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Old 02-14-2019, 06:51 AM   #1
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Default Axial 120PS D270 "EDUL ZUG" propeller

Hi, has anyone seen a prop like this before? Diameter is 11 feet (335 cm), hub is just over 5" thick (13 cm). A couple numbers embossed on the front (serial and horsepower?) but nothing else. Curiously it has only six bolts. Found in the south-west of the Netherlands.






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Old 02-14-2019, 09:10 AM   #2
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It's not common but certainly not unusual. It's hard to identify, particularly since the 6 bolt hole hub eliminates many of the early (WW1 era) engines. Even at 11 feet it's still a little smaller than most of the airship propellers.
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Old 02-14-2019, 05:01 PM   #3
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The data block was located.

142...
Axial
Berlin
120PS D27....
TP11
EDUL ZUG (there is that magical word again where nobody knows what it is)

It was probably not measured correctly.

Very weird though, to see an Axial propeller with just six holes?


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Old 02-15-2019, 08:08 AM   #4
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My current guess is that it belonged to an Albatros B.II with Argus As II engine.
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Old 02-15-2019, 09:19 AM   #5
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"Edulzug" just means tractor propeller (vs. pusher). I presume that you've already figured out that the "PS" refers to horsepower (although stamped HP often doesn't match with currently listed engine HP for many engines.)

It's unfortunate that we've more or less lost Bob Gardner's input here. He understandably got tired of doing a lot of free research with not even a word of acknowledgment for his efforts from the poster asking the question. I share in his frustration, and we've discussed making this research a paid service instead of a voluntary effort.

Bob's books on German propellers have a lot of useful information in them, and I'll see if I can find any clues there.
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Old 02-15-2019, 04:17 PM   #6
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Thanks very much!
I too have spent thousands of hours researching aviation stuff for others, I know what you mean.
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Old 03-02-2019, 07:58 AM   #7
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EDULZUG, also EDUL ZUG, are the initials of Entgegen Dem Uhrzeiger Lauf which translates as Against-the-direction-in-which-the-clock-hand runs when regarded by the pilot in his cockpit. This is anti-clockwise in English.

The data appears to read;
AXIAL The maker
BERLIN
120PS This indicates the Mercedes engine designed early in WW1, of 120hp, or the Argus 120ps engine. (The early Benz engine also produced 120hp, but I have no record of Axial making a prop for this engine.)
D275 Diameter in cm. This is the typical diameter used with the Merc 120ps engine. I have recorded several examples. 270cm equates to ten feet six inches.
St158 The pitch in cm
TP 11 Axial's Type number
11204 or 14204? The serial number. This suggests it was made around 1916.

I have recorded a 120ps prop made by Axial for the Pfalz E.V, dimensions unknown. I have also recorded a prop of these dimensions made for the Argus 120ps engine, aircraft type not known.

If anyone can read any of the data better than I have, please let us know.

With kind regards,
Bob

80 minutes of research.
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Old 03-02-2019, 08:43 AM   #8
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Postscript: six bolt holes were common on early aircraft and are found marked for 100ps and 120ps engines.

Bob

1 minute research !
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Old 03-02-2019, 10:05 AM   #9
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Quote:
Originally Posted by Bob Gardner View Post
With kind regards,
Bob

80 minutes of research.
Awesome, as usual!
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Old 03-19-2019, 08:11 AM   #10
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Hello Bob,

Thank you very much for your digging work and my apologies for getting back to you so slow. I went on holiday in early February and afterwards other things needed my attention.

That's wonderful information! Finally an explanation where that mystical EDULZUG word comes from. Is there a similar term for clockwise props?

I have looked high and low for the source of this propeller. I am suspecting an Albatros B.II, but that's more a gut feeling than anything concrete. No Dutch internment seems to be a direct match with the prop and location, but the Albatros comes close.

Thanks again for your help and time!

Ronnie
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