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

[Crumpp]

We know the changes to the aircraft to enable it to be used with 100 octane and the changes are minimal.

NO, changing cylinder heads is major repair.

[Glider]

Originally Posted by Crumpp

NO, changing cylinder heads is major repair.

Rubbish The major work is already covered in the new production engines or in routine maintanence. What is left is minor and easily done. How many front line aircraft wouldn't have been maintained in the three months from March to June?

You say you have experience in this field but I must say I seriously doubt this. I strongly urge you to show some of the engineers you have worked with the paper outlinging the changes and ask them how long it would take to drill two holes and reassemble the piece as described.
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Glider,

I am not argue with you anymore. The facts are plain.
.

On that I totally agree with you

i.e. I agree
You have done nothng to prove your theory of 16 squadrons, or the bases that would have held the fuel. You have no evidence of any fighter combat using 87 octane apart from some I gave you iro OCU units who woldn't have had 100 octane. There is no evidence from any participant or historian to support your theory. You have no evidence to support your theory from the oil committee who would have been involved in the disribution of said 100 octane fuel, unless you believe that we fought the entire war with 16 squadrons on 100 octane in the UK. I say this as after May 1940 there is nothing more in the papers about increasing or extending the roll out of 100 octane at any time.

There is no suggestion from any report or status paper from any source, be it Cabinet Meetings, Oil Committee or Air Ministry to support the idea that there was a shortage of 100 Octane fuel, again apart from my finding that there was a shortage in May 1944.

[Skoshi Tiger]

Originally Posted by Crumpp

NO, changing cylinder heads is major repair.

Changing the Cylnder head in this case is not classed as a 'repair'. It was completed as part of the Merlin engines service maintenance.

To me this implys that the cylnder head modification would have already been performed on aircaft scheduled for that service before the change over. This would have sped up the conversion process conciderably.




Luckly the RAF had very competent and well trained mechanics and maintenance personel to perform the task.
Cheers!

[Crumpp]

Major repair means a repair:

(1) That, if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or

(2) That is not done according to accepted practices or cannot be done by elementary operations.

http://ecfr.gpoaccess.gov/cgi/t/text....0.1.1&idno=14

By Convention, improperly installing a cylinder head or misadjusted valves will effect powerplant operation and is a major repair by itself.

Glider,

I am not argue with you anymore. The facts are plain.

you will not see technical orders that are applicable to operational units that do not make it into the new edition.

[NZtyphoon]

Crumppquote: you will not see technical orders that are applicable to operational units that do not make it into the new edition.

Wrong - as long as the engine was originally designed and rated for 87 Octane fuel the Pilot's Notes did not incorporate anything else until 1943. Any amendments to the engine's ratings continued to be issued as supplementary slips.

The Pilot's Notes General 2nd ed printed in April 1943 dropped the convention because most engines which were originally designed to use 87 octane fuel were well out of frontline service.