Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0)
Page 21 of 24
Center of Gravity and Control Throws
Balance the plane with the UAT full and the landing gear in the down position. The
recommended C.G. location is 16.25” back from wing leading edge at the wing root chord.
Adjust all linkages and such that the control surface is properly centered at neutral. Elevator,
aileron, and flap servo arm positions and linkages should be mirror images so that the control
surfaces deflect equally at all commanded positions (not just the end points).
The recommended control throws are as follows:
Rudder:
1” left and right measured at the base of the rudder
Ailerons:
3/8” up and down measured at the inboard trailing edge
Elevator:
2” up, 1-1/2” down measure at leading edge root chord
Take Off Flaps:
1” down measured at inboard trailing edge
Landing Flaps:
2” down measured at inboard trailing edge
Elevator trim:
•
For takeoff, elevators should be trimmed with “up elevator” such that the front of the stab
is approximately 3/8” below the molded stab root on the fuselage.
•
No significant pitch re-trim is required with flap deployment. The plane may initially
“balloon” when you lower the flaps to landing depending on the airspeed at the time.
