Mystery Propeller

[Fris B. Fairing]

A friend in Denmark has asked for assistance in identifying this propeller. The markings on the hub suggest that it was made for a D.H.4. Can anyone confirm please?

[134brat]

The DH4 was fitted with many engines among which were the BHP 200 and 230 hp versions.

The aircraft used what appeared to be a four bladed prop but was actually two two blade units so it looks like your friend has 'half' of a DH4 prop. Nice to see it survive in good nick.

[dduxbury310]

The "data" embossed on hub would be (1st line), (Air Board?) Serial number; (2nd line) Aircraft Type; (3rd line), Appropriate engine (200 [HP] BHP); (4th line), Diameter (in metric, millimeters); (5th line), Pitch (in metric, millimetres). Believe that metric system was introduced by the RFC (or Royal Aircraft Factory?) at a very early date, possibly because so many of the very early aircraft (and aero engines) used by British services were either of French manufacture, or license-built from French manufacturers. So far as I know, the expression of technical data on British propellers lasted well into WW2. Anybody care to comment on my hypothesis, such as it is? Thank you in anticipation. Note that the "BHP" as listed on first line stood for "Beardmore-Halford-Pullinger" (designers and manufacturers) and NOT for "Brake Horse Power"!

[megan]

Note that the "BHP" as listed on first line stood for "Beardmore-Halford-Pullinger" (designers and manufacturers) and NOT for "Brake Horse Power"

I read it as "200 brake horse power Siddeley", What might be an alternative reference of the "SID"? Sidderely referring to the Puma engine I'm guessing, which in itself was based on a previous Beardmore Halford Pullinger (B.H.P) engine, never the less the B.H.P. engine did power the DH-4 as well. Have me wondering dduxbury, some one with WWI knowledge could put this to rest in short time I'm sure.

[Fris B. Fairing]

The owner of the prop is most grateful for your contributions, as am I.
Thank you everyone.