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Author Topic: German WW2 fighter 5 and 6 blade propellers  (Read 333 times)

Offline Würger

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German WW2 fighter 5 and 6 blade propellers
« on: April 08, 2019, 06:22:05 am »
Not mentioning several contra-rotating experiments (e.g. the Junkers VS23 intended for the BMW 803), Junkers at Dessau and VDM at Frankfurt developed 5 blade propellers taking in mind especially the Jumo 222. Even a 8 blade propeller (not contra-rotating) was considered to be used on the 36 cyclinder Jumo 225 ("Flugmotoren und Strahltriebwerke").
The firm LGW (a Siemens subsidiary) was asked by the O.K.L. in late 1944 or early 1945 to produce a speed regulated synchnizing device/contactor permitting controlled firing through five and six bladed propellers. This was obviously for fighters, but which one(s)?
This data is taken from "Ott-Helmut von Lossnitzer, Technical Director of the Mauser Company 1933-1945", particularly from a report made by Dr.-Ing. habil. Remt Poppinga on "Electric Ignition of Aircraft Weapons".

Offline Basil

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Re: German WW2 fighter 5 and 6 blade propellers
« Reply #1 on: April 11, 2019, 12:33:42 am »
Hi Würger,

I do not know either.
But as you already mentioned the book "Flugmotoren und Strahltriebwerke" - page 294 describes the He (DB) S 021 turboprop engine in detail and also a variant with a relatively small 6-bladed propeller (with a high propeller disc loading like a propfan). Perhaps this propeller was also planned for the use on the Focke Wulf PTL fighter which had a proposed armament of 2 MG 213 firing through the propeller disc (besides a MK 103).

Propeller development at the end of the war is especially interesting with research in curved propfan-like blades.

Offline Würger

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Re: German WW2 fighter 5 and 6 blade propellers
« Reply #2 on: April 14, 2019, 09:10:39 am »
Basil,
 it could be for a turboprop but, as the book also States, the "Flitzer" would have just four propeller blades. There' s still a lot to know.