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Other › servo has mind of its own (it's alive)
10-16-2005 11:19 PM  12 years agoPost 1
poletime

rrNovice

vic Australia

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I've installed the CCPM mod and a new battery pac. To run the pack in I was holding the tail boom and spooling up almost to hover revs so that I can draw only a few amps. All of a sudden the RH roll servo is making pulsing rhythmic movements about one per second. I can feel the chopper diving as I hold on. When I increase revs to where it is taking it's own weight the pulsing stops. Reducing the throttle and it comes back.

This is with a QPCM receiver. I swapped it for a PPM micro receiver and it doesn't happen.

Swap it back to the original receiver and it's back

I'm not game to fly with the receiver unless I can find out what is causing this, has anyone ever heard of this before?

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10-17-2005 12:17 AM  12 years agoPost 2
Professor Fate

rrKey Veteran

Goose Creek S.C.

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OK! Here's a stupid question... Did you set your Tx to PCM and vises versa when you swapped out the Rx? Hey anything's possible.

Welcome my son, Welcome to the machine

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10-17-2005 01:06 AM  12 years agoPost 3
poletime

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vic Australia

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fair enough question but yes I did. If the Tx isn't in the right mode I would have no control and the speedie wouldn't arm either.

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10-17-2005 01:50 AM  12 years agoPost 4
Tmaster

rrKey Veteran

TX

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If you dont know, you can't mix and match PCM rx's with different brand TX's.... Hitec is only for hitec and futaba only works with futaba.... etc

Try switching the servos to other channels and see if the same servo acts up or not.

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10-17-2005 02:08 AM  12 years agoPost 5
MikeInMobile

rrElite Veteran

Mobile, Alabama

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Sounds like a bad main shaft bearing ........ A bad bearing will cause this type of thing to happen on a PPM receiver, but it should NEVER happen on a true PCM receiver.

Is your transmitter fully charged?

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10-17-2005 05:47 AM  12 years agoPost 6
poletime

rrNovice

vic Australia

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yeh the trannie is fully charged. Do you mean mainshaft bearing in the servo or in the chopper (causing vibration etc)?

The different brand rx is just a ppm receiver and the QPCM reciever is Hitec that came with the radio. The receiver is to my knowledge all solid state electronics too so it shouldn't get too bothered by vibs. The cheapy is the one that so far is playing the game.

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