Shortround6
Major General
DB 606
I don't know what size props the DB 601 engines in the HE 111P used but the HE 111H used 3.5 meter props on the Jumo 211.
The Bomber engines used different reduction gears to suit the different propellers. Merlins used different reduction gears on bomber and transport aircraft to suit the airframes rather than trying to use fighter propellers.
The 3% different in drag is from an old William Green book /chapter on the He 177. It could be in error.
The "bolted together" W engines were always going to have packages difficulties compared to a single crankcase engine.
I would be a little leery of using maximum "box" dimensions as they can be sometimes misleading. A lot of engines had a few lumps and bumps that added to the basic structure of the engine and it many cases, were a number of feet back from the front of the engine. Yes, they 'counted' for the square feet of the frontal area but but by the time the cowl fastened on some of these lumps and bumps disappeared into the contour of the cowl.
BTW the square ft of a normal seated male is just over 7 sq ft and that is counting only 525mm (under 21in) of width. Germans did reduce the height by angling the legs out but most cockpits are going to exceed the frontal area of most inline piston engines.
I don't know what size props the DB 601 engines in the HE 111P used but the HE 111H used 3.5 meter props on the Jumo 211.
The Bomber engines used different reduction gears to suit the different propellers. Merlins used different reduction gears on bomber and transport aircraft to suit the airframes rather than trying to use fighter propellers.
The 3% different in drag is from an old William Green book /chapter on the He 177. It could be in error.
The "bolted together" W engines were always going to have packages difficulties compared to a single crankcase engine.
I would be a little leery of using maximum "box" dimensions as they can be sometimes misleading. A lot of engines had a few lumps and bumps that added to the basic structure of the engine and it many cases, were a number of feet back from the front of the engine. Yes, they 'counted' for the square feet of the frontal area but but by the time the cowl fastened on some of these lumps and bumps disappeared into the contour of the cowl.
BTW the square ft of a normal seated male is just over 7 sq ft and that is counting only 525mm (under 21in) of width. Germans did reduce the height by angling the legs out but most cockpits are going to exceed the frontal area of most inline piston engines.