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Old 04-22-2019, 08:48 AM   #11
Dbahnson
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Now that I compare the Salmson propeller to the Caudron propeller I realize that ahranis' prop looks like a right hand thread, but photos of the Salmson show a left hand rotating prop with the Canton Une engine.

What am I missing here?
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Old 04-22-2019, 11:35 AM   #12
pmdec
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Quote:
Originally Posted by Dbahnson View Post
Now that I compare the Salmson propeller to the Caudron propeller I realize that ahranis' prop looks like a right hand thread, but photos of the Salmson show a left hand rotating prop with the Canton Une engine.

What am I missing here?
Hi Dave, you are not missing anything, you are asking a very interesting question! I have still not found anything more specific about ahranis' prop... which have other strange details: the hub (pic DSC09733) and the assymetric aspect of blade feet on the intrados (...) side (pic DSC09732).

Quote:
Originally Posted by Dbahnson View Post
It doesn't look "restored" to me, even though as PM says it may have been "modified" at some point, so it's a very nice collectible item as is.

I still have a similar prop used on the Salmson A2A. Now I'm wondering if mine was actually manufactured by Regy, although it's not apparent from markings on it. It does have a Regy "look" to it though, similar to yours.
The "modification" shown by the stamps and the letters near them are from the WW1 era or just past it. IMHO, the only "restoration" I can see is a coat of transparent varnish added "recently", at least after the prop was not airworthy anymore.

And yes, Dave, your Serial 804 is a Régy design prop. You can find it in the Gorrell's papers, and from French archives this propeller was the best to fit on Salmson 2A2 with the CU Z9 engine. And it is left handed...

@ahranis: could I have a close up of the two (normally, 3) square stamps on the flat side of the hub? Perhaps there are also two numbers near them.

Regards,
PM
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Old 04-22-2019, 12:09 PM   #13
ahranis
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there are actually three stamps.
Two on the one side and one on the other of the hub if I remember correctly.
As soon as I go home I will reply with the photos.
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Old 04-22-2019, 12:10 PM   #14
ahranis
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I suspect that the " restoration" must be my fathers act.
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Old 04-22-2019, 03:14 PM   #15
ahranis
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part1
Attached Images
File Type: jpg DSC09758.jpg (93.2 KB, 7 views)
File Type: jpg DSC09760.jpg (93.9 KB, 5 views)
File Type: jpg DSC09762.jpg (96.0 KB, 6 views)
File Type: jpg DSC09763.jpg (97.0 KB, 5 views)
File Type: jpg DSC09765.jpg (96.9 KB, 4 views)
File Type: jpg DSC09767.jpg (98.1 KB, 3 views)
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Old 04-22-2019, 03:18 PM   #16
ahranis
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the third stamp is also visible in dsc09725 and dsc09727.
Is that an R. and a B or 8?

There is no other rectangular stamp on the flat parts of the hub
Attached Images
File Type: jpg DSC09770.jpg (97.8 KB, 3 views)
File Type: jpg DSC09773.jpg (96.8 KB, 2 views)

Last edited by ahranis; 04-22-2019 at 03:33 PM.
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Old 04-22-2019, 04:11 PM   #17
pmdec
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Hi ahranis,

I can't read the sign beside the SFA stamps which is on the right of M1...

The three others (2 on the flat side and 1 under Cu 260) could have the same sign, which is the greek letter beta. It has nothing to do with your country or the place the prop was found. It is there because the workshop where the prop was repaired or modified was the Chauvière workshop and one of the militaries who controlled the prop in the late WW1 used this beta sign to show who has the prop controlled. I join a pic of a Ratier serial 15 which was repaired and controlled in what I guess was the same workshop.

I am still looking at pictures of Salmson aircraft of the 1917-1920 era but all where it is possible to know which way the prop was rotating show left handed prop... The only right handed are on Salmsom-Moineau where there was one right handed and one left handed on the same aircraft, but they used Salmson 230HP engine...

Just an idea: are you sure your pics #9730 and 9746b are not flipped?

Regards,
PM

EDIT: Removed one question about font.
Attached Images
File Type: jpg c1_SFABêta_Nf_IMGP6185_cr_800px_97K.jpg (95.8 KB, 7 views)

Last edited by pmdec; 04-22-2019 at 05:44 PM.
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Old 04-22-2019, 08:20 PM   #18
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Hi,

I am trying to have some answers to which Salmson aircraft could use a 260 HP Canton-Unné with a right handed prop.
I have posted a question on a French forum where there are very knowledgeable people about aircraft :
https://forum.pages14-18.com/viewtop...521329#p521329

To go forward on this thread, I have to wait for possible answers... excepted if the 9730 pic was flipped!

Regards,
PM
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Old 04-22-2019, 08:30 PM   #19
Dbahnson
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Pierre-Michel, with digital files it takes some effort to "flip" photos, but it can be done. (It's not like the old photo negatives that could be inserted backwards.)

I did use some "mirror image" software to digitally flip the original prop photo, but I doubt that it would happen accidentally, and if it did I would expect to see the letters on the other photos also appear as mirror images. If that is done, however, it creates a digital appearance of a left hand thread.

I'll wait for ahranis to confirm or deny if the photo has been "flipped".
Attached Images
File Type: jpg DSC09730.jpg (81.5 KB, 3 views)
File Type: jpg mirror image.jpg (81.0 KB, 4 views)
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Old 04-23-2019, 01:10 AM   #20
ahranis
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The pics are not flipped (mirrored)

(My apologies, I thought I sent the message last night. Fell asleep trying to text 😂 )

There was no reason for doing this

The sign is quite unreadable because of the varnish there.
It seems to be that beta symbol again but I
cant be sure .

If thers is a gentle way of removing that varnish I
could proceed

Last edited by ahranis; 04-23-2019 at 01:37 AM.
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