A higher cruise speed in a STOL aircraft has also been on my list for some time. After doing over 50+ engine packages for the STOL Zenair 701 by Chris Heintz, I would say that the only complaint voiced by our engine customers is the slow cruise speed. So far in this post, however, no one has mentioned the PegasSTOL wing option for the Zenair. It basically adds the proven automatically retractable slats, fowler flaps, and a much higher cruise speed favorable airfoil of the Helio Courier to the Zenair 701 airframe with tail-dragger option. In the Ultralight area at Oshkosh this year, there was one, and he has flown it in cross country from Los Alamos, NM more than once. It has a great cruise speed (but with more than 100HP). I will try to post a photo of it.
Trimming drag off the gear and fuselage of a 701, though useful up to a point, would probably not be as beneficial as a better STOL wing design. I spent some time this year in the museum at Oshkosh taking a look at the wing on the Buttercup. When you look at what Whitman was doing in his era, its more than just a little impressive. Remember, he had integrated decent STOL performance/ VERY high cruise speed/ AND was doing this on LOW HP. This guy knew what he was doing in the arena of aircraft design.
Anyone know what airfoil he was using on this application and what the camber was when the leading edge flap was fully extended?
Raven ReDrives Inc.