Speed graphs for Spitfire and Hurricane

[Kurfürst]

Originally Posted by Kwiatek

Where you find it that there is lower engine outputs???

It says there, right in the documents you have posted. Please translate, for all.

Originally Posted by Kwiatek

In these documents - German documents there is clearly 1.3 Ata and 1/4 radiator open. And these is serial production planes.

Actually, none of them are serial production planes. The two planes you have posted are pre-production planes for a batch of 14. And they are exactly identical to WNr. 1774.

From where you get these about MS or FS gear???

It says right there, Bodenlader, Hohenlader. MS gear, FS gear.

109 E had hydraulic supercharger which surly was not used in V15 prototype nothing more.

Source please.

BTW some G-6s tested at Rechlin show the same pattern. The 109s hydraulic supercharger could operate in MS or FS gear, if it is set so.

I would really like to see your speed charts for SERIAL 109 E which confirm these beacuse until now i didnt saw any.

Here, again:



And this is the official specification for 109E, guaranteed within +/- 5% by the manufacturer.

But for contatry i saw many which show 467-475 km/h not more.

We have already discussed this. The tests you have posted are probably done in FS gear, which yields less performance than MS gear near SL.

For prototype 109 V15 yes with no hydraulic supercharger.

Source for no hydraulic supercharger please.

But next serial production 109 E tests speed didnt copy these.

Especially as there was never any DB 601 w/o a hydraulic supercharger..

Moreover other county (Swiss, French, US) speed test for serial 109 E confirmed German test for serial planes.

We have discussed this. The Swiss trials, though no details are available, are comparing various propeller designs, and are again likely at FS gear.

The French tests actually closely agree with the nominal specs, the French themselves state it so.

The US test, of which's conditions we know absolutely nothing, did not test SL speed at all - they did not measure speed below 12 000 feet - there's no data point there marked... it's just a rough extrapolation. Oh, and just for the record, the US tests also seem to have measured both FS gear and MS gear. They measured ca. 335 mph at 12 000 feet (540 kph at 3657 m), that's pretty much the same the Germans measured in FS gear on WNr 1174 / V15a.

I am curious why you did not post the testing details though. Testing details are very important, an open radiator can chop off 50 km/h from top speed, for example.

You alreay saw it page before. German documents from test speed for SERIAL planes not from one prototype and german prospect.

Oh. You mean the papers which are not corrected for guaranteed engine outputs, are likely done at the less optimal FS instead of MS gear, and were never meant to measure the absolute performance of serial produced aircraft but relative speed difference of various installations, and was not done on serial production aircraft if that's so important for you.