Instruction manual PIPER J-3 CUB Item code: BH04
37
CG
77mm
BALANCING
1)
It is critical that your airplane be balanced
correctly. Improper balance will cause your plane to
lose control and crash.
THE CENTER OF GRAVITY IS LOCATED 77MM
BACK FROM THE LEADING EDGE OF THE WING.
AT THE FUSELAGE. BALANCEAPLANE UPSIDE
DOWN WITH THE FUEL TANK EMPTY.
2)
Mount the wing to the fuselage. Using a couple of
pieces of masking tape, place them on the top side
of the wing 77mm back from the leading edge, at the
fuselage sides.
3)
Turn the airplane upside down. Place your fingers
on the masking tape and carefully lift the plane.
4)
If the nose of the plane falls, the plane is nose
heavy. To correct this first move the battery pack
further back in the fuselage. If this is not possible or
does not correct it, stick small amounts of lead
weight on the fuselage under the horizontal stabilizer.
If the tail of the plane falls, the plane is tail heavy. To
correct this, move the battery and receiver forward or
if this is not possible, stick weight into the firewall.
When balanced correctly, the airplane should sit level
or slightly nose down when you lift it up with your
fingers.
LATERAL BALANCE
After you have balanced a plane on the C.G.
You should laterally balance it. Doing this will
help the airplane track straighter
1)
Turn the airplane upside down. Attach one loop
of heavy string to the engine crankshaft and one to
the tail wheel wire. With the wings level, carefully
lift the airplane by the string. This may require two
people to make it easier.
1)
We highly recommend setting up a plane using
the control throws listed.
2)
The control throws should be measured at the
widest point of each control surface.
3)
Check to be sure the control surfaces move in
the correct directions.
CONTROL THROWS
Low rate:
8mm
8mm
Aileron control
10mm
10mm
Elevator
30mm
30mm
Rudder control
PRE-FLIGHT CHECK
1)
Completely charge your transmitter and receiver
batteries before your first day of flying.
2)
Check every bolt and every glue joint in your
plane to ensure that everything is tight and well
bonded.
3)
Double check the balance of the airplane.
4)
Check the control surface.
5)
Check the receiver antenna. It should be fully
extended and not coiled up inside the fuselage.
6)
Properly balance the propeller.
2)
If one side of the wing fall, that side is heavier
than the opposite. Add small amounts of lead
weight to the bottom side of the lighter wing half's
wing tip. Follow this procedure until the wing stays
level when you lift the airplane.
High rate:
Aileron:
8 mm up 8 mm down
Elevator:
10mm up 10mm down
Rudder:
30mm right 30 mm left
Aileron:
14 mm up 14 mm down
Elevator:
14mm up 14mm down
Rudder:
40mm right 40 mm left