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  #1  
Old 06-07-2019, 11:18 PM
T.O.Craig T.O.Craig is offline
 
Join Date: Feb 2006
Posts: 166
Default Front tire shimmy

Gentelmen,
Did our first taxi test today hoping for our first flight. Shimmy on the front wheel was excessive. After reviewing the plans, I have to revisit the tightening of the fork to 26 pounds of resistance on the front axle. I don't know that I did that when first installed 4 years ago. How do we accomplish that pull? Fish scale is the only thing that comes to mind...
Thoughts from the brain trust are always greatly appreciated
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  #2  
Old 06-07-2019, 11:46 PM
arffguy arffguy is offline
 
Join Date: Jan 2005
Location: Elk Grove, CA
Posts: 421
Default

In my RV-7 manual this is covered in the manual section 10, named Landing Gear under the title "Setting the Breakout Force of the Nosewheel." I don't know what RV-10 manuals have. But it does say "fish scale." Good luck. I'm sure other folks can give you more details.
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  #3  
Old 06-08-2019, 06:27 AM
plehrke's Avatar
plehrke plehrke is offline
 
Join Date: Sep 2006
Location: Defiance, MO
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Default

Quote:
Originally Posted by T.O.Craig View Post
I don't know that I did that when first installed 4 years ago. How do we accomplish that pull? Fish scale is the only thing that comes to mind...
Thoughts from the brain trust are always greatly appreciated
I have used fish scale as well as an expensive tension/compression meter. Currently using a $10 luggage scale. Key is something that shows breakout force or max force as once moving the force drops. Spring fish scales don?t but many digital luggage scales have a hold function to show max force.
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  #4  
Old 06-08-2019, 08:26 AM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,251
Default

Get the right nose axle nut tension, but then work the other issues, such as:
- Get the replacement axle where you can dial in the bearing tension: http://www.matcomfg.com/AXLEASSEMBLY...dv-3657-1.html
This also eliminates the nose gear fork wear problem.
- Balance the nose wheel.
- More important, balance the main gear.

Carl
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  #5  
Old 06-08-2019, 09:43 PM
T.O.Craig T.O.Craig is offline
 
Join Date: Feb 2006
Posts: 166
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Thanks to the group for all the help.. I'll give it a try next week
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Craig Rufi
FLYING NOW AFTER 13+ YEARS. NICE FLYING AIRCRAFT!!
RV-10/Empennage/Wings/QB Fuselage/Wiring/Doors done finally, Cowling done. Stein panel complete, and connecting all those wires :-))Thousand Oaks, Ca. Dues paid for 2019
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  #6  
Old 06-09-2019, 05:39 AM
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larrynew larrynew is offline
 
Join Date: Oct 2007
Location: In New Braunfels, ist das Leben schön!
Posts: 919
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I use a fish scale just like the plans show. Works great. I have two, a 50lb Rapala from Amazon and 30lb antique brass Chatillon from eBay. Measure within a pound of each other.
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  #7  
Old 06-09-2019, 04:21 PM
Ezburton Ezburton is offline
 
Join Date: May 2017
Location: MD
Posts: 105
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I recently had a bad shimmy happen on landing after I installed the wheel pant on the nose gear (in a Velocity... which are known for bad ground steering and NLG shimmy). It was suggested that I check the wheel balance.

The tire was new and the heavy spot aligned across from the stem. The wheel itself needed no balancing, the tube is what it is, but as soon as I installed the new Michelin tire I found I had to add 110gm of balance weight.

The result was the shimmy disappeared with and out the fairing. If your installation is new, you should check the balance if you didn't do it when you built up the assembly.

Harbor freight sells a cheap motorcycle wheel balancer that worked fine for this.

Good luck
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  #8  
Old 06-10-2019, 08:40 AM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Fl/Ga
Posts: 766
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Van’s (also Cirrus) have a bulletin re: reducing nose shimmy. The recommendation is to reduce tire pressure. Had the same issue with the recommended tire pressure. I reduced my nose about 4-5 pounds under and the mains a couple and it solved the problem. It just puts more tire surface on the ground.
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  #9  
Old 06-10-2019, 06:48 PM
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ScottSchmidt ScottSchmidt is offline
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Join Date: Dec 2005
Location: Salt Lake City, Utah
Posts: 1,171
Default May be the mains

There has been lots of threads on this but wanted to make sure it is the nose gear. In most cases on the -10 it is the mains that shake around 24-30mph. One way to make sure is to fly early or late with big shadows. If it is the nose gear that is an easy fix, the mains are not so easy.
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