Bruce,

I really learned something from your answer. That's what's great about RCU, no matter how long you have been doing this, you can always pick up something.

As I was reading your answer to the tuck, a few things from way back clicked. First, Ed Westwood designed a couple of flying wing or partial flying wing seaplanes back in the 1980s. The first was the Beast, a low wing, single float seaplane. It has a reflex airfoil similar to Evans' Simitar airfoil except much thicker. The Beast also had a small, fixed stab mounted atop the twin fins. He (Westwood) said it aided pitch stability.

His second design was the 2 Ugly, a shoulder wing, short coupled, twin float plane using what looked to be the same airfoil except this time he used a very small, low mounted stab and elevator. I just scanned the plans (which I never built) and it appears to be about 10% on the wing area. Both planes were reputed to be good fliers. Both had reflex airfoils and small horizontal tails.

My 3rd item that clicked was my own experience in the 1980s with flying wings. Mine were rectangular plan form with symmetrical airfoils. I had started with elevond, but didn't like the roll characteristics, so I switched to separate ailerons and elevator. After testing and rigging, I found the best set-up was with the ailerons reflexed upwards and the elevator neutral. If I didn't use the aileron reflex, the plane would pitch down if I lost power as the elevator wasn't large enough for total pitch stability and control. I assume that the prop blast was aiding the pitch control.

Getting back to the original question, if the Speedy Bee were built with reflex in the wing, it might be that the small stab would be enough.