1. #1
    The Readme has some information, but vague to me. Yak-7B, '42 ? P-47D, '44 ? Are there any historical designations for these planes ? This is for purposes of reading up on these birds.

    Is the P-47D 1944 a specific block number ? Or is this a jury rigged P-47D that was given 150 octane and boost by some hotshot ground crew in the 8th Air Force ?
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  2. #2
    Zyzbot's Avatar Senior Member
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    Jun 2002
    More than just one or two.


    "A US Air Corps. memorandum from the Chief, Petroleum Section to the Director of Supply dated 13 June 1944, Subject: Grade 150 Aviation Fuel states:
    1. Deliveries of Grade 100/150 aviation fuel to AAF Stations 375, 377 and 373 were started on 10th June. Deliveries started to AAF Stations 378, 356, 357 and 374 on 11th June. Deliveries to balance of Fighter Stations of the Eighth Fighter Command will start on 12th June.
    2. This fuel is being put into station storage as the tanks are emptied of Grade 100/130 aviation fuel. All Grade 100/130 aviation fuel in storage will be used before the Grade 100/150 aviation fuel is started.
    A US Air Corps. memorandum from the Chief, Petroleum Section to the Chief, Supply Divison, US Army dated 11 July, 1944, Subject: Grade 150 Aviation Fuel, stipulated the following:
    The following limiting War Emergency Rating Manifold Pressures have been established by the Eighth Air Force for the different aircraft:
    Aircraft Old W.E.R. New W.E.R.
    P-38J 60" 66"
    P-47D without water 52" 62"
    P-47D with water 57" 67"
    P-51B 67" 72"
    It is thought that the above manifold pressures may even be increased to some extent using 150 Grade fuel, and roughly speaking the increase in speed of fighter aircraft at altitudes below 20,000 ft. is approximately 25 miles per hour. The increase in the rate of climb is approximately 800 ft. per minute. In addition, manifold pressures can be used at the higher ratings without danger of incipient detonation; this gives a greater factor of safety.
    The Ministry of Aircraft Production directed Rolls Royce Ltd. in Requisition MER/388/43 dated 24th August 1944 as follows:
    I am directed to inform you that Headquarters, Air Defense of Great Britain require all Packard Merlin V.1650-7 engines to be modified to operate at 25 lbs.boost in accordance with Rolls Royce Rectification Schedule F.2 Issue 3.
    I am to ask therfore that you will take immediate steps as a matter of great urgency to have the under-mentioned engines modified by working parties under the terms of the above Contract. "
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