, trashy, no good fer nothing, crappy ole fuel line they sometimes include with a tank. I used it and had your same problem. I found that if you set-up the klunk like you would any other way with fresh $1.50 per foot pink fuel line, (red, green, blue, yellow, orange, or purple WILL NOT WORK...........girlfreind was with me when I purchased fuel line ) it will work like it should and won't get stuck kinked over and at the top of the tank like yours. Sorry I got sidetracked. ANYWAYS, HOPE THIS HELPS!!!!

P.S. Rubberduck......if you have problems......don't kick yer plane.......give it to me!!!

Joe

Makes sense, thanks guys.