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Old 02-02-2019, 04:16 PM
tman512 tman512 is offline
Join Date: Oct 2011
Location: Surprise, AZ
Posts: 3
Default Nose wheel breakout force

My RV6A nose wheel will not maintain the 22 lbs. of breakout force. Will replacing the U-611 disk springs correct this problem? My plane has logged 925 hours.
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Old 02-02-2019, 06:43 PM
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AlexPeterson AlexPeterson is offline
Join Date: Sep 2005
Location: Maple Grove, MN
Posts: 2,166

Check post #10 of this thread.
Alex Peterson
RV6A N66AP 1600+ hours
Maple Grove, MN
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Old 02-02-2019, 09:59 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 4,010

I would disassemble, clean, remove any burrs from belleville washers, regrease and reassemble. Others have had good success by dressing the edges of the belleville's that contact each other.

RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress
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Old 02-03-2019, 05:41 PM
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woodmanrog woodmanrog is offline
Join Date: May 2005
Location: Florida
Posts: 767

You may have to tighten the bolt past the present cotter pin holes, torque to 23-25 lbs of breakout force and drill new holes for the cotter pin. For what it's worth, do not put any grease on the Bellvile washers. Lubes defeat their purpose. This is mentioned in the plans/instructions. I have found that a little overtight of specs works better.
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Old 02-03-2019, 06:15 PM
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Vlad Vlad is offline
Join Date: Oct 2008
Location: NJ
Posts: 7,733

Originally Posted by woodmanrog View Post

I have found that a little overtight of specs works better.
I have found that a little undertight of specs works better on an ice runway. Hi Roger
Where is N666BK?

Не имей сто рублей, а имей сто друзей.
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Old 02-04-2019, 03:46 AM
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rzbill rzbill is offline
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,587

I agree with Alex's post about putting flats on the Belleville washers.
Here is another aspect to look for. A descepancy in original manufacture of the pivot stop that bears on the pivot bearing.

I'll apologize up front for the pics disappearing sometime in the future.
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 800 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
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