ORIGINAL: Larry Legg
Can this be achieved by adding downward thrust to the engine?
Not sure what it is that you want to accomplish. Generally a good way to check if the engine needs up or down thrust is to trim the plane for hands off level flight at moderate speed. If the plane tends to pitch up with full throttle, it could be a CG issue, an engine thrust angle issue, a positive AOA issue, a stabilizer issue, etc............ If the plane stays level at varied speeds, take it straight up vertical at full throttle and see if wants to pitch. If it pitches, go staight down with the throttle chopped and see if it pitches. If you have pitching problems with vertical flight but not horizontal flight, it's usually an indication of incorrect engine thrust angle,
usually. Add to the mix of things that this plane has a semi-symmetrical wing (some call it flat bottom) and a flat bottom airfoil for a stabilizer. This complicates things as far as fine tuning the flight performance. All this can make it tough to figure out exactly what needs tweaking.
