CGS Woodenprop ID? (Pictures)

[marker23]

Any information on the below prop, would be appricated. (ect markings, history, aircraft, value). The CGS marking is not listed in the manufacture ID's.

[Dave]

All I can tell you is that the 6 hole hub is a little unusual, so there won't be a lot of engines that used it, and the construction looks more typical of a German manufacturer, many of whom chose contrasting wood species like that.

[Bob Gardner]

I agree with Dave in that it is almost certainly a German prop and probably dates from c1913 but might date from the early post WW1 period, say 1920-1923.

I can't tell you much more about it. The six bolt holes indicate an engine of low power, well below 100hp. The two numbers 60 27 might possibly indicate a 60hp engine and a prop of 2.7 metres length. How long is the prop?

I don't know what CGS indicates.

With kind regards,

Bob

[Dave]

Any chance that the "GS" in CGS refers to "Gesellschaft" (company)? I don't know how that would be abreviated in German.

[marker23]

Here are the measuments.

Question: Why would the bolt holes be countersunk on both sides of the hub?? (See pix)

[marker23]

I was just googling CGS engine and came across the following:

College Park Airport (CGS), College Park, MD

http://www.collegeparkaviationmuseum...n_Aviation.htm

http://members.tripod.com/airfields_...ds_MD_PG_N.htm

Airport was established by the Wright Brothers. There was a lot of aviation going on there. The first of these companies was the Rex Smith Aeroplane Company, established by well-known inventor and patent attorney Rexford Smith. With an aero of his own design, Rex Smith made many noteworthy flights over the Washington area.

Could this be a Rex Smith Aeroplane Company prop? That they used CGS as the airport for the engine ID?

[Dave]

Here are the measuments.

Question: Why would the bolt holes be countersunk on both sides of the hub?? (See pix)

So that's a diameter and hub appearance that's more typical of a modern style propeller that might power a 65 to 100+ horsepower engine like a Continental or Lycoming, etc., and most likely the "60" in the stamped numbers is simply the diameter in inches. Typically the 27 would then be pitch, but if so the propeller should look very "flat" if looking at it from the side.

I'm not sure about the countersunk holes, and they may be an alteration made later to mount it. The dark coloriing around the holes is where the metal hub mounts, so the countersunk area doesn't accomplish much because the metal hub would serve as a sort of washer on both sides of all of the holes.

[Bob Gardner]

We are making progress! The numbers 60 27 indicate the diameter in inches (60) and very probably the 27hp Anzani engine which was in use from 1911-1913. A sixty inch diameter almost rules out a German prop. The diameter would be expressed in mm. It is very likely to be English or American.

I don't know why the bore holes are counter sunk. It implies an absence of a hub plate.

Dave,

Gesellschaft is a single word so I don't think that the Germans would reduce it further. It means society and hence company. The full term of Gesellschaft mit beschränkter Haftung is usually abbreviated to GmbH. It translates literally as Society with restricted Responsibilty; in other words a limited company.

Bob

[Dave]

Measure the diameter of the bolt holes and then the size of the bolt hole circle on which they all sit and I'll compare it to this propeller which I have at home that was used on an Anzani engine.

I won't be home in the immediate future. I'm in Minnesota putting floats on a plane that we then plan to fly down to Florida, which will take the better part of this week to get done.

[Bob Gardner]

Those tiny vertical lines at the twelve o'clock of each bore-hole probably indicate where someone tried to free the bolt. They were torqued-up considerably when the prop was fitted. On some German props which used individual washers to spread the load, the mark of a screw driver driven between the wood and washer can often be seen.

Bob

[marker23]

Watch this video http://www.youtube.com/v/_Bm4Ei_eNO8(. That looks just like my prop. (Except the pitch is backwards)


http://en.wikipedia.org/wiki/Anzani

http://en.wikipedia.org/wiki/Bl%C3%A9riot_XI

[Brett Robb]

http://www.cgsaviation.com/

[marker23]

Brett.

I had looked at that when I was googling. However, their props are composite 3 bladed.

[Brett Robb]

Not all of them, been making them since 1982 many of them have 2 blade wood propellers.