Craymondw(at)aol.com
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 Posted: Wed Jul 18, 2007 7:39 am Post subject: speed mods |
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I talked to a racer that tried using a lower profile wind screen on his GL 2 TD and claimed the craft didn't have any speed increases with the modification. Ken Johnson said NASA didn't find a problem with the wind screen on his GL 3. Stoddard Hamilton reported an increase in speed by removing the lower belly cowling from the lower cowl. Merrit Island NASA engineers found Glasair two's and three's without wing fairings faster that one's with them. The former aeronautical engineer that worked for Stoddard Hamilton had a retrofit wing fairing that he claimed would add up to fifteen miles per hour to the cruise. Wheel pants on Glasair three's and two's look pretty but aren't well designed. Stoddard Hamilton didn't supply an "upper" nose strut fairing. That fairing is important because it keeps pressurized air out of the cowling. Glasair's retro fitted with RV wheel fairings report several mph increases. The exhaust outlet on the two's face down. Cirrus found that by facing the exhaust out lets to the rear it added thrust and speed. Last night I talked to the builder using a McCauley prop on his Gl 2. He reported that he didn't like the round part of the Hartzell and the thin tip. He went on to say that the last third of a prop does all the work and likes the "tennis racket" look of the McCauly. He also sawed off his wing fairings. His Gl 2 FT is very fast with a cruise speed of 220 mph using a 200 hp Lyc. He is going to remove the Hartzel from his three and install a McCauley and thinks his cruise speed will increase. My best cruise speed with my Hartzell is 2375 rpm. When I increase the RPM the plane goes slower. I think my Hartzel at higher RPM's creates turbulence.
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