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Old 09-24-2001, 04:28 PM
Richard T Eger Richard T Eger is offline
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This page presents some very nice notes on technical and operational aspects of second world war aircraft, with primary focus on German aircraft of world war II. The page address is:

http://w1.1861.telia.com/~u186104874/luftwaffe.htm

Currently, only one topic has been covered, the Daimler-Benz DB 605. This topic can be found at:

http://w1.1861.telia.com/~u186104874/db605.htm

The DB 605 page covers:

Introduction
Basic technical aspects of the DB 605
A note on the supercharging system
Performance charts with comments
Comments
Comparison with two-stage Merlins
Appraisal of a partnership: the DB 605 powered Me 109G and K

Regards,
Richard
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Old 02-20-2004, 12:32 PM
Richard T Eger Richard T Eger is offline
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From 12 O'Clock High!:

Nonny
For Lack of Octane
Thu Jan 29 18:45:20 2004
217.132.188.196

This from an article on the Merlin. Why exactly were the reasons the Germans were unable to increase their Octane ratings? Were they aware of Octane?

http://www.nationmaster.com/encyclopedia/Merlin-engine


"Most of the upgrades to the Merlin were the result of ever-increasing octane ratings in the aviation fuel available from the US, and ever more efficient supercharger designs. At the start of the war the engine ran on the then-standard 87 octane aviation spirit and could supply just over 1,000hp from its 27 litre displacement (compared to 1,100hp from the 34 litre DB 601).

The next major version was the XX which ran on 100 octane fuel. This allowed it to be run at higher compressions, which was achieved by increasing the "boost" from the supercharger. The result was that the otherwise similar engine delivered 1,300hp. This process continued, with later versions running on ever-increasing octane ratings, delivering ever-increasing power ratings. By the end of the war the "little" engine was delivering over 1,600hp in common versions, and could deliver over 2,000hp for brief periods in some versions.

In comparison the Luftwaffe had no similar ability to increase octane ratings, and had to continually introduce larger and larger engines to keep up. The result was that their planes had considerably worse power-to-weight ratios than the Merlin powered planes they faced, and the continual complete change in engines designs meant they never had enough to go around. The lack of engines was one of the major problems for the Luftwaffe, from the mid 1930's right until the end of the war."
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Old 02-20-2004, 12:34 PM
Richard T Eger Richard T Eger is offline
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From further within the thread on TOCH!:

Ruy Horta
Re: For Lack of Octane
Fri Jan 30 13:59:37 2004
213.160.199.19

Check this site:

http://w1.1861.telia.com/~u186104874/db605.htm

Ruy
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Old 02-20-2004, 12:34 PM
Richard T Eger Richard T Eger is offline
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From TOCH!:

Jukka Juutinen
Site
Fri Jan 30 18:56:11 2004
213.28.164.160

That site has interesting info but has some mistakes as well. For example, it claims that later DB 605D was capable of better performance at low altitude than the Merlin. This in untrue since 100 srs Merlin with ADI was capable of over 2200 hp, i.e. 10% more than the 605D. The Allison V-1710-143 was also capable of about 2250 hp at low level. And at higher up, standard late production V-1710-111/113 (as in P-38L) is capable of 1725 hp at 25,000 ft, 605D doing about 1300 hp at the same altitude, according to page 25 in the JaPo book on the Bf 109K.
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Old 02-20-2004, 12:35 PM
Richard T Eger Richard T Eger is offline
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From TOCH!:

Ruy Horta
Re: Site
Fri Jan 30 21:10:36 2004
194.109.243.112

The site isn't perfect, its just a general overview, but it addresses some of the remarks that were mentioned in the previous post. Frankly these discussions are not my cup of tea, so to speak.

Ruy
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Old 02-25-2004, 12:15 PM
Richard T Eger Richard T Eger is offline
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From 12 O'Clock High!:

Ulrich M. Frederiksen
umf@adslhome.dk
Daimler-Benz DB 605
Wed Feb 4 01:03:33 2004
80.164.1.235

Hello,
A few years ago I wrote an article on the DB 605. Reading Jukka Paukkinens article on "109 myths" spurred me to brush the original article up a little. There's still unanswered questions. If your are interested please read it and feel free to comment. You'll find it at http:/home20.inet.tele.dk/umf/db605NY.htm.
Thanks
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