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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › 9251 servo acting strange
07-24-2006 04:13 AM  14 years ago
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lakespinner2

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north carolina

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9251 servo acting strange
I have a GY601/9251 servo on the tail of a Titan raptor 50. I bought the gyro/servo used and I've put about 50 flights on it since I've had it and it is still working great, no crashes since I've had it.

The thing is, that now the servo horn is very hard to turn by hand when the servo is not powered up. Initially, when I first got it I could spin the servo horn with the power off VERY easily, with almost no friction. Now it's very stiff and hard to turn by hand; but it still flies just fine amazingly enough.

I have a gasser with the same servo so I checked it and it's very easy to turn the servo horn on it with the power off.

I'm wondering if this is a sign of impending doom, if it's worn out, etc. ?

I took the servo apart and all the gears seem ok, nothing wrong with it that's obvious. I put it back together and it's still very stiff and hard to turn.

Is this how they tend to wear out or degrade ?

thanks.
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07-24-2006 06:36 AM  14 years ago
DOKEY

rrProfessor

Northamptonshire UK

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Could be the sign like others have documented on here before, that the servo is on its way out Ryan.
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07-24-2006 08:04 AM  14 years ago
Vigor3DFX

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Oakthorpe, Midlands, UK.

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Thats a classic sign of a motor failing,

I had a 9251 and a 8700G do that

That will fail soon, sorry.

Funny though, the 8700 was on the tail of a rap 50,
service center said "ah, the raptor rash"
excessive vibration..

turns out i need to trim the mounting lug underside a little
to stop it touching the servo mount, (picking up vibration)
Just thought it worth mentioning as it may happen again with
your replacment servo.
Tony
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07-24-2006 08:20 AM  14 years ago
RockDoc

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Middlesbrough, England

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As DOKEY says it's on it's way out. I've had a few of these types failures on my Raptor 50 9251 servos and on opening them up they were full of oil in the motor. Tried cleaning them to no avail. I no longer have it boom mounted and have not had a problem since...

D.
Sponsored by Barclaycard!

www.clevelandheli.co.uk
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07-24-2006 01:21 PM  14 years ago
lakespinner2

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north carolina

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Sounds like it's time for a new 9251. And I do have it boom/tail mounted on the Titan. I've been thinking of tossing the push-pull setup and moving the servo back under the canopy.

And to make matters worse, the fuel tank does have the balls of foam that no one seems to have an answer for. Perhaps whatever vibration is causing the balls of foam aren't helping the tail mounted servo either.

Thanks for the help.
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07-24-2006 01:56 PM  14 years ago
TMoore

rrMaster

Cookeville, TN

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The Titan is the dumbest idea I've heard of in years. Make the collective push/pull, add a bellcrank to the mix and move the tail servo to the boom area but mount it on the frames so that everytime you adjust the tail belt, you still have to trim the tail pushrod. Oh yeah, that's just brilliant. The tail servo was in the right place to start with and for this you pay more.

Does that sound like an upgrade?

Everyone is right, the motor is going t*ts up.

TM
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07-24-2006 07:33 PM  14 years ago
mcoccia

rrKey Veteran

Central Jersey

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The tail servo was in the right place to start with and for this you pay more
And your getting less! They do not even include the carbon base plate.
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07-25-2006 10:10 AM  14 years ago
RockDoc

rrApprentice

Middlesbrough, England

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You dont even get the carbon base plate ?!?! Does it come in a box - LOL. Blimey, you might as well buy a 50SE and just get the longer boom, belt and main/pinion gears. Or just get a standard R50 and upgrade the bits you want.

D.
Sponsored by Barclaycard!

www.clevelandheli.co.uk
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07-25-2006 12:21 PM  14 years ago
Yug

rrMaster

UK. Herts

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RockDoc - balls of foam, sure it's not engine/fan/clutch balance ?

One of my boom mounted tail servos is about to be replaced so it's going back under the canopy with a carbon linkage. I do often check for oil in the servos but it's not yet got as far as the motor. I suppose I'm not spending enough time inverted
Vegetable rights and Peace
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07-25-2006 07:35 PM  14 years ago
lakespinner2

rrVeteran

north carolina

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I can't help but think that if the fuel tank is generating balls of foam the boom mount that the servo is attached to, which is right at the fuel tank, must be vibrating too.

I should have a new 9251 here in a couple of days. I think I'll put it up front this time and take all the Titan push pull stuff off and go back to the 'normal' method.

The elevator push-pull works ok but with a normal size servo horn, the 2 links bind pretty bad as it rotates, and when a larger servo wheel is used, to get the links running parallel so they don't bind as it turns, I have to turn the elevator ATV WAY down, too far down. I think they could have done a little better with the elevator geometry.
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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › 9251 servo acting strange
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