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In a message dated 10/26/02 12:19:34 AM Eastern Daylight Time, [EMAIL PROTECTED] writes: > I am also noticing that with these cooler days that I am > getting more speed at cruise. During the summer > I was getting around 100 mph @ 2450rpm, now I get about 110 mph.GPS is > up as well so I am going > faster,(not just reading faster). There's a couple of things going on here. Colder, denser air allows the engine to produce more power and the prop and wings to produce more thrust and lift. All these contribute to better performance. In addition, the denser air makes the ASI read higher for a given true airspeed. On the other side, there's also increased drag due to the denser air. (That's why true airspeeds are higher at altitude for a given indicated airspeed). Corelating a GPS reading to IAS is problematic due to the difficulty of accounting for winds aloft. Many folks think that if they fly two legs at opposite headings, the average is the true ground speed. Not true. this only works if one leg is directly into the prevailing wind and the other is directly away. I think this url will get you to a calculator that can figure true airspeed from 3 legs: http://www.reacomp.com/index.html?true_airspeed/index.html > Avemco was the only insurance company that would insure me > & my 2 partners when we tried to > get quotes. Now they are no longer providing aircraft insurance in > Canada. ... Does anyone have any > idea why they have done this? > Wild guess: Money. John ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm
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