View Full Version : Generator Propeller Identification

09-28-2012, 11:22 AM
I recently aquired a pair of WWI Auxiliary Generator Props. They measure 18 inches and are a laminated mahogany construction. Markings include the AIS stamp,and the A (Army?) and arrow marks on one of the hub flat surfaces. The barrel of the hub has one 6 digit number, the letters R A F, then 500 watts and another 5 digit number. Can anyone identify the manufacturer and give an approximate date of manufacture? I thought the R A F might refer to the Royal Aircraft Factory as there are no other manufacturers details. Any help would be very much appreciated.

Bob Gardner
09-29-2012, 09:07 AM
Welcome to the forum.

Your prop was designed by the Royal Aircraft Factory and is likely to date from the second half of 1917. It powered a generator which gave up to 500 Watts and was typically used on large bomber aircraft such as the Vickers Vimy and the Handley Page O/400.

AIS is actually AID which is the stamp of the Aeronautical Inspection Department and its presence is proof of airworthiness.

The number T28142 is the drawing number where the letter T indicates the Royal Aircraft Factory who designed it. A known maker of these aux props was WD Oddy of Leeds.

With kind regards,


09-29-2012, 12:59 PM
Hi Bob
Thank you for the information, I bought the props recently at a general auction and got them for very little. I'm pleased with the aquistion now to find somewhere to display.

Many Regards

Stan Jobson (Propadom)