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HomeAircraftHelicopterMain Discussion › Hard Mount Servos On A Nitro Bird, BAD?
06-07-2014 03:10 AM  4 years agoPost 1
icanfly

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ontario

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There are two servos on My Hirobo Shuttle fbl conversion to HV I have that do not come with rubber grommets for the screws that hold them down to a mounting surface. The collective servos are the larger full size hv type seen on all 600/700s. The tail and throttle on the nitro OS are the mid size but not micro. Those are the ones that are hard mounted to the mounting plate without rubber vibe dampers.

What are or is your experience regarding servos on a nitro bird that are mounted with and without mounting damper grommets? Will the motor vibes kill them in no time flat?

All servos on my set up are over the stock rating so there's no need to go into what servo you recommend. Keep it simple.

You know what they say about putting new things on old things, the new things break the old stuff. No worries. I plan to go slow and easy with this one for that reason especially. I could build a TT 600 with many parts I have so non of this is a worry, just worry about the hard mount servos lasting on a nitro heli.

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06-07-2014 04:17 AM  4 years agoPost 2
Mapleleafs

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Ontario, Canada

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it is advised to use rubber grommets.

the motor vibes won't or shouldn't kill a servo but rather the mounting ears overtime will crack and break off, something you do not want happening in flight.

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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06-07-2014 07:27 AM  4 years agoPost 3
JEEPWORLD2002/2

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Blue Bell, Pa

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Yup I ll second broken servo mounting ESP on nitro n gassers. Jr sells new rubbers n bronze screw eyelet things. I was told not to use the bronze eyelet things on my logo but I worried about the screw would work the rubber through the slot ?? So I opted for the eyelets n longer screws but I've seen gasser break the servo mounts on a 620 n 680 blade even with a dual linkage n pivot point like the trex 600 servo set up sorry for the lengthy reply

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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06-07-2014 11:47 AM  4 years agoPost 4
icanfly

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ontario

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If I didn't misplace my sheet of 1/16th rubber (reinforced) then it will make a decent shock mount when folded over the servo ears, even without the grommets or the mounting holes will have to be enlarged.

Not making anything complicated but if you didn't recognize something different here was the use of servos which are SMALLER in physical size yet are STRONGER then older stock form while being a servo that can be DIRECTLY POWERED by battery (2s)

The trend in rc helis is towards a simplified system, almost modular. When I repair the servos on my 300 I leave the mounting portion on only removing the four small pin screws to pull the entire guts out. This allows me to change broken gears and or to swap in another fresh servo of the same model. As I'm doing this I'm keeping in mind the ease of serviceability. If broken ears are the only thing to worry about then thanks, that's a relief, the servos on the shuttle are all aluminum housing.

What's interesting about load on a servo mount are that it is actually twisting radially and side to side as the servo horn rotates. Power up and operate a servo in it's mounting place but not fastened down completely. it will rock back and forth if not screwed down tightly.

Good to know, the smaller servos won't need the screw sleeves and I may only keep one servo on the throttle at the end of the day. I'm leaning toward building a gasser and the shuttle is something to re-acquaint myself with fuelers. Electronic isolation is the key fact of the matter on an rc heli with the electronics so closely located to the vibe monster motor. It's things like ULTRASONIC vibrations that can destroy electronics, vibes not necessarily coming directly from the motor but from it's HARMONICS.

fwiw those mounting plates for the crank arms in my conversion to 120ccpm swash are my own on this hv digital fbl 120deg swash nitro old school new school rc heli. all rights reserved lol. My experience with plastic parts has left me wanting alu, will upgrade or start all over while scavenging the goodies from this one. Practice practice practice.

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06-07-2014 09:19 PM  4 years agoPost 5
meowguy

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Saco, ME

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That little Shuttle brings back some memories. I must have destroyed 25 complete birds learning to fly in the days before simulators. Mine grew from the standard Shuttle, up the ZXXXXX with long boom and complete metal head and full bearing upgrades on every part that rotated. I had rear cone start motor and fantastic WhisperTech muffler. What a nice machine that was. I sold it on eBay about 10 years ago and threw in a box of parts that could have built another one.

Use grommets on your servos.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

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06-07-2014 10:42 PM  4 years agoPost 6
icanfly

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ontario

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to me the rat rod run what you brung mentality is what it's all about, 32 inch rims on a parted together rusty old mish mash of parts resembling in this case a nitro rc heli

found the rubber mat

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06-08-2014 06:25 PM  4 years agoPost 7
ICUR1-2

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Ottawa, Ontario

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been running my 600N for 2 years going on 3 with top front servo's hard mounted.
no issue's yet and no signs of fatigue

spending time, paying attention

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06-09-2014 09:06 PM  4 years agoPost 8
Mapleleafs

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Ontario, Canada

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no issue's yet and no signs of fatigue
probably because you fly like a panzy.....jokes jokes.

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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06-09-2014 10:25 PM  4 years agoPost 9
ICUR1-2

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Ottawa, Ontario

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LOL thanks

spending time, paying attention

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