GREAT PLANES AccuPoint Manuel d'instruction - Page 9
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Checking Engine Thrust
The engine thrust line is critical. If the angle is too high, the nose of the plane will drop
when reducing the power for landing. If it is too low, the plane will balloon up when the
power is reduced. Ideally the thrust angle should be set so there is little to no trim
change from 1/3 to full throttle.
Right thrust is added in many airplanes to counteract the torque effect of the propeller
wash cork screwing around the fuselage. The side thrust should be adjusted so that
the plane tracks straight with the rudder trimmed as close to neutral as possible. Most
manufacturers set this angle so the plane will track straight during upline maneuvers
(stall turns, etc...). Again, check the plan sheet for the recommended specification.
1. Remove the spinner and prop from the front of the engine.
2. Calibrate the meter to 0° on the stabilizer. If checking the side thrust, rotate the fuse-
lage to the side and calibrate the meter on the fin.
3. Bolt the meter to the engine and record the angle. Note: The weight of the meter
may alter the results as gravity tries to pull it down. Try supporting the end of the meter
until you are confident you are getting accurate results.
4. Adjust the thrust angle by adding flat washers between the engine mount and the
firewall. Note: It is best to perform this check before the cowl is mounted as any
changes now will result in a misalignment of the spinner-to-cowl fit.
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