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My Servos have a mind of their own !!

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Old 08-24-2003, 01:18 PM
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Dez[Uk]
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Default My Servos have a mind of their own !!

Hi

My car (HPI RS4) has been playing up recently. I am using a Futaba Attack 2ch radio with Futaba S3003 servos on the throttle/brake and steering linkage. The radio is running on 40MHz crystals. But recently i will be driving along and the servos will just do what ever the hell they want, like steer into a kerb or the throttle will just open up. Sometimes i cant control them at all and they just sit there doing nothing. This is just a new thing that has started happening and its really annoying. I run my car by myself in a car park so it isnt crystal interference and i have tried different locations but it happens everywhere.

Anyone got any ideas ?


I have a JS XR3 on its way from USA so hopefully that will arrive soon and solve this but in the meantime i want to use my car.
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Old 08-24-2003, 04:56 PM
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Dez[Uk]
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Default My Servos have a mind of their own !!

this twitching of servos only happens when my engine is running

Does that give any clues ?
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Old 08-24-2003, 07:28 PM
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strato911
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Default My Servos have a mind of their own !!

Originally posted by Dez[Uk]
this twitching of servos only happens when my engine is running
Electric, Gasoline, or Glow?

If it's electric, the motor may be sparking, resulting in RF interference.

If it's gasoline, the ignition system may be generating RF for various reasons...

Both Glow and Gasoline engines will cause vibrations, and if there's metal-on-metal connections anywhere that aren't tight enough, they will cause RF interference.

There's more possible causes, but my expertise is based on glow and gas powered aircraft.
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