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Old 09-04-2018, 02:20 PM   #1
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Thumbs down Early British Integral propeller - help please

For many years I have owned what I believe to be an early Chauviere design propeller (sporting two Integral Propeller Co Ltd, British Make decals) which is usually mounted along the stairway in my home. However, because of the mounting, I have been unable to read the serial number on the hub until today, when it was removed from the wall due to an impending film shoot at the house. I'm very keen that I might learn something about it's likely history and would be grateful if anyone can help.

I've uploaded some photos, and taken the opportunity to take some exact measurements. Itís a big one at exactly 3 metres (approx 9ft 10 inches). In fact, all measurements are neatly metric, and rather messy in feet and inches (which could be something of a clue?).

Manufacturer: The Integral Propeller Company Limited (British make)
Length from tip to tip: 3 meters
Number stamped above the centre bore (very faded): 713 (I think)
Number stamped below the centre bore: 3
Centre bore diameter: 8cm
Number of bolt holes: 8
Hub diameter: 21cm
Bolt hole diameter: 15cm
Bolt diameter: 1cm
Hub thickness: 16cm (with metal plate)

I hope this information might give to a few clues about which kind of aircraft it might have been used for, but if there's anything else needed, please ask.

Many thanks,

Paul
Attached Images
File Type: jpg Propeller small.jpg (77.4 KB, 11 views)
File Type: jpg Integral decal small.jpg (91.9 KB, 12 views)
File Type: jpg Upper serial stamp small.jpg (91.0 KB, 10 views)
File Type: jpg Lower serial stamp small.jpg (83.0 KB, 8 views)
File Type: jpg Propeller in situ 2.jpg (88.3 KB, 9 views)

Last edited by Hatcracker; 09-04-2018 at 02:55 PM.
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Old 09-04-2018, 04:27 PM   #2
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Paul,

Your prop looks splendid on the wall of your stairs; about the best positioning of a prop in someone's home that I have seen.

I'll research 3m Integral props.

There will be some lines of data stamped on to the boss which will give diameter, pitch, engine etc. We need this to identify the prop.

With kind regards,

Bob
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Old 09-04-2018, 04:38 PM   #3
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Also, this is a little less common left hand thread, at least implying a pusher application.

Sadly, most of the original varnish has been removed, as evidenced by the dark halo around the decal. That occurs from someone preserving the decal while still refinishing the rest of the surface, which is now lighter in color.
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Old 09-04-2018, 06:30 PM   #4
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Bob and Dave,

Thank you so much for your speedy response. I have never noticed any markings on the boss of the propeller, but with the aid of a powerful torch, I can just about make out some characters.

I think Dave might be right about the 'restoration'. My wife acquired the propeller as a present for a significant birthday of mine, and I suspect the 'dealer' did their best to make the item look as 'saleable' as possible - even to the extent of practically eliminating the serial numbers on the boss.

This is what it appears to be - but please allow some interpretive leeway.

C.
00
50
A.D.
03

CHL (These last three characters are almost indecipherable. It's possible there may even be more or less than three characters)

Sadly a photo with a camera phone under artificial light shows absolutely nothing, so I cannot currently upload a pic (Perhaps a studio light and an SLR might prove better)

Many thanks for your continued help

Paul
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Old 09-04-2018, 09:17 PM   #5
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This speckled appearance to the paint on the hub is distinctly "unusual". I can't recall ever seeing it on any other hubs or blades. I wonder if it was an attempt to embellish it. The way the paint follows the nicks and dents suggests that it was applied late in the prop's existence.






Still, it's an elegantly shaped propeller and is undoubtedly "old".











.
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File Type: jpg Upper serial stamp small.jpg (91.0 KB, 23 views)
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Old 09-05-2018, 02:36 AM   #6
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The paint looks far less speckled in real life - much more of a dull 'battleship' grey. The effect is pronounced because there is reflected light from some gold curtains out of shot at the top of the hub, plus I have played with the brightness/contrast settings of the photograph in order to give you the best chance of spotting the serial numbers when online in low res.

Having said that, I think you're right - it's almost inconceivable that its the original paint!
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File Type: jpg Hub.jpg (83.2 KB, 4 views)
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Old 09-05-2018, 01:11 PM   #7
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Paul,

I don't have a 3000mm prop made by the Integral Prop Company listed but I do have 2900mm and 3150mm listed.

The drg nos IPC 2303, 06, 65, 67, 68, and 69 all have diameters of 2900mm, and were for 80hp Renault and Gnome engines, fitted to Maurice Farman aircraft.

IPC 2610 was a four-bladed prop of 3150mm diameter but is one of those props made of two separate two-bladed props, which implies that it was shipped to some overseas location: two such two-bladed props laid side by side occupied much less shipping space than one four-bladed prop. Your prop might be one of these two-bladed jobs!

With kind regards,

Bob
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Last edited by Bob Gardner; 09-05-2018 at 01:23 PM.
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Old 09-05-2018, 01:19 PM   #8
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Paul, a post-script!.

The IPC 2610 prop was used on the 275hp Rolls-Royce engine in the DH4 aircraft.

Bob
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Old 09-05-2018, 01:32 PM   #9
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Paul,

Have you just bought a book from me? Part 3 of my series on British prop makers of WW1 describes makers from Farringdon to Lang but includes fifty-one pages devoted to the British Integral Company.

With kind regards,

Bob
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Old 09-05-2018, 02:52 PM   #10
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Thanks for your speedy research Bob.

I have indeed just bought the relevant volume of your book(s) and look forward to a much greater understanding of the Integral Propeller Company.

The measurement of my propeller is exactly 2,998mm from furthest tip to furthest tip through the middle of the centre bore. (Given the metric neatness of all other measurements, I'm guessing the 2mm is shrinkage or the dreaded 'restoration')

Is it possible that some Integral propellers were built and stamped without being recorded - or if the records are not entirely complete? Do the indistinct characters on the boss, or the hub/bolt diameters give any greater clue?

A nagging doubt has now surfaced in my mind. Perhaps the Integral decals may not be legit (although as Dave points out, it looks like they were on the propeller before any 'restoration' took place.

In any event, thank you for your detective work. It really is most interesting.

Kind regards,

Paul
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