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

[41Sqn_Banks]

Originally Posted by lane

That's interesting. Can you please share a scan if possible and convenient? Thanks.

[lane]

Originally Posted by 41Sqn_Banks

Thanks 41Sqn_Banks!

[NZtyphoon]

24 September 1938:

Sir, I am directed to inform you that in order to improve the take off performance of Spitfire aircraft, the use of 100 octane fuel by squadrons equipped with this type has been approved.

2. Improvement in the take off performance of Hurricanes will be obtained by the use of C.P airscrews but there will be a period of some months before this modification will be introduced...

The report goes on to explain that 100 octane was useful as a means of improving take off power, particularly with the Hurricane on some airfields, and the operational limits in Merlin engines would have to be strictly observed. This is evidence that the adoption of 100 octane was well underway nearly a year before the war started albeit its use was temporarily restricted as a measure to improve take off performance; this was also before increased boost pressures were adopted.

[41Sqn_Banks]

The Operational Notes for Pilots on Merlin II and III from January 1939 fit that time frame and are an good indicator for the restrictions at that time.

http://forum.1cpublishing.eu/attachm...0&d=1334682385

[lane]

Originally Posted by 41Sqn_Banks

The Operational Notes for Pilots on Merlin II and III from January 1939 fit that time frame and are an good indicator for the restrictions at that time.

http://forum.1cpublishing.eu/attachm...0&d=1334682385

Good one 41Sqn_Banks, thanks again!

[lane]

Reality check...

100 Octane Fuel - Issue of., 12th December, 1939
A.P.1590B/J.2-W, Merlin II and III--Use of +12 lb./sq.in. Boost Pressure--Alterations, 20 March 1940
Emergency +12 lbs./sq. in. Boost Operation: Pilot's Notes, Merlin II, III and IV, 4th Edition, April 1940, page 6.
Air Chief Marshal H.C.T. Dowding, Handling of Merlin in Hurricane, Spitfire and Defiant Aircraft, 1st August, 1940

56 Squadron Combat Report, 9 May 1940: twelve boost
S/L J. O. W. Oliver, 85 Squadron, 10 May 1940: pulled the plug
F/O Paul Richey, 1 Squadron, 11 May 1940: boost-override pulled
F/O E. J. Kain, 73 Squadron, 14 May 1940: pulling his boost cut out
P/O D. W. A. Stones, 79 Squadron, 14 May 1940: pulled out the emergency boost-plug
Sgt. R. C. Wilkinson, 3 Squadron, 14 May 1940: 12 P.S.I.
P/O R. P. Beamont, 87 Squadron, 15 May 1940: I pulled the tit'* for over-boost... *Emergency boost over-ride on the Merlin engine
P/O F. B. Sutton, 56 Squadron, 18 May 1940: I had to pull the tit... Emergency boost control giving extra power
F/Lt. I. R. Gleed, 87 Squadron, 18 May 1940: pull the tit *; a jerk as my supercharger goes up to twelve boosts
P/O John Bushell, 151 Squadron, 18 May 1940: I used full 12 lb boost (pulled the plug)
S/L E. M. Donaldon, 151 Sqdn., 18 May 1940: I pulled the plug and climbed at 10 lbs boost
F/O C. F. G. Adye, 17 Squadron, 18 May 1940: pulled emergency boost control
F/O C. F. G. Adye, 17 Squadron, 19 May 1940: pulled emergency boost
F/Lt. I. R. Gleed, 87 Squadron, 19 May 1940: Here goes with the tit. A jerk - the boost's shot up to twelve pounds
Sgt. L. H. B. Pearce, 79 Squadron, 20 May 1940: Pulled tit
P/O John Freeborn, 74 Squadron, 24 May 1940: boost cut-out
P/O Colin Gray (NZ), No. 54 Squadron, 25 May 1940: I pressed the emergency boost tit
P/O Colin Gray (NZ), No. 54 Squadron, 25 May 1940: +12 lbs.
P/O Al Deere, No. 54 Squadron, 26 May 1940: 12 boost
F/LT Brian Lane, 19 Squadron, 26 May 1940: automatic boost cut-out
F/LT Brian Lane, 19 Squadron, 26 May 1940: 12 lb. boost
Sgt. J. C. Harrison, 229 Squadron, 28 May 1940: I pulled the emergency boost
P/O K. B. McGlashan, 245 Squadron, 28 May 1940: We’d boost an extra four pounds, from eight to twelve
P/O C. M. Simpson, 229 Squadron, 29 May 1940: with boost out and pulled
P/O T. D. Welsh, 264 Squadron, 29 May 1940: pulled boost cut-out
F/Sgt. G. C. Unwin, 19 Squadron, 1 June 1940: 12 Boost
Sgt. P. Ottewill, 43 Squadron, 1 June 1940: automatic boost cut-out pulled
P/O M. P. Brown, 611 Squadron, 2 June 1940: opened the boost cut-out
F/O D. H. Watkins, 611 Squadron, 2 June 1940: emergency boost
F/Lt. John Webster, No. 41 Squadron, 19 June 1940: 12 lbs boost
F/Lt. R. G. Dutton, 145 Squadron, 1 July 1940: pulled the plug
P/O G. Page, 56 Squadron, July 1940 "Pulling the "Tit"*... *An emergency knob for supplying additional power to the engine.
F/Lt D. P. Kelly, 74 Squadron, 28 July 1940: boost cutout
F/Lt. John Webster, No. 41 Squadron, 28 July 1940: 12 boost
F/Lt. John Webster, No. 41 Squadron, 28 July 1940: twelve boost
P/O George Bennions, 41 Squadron, 28 July 1940: emergency boost
P/O Art Donahue, 64 Squadron, 5 August 1940: emergency throttle
F/Lt. John Webster, 41 Squadron, 8 August 1940: 12 boost
F/O R.W. Wallens, 41 Squadron, 11 August 1940: 12 lbs boost
Composite Combat Report, 41 Squadron, 15 August 1940: 12 lbs boost
P/O Jeffrey Quill, 65 Squadron, 12 August 1940: boost control cut-out
F/Lt A. C. Deere, 54 Squadron, 12 August 1940: 12 Boost
F/Lt George Gribble, 54 Squadron, 15 August 1940: 12 boost
F/Lt Robert F. Boyd, 602 Squadron, 18 August 1940: My Spitfire easily outdistanced Me 109's at 10 lbs boost 2800 r.p.m.
P/O G. E. Goodman, 1 Squadron, 18 August 1940: pulled the plug
F/O D. H. Watkins, 611 Squadron, 21 August 1940: emergency boost
P/O James Morton, 603 Squadron, 28 August 1940: pressed the tit
P/O Wicks, 56 Squadron, 30 August 1940: emergency boost
P/O Ronald Berry, 603 Squadron, 31 August 1940: press the emergency boost
P/O Colin Gray (NZ), No. 54 Squadron, 31 August 1940: emergency boost
Sgt Jack Stokoe, 603 Squadron, September 1940: pushed in boost override
P/O Roger Hall, 152 Squadron, 4 September 1940: pushed the red half-lever forward
F/O Robert Oxspring, 66 Squadron, 6 September 1940: emergency power
P/O J. R. B. Meaker, 249 Squadron, 6 September 1940: pull the plug
P/O R. D. Elliott, 72 Squadron, 9 September 1940: MAX Boost (12 lbs)
F/Lt J. A. Kent, 303 Squadron, 9 September 1940: I pulled the boost override plug
P/O T. F. Neil, 249 Squadron, 18 September 1940: Plug pulled
F/O Brian Macnamara, 603 Squadron, 27 September 1940: In fine pitch, with full throttle and the red lever pressed
P/O R. G. A. Barclay, 249 Squadron, 27 September 1940: automatic boost cutout
P/O Bob Doe, 234 Squadron: I would 'pull the plug', which was the release so that we could get extra boost
Geoffrey Wellum, 92 Squadron: Press the emergency boost override.
P/O David Crook, 609 Squadron, 30 September 1940: 'pulled the plug', i.e. pushed the small handle on the throttle quadrant that cuts out the automatic boost control thus allowing one to use emergency power
P/O K. W. MacKenzie, 501 Squadron, 5 October 1940: tit pulled for absolute full power
S/L A. A. McKellar, 605 Squadron, 7 October 1940: pulled my boost control
F/O D. McMullen, 222 Squadron, 15 October 1940: 12 boost

