Hangar 9 SU-26MM Sukhoi Assembly Manual page 10

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5. Attach an 18-inch JR Heavy-Duty extension to the
middle servo. Mount the servo such that the output shaft is
towards the leading edge of the wing.

6. 1.5-inch servo arms are used for 3D wing setup.
Assemble the linkages and use threadlock on all the screws.
Setscrews need only tightening and no threadlock.

7. The picture below shows the wing with a 3-servo setup
at full deflection. For MatchBox setup, refer to previous
section.
The picture below shows the comparison of precision
wing and 3D wing setup.
Hangar 9 3.1m Sukhoi SU-26MM ARF Assembly Manual