micro servo for throtle control

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Howard Denison - 26 Sep 2005 22:54 GMT

Will this work?
tia

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Doug McLaren - 26 Sep 2005 23:46 GMT

| Will this work?

On an Norvell 0.061? Almost certainly.
On a 3 ci gasoline engine? Probably not.

More information is going to be required ...

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Doug McLaren, dougmc@frenzy.com
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respect for humanity. That's how rich I want to be. --Rita Rudner

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Fubar of The HillPeople - 27 Sep 2005 00:14 GMT

I am using Hitec HS-81's for the throttles on my Twinstar. Saito .30
engines. Dont think I would use em on anything much bigger. Would probably
work, but a waste of micro gear in my opinion.

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Dan
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> Will this work?
> tia

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Mark Miller - 27 Sep 2005 02:09 GMT

> Will this work?
> tia

I'll concur with the others that it depends on how big an engine you're
controlling, and how big a micro servo. Nowadays, "micro" means anything
between about 4 and 20 gm.

My throttle servo of choice is actually a Hitec HS81 MG, which is at the
large end of the 'micro' scale. I've had trouble with nylon-gear throttle
servos eventually stripping. This makes for a very long flight, if it
happens when you're at about half-throttle on floater with an oversized
tank.

Never had trouble with metal-gear servos for throttle, though. I've been
using them for my .46's.

Make sure your throttle linkage works easily, of course - a micro will have
more trouble handling a draggy linkage.

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"Is there such thing as too much of a bad thing?" - Tripping the Rift

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Six_O'Clock_High - 27 Sep 2005 16:30 GMT

>> Will this work?
>> tia
[quoted text clipped - 15 lines]
> have
> more trouble handling a draggy linkage.

There are two reasons folks don't use that size servo on gas burners. The
first is that the ignition systems splatter near by radio equipment, so
there is a need for a long throttle actuating mechanism. The second reason
is the long actuating system.

I might have the solution to that problem and in short order will be
mounting an HS81 up next to my 2.7 inch gas burner. That will help control
the throttle and contribute to the shift in CG I want. Yes, there is a
trick and I will have it available by Christmas.

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Model Forum / Radio Controlled / Air Models / September 2005

micro servo for throtle control