Section 21: Balancing The Magic Formula 3D Arf; Section 22: Lateral Balancing The Magic Formula 3D Arf - Model Tech Magic Formula 3D ARF Manual

SECTION 21: BALANCING THE MAGIC FORMULA 3D ARF

# 2 Phillips Screwdriver
Ruler
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:
4-1/2" - 5-1/2" (114mm-140mm) back from the leading edge of the wing, measured at the fuselage sides.
WARNING This is the recommended C/G range. FOR TEST-FLYING WE SUGGEST YOU START WITH THE C/G AT 4-1/2"
(114mm), then move it farther back as you become familiar with the flying characteristics of the airplane. It is not recommended
that the C/G be located any farther back than 5-1/2" (140mm).
IMPORTANT Balance the Magic Formula 3D ARF with the fuel tank empty and the airplane fully assembled.
Install the wing onto the fuselage.
Apply two short pieces of masking tape onto the top of the wing, 4-1/2" (114mm) back from the leading edge, measured at
the fuselage sides.
Turn the airplane upside down, place your fingers on the masking tape, and carefully lift the airplane. If the nose of the airplane
falls, the airplane is nose heavy. To correct this, move the battery pack and/or receiver 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 battery pack and/or receiver forward far
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 fore or aft within
the C/G range 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 more stable, but less responsive.
DO NOT FLY THE AIRPLANE BEYOND THE RECOMMENDED BALANCE RANGE OR AN

SECTION 22: LATERAL BALANCING THE MAGIC FORMULA 3D ARF

Lateral balancing will make the airplane's controls easier to trim and will make the airplane track straighter in the air. It is
strongly recommended.
Turn the airplane upside down and tie one length of string to the propeller shaft and one length of string to the tail skid.
With someone helping you, 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 condition, stick a small piece of self-adhesive lead weight to the
bottom of the lighter wing half (the one that doesn't drop).
IMPORTANT For best mechanical advantage, place the weight as close to the wing tip as possible.
WARNING Make sure to apply the lead weight to a solid portion of the wing structure so that it can't rip off during flight.
Repeat the procedure a couple of more times to double-check your findings. When done properly the wing should stay level
when you lift the airplane.
YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES:
UNCONTROLLABLE CRASH COULD RESULT!
Masking Tape
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