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Old 11-30-2009, 09:28 AM   #1
Tue
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Smile 1918 Flying Boat Prop Denmark

Hi all

I just purchased my first wooden prop dating back to 1918.
Supposebly it was usen on one of the Danish flying boats by the Danish army.

It has no decals but is sad to be manufactured by "Tøjhusværkstedet" of which I can find very little information, but prob. owned by the Danish army.

It has no reinforcements but it looks very similar to the props depicted on the flying boats, and also very similar to the picture of the prop mounten on the engine next to Ellerhammer.

If it is from a Danish flying boat there are only about 20 planes it could have come from, I would love to find out which one, but where to start?

I would very much appreciate any help on this.

First question, what does S 245 stand for?
Also, what should I do about the white paint splatter?



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Old 11-30-2009, 09:37 AM   #2
Dave
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First, I'd just leave the paint splatter alone. It's just part of its history, and "restoring" it by removing the paint may lessen its value.

I think the "S" stands for "pitch" in whatever lanquage was used by the manufacturer. Typically, those numbers would be "diameter" and pitch, so if it is in fact 250 cm in length, which you can measure, then it's likely the pitch is 245 cm, meaning that in a theoretical sense it would move that distance in a single revolutioin, like a screw.

Finally, most of the propellers used on flying boats required metal sheathing to protect them. There are exceptions to that, but I would seriously also entertain that yours might have been used on land based aircraft.

It's a lovely looking prop, by the way.
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Old 11-30-2009, 09:58 AM   #3
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Hi Dave, thanks for your quick replay.

I will leave the paint splatter alone, I thought about gently scraping it off.

The D def. stands for diameter as the prop is 250cm in lenght. If the P stands for pitch is it possible to say how powerful the motor would have been to propel it? Knowing the engine might make it easier to identify the plane.

You mention that it could be a land based aircraft. To explore that, I have attached a list of planes in percession by the Danish fleet. Most of them are flying boats though.

4 Maurice Farman 1913 - 1922
3 Henri Farman 1913 - 1919
1 Caudron 1914 - 1922
1 Bleriot 1915
2 Morane Saulnier 1915 - 1919
2 DK I & II 1916 - 1924
12 F.B. 5 1917 - 1924
6 Type Aa. 1917 - 1919
9 H.1 til H.5 1918 - 1924
2 Södertälje Werkstad 17 1918 - 1924
5 LuftVerkehrsGesellschaft B III 1920 - 1929
4 Brequet XIV. A2 1920 - 1927
5 Avro 504K 1921 - 1931
1 Rumpler BI 1921
1 Fokker D.VII 1922 - 1927
5 Fokker C I 1923 - 1933
8 Potez XV H2 1923 - 1928
2 Fokker S III 1924 - 1927





I will be happy to translate any info on the planes.
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Old 11-30-2009, 10:11 AM   #4
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Found another great resource:

Looking at the props mounted on these planes, it looks mostly similar to the prop found on Glenten 1912-1913, but that is way to soon?

http://www.marineflyverforeningen.dk...r/flytyper.htm
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Old 11-30-2009, 10:28 AM   #5
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I would first go to this page, then follow the link to the hub dimensions chart. That should at least tell you what engine it isn't likely from, but matching the dimensions doesn't necessarily mean that it's from that engine, as not all possible hub sizes are listed.

The fact that the pitch is apparently 245 cm with a diameter of 250 cm means that as pitch goes, it's fairly coarse, i.e. the blade has a high angle of attack. It's similar to having a transmission in a higher gear, where a flat pitch is equivalent to a lower gear.

When I get home I'll look through some known British and French propeller sizes and see if anything looks similar. In the meantime, if you can get the hub dimension match, it would help.
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Old 11-30-2009, 10:41 AM   #6
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I am still waiting for the auction house to deliver my prop.

Going by your chart and the danish planes listed above, I can only find a match to the Gnome 100HK engine.

Which narrows it down to:

- OV's Flyvebåd F.B III, 1916-1924, 10 aircrafts made
Used for recon. built in Denmark

- Avro 504K L.B.I, 1921-1925, 9 aircrafts made
Used for training, built in the UK two of them were later modified in Denmark

Crossing fingers that the HUB matches the Gnome 100HK. I will meassure it as soon as it arrives.
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Old 01-11-2010, 07:56 PM   #7
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Default Danish flying boat

You have asked a question about a propeller that was mounted to a flying boat that my grandfather's brother Lt.Axel Hoeck flew for the Danish navy.I have pictures and a logbook.Sadly he was killed during a flight (1914 I think), when during a turn the wing folded and the aircraft crashed into a pier. It was very exciting to see the additional pictures of the aircraft posted on this site, since I for several years have tried to find more pictures.I have 2, both of Axel Hoeck and his plane.If you have more info. I will be very interested!
Peter Petersen
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Old 01-14-2010, 06:26 PM   #8
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Hi PeterJane

Thanks for sharing...that is one interesting tale.

Unfortunately my suspicion that the prop does not originate from the flying baot Maagen, was confirmed byt the Technical Museum in Denmark.

The Technical Museum in Denmark have a replica of the N.W military aircraft with an original Thulin engine, which I had a strong hunch would fit my propeller. They were kind enough to measure the boreholes and there is a match.

So now I am confident that my propeller is not from a Marine aircraft but belonged to one of the Danish Military aircrafts at the time and most likely Södertälje S. W. 17 which had the same engine as the N.W but was the only aircraft manufactured by Tøjhuseværkstedet T.V.

The Nielsen & Winther Type AA was the only other aircraft from the same period wiith a matching engine, but this aircraft was build by A/S Nielsen & Winther Aeroplanfabrik probably marked A.S.

So I think I have found my aircraft, all I need now is more concrete proof like an invoice or something.

I would still love to share information, and see if I can help you in the right direction. Does your logbook show which Maagen aircraft he flew, there are more than one you see )

Best Regards, Tue

Last edited by Tue; 01-15-2010 at 03:00 AM.
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