minimoa mo2a -chris williams plan and cliff evans kit

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mick a
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Joined: 20 Mar 2015, 22:00

Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by mick a » 18 Oct 2018, 20:05

ok here goes
have tried 5th attempt at wing , still twisted , not sure what to do now ,as tried everything i can think of , i know a slight twist is ok
but i have a difference of 20 mm from root to outer rib , just on inner wing , if i glue (which i have tried ) , when twist back as though on jig it pulls the ribs or even break some
any advice would be great as just can’t get it
and can’t get on with anything else until done inner wings
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mick a
Posts: 165
Joined: 20 Mar 2015, 22:00

Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by mick a » 18 Oct 2018, 22:12

think i have found the problem , just need a solution
as you can see from photos , the trailing edge of ribs will not fit on the trailing edge
if i put ribs to trailing edge as should be it sets a twist like a dogs hind leg
these pics are with the spars straight
any ideas would be a great help
main problem is that i have to use inner wings to set incedence with wing box
so just concerned if wings twisted -incedence will be wrong
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chris williams
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Location: Blandford Dorset

Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by chris williams » 19 Oct 2018, 00:37

Mick, as you will have seen from my previous post, the ribs and the slots as drawn are all identical, so that shouldn't be happening. The solution is simple: ease out the rear of the top spar slots on the ribs on which the TE is too high. This should allow them to rotate up slightly. Use the straight TE to line the ribs up. They should line up on the LE now as well

mick a
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Joined: 20 Mar 2015, 22:00

Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by mick a » 19 Oct 2018, 09:04

thanks chris
will try that , although have glued all ribs to spars , so will have to cut rib at top as you said and add strengthener in
i presume all ribs should be level across top and bottom ?
will get there ?
on sitting incedence , should i add a small piece of leading edge ?
thanks again for all your help , it’s a brilliant forum
mick

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chris williams
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Location: Blandford Dorset

Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by chris williams » 19 Oct 2018, 09:34

Assuming the ribs are more or less identical, setting up the TE should be sufficient. When hand cutting, there are often variations at the LE: these are usually sanded out when trimming up the LE with a sanding block

mick a
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Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by mick a » 20 Oct 2018, 18:11

thanks chris
going to give it one last go tonight, will slice the top of rib behind spar and the put new sliver in-between rib and spar
fingers crossed 👍

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chris williams
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Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by chris williams » 20 Oct 2018, 19:58

Don't fuss packing out the ribs, Mick, it shouldn't be necessary

mick a
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Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by mick a » 20 Oct 2018, 22:36

finally 😄
got it square , or as close to before sheeting , just sliced the top of rib and lined up with trailing edge - as you said chris - just have a gap from top section of ribs to top spar, easy fix

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mick a
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Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by mick a » 26 Oct 2018, 19:04

a bit more done
all good so far
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chris williams
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Re: minimoa mo2a -chris williams plan and cliff evans kit

Post by chris williams » 05 Nov 2018, 16:12

A quick note for when you get to the outer wing panel, Mick... I have noticed that ribs have been plotted in Compufoil in such a way that the the aileron spar is not, as you might think, a straight taper, but is parallel out to rib 13, and tapers from there.
Also, a typo...J5 fits rib 19, not rib 20

(I've only noticed these things because my current Minimoa wings are based on the MO2a's, with the necessary mods)
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