Center Of Gravity; Control Surface Deflections And Expo Settings - BVM Grumman F-9F Cougar Construction And Operating Manual

Center of Gravity

 Measure aft of the Leading Edge (LE) at the wing/fuse joint 9.25". Drill a 1/16" hole in the
fuselage skin 1/4" inboard from the wing root and install a #2 button head screw on each
side. This location is very forgiving; there is no need to move it forward.
Balance the model fully assembled, empty fuel tanks, gear down, and a full UAT. With
the correct CG, the model should balance level.

Control Surface Deflections and Expo Settings

Control
Elevator (measured at the
Root)
Aileron (measured at the
Ail/Flap Junction)
Rudder (measured at the
Bottom of the top rudder)
Control
Flaps
Body Flaps
Elevator Mix with flaps
Speed Brake
Note: The BVM Demo plane is setup using the above Expo percentages. Positive values are
used on Spektrum and JR radios, Futaba uses negative.
 The body flap measurement is made from
the furthest aft point.
BVM ®2015
High
Expo
Rate
Up 1" Up 7%
Down 1" Down 7%
Up 1-7/16"
12% / 12%
Down 1-1/8"
+/- 1-1/8" 10% / 10%
Take-Off Landing
Position Position
1/2" 7/8"
1-7/8" 3-3/4"
1/8" Up 3/16" Up
Mid Full
Position Position
1-1/2" 3"
Medium
Expo
Rate
Up 4%
Up 15/16"
Down
Down 15/16"
4%
Up 1-1/4"
5% / 5%
Down 1-1/16"
measured at the Ail/Flap Junction
See Photo Below
measured at the Root
Measured at the outside corner
39
Low
Expo
Rate
Up 7/8" Up 2%
Down 7/8" Down 2%
Up 1-1/8"
3% / 3%
Down 1"
Printed 7/3/2019