Ideal Luftwaffe starting 1/1/1936

[tomo pauk]

The Siemens-Halske company was offering 9 cyl radials in late 1920s/early 1930s, the Sh 20 was making 540 PS for take off, weight 415 kg, or 475 kg (with gearbox?). Sh 22 B was making 650 PS on 490 kg.
With all said, seems that Germans did have quite a choice of under 700 PS engines. Especially once the foreign factories are captured.

 

[rinkol]

Indeed, the LR MPA must be used to find out convoys and dispatch the acquired data to the subs. The Jumo diesels (204, 205, 207, 208 ) did indeed use only 6 cylinders, but also 12 pistons - each cylinder was shared by two opposing pistons.
The Jumo 208 was being developed from 1939, it featured different cylinder dimensions (bore increased from 105 to 130 mm), hence the volume was increased from 16.6L to 25.5 L. I don't know the weight. Power was 1500 PS for take off, 1100 PS was Steig Kampfleistung at 10000 m through use of turbocharger. Engine remained in prototype stage.
From 1940, another diesel was tested, the Jumo 223. A 24 cylinder engine - with 48 pistons!? Due to small cylinders (80mm bore, stroke 2 x 120 mm), the permissible RPM skyrocketed at 4400 rpm, the power was at 2500 PS for take off. The engine weight went also considerably up, at 1400 kg (with turbo?). Remained at prototype stage. Cylinder layout was similar to the Napier Deltic, but with 4 cylinder blocks, rather than 3. A 'diamond' layout, we might say.

I'm mystified as to why they didn't use three sets of Jumo 207 cylinder blocks in a triangular layout (i.e., the same general configuration as the Napier Deltic) for the Jumo 223. Surely, this would have saved a lot of development effort.

 

[Shortround6]

Or maybe not

See: Napier Deltic - Wikipedia, the free encyclopedia

 

[tomo pauk]

Maybe 3 sets of Jumo 204 (as the Deltic) or 205 cylinder blocks? 2500 PS on 1800 kg?
BTW, Continuing a development of 28.5 L diesel (Jumo 204), instead of going for a considerably smaller 16.6L (Jumo 205) would be a better proposal both on the on the short and long run?

 

[rinkol]

Or maybe not

See: Napier Deltic - Wikipedia, the free encyclopedia

The material about the piston phasing is interesting - it just goes to show how easy it is to overlook these sorts of engineering issues.

 

[tomo pauk]

...
The Germans might have done better to build more/better small utility transports than spending the time and effort that they spent on "trick" aircraft.

Wonder if something akin the An-2 'Colt' would've been good for the German war effort - a non-nonsense transport biplane with 1000 HP engine?

 

[wiking85]

Wonder if something akin the An-2 'Colt' would've been good for the German war effort - a non-nonsense transport biplane with 1000 HP engine?

Certainly couldn't hurt. Also it would have been a fine airplane for paras and VIPs.