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Salvage - a new 42" wing.
08 Jun 2013 20:41 #1
by Quorneng
Salvage - a new 42" wing. was created by Quorneng
The plane I call the Big Dragon has (had!) two wings. One 60", one 78" (2m).
I managed to cartwheel the big one and snapped it in two places.
Given its very light construction a straight repair, particularly of the spar, would be difficult to achieve the original strength.
Call me Scrooge but I hate to throw anything away so a cut down job.
The outer break should repair with adequate strength and there is internal access to the centre joint to ensure sufficient glue area.
With a swept back spar the wing should twist under extreme load to off load the tips.
Anyway at the moment I can only build additional wings for my existing planes as I have no more room!
I managed to cartwheel the big one and snapped it in two places.
Given its very light construction a straight repair, particularly of the spar, would be difficult to achieve the original strength.
Call me Scrooge but I hate to throw anything away so a cut down job.
The outer break should repair with adequate strength and there is internal access to the centre joint to ensure sufficient glue area.
With a swept back spar the wing should twist under extreme load to off load the tips.
Anyway at the moment I can only build additional wings for my existing planes as I have no more room!
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10 Jun 2013 14:10 - 10 Jun 2013 14:12 #3
by Quorneng
Replied by Quorneng on topic Salvage - a new 42" wing.
Oh-er!
Before I threw away the damaged centre section of the big wing I thought I would test the strength of its built up balsa/Depron/balsa spar however when I cut away the Depron wing surface I discovered I had built each wing half differently!
The left was built with a continuous spar shear web and divided 3 piece ribs whereas the right had complete ribs with individual shear webs between them.
I have absolutely no recollection I did this (my age?) and the pictures I took during its construction only cover one wing half.
As the content of material (and glue!) is exactly the same in both I doubt it really makes any structural difference although the 'one piece' rib method probably maintains a truer wing section.
The cut down wing structurally complete.
Before I threw away the damaged centre section of the big wing I thought I would test the strength of its built up balsa/Depron/balsa spar however when I cut away the Depron wing surface I discovered I had built each wing half differently!
The left was built with a continuous spar shear web and divided 3 piece ribs whereas the right had complete ribs with individual shear webs between them.
I have absolutely no recollection I did this (my age?) and the pictures I took during its construction only cover one wing half.
As the content of material (and glue!) is exactly the same in both I doubt it really makes any structural difference although the 'one piece' rib method probably maintains a truer wing section.
The cut down wing structurally complete.
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10 Jun 2013 18:03 #4
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic Salvage - a new 42" wing.
What can I say? It's better than building two left (or right) panels! 
if you are calm and collected when all about you are going berserk - you've missed something important!
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