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mp.gamble(at)talktalk.net
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 Posted: Fri May 13, 2011 1:52 am Post subject: Mono landing gear |
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On assembly The M8x100 bolts and their nyloc nuts were tightened to bring the upper and lower plates LG05 and07 together until their upper and lower bushes were 5 ¼’’ apart. I now notice that, with the aircraft weight on the wheel, there is a gap of about ½’’ between the lower plate and the nut. I suppose that this is to be expected as the polyurethane block compresses but are others seeing the same amount of slack here?
Mike
XS Mono
G-CFMP
[quote][b]
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JonSmith
Joined: 21 May 2010
Posts: 110
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| Posted: Fri May 13, 2011 6:52 am Post subject: Re: Mono landing gear |
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Hi Mike, this sounds totally normal I think. When you set up the rubber block assembly to the quoted distance (the later xs manual now states 79mm between the faces of the retraction plates - this is the equivalent of the earlier method of measuring but easier to measure) there's no weight of the aircraft on the assembly of course so the block is fully extended, constrained to it's maximum extension of 79mm by the 2 nuts and bolts. When it's all assembled and the aircraft is sitting on it's wheel the rubber is compressed (the reaction plates come closer together) and this movement is catered for by the bolts sliding up/ down through the holes in the upper and lower reaction plates. As soon as the weight comes off the wheel then the block will extend to it's maximum amount again as limited by the bolts. When I bought my Europa (didn't build it) the first time I looked up inside the wheel well and saw these two bolts loose and apparently "nearly undone" I thought the whole assembly was falling apart until I realized how the system worked.
On my plane I replaced the rubber block this winter as age was taking it's toll and the plane was sitting a bit low. Once dismantled I compared the old and new blocks (uncompressed) side by side and the old one was at least 1 cm shallower than the new one due to years of compression and loss of elasticity I guess. My plane now sits that much higher on it's wheel and so the distance between my nut/ bolt heads and the plates is correspondingly less.
Cheers, Jon
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