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Old 04-30-2004 | 06:11 PM
  #6  
siclick33
 
Joined: Dec 2003
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From: York, UNITED KINGDOM
Default RE: Servo selection warning

I understand there is a difference in the design of the 3003, 3004 that makes them more affected by vibration (something to do with the direct link to the potentiometer). The 3001 and 148 are different and should be fine.

This is a quote from the Futaba website

Both the S3003 and S3004 use a direct drive potentiometer. What that means is the output gear is connected directly to the potentiometer. Since the output gear is connected directly to the pot it is very possible that vibration will damage the pot. This is why we do not recommend these servos to be used in helis. Helis generate a very high frequency vibration due to the high rpm of the engine and the close proximity of the engine to the servos.

As an aside I had two JR 591 failures caused by vibration on my heli. It turns out that the web on mounting lugs was touching the frame. This was enough to pass the vibration to the servo motor and destroy it. Make sure that your servos are mounted on vibration mounts and that no part of the servo case touches the frame. The results of not doing this are not funny!