Spit IIa is now so much more inferior to the 109

[Ernst]

Originally Posted by Kwiatek

Yep it is also interesting

Are the SPITFIRE FMs at UP 3.0 RC4 yours?

[Crumpp]

The power figures on the engine Inspection and Test Certificate come from "test bed conditions", either at RR, RAE or the dynamometer at AAEE, i.e. the engine wasn't even mounted in an airframe and the engine surely wasn't running at 12,500 feet without an airframe.

Sure it was running at 12,500 feet on an altitude test stand.

[Crumpp]

I checked the June 1941 edition. It doesn't contain any general statement that aircraft or engine limitations are allowed to be exceeded. It does however explicitly state that the over-ride for the boost control of "an engine normally rated for [...] 87 otane fuel" "may be used only if 100 octane fuel is in the tanks."

Let's see the whole publication because they do not match at all. Either the warning about 100 Octane is a technical update added at a later time or it is not from the same document.

The 1937 Training Manual makes no such distinction about 100 Octane fuel.

[NZtyphoon]

Originally Posted by Crumpp

Let's see the whole publication because they do not match at all. Either the warning about 100 Octane is a technical update added at a later time or it is not from the same document.

The 1937 Training Manual makes no such distinction about 100 Octane fuel.

Yup and let's see your 1937 Training manual and the context in which it mentions boost over-ride, because so far we've seen nothing of it, just your description.

[41Sqn_Banks]

Originally Posted by Crumpp

Let's see the whole publication because they do not match at all. Either the warning about 100 Octane is a technical update added at a later time or it is not from the same document.

Of course it is not the same document, as said it's from the 1st edition. If you read the preface of the 2nd edition you will notice that it has been "revised and rearranged in convenient order and grouping". That's why they are not comparable.



This is the whole page where the 100 octane limitation was taken from.
http://forum.1cpublishing.eu/attachm...0&d=1334727256
http://forum.1cpublishing.eu/attachm...1&d=1334727263

And it's perfectly in line with the 100 octane limitations of various Merlin engine manual from January 1939 to November 1940:

January 1939: http://forum.1cpublishing.eu/attachm...0&d=1334682385
April 1940: http://www.wwiiaircraftperformance.o...erlin3-pg6.jpg
March 1940: http://www.spitfireperformance.com/ap1590b.jpg
November 1940: http://forum.1cpublishing.eu/attachm...5&d=1337196053

These are several other quotes from the 1st edition of Pilot's Notes General.
http://forum.1cpublishing.eu/attachm...4&d=1334772058
http://forum.1cpublishing.eu/attachm...8&d=1334956606
http://forum.1cpublishing.eu/attachm...6&d=1335714870
http://forum.1cpublishing.eu/attachm...2&d=1326733398

I'm sorry, I do not intend to provide a whole digital copy, it's a very rare item. Not sure if The National Archives has one and I've never seen it somewhere else. You can PM me if you have something pleasurable to offer as an exchange.

[Kwiatek]

Originally Posted by Ernst

Are the SPITFIRE FMs at UP 3.0 RC4 yours?

Probably not my FM's ( for 109s, Spits, Fw 190s, P-51 etc) was up to UP 2.X versions.