Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Throttle vibration isolation

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Old 12-03-2009, 02:07 PM
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Wiggy
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Default Throttle vibration isolation

This is how I protect my throttle servos from engine vibration. It has been a long time since I have had a failure. There is a regular 2-56 push rod with a short piece of yellow nyrod at the engine end. I slip a section of fuel tubing over that and put a small screw through the carb horn that goes through the fuel tubing. I have attached pictures but they might not work since this is my first attempt on this forum.

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Old 12-03-2009, 02:46 PM
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Default RE: Throttle vibration isolation

Cool. I've coupled sections of pushrod with fuel tubing before to attempt the same thing.

What's that ball of mucus on the prop hub?

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Old 12-03-2009, 05:43 PM
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Default RE: Throttle vibration isolation

What's that ball of mucus on the prop hub?

He is gluing a broken prop back together and balancing it at the same time.

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Old 12-03-2009, 06:44 PM
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Default RE: Throttle vibration isolation

That is Goop that I use to balance my props. Most APC props are heavy on one side at the hub. Since it would be a very serious mistake to remove material in that area, I add weight until the prop stays in any position on my balancer. I use the Great Planes magnetic variety.

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Old 12-03-2009, 07:27 PM
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Default RE: Throttle vibration isolation

There are very few APC props I found to be off center sideways, thank goodness.

I have a Topflight magnetic balancer and I almost never use it anymore.
I find it excessively sensitive and the plastic cones are not highly concentric to the shaft which defeats the purpose, if I turn the prop on the cones 180*, I can chase the balance indefinitely.

Proper use of the cheap and compact finger tip balancer is plenty good. When you have a super well balanced prop, at a certain point, it become a mute when compared to the out of balanced internals of 99% of the engines we run.
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Old 12-03-2009, 09:11 PM
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Default RE: Throttle vibration isolation

I replaced the plastic cones with metal cones, and ground the shaft points on a drill grinder. I have found a few lopsided hubs, enough to make me do something with them. Mostly on sport props, 9-6, 8-8, 8-9.

Yeah I hear you on the siren call of "perfect balance" - there is only so much precision you can get with $25.00 hobby tools and engines that are not perfect to begin with. Sometimes just turning the prop 180 degrees makes things better as the two counteract each other, or at least don't support each other anymore..

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Old 12-04-2009, 10:14 AM
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Default RE: Throttle vibration isolation

Hi!
!!!!!!![8D]
Balancing that way ...No way!!!!
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