nearmissbt

I believe 0-0-0 is the correct thrust line in most planes. I wonder if a 3 degree or so down thrust would solve a fast climb rate at full throttle on a sport craft with full symetrical horz. stab and main wing? I really hate to crank in lots of Down Elev. to correct a climb. [sm=spinnyeyes.gif]

Geistware

My Feedback: (16)

Yes, if the plane climbs at fill throttle, then down thrust will address that.

Kenny R

Sounds more like an incidence problem instead of engine thrust. If you put down thrust I think you may just be "crutching" the real problem.

J_R

I agree with Kenny R

Take the plane up high and put it into a throttle off vertical dive. Watch to see if the plane continues straight down. If it does not it is time to adjust the incidence. If it does, then go on to changing the thrust. Do the check several times in dead air and make sure before making any adjustments.

nearmissbt

Thank you folks for the suggestions! Will check the incidence again and then move on to the thrust adjustments if necessary ![/size]

Mike James

A pattern-type trimming chart, like this one available from the NSRCA (free) may help you zero in on the problem:
http://www.nsrca.org/trimA.htm

Ed Smith

Think in terms of "Incidences" there are three that should be checked.

Ed S

FHHuber

Don't forget the possibility that its a CG problem being corrected with a couple of clicks of up-trim.... If the CG is forward, you need less up-trim to correct for it as the aircraft gains speed. Thus as you add throttle the nose goes up.