Hard Mounting Servos - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-06-2013, 09:38 PM   #1
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Hard Mounting Servos

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Recently I have bought an e-heli that had the Futaba 451s servos hard mounted to the main frame. Two 600-size helis I examined today at a FF also had servos mounted without their grommets.

One would think this practice would shorten the life of the servos due to vibration over hundreds of flights.


July 11th

I asked a manufacturer. Their tech support stated that in a lower vibration environment of an eHeli, hard mounting would be acceptable.

July 19th
Dave Youngblood attached an acceleromitor (sp?) to their 60 size nitro and they found that the majority of the vibration was from the engine of a well balanced heli.

Last edited by tskca; 07-19-2013 at 08:46 AM.
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Old 07-06-2013, 11:12 PM   #2
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Re: Hard Mounting Servos

I'd say completely irrelevant. Hard mount or using the rubber grommets I believe has zero influence on how long a servo lasts.
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Old 07-06-2013, 11:23 PM   #3
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Re: Hard Mounting Servos

I don't think so. With todays modern electronics all having surface mount components and little actual wiring to vibrate around, the risk of failure due to vibration is minimal. Sure, my gasser has the rubber grommets, but really, by the time you put in the brass eyelets and tighten down the screws, those servos are sitting pretty darn snug and engine vibes are still getting to the servos. There's no way to truly 100% isolate them. Electrics are naturally a much smoother running machine, so I would imagine the vibes transferred to a hard mounted servo are less than the vibes on my gasser with rubber grommet isolated servos.
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My Heli: Futaba 18MZ 2x(JR GSR260Z Sports FBL, Zenoah G26H, Futaba CGY750 Gyro, Futaba BLS-351 cyclic, BLS-251 tail, Futaba BLS-451 Throttle. Gryphon voltage regulator).
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