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Aluminum wing spar to cabin floor attachment

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Jonny C

Member
Joined
Jun 17, 2014
Messages
17
Location
London, UK
Hi everyone, I'm doing some drawings for a conventional aluminum low-wing single seat plane that could be easily made with my CNC router.

For simplicity, I would like the center section of the wing to sit on top of the lower longerons. The issue of restraining the L angle of the lower spar cap then arises.

In the attached pic there's a sketch showing the spar (grey with green caps), lower longeron (pink) and a red formed hat section which is riveted to the floor skin and the lower spar cap. Does anyone know if this is a viable method for restraining the lower spar cap? Has any other design used a similar method?

The alternative would be to have a break in the longerons so the wing spar sits directly on the floor skin, with a splice section on the outside of the floor skin (shown in the drawing spar 2). Thanks for any thoughts on this.
 

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