Recent content by Keke

Some techical data from the engines: For Wright R-4090 you can find some data here: http://www.enginehistory.org/ModDesig/I5 9.tif Armstrong-Siddeley Deerhound (source wikipedia) Projected engines in 1935-1941, only prototypes build. Sole modified Armstrong Whitworth Withley is used as...

In first, I though same way, but I find theoretical difference between rammed/static situation in same altitude with same MP. Correct me, if I am wrong. In ramming air situation air pressure in a intake of supercharger is higher than static situation, so supercharger don’t need make work so...

Kurfürst, best explanation this far... It could be static/rammed values. And many thanks for all those great documents, that you have posted here. Regards Keke

Nice guess, Aaron but I think that they are not WEP figures. If these double values is only on take-off and 5 min. level flight power figures I could agree you, but this is also in max. cruising values and I haven't seen any usable of water/metanol injection at cruising. If my collected...

In many british documents I have seen two different values for engine power ratings in same contitions. For example (Flight: Feb. 16, 1939, in table page 155) : Bristol Perseus XIIc: Max. cruising: + 1.25 lb./sq.in., 2,250 rpm. 655/685 B.H.P @ S.L. Max. climbing + 1.25 lb./sq.in...

IMHO, it's not so easy. If radial engine get hit and can still run, it breaks lack of oil sooner or later (probably sooner). Also radials has bigger frontal area to hit. As you write, jets has a disadvantage for it's vulnerability, but it has a low frontal area, so more difficult to hit direct...

Sorry, but I have heard that Bf 109 V1 was engined with Rolls Royce Kestrel IIS, not Merlin. OK, English V-12 anyway :lol:

It was a very difficult question, because: * In US was probably best factories and very good sources of materials. Also US has had a very nice radial engines and using of turbo supercharger has had great influence. * In England was very good inline engines and sleeve valve radials, but had a...

I my opinion there is too many aspects for only one correct answers that question. Aspect for radial: ++ air cooled, so no leaking coolant + could produce power some time even a some missing cylinders -- big frontal area for inline: + medium frontal area + one bullet can't cause instant...

I found some information from AEHS web side: http://www.enginehistory.org/Carbs/CarbApps_05.xls NOTE: It is EXCEL file. According to Pete Law and Robert Mawhinney, who was collected that large excel file usage of carburetors, PD-12-K10 with part no 395641 is used on R-1820-56 as a service...

Some information of Hispano-Suiza 12Y-31 and Klimov M-103/M-105 found in Helsinki university library. - Sorry in finish. http://digi.lib.helsinki.fi/pienpainate/secure/showPage.html?action=pdf&id=346031&conversationId=1 For other way to find the document: Go to Kansalliskirjasto -...