Specifications
30.10.6. Main rotor blades
If the main rotor blades appear damaged do NOT fly with them. They can explode in flight
which is very dangerous. You should replace any blades which appear damaged.
30.10.7. Ball links
Ball links (especially above the swashplate) will wear out and require replacement as they be-
come loose.
30.10.8. Servo wear
Servos may start to jitter as they wear. This may be caused by two problems:
• Worn potentiometer. This requires the servo to be replaced or sent to the manufacturer for
repair.
• Chipped gear teeth. This can be fixed by replacing the servo gear set.
30.10.9. Ball bearings
Ball bearings should be checked periodically for wear.
• Insert a shaft through the ball bearing and push on the shaft at right angles to the bearing
while rotating the shaft. If the bearing does not rotate smoothly (feels "notchy"), then it
should be replaced.
30.10.10. Corona specific maintenance
• If you have a boom strike, the tail boom can be straightened by pushing a 3/8" dowel
through the tail boom.
• If you let the Corona come down too fast it may "bounce" off the ground and break a main
gear tooth and/or trash a bearing. So, the main gear should be checked periodically for
missing teeth and the main rotor shaft bearings should be checked for smoothness.
• Be sure to check HS-81s for broken gear teeth after each hard crash. They may rotate
properly through the whole rotation, but they may have a broken tooth somewhere.
I consider the HS-81 gears a "sacrificial" part...they break to prevent other things from be-
ing broken, and at $3-$5 a set they are fairly cheap.
30.10.11. Piccolo specific maintenance
• There isn't much maintenance required on a Piccolo. The stock brushed motor (the 280 or
310) should last 300 flights or more without maintenance if properly broken-in.
• If the antirotation pin breaks off the swashplate but the stub is left, then it can be fixed with
a small nylon tiewrap. Cut the tip from the tie-wrap and lash it the remnants of the antirota-
tion pin by using several loops of cotton thread. After tying, put a drop of thin CA on the
thread to harden it.
Technical Appendix
211