PPRuNe Forums - View Single Post - How to calculate top speed of an aircraft
Old 30th Oct 2015, 11:36
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Pace
 
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Clearly these are not enough. The most obvious missing item is some drag value, something that will account for the shape of the fuselage/empannage, in other words aerodynamic properties of the airplane as a whole. MTOW and wing profile aren't enough
.

I am not a mathematician but there are so many variables its is surely a fairly pointless exercise and one which even the manufacturers get wrong.
i am thinking of the original claims of the diamond twin Star which were way off the claimed performance.

Even two PA28s will be different as power and drag are so variable. How good is the engine, the prop? Is the aircraft rigged the same? are there bugs or dirt on the airframe? are there dents on the airframe and a whole lot of other factors?

Pilot technique? Trimming onto the step?

weather conditions, temperature altitude etc

what are you trying too achieve?

Pace
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