I'm calculating the change to Cdo as a result of increasing the engine sizes on a twin piston engined aircraft. The change to basic equivalent flat plate area is simple enough using the increase in nacelle area and the appropriate factor. However there is another consideration, ie increased cooling drag for larger engines. Can anyone point me in the right direction for appropriate factors modifying crosssectional intake area to get the change in fpa for cooling drag?
Your hep appreciated,
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