A little late in posting... The Boeing 40 has flown... It flew mid-February. Here is a quote from Addison...
The test flight this weekend went perfect with my sons Jay and Ryan flying chase in our C-185 (Spot) loaded with video and camera.. I was able to fly the airplane hands-free within a few minutes of flight.. In all flight configurations I never used more than 1-1/2 degrees of trim change including slow flight at 55 mph. Cruise was dead center with the 29 percent MAC CG.. The airplane is very controllable and pleasant with excellent ground handling, good elevator, and very good rudder control and heavy but effective ailerons with a disproportionate amount of rudder needed for more than 50 percent travel. The visibility is very poor, but not difficult. The overwhelming surprise is stability! 'Like a rock.'
Congrats to the Pemberton's! Photo by Ryan Pemberton