[lane]

56 Squadron Combat Report, 9 May 1940



S/L J. O. W. Oliver, 85 Squadron, 10 May 1940


F/O Paul Richey, 1 Squadron, 11 May 1940


F/O E. J. Kain, 73 Squadron, 14 May 1940


P/O D. W. A. Stones, 79 Squadron, 14 May 1940


Sgt. R. C. Wilkinson, 3 Squadron, 14 may 1940


P/O R. P. Beamont, 87 Squadron, 15 May 1940


P/O F. B. Sutton, 56 Squadron, 18 May 1940


F/Lt. I. R. Gleed, 87 Squadron, 18 May 1940


P/O John Bushell, 151 Squadron, 18 May 1940


S/L E. M. Donaldon, 151 Sqdn., 18 May 1940

F/O C. F. G. Adye, 17 Squadron, 18 May 1940

F/O C. F. G. Adye, 17 Squadron, 19 May 1940

F/Lt. I. R. Gleed, 87 Squadron, 19 May 1940


Sgt. L. H. B. Pearce, 79 Squadron, 20 May 1940


P/O John Freeborn, 74 Squadron, 24 May 1940


P/O Colin Gray (NZ), No. 54 Squadron, 25 May 1940


P/O Colin Gray (NZ), No. 54 Squadron, 25 May 1940


P/O Al Deere, No. 54 Squadron, 26 May 1940


F/LT Brian Lane, 19 Squadron, 26 May 1940


F/LT Brian Lane, 19 Squadron, 26 May 1940


Sgt. J. C. Harrison, 229 Squadron, 28 May 1940


P/O K. B. McGlashan, 245 Squadron, 28 May 1940


P/O C. M. Simpson, 229 Squadron, 29 May 1940


F/Sgt. G. C. Unwin, 19 Squadron, 1 June 1940


Sgt. P. Ottewill, 43 Squadron, 1 June 1940
http://www.wwiiaircraftperformance.o...ll-1june40.pdf

P/O M. P. Brown, 611 Squadron, 2 June 1940


F/O D. H. Watkins, 611 Squadron, 2 June 1940


F/Lt. John Webster, No. 41 Squadron, 19 June 1940