Radial engine/cowling diameters and external/internal drag

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spicmart

Staff Sergeant
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May 11, 2008
Are there data about the diameters of radial engines or their cowlings on the WW2 fighters respectively? For drag comparison.
And is their info about how to duct internal airflow to minimize drag? Which fighters did especially well?
 
Are there data about the diameters of radial engines or their cowlings on the WW2 fighters respectively? For drag comparison.
And is their info about how to duct internal airflow to minimize drag? Which fighters did especially well?

Getting the data about diameters of radial engines is easy. Much less so about the diameter of their cowlings.
The data about ducting designed so that the drag is reduced - not sure that I've ever read anything about that. Indeed, perhaps the NACA docs can help.
 
One of many NACA cowling papers:
The references listed will help you track down the rest.
 

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