Hi Bob,

 Please fill me in on the following:

What fuel?  What metering orifice?   Any baffles in your fuel tank?  Is starting quick and easy, or is there a lot of popping?

Will Stewart

Bob,

Gasoline has a narrow flammibility range.  The gasoline of today is often spiked with ethanol or MTBE or whatever which would require a slightly larger metering jet than the #4 you probably have installed.

I would try Coleman fuel (like used in camp lanterns and stoves).  There may also be corrosion in the brass metering orifice which would reduce the ID and roughen it, reducing flow.  I'd try to ream the orifice, without removing any metal.  If it still cuts, try enlarging the orfice by a couple of thou.

As an alternative, methanol with 20% nitromethane and a metering jet drilled to 0.055-inch ID should get you into the air.  Flo-jector holes might have to be enlarged slightly with this fuel.  Make sure that the holes in the flo-jector are top and bottom.  Alcohol fuel (Followed by a light spray of WD-40 on the reed after flying) should let the reed last indefinitely.  With gasoline, reed life is considerably shorter.

Good luck,   Will

Thanks guys, when we get a chance we'll try some of the suggestions..

Bill, tank is pretty much stock except with larger tubing and no baffles. Speed isn't changing that much from just before liftoff to liftoff. Wouldn't think CF is a big factor but who knows, I sure don't.

Just my 2 cents worth it sound like a tank vent issue..   how is the vent placed in the tank???

Robert Bolton

the vent should be aft = 45 degress down aft.
Not into the wind, can't tell by the photo.

Patrick

Vent is pointed into the wind (forward).. Could this be causing it to go too rich on take off?

Ok  guys lets look at the picture its an upright .. The vent should face forward however if the vent is too large it will flood out .. If you could tell me what the pick up and vent sizes are I can figure  this out .. Yes I agree Colemans is the better way to go.., Jet Bill