Brett & Tiana wrote:

Hi all, me again. Still working on the same relative merits report comparing the 13B, Subaru EJ-22 (Stratus), and the Belted Air Power 4.3L V6, and looking
for some confirmation of the accuracy of my hp and torque figures.

My comparisons heavily favor the 13B based on info gathered over several years, but accuracy on my part is crucial and the sources of some of these figures
are sketchy since they rely on info from the installation suppliers.

For example, the April 2002 issue of Kitplanes lists the hp and torque figures for the Stratus EJ-22 as being 180hp @ 5900rpm and 157ft-lbs of torque at
4600rpm; The BAP V6 is listed as producing 180hp @ 3700rpm and 375ft-lbs of torque at 3600rpm; and the Atkins 13B is listed as producing 160hp at 5500rpm and
159ft-lbs of torque at 5200rpm.

Dave Atkin's figures sound accurate, and assuming that the fine folks at BAP and Stratus aren't bald-faced liars I have accurate info to go on. One question I
have is this: We know the rotary is capable of 180hp without internal mods, but in examples such as Tracy's at what rpm does this occur? I'm aware that the

<<<BIG snip>

If you want to get the best MPG in your airplane you need a variable pitch
prop so you can slow the cruise RPM and move closer to the best BSFC island.

Paul Lamar

Paul as a thought on the variable pitch props I saw an airplane at SERFI 03 that was using a honda motorcycle engine right along with the transmission. He used one
gear ratio for take off and another for cruise etc. It even had a chain drive to the prop. The FWFWD package was about the same as a lycoming, or a vw with gear
reduction.. He just sat the engine and transmission assembly in the frame, ran the chain up to a prop shaft and hooked up the throttle and a gear shifter. Claimed it
flew great.
Royce

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