German January 1941 book on motorjet, turbojet, turbofan and turboprop engines

[mvdmitri]

Strahltriebwerke Rechlin Mappe

http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Rechlin Mappe.pdf

"Jet engines"
The Rechlin folder
1941

Rare hystorical testimony from the year 1941 from the Luftwaffe - Erprobungsstelle
in Rechlin.
Secret discussions with select third-tier scientists on the future and state of jet engine technology. As well as the recognized and expected problems. Early testimony from the year 1941 (January 31st) The folder is over 200 pages thick, good condition according to the age. - Many tables and photos.

Chapter:
1 Problems of engine design, especially for fast and long-haul flights
2 jet engines for fast airplanes
3 Basics for the assessment of jet engines
4 Comparison of stationary and periodic thrust
5 The role of the jet engine in aircraft construction
6 Special feature of the jet engines radial design
7 TL engines in axial design and engine air jet engine
8 The development of L engines at BMW-Spandau
9 Pre-development work on TL engines at BMW Munich
10 TL engine development at Junkers
11 twin-engine engines
12 deflagration jet


This book shows how far ahead was R&D on turbojet engines in Germany.


More technical reports are here:

Luftwaffe Cockpits

 

[P-39 Expert]

Fascinating, guess I'll need to brush up on my German.

 

[maxmwill]

Could you post some pictures? I'm interested in the proof of concept that Focke Wulf used to prove out the nose mounted turbine on the FW190TL, the FW44J that had the ducted fan mounted on the nose, as well as the intake of the DB-021. While My German is practically nonexistent, a photo is worth a literal 1,000 words.

 

[mvdmitri]

First link is has many links to drawings and graphs.
For example:
http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 7/5.JPG 12 cylinder two stroke 3350hp motorjet engine
http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 7/7.JPG turbojet engine
http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 7/8.JPG turbojet engine
http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 8/2a.JPG comparison between motorjet and turbojet.

http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 5/8.jpg experimental plane with two turbojets

http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 5/Aussprache 1.jpg Me 262 specifications 1
http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 5/Aussprache 2.jpg Me 262 specifications 2
http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/kapitel1/Bilder/Gross/05.JPG turboprop powerplant

http://www.deutscheluftwaffe.com/archiv/Dokumente/ABC/r/rechlin/Kapitel 7/1.JPG early motorjet design flight specifications


This book shows that R&D was started probably in early 1930s while others were still trying improve propeller power plants. Lack of refractory alloys delayed transition to jet engines, but this study also showed that they are superior at fly speed over 550 mph.

 

[maxmwill]

I was stupid. I failed to see the link to it just above, and, feeling a tad ashamed(happily, though, for obvious reasons outlined below), I clicked on it and dove into the book. While my Russian is far better than my German, and I'm functionally illiterate with respect to Russian, I was able to understand it well enough to kind of follow. And am gonna have fun reading this in the future, because even though there aren't any photos that I can use, I can still follow the development of the various jet engines outlined, including the Lorin type as well as the Argus pulsejets. I'm especially interested, now, in the further ducted fan development, especially using a DB604. Lots of whiffing possibilities.

One thing, though, I still can't find any other reference elsewhere concerning the BRAMO 325, a 14 cylinder radial used on the ducted fan Steiglitz. But then, such is the price of research, you have to keep picking at thread ends until something else gets pulled out.

 

[basil]

mvdmitri,

just for clarification regarding your posting #4:

- the motorjet is a BMW project P 3350; P means project, not horsepower (HP); it is doubtful that 15 liter displacement would achieve over 3.000 HP even as a turbocompounded two-stroke like here;
- the turboprop powerplant is special insofar that it utilizes an interturbine burner for high power requirement situations (take off, combat) - a concept that is reviewed by engine manufacturers from time to time even today.