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Proper tail drive belt tension plays a critical role in achieving maximum performance and reliability of your
model. If the belt tension is set too tight, power can be lost while also causing the belt and/or pulleys to
wear more quickly. If the belt tension is set too loose, the belt can skip and strip teeth from the belt and
pulleys, while also potentially causing a loss in tail power and control in flight.
16.1 Position the helicopter to view the tail drive belt and forward drive pulley from above.
Standard Belt Tension Guide:
Visualize a straight line through the center of
the forward tail drive pulley. You should be
able to apply light tension to the belt with
your finger until it reaches a point 3/4 of the
way to the opposite side of the belt, or 1/4 of
the way past the virtual center of the forward
tail drive pulley.
16.2 Using your finger, apply light tension to one side of the belt, compressing it toward the other side.
Proper belt tension is achieved if the belt reaches ¾ of the way to the opposite side of the belt.
If you find that the side of the belt you’re lightly compressing can touch the opposite side of the belt,
the tension it set too loose. If you find that the side of the belt you’re lightly compressing does not
reach 3/4 of the way to the opposite side of the belt, the tension is set too tight.
16.3 Belt tension can be adjusted by first loosening the eight screws that attach the tail boom holder
to the main frame, then sliding the boom in (to loosen belt tension) or out (to tighten belt tension)
accordingly. After adjusting the position of the tail boom to provide the proper tail drive belt
tension, be sure to retighten all eight screws (carefully to prevent stripping) to hold the boom
securely in place.
16.0 Setting Tail Rotor Drive Belt Tension
Summary of Contents for T-REX 450SA ARF
Page 70: ...70 Building Notes ...
Page 71: ...71 Flying Notes ...
