Specifications

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❑ Ruler
SECTION 13: BALANCING THE TANGENT EP
YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES:
❑ Pencil
IMPORTANT
It is critical that your airplane be balanced correctly. Improper balance will cause your airplane to lose control and crash!
Center of Gravity Location:
2-7/8" back from the leading edge of the wing, at the fuselage sides.
WARNING
This location is recommended for initial test flying. The C.G. can be moved forward or aft up to 1/4", but it is not
recommended that the C.G. be located any farther back than 3-1/8".
IMPORTANT
As you move the C.G. farther aft, the airplane will become more responsive, especially in pitch. Do not start to move the
C.G. back until you are comfortable with the flight characteristics of the airplane.
☞
Balance the Tangent EP with the flight battery installed.
❑ Measure and draw two marks on the top of the wing, 2-7/8" back from the leading edge, at the fuselage sides.
❑ Turn the airplane upside down, place your fingers on the marks, and carefully lift the airplane. If the nose of the
airplane falls, the airplane is nose heavy. To correct this, move the receiver and/or ESC back far enough to bring the
airplane into balance. If the tail of the airplane falls, the airplane is tail heavy. To correct this, move the receiver and/or ESC
forward enough to bring the airplane into balance. When balanced correctly, the airplane should sit level or slightly nose
down when you lift it up with your fingers at the C.G. location.
☞
Once you have flown and become familiar with the flight characteristics of the airplane, the C.G. can be moved forward
or aft up to 1/4" in each direction to change the flight performance. Moving the C.G. back will cause the airplane to be more
responsive, but less stable. Moving the C.G. forward will cause the airplane to be less responsive, but more stable.
Do not fly the airplane beyond the recommended balance range or an uncontrollable crash could result!
Lateral balancing will make the airplane easier to trim and will make it track straighter in the air. It is highly recommended.
❑ Turn the airplane upside down and tie one length of string to the propeller shaft and one length of string to the tail
wheel wire.
❑ Carefully lift the airplane up by the two pieces of string. Watch how the wing reacts. If one side of the wing drops, that
side is heavier than the other. To correct this, push a small brad or nail into the tip of the lighter wing half.
❑ Lift the airplane up by the pieces of string a couple of more times to double-check your findings. When done properly
the wing should stay level consistently when you lift the airplane up by the pieces of string.
SECTION 14: LATERAL BALANCING THE TANGENT EP