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Building Tips and technical articles. => Building techniques => Topic started by: Fred Quedenfeld jr on February 05, 2016, 03:13:38 PM

Title: Half ribs
Post by: Fred Quedenfeld jr on February 05, 2016, 03:13:38 PM

How do you install the half ribs like in the Hobo or fzed twister?
I tried to pin to the bottom spare but they split
do you install both spars ans leading edge than twist the half ribs inplace?
thanks
Fred Q

Title: Re: Half ribs
Post by: Mark Scarborough on February 05, 2016, 03:23:11 PM

That is in fact pretty much how I have done it, built the wing with the full ribs,, then rotate the half ribs in place, a drop of CA in three places finishes the deal

Title: Re: Half ribs
Post by: Steve Helmick on February 05, 2016, 04:33:15 PM

I've made half-ribs as individual pieces (top & bottom, but both the same, being a symmetrical aerofoil). Uses less balsa, you can use the frags from cutting the full ribs, and comes out lighter. If you wanted to, you could make them with a bit excess on the outer surface and sand them flush with a long sanding board...with a chord-wise motion.  y1 Steve

Title: Re: Half ribs
Post by: john e. holliday on February 05, 2016, 08:16:55 PM

I used the same ply templates that I used for the regular ribs.  Yes you put them in after main wing is framed up.   Not that hard and I didn't break any ribs.

Title: Re: Half ribs
Post by: Tim Wescott on February 06, 2016, 10:26:20 AM

What Mark said.  If the ribs are cut reasonably accurately then you just rotate them into place and glue with your favorite.