Throttle vibration isolation
12-03-2009, 02:07 PM
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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.
Wiggy
Wiggy
12-03-2009, 02:46 PM
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12-03-2009, 05:43 PM
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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.
Ed s
12-03-2009, 06:44 PM
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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.
Wiggy
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12-03-2009, 07:27 PM
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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.
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.
12-03-2009, 09:11 PM
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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..
MJD
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..
MJD
