Originally Posted by
Jack_K
The plane is trimmed to fly straight and level. However, the elevator required a large amount of up in order to accomplish level flight. I'm wondering why it needs so much up to fly level.
The engine appears to have no positive or negative offset. The plane is balanced according to the plans. There seems to be no incidence difference between the horizontal stab and the flat bottom wing.
So, why does it require so much up trim?
You asked:
What airplane? Fuselage from one and a wing from another
What radio? Why would that matter? DX9 and AR400
What servos? Why would that matter? Hitec HS325HB
What kind of linkage and clevis's? Same old stuff
Everything matters. Small electrics have no threaded clevis's so a reset involves bending the control rod.
Airplanes matter because some planes require built in incidences.
Radios matter because the way to center the trim is different brand and model one to another.
Servos matter because some small electrics are not rotational with removable horns that could be mechanically change for trim.
Now, what do you mean " Fuselage from one and wing from another" same plane and brand ARF?
After a maiden flight I land and look at the elevator not the number in the transmitter. Next flight I pull a 45* up line and go inverted then hands off to see where my CG is (note this is after trimming for hands off level flight). If I'm nose heavy the plane will quickly curve downward. If tail heavy it will curve upward. Learning what CG suits you is something important but personal. I prefer a CG a little biased toward the back ( I want to not have to make a quick down elevator push when inverted).