altitude

altitude

<HTML>I noticed during Summer, with high density altitude, my plane would act at 3000 ft like you would expect at 7000 - had to apply more power to maintain altitude and lean out some for best performance. Is it correct to say that lower altitudes under certain conditions are comparable to high altitudes due to thinner air? It seems to me the prop would have to turn faster in thin (warm) air in order to displace the same amount of molecules per speed and the mixture would need to be leaner to be compatible with the available air. Is the difference in salt and fresh water a fitting analogy to this? One holds "altitude" easier in salt water - I'm told.</HTML>

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Re: altitude

<HTML>Your POH, if like mine, shows the effect of altitude on performance. Density altitude is changed by temperature and to a lessor extent by humidity. This not only effects the performance of the airfoils but also the power output of the engine. My strip is at 6100' and in the summer it is not unusual to see density altitudes around 10,000'. Safety requires density considerations.</HTML>

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Re: altitude

<HTML>The prop will turn at the same rate for the same Indicated airspeed but the TRUE airspeed will be higher for a given indicated at the higher density altitude.  This can lead to some surprise on landing and requires bigger allowances for landing/takeoff distances along with wider pattern legs.</HTML>

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