New Ap, called "Smartbutt". :-)
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Space is often at a premium in a single-seater, though, and I'd probably have to rig up some sort of folding arm so I could push it away while getting in and out.
WWII Navy airplanes often had pull-out chart tables at the bottom (or even the middle) of the instrument panel.
Attachment 3601
I've been tempted to try add something like this to the Fly Baby... it's a free run for ten inches or so under the panel, so I could put in a short pull-out table there. There's a potential for interfering with the stick, though (especially if something broke), and my knee room is tight enough already.
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Ron "Cheap is my middle name" Wanttaja