Thorp Air Command - T18.net

On my flying Thorp, I remember joggling the WL 42 longeron angles back where the stabilator attachment fittings are. I can't find a reference to that in drawing. Any help on where to look would be great.

This is my project, Scrappy.

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Bob Highley
N711SH
SN 835
KLAL

Bob, the -575 bulkhead drawing shows a 0.125" joggle in the bulkhead for the WL 42 stringer and the 584-1 flange which are both 0.063" in thickness. So I guess that the WL 42 stringer would be joggled 0.063" for the -584 fitting. The WL 42 stringer is called out on 580-3 L&R but my -580 drawing has no mention of a joggle in the WL 42 stringer. Hopefully this is of some help.

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Bruce Finney
N18JF T-18C #262
Yelm, WA USA

Yeah, that's what I found, too. Might have been in the newsletter.

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Bob Highley
N711SH
SN 835
KLAL

I would be very interested to learn the best method to joggle a longeron.

Hi Bob, hi guys. Dwg 575 specs .125” joggle in the -1 bulkhead for this. Note there are three different joggles in that area. It’s easy to do in sheet metal. That accounts for the single 1/16” thickness of the leg on the fitting and the 1/16” longeron. You won’t have to joggle the longeron. I wouldn’t attempt it since I doubt you could get the remaining length straight again. I remember putting a joggle in R & L longerons against the firewall. Though possible, it was difficult enough. The third joggle in the corner is for the flange on the turtle deck skin. Hope this helps.

Say, don’t forget, there are newsletter articles about improvising the 591 fitting for tail wheel at bottom of that bulkhead.

Les

Thanks, Les.

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Bob Highley
N711SH
SN 835
KLAL