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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Gas Engines and High Speed Throttle Servos
01-13-2013 01:13 PM  7 years ago
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James Kovach

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canton, oh - US

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Gas Engines and High Speed Throttle Servos
Something I discovered quit sometime ago and seems to be surfacing again is that gas heli engines, govs/revlimiters and high speed servos do not play well together. It causes a number of issues... Gov hunting being one of them. These engines simply cannot react quick enough to fast throttle changes. I have found servos with transit time around .25 work the best.

If you wish to use a fast throttle servo, you will need to slow it down mechanically, thru the gov software or both. You milage will vary though.

But hey.... Who am I. I will again turn this section back over to the "experts"

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
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01-13-2013 03:12 PM  7 years ago
Carey Shurley

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Orlando, FL - USA

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however we aren't that far away from folks running HV servos all the way around for simplicity. Last I checked they weren't making slow HV servos.....

also with the higher engine/head speeds the models are running now, there's less need for the differential throttle setups as the curves are closer to being linear than they used to be

to you point though as with every setup, every part of the power system is important and will affect the overall settings/results. Because it works perfectly for me in my setup doesn't mean it works for everybody because of all the variables.

James sounds like you've fine tuned the right combination to work perfectly with your setup!
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01-13-2013 05:26 PM  7 years ago
traderdave2

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Covington, GA

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I have a pretty slow HV servo on my throttle. .17 sec on a 2s lipo. Pretty good price ($40) for a metal gear, HV digital servo. It is not coreless, so I wonder if it is hurting my gov performance.

Futaba HV3051

Thanks,
Harlan
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01-13-2013 05:44 PM  7 years ago
Mr.HillBilly

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Salesville, OH - USA

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I have been running the same servo since a little before IRCHA last year. Holding up great.
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01-13-2013 06:20 PM  7 years ago
James Kovach

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canton, oh - US

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kinda missed my point Carey. these engines do not benefit from a fast servo... In fact it hurts the performance. That does not mean you cannot use faster servos. Just means if you do you will likely need to compensate for the higher speed mechanically ( moving the ball in as you suggested in you build thread) or via the governor if you are using one.... Or both.*disclaimer: These are my opinions. Agree or disagree, Your Call :)
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01-13-2013 08:58 PM  7 years ago
Carey Shurley

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Orlando, FL - USA

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hey James, no I got it.

you're exactly right, the servos are getting faster, the HV servos are all fast. As folks move to all HV setups to avoid regulators and other such non essential stuff the setups need to accomodate quick servos
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01-14-2013 05:41 PM  7 years ago
James Kovach

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canton, oh - US

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Cool. Wasn't sure from your previous post.*disclaimer: These are my opinions. Agree or disagree, Your Call :)
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