Prop ID 100HP Clerget Sopwith - Page 2

rdboobier · 08-15-2019, 01:23 PM

Pmdec - thanks for reply, the info you requested is :-

Dia 2676mm
Hub hole through prop 70mm
Hub flange recess 190mm

I have attempted to measure the pitch having googled it so I hope I've got it about right !

75% distance from hub centre - laid flat on the floor.
True Horizontal distance @ 90deg i.e shadow projected onto floor of blade 242mm
Trailing edge on floor - Leading edge approx 80 mm from floor (all a little difficult to be totally accurate on a carpeted floor !)

Hope this makes sence !

Regards,

Richard.

pmdec · 08-16-2019, 07:12 PM

Hi Richard,

Thank you for your answer. Your measures give a 2.08 meters for the pitch (0.75 x 2.676 x pi x 80 / 242). The Chauvière data for a 2465 serial are 2.75 meters prop diameter (not far from yours) and a 1.75 meter pitch, which is very different. So, if Vickers used a system like Chauvière, the formula is different at least for the pitch.

Sorry to have not anything useful concerning your prop...

There is a simpler method to measure the pitch: have the prop on a table with flat side of the blades up. Choose a distance from the center about 2/3 of the blade length. Put a graduated regular on the blade. Measure the distance between the regular and the table each side of the blade. The difference between those two measures divided by the true length between the two points of the regular is the sinus of the angle. Any calculator will give the tangent of the same angle (tan(arcsin)), without estimating the projection of the blade width.

Regards,
PM

rdboobier · 08-17-2019, 09:06 AM

Thanks for the reply - looks like I've got a non standard one.

I've remeasured it on the dining room table as its much firmer than the carpet !
I get similar dims but the 80 is now 85mm, not that it seems to make much difference.

Using the alternative 2/3rd method the blade width (actual) was 270mm with a rise of 98mm giving a Sine of 0.3629 -21Deg 16'
Tan of .3899 and 251mm horizontal (I think this is what you referred to ?)

However the pitch still does not (according to my calcs) fit with the French one you referred.

I've attached a couple of photos of the blade being checked on the table which show that the trailing edge is quite flat the the hub line.

Probably will remain a mystery.

Thanks again

Richard.

rdboobier · 08-20-2019, 08:46 AM

Having spent many hours viewing both this and other sites I think the VC890 probably relates to Vickers Crayford manufacture and its diameter of 8'9".

Seems limited info on the web for Clerget 100hp engines, but I did find references to type 9J 10.7 litre 9 cyclinder built by Gwynne 100hp - however no references to planes it was fitted - especially Sopwith ones.

wexpier · 05-12-2020, 05:05 AM

Quote:

Originally Posted by rdboobier

I have about 2/3rds of a wooden prop in virtually as new condition.
It has a decal - pale blue oval with red Vickers Ltd Crayford on the blade.
It would have been about 8'9" diameter.
It has 8 mounting holes and a recess in the hub to take the boss.

It is marked 100Hp Clerget Sopwith DRG 2465V on one side of the hub and VC890 Series 54 on the other.
It is Mahogany in 8 layers with wooden dowels within the construction.

It has inspection marking boxes ? with AID 61P 2no on front and 1no on the rear as well as PF in an oval marking.

I was given it many years ago by an old lady from next door who has since passed. She found it when she moved to the house probably 40 years ago in the basement and wanted rid.
I would really like to know what it was mounted on !

I will try and add picures later - had a bit of a problem registering !

Hello, I am a newcomer, I believe I have the same full size prop as you with slightly different markings AID70, I cannot make out the markings on the other side.

I have attached 3 images to show you the markings, did you ever find out what plane this came from or what year these props are from?

Would it be possible for you to explain what the markings mean?

My ultimate question is are these original props and could you put a value on something like this as please?

Kind Regards,

W

rdboobier · 05-16-2020, 12:02 PM

Sorry I can't help very much, I think all the info I have is on this thread.

The guys with the knowledge didn't have much luck with the drawing number as you will have read.

The AID numbers I believe to be the stamp of the inspector who checked it and certified it.

My best guess from what I've read is later part of the war ? the problem is 100HP Clerget's don't get much press - 130 for Camels etc.
Maybe a 'PuP' but a guess again.

No idea of value either but I won't sell mine as it was given to me by an old lady many years ago.

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08-15-2019, 01:23 PM	#11
rdboobier Join Date: Aug 2019 Posts: 7	Pmdec - thanks for reply, the info you requested is :- Dia 2676mm Hub hole through prop 70mm Hub flange recess 190mm I have attempted to measure the pitch having googled it so I hope I've got it about right ! 75% distance from hub centre - laid flat on the floor. True Horizontal distance @ 90deg i.e shadow projected onto floor of blade 242mm Trailing edge on floor - Leading edge approx 80 mm from floor (all a little difficult to be totally accurate on a carpeted floor !) Hope this makes sence ! Regards, Richard.

08-16-2019, 07:12 PM	#12
pmdec Forum Contributor Join Date: Nov 2006 Location: France Posts: 592	Hi Richard, Thank you for your answer. Your measures give a 2.08 meters for the pitch (0.75 x 2.676 x pi x 80 / 242). The Chauvière data for a 2465 serial are 2.75 meters prop diameter (not far from yours) and a 1.75 meter pitch, which is very different. So, if Vickers used a system like Chauvière, the formula is different at least for the pitch. Sorry to have not anything useful concerning your prop... There is a simpler method to measure the pitch: have the prop on a table with flat side of the blades up. Choose a distance from the center about 2/3 of the blade length. Put a graduated regular on the blade. Measure the distance between the regular and the table each side of the blade. The difference between those two measures divided by the true length between the two points of the regular is the sinus of the angle. Any calculator will give the tangent of the same angle (tan(arcsin)), without estimating the projection of the blade width. Regards, PM

08-20-2019, 08:46 AM	#14
rdboobier Join Date: Aug 2019 Posts: 7	Having spent many hours viewing both this and other sites I think the VC890 probably relates to Vickers Crayford manufacture and its diameter of 8'9". Seems limited info on the web for Clerget 100hp engines, but I did find references to type 9J 10.7 litre 9 cyclinder built by Gwynne 100hp - however no references to planes it was fitted - especially Sopwith ones.

05-16-2020, 12:02 PM	#16
rdboobier Join Date: Aug 2019 Posts: 7	Sorry I can't help very much, I think all the info I have is on this thread. The guys with the knowledge didn't have much luck with the drawing number as you will have read. The AID numbers I believe to be the stamp of the inspector who checked it and certified it. My best guess from what I've read is later part of the war ? the problem is 100HP Clerget's don't get much press - 130 for Camels etc. Maybe a 'PuP' but a guess again. No idea of value either but I won't sell mine as it was given to me by an old lady many years ago.