Can anyone help provide the following information:
Diameter of front part of the engine cowling and number of gills/cowl flaps fitted on the above types.

The cowl flaps could number 14 but it's difficult to prove as most photographs of BOAC & Scottish Airlines aircraft were taken at eye level.



The CAF's B-24A appears to have a different arrangement with the exhaust pipes projecting out near the top of the cowling.