Thanks, Tall Paul. I see that the thick flat plate has different shape leading and trailing edges, so it's not quite symmetrical front to back. Of course, that can be fixed. The thin flat plate is very familiar in modelling, but from my experience the centre of pressure on these is toward the leading edge, maybe 25 to 35%. I don't see any information on centre of pressure on the graphs, or pitching moment, and that's what I'm really searching for.

Just to clarify, I am thinking of a model that can reverse it's direction in flight, without changing the position of the C of G, without changing wing incidence, and without moving the wing forwards or backwards along the fuselage. Basically, just hit reverse thrust and fly away! I'm not sure it's even possible. Finding a suitable airfoil is the first step, and a possible showstopper. Thanks again.

Cheers from the Barfly.