pchapman(at)ionsys.com
Guest
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 Posted: Wed Jul 18, 2007 2:03 pm Post subject: Fuselage Gussets |
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At 23:11 20-01-07 (way back), you wrote:
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As an old 601 owner, I found that there were cracks in the 16 thou
side panels (both sides) that I noticed after 13 years. Not only
that, but water had gone in thru the crack on one side and the rivet
had turned to alum oxide. Even with the 25 thou panels, I still
suggest that unless the vertical stiffener is locked to the upper
longeron, vibration would do the same to the 25 thou panel.
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I also found cracks in the paint at 2 or 3 of the intersections as
mentioned by Dave Austin -- between the upper longerons and the
vertical stiffeners in the aft fuselage.
601 HDS, 8 years old, 350 hours, built using 1994 kit plans that
didn't show gussets at those top intersections.
My dad had questioned that design when building it. The cracks
occurred in the side of the fuselage built to plans. On the other
side, built second, he extended one leg of the vertical L angles
under the longeron, somewhat stiffening the junction without a
separate gusset.
We now installed 0.025" stiffeners to prevent further fatigue at many
of the unreinforced intersections. (Although some later plans just
show 0.016" stiffeners.)
Had to wriggle into the fuselage to install the stiffeners, with a
sawhorse under the fuselage and a custom fit board & various cushions
inside the tailcone to support my weight.
Peter Chapman
Toronto, ON 601 HDS / 912 / C-GZDC
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