Charlie and Tupper England wrote:

How about apples to apples (as in before & after baking the same
apples)?

Kent Paser converted his bubble canopy Mustang II to fast back. His book
details the speed gains of his mods. His 2nd largest gain came from the
fastback, more sloped windshield, lower canopy, & preventing air spill
out the sides of the sliding canopy in flight. 12 MPH. He used the
original round canopy, which is similar in shape to the -4's canopy. The
largest gain was essentially gear fairings (19 MPH).

Incidentally, moving his 3 antennas inside the canopy got him 5 MPH.

The really impressive thing is his bottom line. Side-by-side airplane,
basically stock 160 HP Lyc engine:
12,000 ft 2850 rpm 232 mph true burning 9.2 gph.

He says his "max cruise" is 219 mph, 8.0gph, 2700rpm, 12,000ft. Climb is
2000fpm at 7000 ft. Stall is 63mph indicated at 9000 ft.

His original max cruise was 159 mph at the same fuel flow, alt, & rpm.

Charlie

The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org