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Kevin - my POH doesn't show anything above 12,000 as far as TAS at higher altitudes so don't have a book number. I was not keeping written records so it comes from memory pretty much and I may be a little optimistic about 150K TAS but my groundspeed dropped off very little from 11,500 to 15,500 (very slight wind effect difference.) I was at least 10% under gross. I'm going back later this summer and will do a little more scientific study.
Incidentally I climb at the top of the green (2600) but cruise at 2450. Climbing at 2800 might have a significant effect as would cruising at 2600.
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05-28-03, 03:45 PM
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