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Willy:
"it is not until the winter of 1917/18 that Fokker Dr reached the front in numbers. *The lubrication oil used on the Fokker Dr I was by this time a highly suspect substance known as castor-ersatz, an oil that certainly contributed to the unreliability record the Obersursel UR II."
* * * * * * * * * * * * * * * *Imries: German Fighter
* * * * * * * * * * * * * * * * * * * * *1917-1918 * * *
* * * * * * * * * * * * * * * * * * * * *Pg 41
I'm sure other will have additional information.
Best regards,
Joe
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"Tis a mans game, if ever there was a mans game in this world; and its boys with the soft fleece of adolescence on their cheeks that play it best. "
The Annals of 100 Sqd
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