K-18 washout

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harry curzon
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Location: Cheltenham

K-18 washout

Post by harry curzon » 14 Jun 2019, 07:11

I am building the Charlesworth 1/4 K-18 from the lasercutsailplanes kit and plan. Plan says that the washout is 10mm at tip t/e. My calculation says that is about 7 degrees which seems far too much. Can anyone confirm what it should be for this model?

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Cliff Evans
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Re: K-18 washout

Post by Cliff Evans » 14 Jun 2019, 08:09

Harry. That is what it states on the plan, I have seen many of these built to this spec, all fly very well. That washout starts at rib 28 (Inboard aileron position to tip) Which actually calculates to 0.75 degrees. Not 7 degrees!

John Vella
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Re: K-18 washout

Post by John Vella » 14 Jun 2019, 08:54

Harry, that seems about right, and knowing several Charlesworth models he does not get that sort of thing wrong. The MU 13 I am building goes for 6mm washout . Regards John.

BrettW
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Re: K-18 washout

Post by BrettW » 14 Jun 2019, 12:14

Talking of wings for Cliff Charlesworth's 1/4 scale K18 has just reminded me I need to ask a question regarding the (very slow) build of my own LCS kit

Screwing up jobs once they get too complicated is my amazing superpower, so I'd rather not cut all the ribs to attach to a built up box spar. Has anyone tried a different aproach, such as using a tapered CF wrapped tube I wonder? All suggestions welcome - especially if they've actually been tried out and found to work!

Brett

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Cliff Evans
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Re: K-18 washout

Post by Cliff Evans » 14 Jun 2019, 12:18

Most modellers have their own prefered methods! Not one way can be deemed as being better than the other. All I am sure will have been tried at some point by someone over the years! Whatever floats your sailplane!

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