Speed graphs for Spitfire and Hurricane

[Kurfürst]

Originally Posted by Kwiatek

I translated there is not information about confirmed lower power output but only about correct mainfold pressure, temperature and not guarantee engine power - nothing more. No info about lower power output.

Ok, so we have established that your tests were not corrected for nominal engine outputs, and therefore, irrevelant as we do not know what powers were developed during the tests.

Hint: We know exactly in the case

Exacly that why it looks that V15 prototype didnt used variable hydraulic supercharget but only 2 position one. With variable supercharger speed polars will be much more smooth.

Problem is, you do not seem to understand how the hydraulic coupling the DB 601 works. It has two oil pumps, one constant supply (fixed speed, MS, thats the first "straight" line up to around 2000 m in the power curves), one variable supply to set the amount of slip (speed of supercharger) via oil pressure. You can set the second one for full oil delivery, and voila, it operates exactly like a fixed speed supercharger with two fixed ratio gears.

Please - Your own site:

http://kurfurst.org/Performance_test...w_109V15a.html

" It appears that variable-speed hydraulic supercharger control was either not present or not engaged in the tests (ie. testing seperately with both supercharger gears) : low-altitude and high-altitude supercharger speeds were engaged at a given boost pressure, therefore the curves do not show the characteristic shape of the DB power curve - this would result in a more smooth,curved transition and improved in performance between the supercharger`s two critical altitudes (ca between 2200 and 4800m) in level flight."

Well you just have to read it now I think... I have bolded it out for ya.

Again for prototype V15 and German prospect not FOR SERIAL PRODUCTION plane. Nothing knew. I would like to see such speeds for serial planes.

Again I suggest you read the conditions of the airfame for the V15. Its the same as the serial production airplane.

As for the speeds for serial production planes, it can be read here. 500 km/h at SL.
http://kurfurst.org/Performance_test...chreibung.html

Suorce? I dont see any information about these.

As we know serial production 109 E had variable hydraulic supercharger so how and for what would like to disable MS gear????

I do not know. "Disabling" the MS gear is easy - you just have to set the barometric control so that the second oil pump in the hydraulic coupling operates at maximum delivery, and voila, the hydralic coupling operates now at minimum slip and maximum supercharger speed.

As noted, G-6 tested at Rechlin shows the same. I suppose more accurate figures can be collected.

Maby Germans, Frenchs, Swiss and Americans made phone call and decided to blocked MS gear in their 109 for test?

The French definietely did not, but they got similar results to the V15 trials.

The rest is plainly in the files. Both V15 trial and the US trial show that they tested both in MS and FS gear. The Swiss is a bit of a guesswork, but then explain me:

a) Why did the Swiss get a straight curve instead of a curved one, ie. a characteristic feature of the DB's barometric control, *when engaged*
b) Why did the Swiss get a result exactly like the Germans in V15 trials while using the Hohenlader (FS gear).

Again totally bulshit for me and not confirmed anywhere.

Well again the Swiss tests show exactly the same results as WNr 1774 tests in MS gear. Mere coincidence? I don't think so. No less than 35-40 km/h difference between planes? I do not think so either.

Please translate the text below, then explain how it is different from the "serial production" E-1. Especially the Motorhaube noch roh, Rückstoßer oben unverkleidet part.

An Bf 109 V 15 a, der Mustermachine für die E-1-Serie, wurden die Geschwindigkeitsleistungen erflogen. Aus Zeitmengel konnten nicht die günstigen Rückstoßer
und Ansaughutzen erflogen werden, sodaß evtl. noch Leistungssteigerungen möglich sind.

Zustand des Flugwerkes. Oberfläche : serienmäßiger Anstrich, Motorhaube noch roh, Rückstoßer oben unverkleidet. 2 Flügel- und 2 Hauben-MG eingebaut. Eindrahtantenne. Fahrwehr eingezogen, Sporn außen.