Inaccurate performance data for BOB fighters in COD comparing to RL data

[Crumpp]

You now want to claim that when pilots refer to pulling the plug it meant they went to 10.55 lbs boost on 87 octane fuel, right?

I am not claiming anything outside of known facts, NzTyphoon. I will leave the speculation to you.

The known facts are that system was in place before 100 Octane fuel was around as evidenced in the 1937 RAF training manual.

The Operating Notes will specify the authorized fuel for the aircraft. The type Operating Notes clearly state that "ALL Operational Units - 100 Octane" after the fuel is adopted for all operational units.

We don't see that in any of the Operating Notes during the BoB. Only the Spitfire Mk II carried the 100 Octane specification. The rest require replacing the heads and in some cases, rings as well as the required modifications to the fuel metering system. This work was performed at Service Inspection intervals. Do you know what that means?

[Seadog]

Originally Posted by Crumpp

The rest require replacing the heads and in some cases, rings as well as the required modifications to the fuel metering system. This work was performed at Service Inspection intervals. Do you know what that means?

The March 20 1940 memo clearly states that new built aircraft already had the internal engine mods:

http://www.wwiiaircraftperformance.org/ap1590b.jpg

Given the production numbers for Hurricanes/Spitfires and RAF operational and combat losses prior to the start of the BofB, it is extremely doubtful that any unmodded aircraft were still in front line service. Production during March, April, May and June, and July, of 1940 would have amounted to approximately 1500 Hurricane/Spitfire aircraft, or greater then RAF FC's front line strength at the start of the BofB.

The memo clearly establishes that all RAF FC Hurricanes/Spitfires were modded for Hundred octane fuel and 12lb boost prior to the start of the BofB.

[41Sqn_Banks]

Originally Posted by Crumpp

The known facts are that system was in place before 100 Octane fuel was around as evidenced in the 1937 RAF training manual.

So please tell us what there is written ... or at least tell us which chapter and paragraph.

This is from the Air Publication 129 Royal Air Force Flying Training Manual Part I - Landplanes; Revised June, 1940 (Reprint April 1941 incorporating A.L. No. 1), A.L. No. 2 from May 1941 is slipped in.

Chap. VII
Boost control

53. ... Some boost controls are provided with an emergency cut-out, which over-rides the automatic boost control. This must only be used in emergency and not, in any circumstances, for ordinary flying, because, even if the correct boost is not exceeded, the mixture enrichment is also put out of action and, as has been previously explained, high boost is only allowed with rich mixture, and without it may cause serious damage.