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

[NZtyphoon]

Originally Posted by TomcatViP

In the series of " What archives tells us" here is the FLIGHT archives that I cited two days ago :

- There was no 100 octane fuel usage during BoB in the FC. Here I am putting my money on British pride that would hve pushed forward any of its usage (ok Brits are not French but never the less )

Sources : (http://www.flightglobal.com/pdfarchi...0-%201286.html)

1. "International power of the Merlin I and II was 950/990 h.p. at
2,600 r.p.m. at 12,250ft, and the maximum take-off output was
890 h.p. at 2,850 r.p.m."

2. Merlin III : "The power output of the standard engine,"
writes Harold Nockolds, "was 1,030 b.h.p. at 3,000 r.p.m. at
10,250ft with plus 6i lb boost. "

3. "the petrol normally used at that time was 87
octane"

What Mr Tomcat conveniently left out:
1. "International power of the Merlin I and II was 950/990 h.p. at 2,600 r.p.m. at 12,250ft, and the maximum take-off output was 890 h.p. at 2,850 r.p.m."

The 1938 Flight article http://www.flightglobal.com/pdfarchi...0-%203453.html states that "Figures are being quoted on the Rolls-Royce stand for the Merlin R.M. 2M rated on 100 octane fuel....Merlin II, III and IV gave 1,015 h.p for take off on the same (100 octane) fuel". This was before the modifications made allowing the boost to be raised to +12.

2. (NB:This paragraph refers to June 1937) "The power output of the standard engine," writes Harold Nockolds, "was 1,030 b.h.p. at 3,000 r.p.m. at 10,250ft with plus 6 1/4 lb boost. (The following was left out) Solely by opening the throttle, raising the supercharger pressure, and using fuel of higher octane," he goes on [the petrol normally used at the time was 87 octane] "the engine was made to develop no less than 2,160 b.h.p at 3,200 r.p.m with the supercharger giving 27 lb/sq in boost (albeit this was over a short period of about four minutes - my added comment)....But Elliot and Hives were perhaps even more satisfied with a 15-hr endurance run at 1,800 b.h.p., 3,200 r.p.m. and 22 lb boost..."