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cpayne(at)joimail.com
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 Posted: Fri Jan 06, 2006 3:27 pm Post subject: Prop Pitch Testing |
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I flew the CJ with that thinner pitch stop ring the other day and was delighted to get a cruise II setting of 1730 RPM (at) MP of 635mm. I didn't climb up to where 635 was all I could get at full throttle...I'll save that for another day. I could also get down to1640RPM. At cruise II I could see TAS speeds that many Yak-52's only get at the 70% nominal II setting.
Now for the fuel flow tests. Using Book figures, the Cruise II horsepower equals 60% of of Nominal II which is 240HP; therefore (240 x .6 = 144HP). Perhaps some formation flying at Waycross will yield comparative fuel burn numbers.
That thicker pitch stop ring had "30" etched on the surface but it clearly was Not 30mm so I wonder what that number represents??
Craig Payne
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wlannon(at)cablerocket.co
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| Posted: Fri Jan 06, 2006 4:04 pm Post subject: Prop Pitch Testing |
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Craig;
That "30" would indicate a coarse pitch blade setting of 30 degs.
You have now increased that which increased the available range the governor has to operate in. Hence your improved cruise performance.
Walt
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