Compared to the speeds others say they're getting, my plane seems awfully slow. Mine is a 7A, weighing in at 1,010 with full wheel and leg fairings. The engine is a new Aerosport IO360 with 9.2:1 pistons, roller lifters, LightSpeed ignition. Should put out about 190 HP. In search of speed I fitted Sam James Holy Cowl and plenum. The prop is a fixed pitch Catto 3 blade 66" Diameter by 76" pitch.
At 2450 RPM at 2,000 ft, I'm seeing 155 Kts (180 MPH). Wide open which is 2700 RPM I see 162 Kts (190 MPH).
From what I gather, everybody else is cruising at 170 Kts (200 MPH) or better, and their top speed is 185 Kts (215 MPH).
Any ideas why I'm so slow?
At 2450 RPM at 2,000 ft, I'm seeing 155 Kts (180 MPH). Wide open which is 2700 RPM I see 162 Kts (190 MPH).
From what I gather, everybody else is cruising at 170 Kts (200 MPH) or better, and their top speed is 185 Kts (215 MPH).
Any ideas why I'm so slow?