Keeping stringers straight

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Re: Keeping stringers straight

by mmarien » Wed Jul 08, 2020 5:52 pm

I came across this thread while I was doing the research on stringers. I also found this picture on the Hatz Classic CD. It looks like the builder interlaces tape the same as for ribs in the wing. Just another solution to keeping the stringers straight for covering.
Tailcone - inside.jpg

Re: Keeping stringers straight

by TangoWhiskey » Sun Dec 01, 2013 5:37 pm

splischke wrote:I used cyanoacrylate to temporarily hold a ply strip to a stringer. The CA bond isn't very good but this worked in my favor since I was able to relocate the stringer if it was off. Once the entire stringer was straight, I epoxied pieces of triangular spruce stock to make the bond more permanent. The picture above doesn't show these spruce pieces. I hope this makes sense.

-Scott
Makes perfect sense! Thanks. I was thinking that clamps might cause more bending/twisting, so this solution makes total sense... Simple and effective.

Re: Keeping stringers straight

by splischke » Sun Dec 01, 2013 5:35 pm

I used cyanoacrylate to temporarily hold a ply strip to a stringer. The CA bond isn't very good but this worked in my favor since I was able to relocate the stringer if it was off. Once the entire stringer was straight, I epoxied pieces of triangular spruce stock to make the bond more permanent. The picture above doesn't show these spruce pieces. I hope this makes sense.

-Scott

Re: Keeping stringers straight

by TangoWhiskey » Sun Dec 01, 2013 5:05 pm

splischke wrote:Hi John,

The 1/16" ply vertical supports worked great. I had to use two per bay but I managed to get the stringers nice and straight.

Again, thanks for the idea.

-Scott
Scott, did you just clamp those in place as the glue set up, or use some other method?

Re: Keeping stringers straight

by splischke » Sun Sep 01, 2013 6:55 pm

Hi John,

The 1/16" ply vertical supports worked great. I had to use two per bay but I managed to get the stringers nice and straight.

Again, thanks for the idea.

-Scott

Re: Keeping stringers straight

by splischke » Fri Aug 30, 2013 12:49 pm

Thanks John. I like the idea and will likely do exactly the same.

-Scott

Re: Keeping stringers straight

by jwhanson » Fri Aug 30, 2013 12:38 pm

Fuselage78 03-16-07.jpg.JPG
Hi Doug,
We cut 1 inch strips of 1/16 plywood and glued them from the top longeron across all the stringers and down to the bottom longeron. This held them in place very nice. We used two on each side behind the cockpit.
John Hanson HC-012

Re: Keeping stringers straight

by dougm » Fri Aug 30, 2013 10:40 am

Well, I'm obviously not there yet so I can't comment from experience, but could you make a couple of formers to attach where the warping occurs to pull them back into alignment? I don't know how comfortable I'd feel relying on the fabric to keep them in line, but I guess it would depend on where and how bad the warp is.

I assume you've already sealed the stringers, right? If not you could try to steam them and "unwarp" them.

Re: Keeping stringers straight

by splischke » Fri Aug 30, 2013 9:33 am

Warped before covering. I was thinking of tying them up with rib stitch cord or making small wood blocks to hold them in place. After covering, I think the tautness of the fabric and the glue will keep the stringers from moving. I'm just wondering what others have done.

-Scott

Re: Keeping stringers straight

by dougm » Fri Aug 30, 2013 9:24 am

Are you saying your stringers warped prior to covering or during the covering process?

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