SIG Foam Wing (oz16499)
About this Plan
SIG Foam Wing. A plan showing a balsa-construction alternative to the SIG foam wing used on many designs.
Note SIG produced two different foam wings. This here is the tapered wing. For the straight wing (with semi-symmetrical airfoil) see SIG Foam Wing Straight (oz16514)
Direct submission to Outerzone.
Quote: "Mary/Steve; I looked at the Midwest Foam Wing (oz16454) drawing by Andy Kunz and decided to have a go at a replacement for the SIG Foam Wing. I based this drawing on the details contained in the comments on that Outerzone page Midwest Foam Wing (oz16454) using the recommended aerofoil and the dimensions mentioned.
I attach it here for your consideration - it may be of some use to your readers. I noted on the drawing that I can provide short kits and I have an extensive catalogue available."
Note contact details for Kanata Aircraft Models are found here: https://www.facebook.com/KanataAircraft/
Update 7/1/2026: Added ribs (only) file, thanks to DougSmith, to fit on a sheet of A4.
Supplementary file notes
Ribs (only).
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(oz16499)
SIG Foam Wing
by Mark Winstanley
from SIG, Kanata Aircraft Models
December 2025
44in span
Extra
clean :)
all formers complete :)
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Submitted: 01/01/2026
Filesize: 71KB
Format: • PDFvector
Credit*: MarkWinstanley
Downloads: 473
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User comments
I remember the Sig Foam Wing, used in several Sig kits, popular with builders who hated to build wings. Most of them used the popular OS 15 engine, reliable and cheap. Tapered wings are especially troublesome built from plans because the rib drawings were not very accurate. I know how hard it is to draw a good set of tapered ribs with nothing more than a french curve and a pencil. That's because I've done it. This plan features accurately drawn CAD ribs, a huge advantage. See ribs cropped from the drawing so you can print them out on your own printer [see supplement file]. It just barely fits on a sheet of 8-1/2 x 11. This way you won't have to cut up your big plan sheet. Cut out each rib from paper and paste it on balsa, then cut just outside the lines and sand it to final shape, paper still attached. Sand across the grain with a block. You can peel the paper off when finished. Don't use CA. Resist the temptation to sand the whole set pinned together, you won't get them any better. A perfect set of ribs that will fit your plan. See supplement 'ribs only' file.Doug Smith - 07/01/2026
Thanks Mark, you saved me the effort of importing that particular airfoil into Compufoil! All the similar airfoils in Compufoil had some degree of undercamber. (Various Gottingens..)
Now I want to see some new Super Sports, Klippers, Scamps and Colts. I have a Super Sport, it’s fun little plane.
Dave - 07/01/2026
Well... apparently there was another Sig prefab/molded foam wing with a sorta weird semi-symmetrical airfoil (see oz12446), unless the "April's Fool" theme of the article carried over to the plan's drawing... Now THAT would really be weird.
RC Yeager - 08/01/2026
Thank you! I doubt my wife will want to build another Klipper, but, if she wants one, this makes it a lot easier.
She built hers (yes, SHE built it in 1976) and we both flew it for several years.
Bill Bowne - 08/01/2026
For more see post #8 in this thread:
https://www.rcuniverse.com/forum/golden-age-vintage-antique-rc-196/2917393-sig-relic-beaver.html
dave - 11/01/2026
Here is a magazine ad [pic 003] for those 4 Sig planes that used the foam wing they produced. Dave
dfritzke - 12/01/2026
So, my old Sig catalog indeed [also] shows a constant cord, semi symmetrical wing was offered by Sig [pic 004], and two kit offerings used it at the time [pic 005]. There may have been others, I seem to recall a Dehavilland Beaver... Dave
dfritzke - 12/01/2026
Well, there you go... thanks Dave... and at 45" span and 6.5" chord it matches perfectly with the plan I previously referred to in my previous comment. So this will be another nice CAD project for someone to tackle.
RC Yeager - 12/01/2026
Now we need people with the kits that used the wings to make copies of the plans and upload to this site, I doubt Sig is going to produce these again anytime soon.
Douglas Babb - 13/01/2026
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- SIG Foam Wing (oz16499)
- Plan File Filesize: 71KB Filename: SIG_Foam_Wing_oz16499.pdf
- Supplement Filesize: 952KB Filename: SIG_Foam_Wing_oz16499_ribs_only.pdf
- help with downloads
Notes
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
Scaling
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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