Here I'll put a collection of mechanical information/ideas regarding my

Sonex Plansbuild Airplane Project

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Kart seat-pan:

This type of seat may be just right for the dual-stick setup. The seat-pan is available in carbon-fibre and covered with thin deer-leather (and is probably still less heavy than the Sonex sheet aluminum pieces).

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Drills, Hole Sizes, Hole diameter Limits, June 17th, 2001

(for rivets used at Sonex, taken from AC43-13)

Rivet	Drill Size	Min. Hole Diam.	Max. Hole Diam.
AD4 = 1/8" = 3.18mm	#30 = 3.25mm	0.125" = 3.18mm	0.135" = 3.43mm
AD5 = 5/32" = 3.97mm	#21 = 4.04mm #20 = 4.09mm	0.156" = 3.96mm	0.171" = 4.34mm
AD6 = 3/16" = 4.76mm	#11 = 4.85mm #10 = 4.93mm	0.187" = 4.75mm	0.202" = 5.13mm

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Seats, June 15th, 2001

I researched the racing cart scene recently, particularily for brake/rim products. Besides of this interesting products I found also very lightweight carbonfibre seats. I tend to install two of these instead if the crude Sonex sheet metal seats.

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Bushings, March 28th, 2001

For support of the elevator pushrod the Sonex' plans show some cheap 'snap-in' plastic bushings. From my point of view this will cause unnecessary friction in the pitch control system. Friction counteracts the airodynamic counter-forces which may lead to unpleasant flight characteristics. So what I'll do is to install low-friction linear bearings

Igus is a German supplier for such quality plastic bushings (iglidur)