ORIGINAL: SeamusG
ORIGINAL: Lnewqban
Downthrust is a trick to eliminate or reduce nose up reactions each time the thrust force increases via throttle control.
The idea is to make the thrust line get close or coincide with the location of the CG and the center of drag in the airplane.
This pitch sensitivity to thrust changes is good for trainers and bad for aerobatics.
My LT-40 has a pretty severe climb slope under full throttle. I raised the trailing edge of the wing with some positive results BUT I better understand the issues and will be testing the addition of down thrust. The TE shim will be removed and washers behind the engine mount will be added. The LT starts with 6 degrees and 1 #6 washer adds 2 more degrees.
Do I want to ask the question? Em, yea. How do you determine the center of drag? Some guys at the field think the center of drag is San Franciso so I had to explain that I was talking about the airplane's drag.
Thanks for the info.