Help to identify propeller

[nl77621]

Hi everyone, I have a 4 blade propeller that has the following identification numbers on it

DRG CD 40597A
SER NO 4668

It also has a small round logo with circle and inside circle A73

Can anyone give me more information on this propeller?

Thanks for your help!

[Dave]

It's certainly an unusually high drawing number, especially if it's WW1 era. I certainly don't recognize it offhand. Do you have a full picture of the prop?

[nl77621]

Hi Dave, thanks very much for your help! I've posted some more pictures let me know what you think.

Thanks again

[Dave]

How long is it from tip to tip? I think that's an auxiliary prop of some kind, usually for generating electric power. The 4 hole hub virtually eliminates its use on standard aircraft engines.

Bob Gardner may be able to refine it futher. He drops in here from time to time.

[wallpaperman]

wallpaperman

hello,
I am from Finland and bought this Astra propeller from Estonia at 1992.

8095
PS 185 B
D 305
S 172

Lenght is 305 cm
Blade wide is 29 cm
hub is 23 cm
hub hole is 8,7 cm
4 boltholes

Matti Parkkila, Wallpaperman

[Bob Gardner]

Hello Finland!

Astra props are comparatively rare. The serial number of yours, 8095, is the latest I have recorded which suggests your prop was made in the latter half of 1918. Two Astra props are recorded for the NAG 185ps engine powered DFW CV, although they had a diameter of 2950mm and a pitch of 1850mm compared with yours of 3050mm and 1720mm respectively, so you should regard this attribution as possible rather than probable.

With kind regards,

Bob