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Old 05-10-2015, 06:41 AM   #7
Bob Gardner
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Location: The North of England
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Marian,

From Autumn 1917 propeller production was centralised under the Air Board, which later was renamed as the Air Ministry. From this time all propellers were made in batches of 100, indicated by the letter G and each of the 100 props was numbered with a prefix of N. Hence G571 N64 is the sixty-fourth propeller made in batch 571.

These batch numbers can occasionally be dated from known contracts. But it seems that there was often a three month gap between the contract date and the date of delivery.

Your prop batch number 571 dates (probably) from late 1917 and might have been delivered in the Spring of 1918.

With kind regards,

Bob
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Bob Gardner
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