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HomeAircraftHelicopterHelicopter Main Discussion › I keep on destroying throttle servos
04-24-2009 06:04 PM  9 years agoPost 21

rrElite Veteran

Deer Park WA

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3 cheep servos dieing in 3 months says there is still something else wrong! even a great servo will fail if there is binding or some other issue. he needs to find the problem causing this first and then I agree buy a good servo.

Spectra-G, Ion X-2

04-24-2009 06:13 PM  9 years agoPost 22


Houston, Texas

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I use Hyperion DS20 GMDs (tail servo version) on my throttles.
High speed high torque double ball bearing metal gear digitals full size servos.. and they are only 40 bucks a pop.
I have used the Hyperion servos and they are amazing for the price/performance you get out of them. I did have a throttle servo bind once, not because of length or throw, but because the link was slightly bent and the link end was melting on the muffler. Check ALL your clearances not just your end travel points.

*** Real Pilots BEAT the air into submission! ***

04-24-2009 06:36 PM  9 years agoPost 23

rrKey Veteran

Round Rock, Texas

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I will definitely check for binding. I checked end points last servo and all seemed well. I still had travel above and below where the carb was fully open and closed. I DIDN'T check for any excess vibration though. The heli is pretty rock solid during flight so I will look a bit closer.

I have decided to go with the 9252 for the throttle. I have 2 extras that I will try!!

04-24-2009 06:44 PM  9 years agoPost 24
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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On the binding issue. Try set the travel to 99% of the carb travel. At 100% any flexing will cause binding.

In 7 years of heli flying, i have only had one throttle servo (9252) get a bad pot and hunt about.

I have now switched to JR 285's (plastic gears) on my last 2 helis. They have been fantastic. Before that 9252's were the choice.


04-24-2009 11:12 PM  9 years agoPost 25

rrElite Veteran

Tacoma, WA

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Regarding binding and proper linkage setup:

Regarding digital mode, consider running plain old analog mode. Throttle servos are worked more than we think, and digital mode can be more demanding.
Next question is what servo will serve me well? I don't want to spend $80.00 on a throttle servo so what do I need?
In general full size servo's will do fine, but expect to pay upwards to $50+. However my Hitech HS85MG micro servo is really performing well in analog mode with regulated 6V through an Aerospire Multigov. I've had about 200+ flights on it and there's no hesitation in performance on my OS50 Hyper engine.

If you are questioning too high of voltage, install a voltage step-down in between the servo wire and gov/limiter. Good luck.

_Sam B_

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HomeAircraftHelicopterHelicopter Main Discussion › I keep on destroying throttle servos
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