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Sig 1/4 Scale Piper Cub - Wing Struts (advice sought)

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James Hindle04/03/2011 23:20:49
210 forum posts
121 photos
I've just purchased a beautiful SIG 1/4 scale cub, a lot larger than expected but covered in glorious solatex which was the deal maker for me.
The bit that bother me is the wing struts which are functional but are fixed making storage very difficult, has anyone any experience of alternatives using metal hinges or anything else so the wings fold flat, it would seem quite simple and retain the structural support but what about the mid support bar ?
Thanks for any help

Martin Harris05/03/2011 00:13:27
7440 forum posts
186 photos
I'm in a similar situation with a 1/4 scale Cub which I bought from a deceased member's estate in an advanced state of construction (covered but not fitted out) but with rather odd hardwood struts which I replaced as per the kit instructions (Aerotech International) with struts made from (good quality) 1/4 ply.
Unfortunately it suffered an in-flight structural failure after a few outings, on a rather gusty day, which I put down to a failed strut at first but on stripping the airframe to rebuild it, found that the strut fittings were drilled through the 1/4 square hardwood spar members! The point of failure was at these holes, unsurprisingly, but scuffing on the broken wing's tip had made me think that failure was due to impact until then.
Needless to say, these areas have been redesigned during the repairs and I'm just at the stage of thinking about the strut construction as I don't really trust the kit method now (to be honest I had some nagging doubts but assumed the designer probably knew best) - what are yours made from?  Mind you, although there was considerable distortion, the other 3 struts remained intact so maybe they weren't so bad?
To get to your question, my thoughts on the jury struts are to use ball joints to allow easy folding for storage and retain the main strut end fittings with R clips for ease of assembly. These are an important part of the structure and need to be slop free.
I'm using an ASP 160 twin for mine and it was so scale like when flying - quite a contrast to some of the stuff I fly but extremely rewarding so I have to repair it!

As you can see I was still finishing it off - trying to get a match for the cowling paint when the "nasty" occurred but I'm recovering it in traditional Cub Yellow...and no, that's not the crash site by the car!

Edited By Martin Harris on 05/03/2011 00:45:35

Daniel Cardona13/03/2011 19:37:12
145 forum posts
251 photos
i hope is not too late but you can find a solution on this website
check on the left hand side of the main page ,you'l find a title FOLDING STRUTS. A modification made for the sig 1/4 scale cub.
James Hindle20/03/2011 10:54:29
210 forum posts
121 photos
Thanksfor the help guys, in the end I opted for replacing the screws for imperial dubro rigging couplers then used the hanger 9 idea of R clips, seems to work.
Long term will opt to permanently join the wing and reduce the need for the struts.

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