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

[Crumpp]

The date of the Pilots Notes is not a definitive statement as was proved by Kurfursts version of the Mk II pilots notes which had an incorrect date.

I thought Kurfurst proved someone photo-shopped that version.

PS How are you getting on re the proving of 16 squadrons?

I have not seen anything that proves there were any more by September. What I have seen is misuse of information such as a single Inspection and Test certificate to build a case the entire RAF was using 100 octane or failure to explain an illogical use to reserve ratio.

Do you know what a Cylinder head spigot is?

In order to use +12lbs on the Merlin engine, you had to replace the heads with a new design with a increased spigot depth of .020. There were two authorized heads being manufactured to convert engines. One could use the existing rings while the other required a specific set of rings to be installed. Once that was done, the fuel metering system had to be modified. You can figure they would have had a 4 to 1 stock of heads before they started modifying aircraft. They would maintain that ratio even if it limited the size of the force they could convert.

In that memo dated 20 March 1940, it states this will be done as service maintenance. That means it was done on the equivalent of an annual inspection. So depending on when the aircraft made its service maintenance inspection is when it would be modified. Of course, Air Forces generally do it on an hourly basis such as 100 hrs, 200 hrs, 500 hrs up to 2000hrs. The Focke Wulf FW-190 was a 10/200hrs schedule for example. That is a 200 hour inspection can be done 10 times before the aircraft is sent depot level maintenance for overhaul.