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robertpeterfrost
Joined: 07 Jan 2008
Posts: 13
Location: Wakefield. UK
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 Posted: Tue Jun 10, 2014 9:05 am Post subject: Wheel Shimmy, Again! |
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We are experiencing nose wheel shimmy again on our XS Tri-Gear G-RPAF.
We have replaced the Belleville disc washers from Springmasters and tried the revised configuration of 6 off of the larger 95012 discs rather than the original 4 off P281315 and 2 off 95012. We are also using Newgate Simms (NL 1013)
868H Gel on the friction plate. When we tighten it up we can only get the
Maximum damping friction to 15lb before it breaks, if we tighten the castilated nut any further the damping effect diminishes to around 10ib. The required break tension is stated at 8 to 10 kg (18 to 20lb).
Any suggestions to achieve the correct settings would be appreciated?
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 388
Location: Aberdeen area
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| Posted: Tue Jun 10, 2014 10:48 am Post subject: Re: Wheel Shimmy, Again! |
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Just over a year ago I completed converting my Classic from mono-wheel to tricycle, which is the cleverest thing I have done to my pride and joy since she first flew in July 1997.
The nose-wheel assembly is bog standard with the normally supplied washers and friction disc. I was advised that if I "fanny around" as most others do following the instructions, trying to adjust for optimum friction and yet hoping to have smooth "turnability", I would be just as disappointed and frustrated as most others.
The trick is:
http://www.newgateonline.com/manufacturers/nye-lubricants/pg-44a-50gram-jar.html
If you read the blurb you'll see "Commonly used by private light aircraft owners to cure nose wheel shimmy problems".
Apply sparingly to the friction disc, probably only on one side is necessary, but I unthinkingly smeared it on both sides. No harm done though. I also used it to lubricate the pivot shaft. Thereafter tighten the stack of washers until, with the nose-wheel off the ground, it takes some effort to turn the wheel. Not too difficult and heavy, but you be the judge.
The result is that even after a year the aircraft can be turned smoothly without stiction/jerkiness and shimmy just doesn't happen. I know what a sticky/jerky nose-wheel can be like because I fly heavy 19-seat helicopters for a living and this can be a problem when taxying to the runway.
When you come back to praise and thank me for this advice, I'll tell you how to drop your climb oil temperature by 20C in a Classic with two water radiators and an oil cooler piggy-backing behind the left one.
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