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bruce(at)whiteantelopesof
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 Posted: Sun Jul 23, 2006 9:28 am Post subject: CH601HD performance with prop stopped |
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Airplane: N269BB
CH601HD, Stratus EA-81 engine, 664 lb empty weight, Warp drive 70” tapered 3-blade prop, Taildragger w/factory wheel pants
Test conditions: OAT 69F, calm surface winds, apparently calm winds at altitude, approx 205lbs of fuel/pilot/junk on board.
Test: Climbed to 10000MSL, pulled throttle to idle (1100 engine RPM, ~500 prop RPM). Established 50KIAS on a constant heading. Descended 1000 ft with prop idling, monitoring glide ratio as displayed on a GPS receiver. Stopped engine (prop stops) and descended another 1000ft. Restarted engine at idle and descended another 1000ft. Climbed back up to 10000MSL and repeated this test on a reciprocal heading.
Results: Glide ratio varied from 9.0 to 8.0. The higher was observed at higher altitudes, as would be expected. Glide ratio fluctuated +/- 0.3 throughout the test, probably due to my failure to completely control air speed and the vagueness of GPS calculated (non-WAAS) altitude.
Any difference in glide ratio with the prop idling versus the prop stopped was below the noise error of my readings (<0.3).
Conclusion: At the slow speeds likely to be encountered during an engine out scenario in a CH600/700 series a stopped prop does not produce significant drag.
See http://www.whiteantelopesoftware.com/zodiac/perform.htm for other performance figures/details on this plane.
-Bruce/601HD/TDO/Stratus/496 hrs
Bruce Bockius
Black Forest, Colorado, USA
bruceb(at)WhiteAntelopeSoftware.com (bruceb(at)WhiteAntelopeSoftware.com)
http://www.WhiteAntelopeSoftware.com/zodiac/
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raymondj(at)frontiernet.n
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| Posted: Sun Jul 23, 2006 7:53 pm Post subject: CH601HD performance with prop stopped |
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Thanks for some EXPERIMENTAL DATA !!!!! Nice web site.
Raymond Julian
Kettle River, MN
Corvair core acquired
[quote] --
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