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DS43.2.7 - December 2008 After a hiatus to focus upon my graphic design and marketing business, I've started doing some small refinements again to
DS43.2.7 - December 2008 After a hiatus to focus upon my graphic design and marketing business, I've started doing some small refinements again to
DS43.2.5 - March 2008 More refinements to the size of the control surfaces (especially the elevator and ailerons), and I finally drew the rudder th
DS43.2.4 - February 2008 The fourth iteration brought a new canopy shape for less drag than the earlier flat-wrap canopy. I began sizing the flight
DS43.2.3 - January 2008 The third iteration of the design took away the wooden space frame structure in the fuselage, and baselined Rutan-style com
DS43.2.1 - November 2007 This is the first version of the flying-plank design that was competing with the swept-wing 43.1 design. This proved easie
DS43.1 - November 2007 The original concept, as a swept-wing 'flying wing' design. Far beyond my abilities to analyze, unfortunately. Maybe next ti
Topaz

DS43.2.7 - December 2008 After a hiatus to focus upon my graphic design and marketing business, I've started doing some small refinements again to

Ace_Plumber
Topaz you seem more up on design concepts than Myself but it seems to me that the swept wing would have far greater pitch stability....just my thinking....TLAR method (that looks about right). What do you think about Jim Maupins Carbon Dragon? I know very little about sail planes but the Carbon Dragon has always facinated me. Maybe I will attempt one if I live long enough.
 
Topaz
Once you dig into the math, you find out that stability can be dialed in for practically any shape or planform. My design above has about 8% positive static stability margin at the design CG position - about the same as most sportplanes. It's all about the relative positions of the CG and neutral point.

I like the Carbon Dragon. It's a pity that Jim's family won't sell the rights to the plans, or distribute plans themselves. That design is dead now, simply out of fear. Too bad.
 

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A tailless "flying plank" sailplane.
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