Big AK
Registered User
BIG Alaska
Frank T......round intake.
Gdafoe........."75 RPM gain with the LEES exhaust", all other things being equal..........
.......Same weight and CG. . Same prop. Same driver. Same digital prop-tach. Same takeoff surface. Same takeoff technique........tail low, stick over until a wing lifts, center ailerons without changing pitch attitude, pull flaps.
2350 RPM on a 150 HP with an 82-41 and stock exhaust Versus 2425 RPM with the LEES system. Very nearly the same relative RPM figures as data from "static" RPM test with the tail tied down. The magnetos and plugs were freshly gone through a few days before I flew the first "control" flight to determine stock exhaust performance. Maybe a fresh ignition system aids in realizing a gain, but understand that the STOCK system test run ALSO had the benefit of the fresh mags and plugs. You guys who didn't see gains might look at your ignition systems or who-knows-what-else......I'm still wondering how Kase didn't see any gains back when he tried his LEES system.
Gdafoe........."75 RPM gain with the LEES exhaust", all other things being equal..........
.......Same weight and CG. . Same prop. Same driver. Same digital prop-tach. Same takeoff surface. Same takeoff technique........tail low, stick over until a wing lifts, center ailerons without changing pitch attitude, pull flaps.
2350 RPM on a 150 HP with an 82-41 and stock exhaust Versus 2425 RPM with the LEES system. Very nearly the same relative RPM figures as data from "static" RPM test with the tail tied down. The magnetos and plugs were freshly gone through a few days before I flew the first "control" flight to determine stock exhaust performance. Maybe a fresh ignition system aids in realizing a gain, but understand that the STOCK system test run ALSO had the benefit of the fresh mags and plugs. You guys who didn't see gains might look at your ignition systems or who-knows-what-else......I'm still wondering how Kase didn't see any gains back when he tried his LEES system.