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ratisbons
11-09-2016, 07:29 AM
Hello everyone,

We are an auction house selling militaria, coins and antiques and got this wonderful HEINE made propeller consigned for the next auction. Since this is the first time we are handling something like this, we appreciate any information on it. Can anyone tell which aircraft this example would have been use for?

Many thanks for your time!
Klaus


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ratisbons
11-09-2016, 07:30 AM
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ratisbons
11-09-2016, 07:30 AM
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ratisbons
11-09-2016, 07:30 AM
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Bob Gardner
11-09-2016, 11:10 AM
Grüssen Klaus,

You are the first auction house to ask our advice. We will be delighted to answer any query you might have. A few of us have occasionally identified props for Museums in Berlin, London, Paris and the USA.

Personally, I have gathered much information for my databases from auction catalogues via specialist search engines such as Invaluable.

So, you are setting up in competition with Hermann Historica in München! If you only exist on line, you will have a considerable financial advantage over those who have large auction rooms to run.

Your prop was made for the 100ps Mercedes engine. The underlying design dates from c1913 when it was a four cylinder engine producing 70ps. The addition of two more cylinders raised the horse power to 100ps and development quickly raised this to 120ps and 160ps.

The design of your propeller dates from 1913-1914, but the 100ps engine was in use throughout WW1 in training aircraft etc, so a prop like this sometimes appears to be an anomaly. But the serial number of your prop, 2784, is comparatively early and suggests 1915. It would have been fitted to early B.I aircraft made by several makers such as Aviatik, Albatros, AEG, DFW and LFG.

The propeller, although made by Hugo Heine in the Waidmannslust suburb of Berlin, shows a design characteristic of Lucien Chauvière, whose ground-breaking research and experimentation made him the most eminent maker from c1911 to 1915, which is that the prop trailing edge describes a straight line through the centre of the hub. However, experimentation by Herr Professor Doktor Ludwig Prandtl at MVA in Göttingen, produced better and more efficient design without this characteristic.

The data on your prop translates as;

100ps Merc; the engine power and make
D (Durchmesser) diameter 270cm
St (Steigung) pitch 150cm
N2784 the serial number.

Heine's serial numbers from 1913 to 1919, that I have recorded, run from 233 to c36,000.

The witness marks on the hub of your prop show it to be a flown example and it is in excellent original condition (although a casual observer would not think so!) The low estimate price at auction is around €1500. If two collectors both bid for it, this could rise to €4000.

Mit freundliche Grüssen,

Bob

Dbahnson
11-09-2016, 12:18 PM
Beautiful artifact, and thanks to Bob for sharing his wealth of knowledge on the subject.

Good luck with the auction. I regret that I probably won't be bidding on it, although please post auction details when you have them.

ratisbons
11-10-2016, 11:12 AM
Thanks very much for welcoming me and taking the time to provide all this details. Great!! I really appreciate your help and will add these information to the description.

We got this one in for 1300 Euro starting price so I'm glad this is even cheaper than your recommendation!

Here is a direct link to the propeller:
https://www.ratisbons.com/14th-Contemporary-History-Auction/WW1-wooden-propeller-Heine.html

Online bidding will be open from 20th - 27th November 2016.
You will need to sign up an account and verify your account for bidding. Everyone interest just send me a PM and I will sort out the verification.

Many thanks everyone!
Klaus

ratisbons
11-27-2016, 03:05 AM
Bidding ends today! No bid so far. If it does not sell during auction take advantage of our 0% buyer's premium for all unsold items.

Thanks!