AIRCRAFT GENERATOR PROPELLER

[kronos]

HI
can anybody give any info on a aircraft generator propeller manufacturer called G BETJEMANN & SONS . The propeller i have is stamped with the military arrow and the letter A above along with other design stamps etc. I will dig out the camera and post photos asap. I not sure of its age. Any info is welcome.

[Bob Gardner]

Hello Kronos,

What a splendid piece of news, at least for me. Betjemann is one of the makers described in my book on WW1 props but I have never seen a prop made by them. I would very much appreciate a few photographs at a high resolution that I can put in my book, if you are willing for me to do so. Please send them to my e-mail address which is spread throughout my website at www.aeroclocks.com. I don't want to put it here because I get enough spam already!

The description of this maker in my book is;

Betjemann, George & Sons Ltd
36 Pentonville Road, London.
Cabinet-makers since 1825, the family was related to the poet Sir John Betjeman. As well as fine furniture, they invented the Tantalus, and made a wide range of Objets d’Art.

With regards,

Bob

[Bob Gardner]

Hello Kronos,

Any photographs yet? If you have difficulty putting them on this forum, send them to me by clicking on the e-mail box, bottom left below, and I'll put them on.

With kind regards,

Bob

[kronos]

HI BOB
THE PHOTOS HAVE BEEN SENT TO YOURE EMAIL AT AEROCLOCKS.IF WANT TO USE THEM FEEL FREE TO DO SO AND THANKS FOR THE MAKERS HISTORY INFO.

REGARDS KRONOS

[Bob Gardner]

Many thanks Andrew. I'll post them on the forum.

Bob

[Bob Gardner]

Here are Andrew's photographs.

These are of a British auxiliary aircraft propeller used to generate electrical power up to 500 Watts in a WW1 aircraft such as a Vickers Vimy. The prop is about 18 inches long and was made by Betjemann & Sons.

The hub is stamped T28153 where the letter T indicates that it was designed by the Royal Aircraft Factory before April 1918. The numbers are the drg no for a prop designed to produce 500 watts whilst the aircraft was flying between 90 and 115 mph.

The hub is stamped AID (with an illegible number) to indicate that it was passed as airworthy by the Aeronautical Inspection Department.









With regards,

Bob

[kronos]

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[kronos]

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[kronos]

[Bob Gardner]

Thanks Kronos, for the better photographs.

[abufletcher]

Wow! Great photos! What is the diameter of this prop? Also were generator props always right-handed props (rotating clockwise when viewed from the front)?

[Bob Gardner]

This prop is eighteen inches in diameter. I don't know if they were all RH rotation; as they were designed by humans, I doubt it ! Would the direction of rotation matter for a generator prop? If it generated a sine wave, would the result not be the same either way?

Bob

[kronos]

JUST GOT THE TAPE OUT AND THE PROP IS 485MM IN DIAMETER

[Bob Gardner]

Thanks kronos !

Bob

[kronos]

HI BOB
IF ITS ANY USE, WHILE CHECKING THE BACK OF THE HUB THERE IS A SECOND "AID" STAMP WHICH WHEN YOU USE A TORCH TO CAST A SHADOW ONTO IT REVEALS IT TO BE H43

REGARDS ANDREW