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Old 01-03-2021, 10:57 PM   #11
Garuda
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Default T.6296

Some photos of the T.6296 tip in position on the revised drawing. Note, in the last photo there is a series of dowels. From other Royal Aircraft Factory drawings I know that the propeller blade sections are specified at the location of these dowels. They are usually spaced evenly, although in one of my Royal Aircraft Factory drawings they are not spaced at exact intervals. In the case of the T.6296 the dowels appear to be spaced 8 apart. The first line of dowels appear to be placed 7 3/4 from the centre of the boss. Once I correct the boss for shrinkage I suspect the dowels will move closer to 8 from the centre of the boss.
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Old 01-03-2021, 11:10 PM   #12
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Default The revised drawing. Note the much cleaner lines for the boss

The revised boss drawing. I will probably revise the half lap width again from 6 3/8 to 6 1/2. Hopefully I will be able to find an original T.6296 drawing, but 6 1/2 half laps give an overall diameter very close to the stated 2970mm. By extending each blade by about 1/8 I will be able to achieve the diameter of 2970mm stamped on an original T.6296 boss.

The second photo is of the jig for the angles of each lamination. It is sitting on the patterns I have made for the boss, and partial blades at various distances from the centre of the boss. The pattern traced from the trailing edge of the original T.6296 blade can be seen on the right hand side of the photo. It is also visible in other photos.
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File Type: jpg E9BA4C8E-8D8F-4B6A-BFBC-DD43A315D45C.jpg (95.3 KB, 6 views)
File Type: jpg 68E9E604-546C-472C-BB88-7CD0F6BCAD1C.jpg (93.4 KB, 8 views)

Last edited by Garuda; 01-04-2021 at 01:02 AM.
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Old 01-05-2021, 09:49 PM   #13
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Default Photos

Some photographs have just arrived, from my contact at the museum at Narromine. From the stamps it can be seen that it is an RE8 T.6296. At first I thought it was a BE2 propeller, but the stamps clearly read RE8 and T.6296. There are some inconsistencies with the boss in comparison to other T.6296 bosses I have studied. The diameter is less than 200mm, and all other T.6296 bosses I have examined are around 215 to 220mm diameter. The laminations and half laps are also inconsistent with other T.6296 bosses.

Last edited by Garuda; 01-06-2021 at 01:17 AM.
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Old 01-05-2021, 09:58 PM   #14
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Default More photos, RE8 T.6296

These photos confirm that this is a T.6296, and that it was fitted to an RE8. The tip has been doped in 1916 Scheme A PC10. Although the boss is stamped 1917, it is known that 1916 Scheme A PC10 was used throughout 1917 and 1918 in conjunction with later, much darker shades of PC10. There is an RE8 serial number on display in the same museum. It is mot known if the serial number was removed from the same RE8 as the propeller, and I will be very interested to see if it is also 1916 Scheme A PC10, or, as is much more likely the case a later shade of PC10.

Last edited by Garuda; 01-08-2021 at 02:00 AM. Reason: Added photo of RE8 stamp
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Old 01-08-2021, 09:47 AM   #15
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Default RE8 serial number C 2270

My friend sent me some more photos, including a photo of an FE2b propeller boss and a pair of Aldam Heaton propeller blade tips. I have posed photos of these in a new thread.

For anyone who is interested, here is the photo of the RE8 serial number I mentioned in the previous post. It has been removed from C 2270. It is difficult to tell from the photos if it is 1916 Scheme A PC 10 or not. It is certainly a bright green, as 1916 Scheme A PC 10 is, but it is darker than all 1916 Scheme A PC 10 samples I have seen. I know from one of my samples that this early version of PC 10 was varnished. Many samples are brown due to discolouration of the varnish. The underlying PC 10 is a light, bright green. The PC 10, if indeed that's what it is applied to the RE8 propeller blade tips is typical of the appearance of 1916 Scheme A PC 10 when the varnish covering it has weathered and discoloured. I hope to travel to the museum, and study these and all other WW1 aircraft related relics.
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File Type: jpg RE8 serial number Narromine Museum C 2270.jpg (94.9 KB, 8 views)
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Old 01-15-2021, 08:51 AM   #16
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Default Calculating the pitch and lamination 2

I spent a few days thinking about how I could calculate the pitch, and deciding how to determine the shape of lamination two, which I have cut today. I am primarily working on the first specified profile, which is about 8, or 8 1/8 from the centre of the boss. I will be able to determine this measurement more precisely as I progress along the entire blade. Mike spent the last ten days at the museum, and took some key measurements for me. With a bit of luck, he was able to trace the edge of the boss and at least two blade trailing edges. I have been having trouble working out the exact location of the trailing edge. The information available from different parts of different propellers contradict each other. The complete T.6296 in Narromine is currently the only complete T.6296 I am aware of and have access to. Consequently, information from it will carry a lot more weight than information I have been able to source from other incomplete propellers.

From analysing the pitch of the T.6296 it is evident that it has been designed in millimeters. The pitch, 3040mm is very close to 10. I am using 19mm Radiata Pine. Interestingly, other Royal Aircraft Factory drawings I have specify 3/4 timber boards. The difference between 3/4 and 19mm is negligible, but there is a difference. Although 3/4 timber is specified, I am very confident that the Royal Aircraft Factory engineers used 3/4 interchangeably with 19mm. To complete a full revolution, the propeller needs to travel forward exactly the equivalent of 160 laminations, which are 19mm thick. This also gives a very nice figure to work with, 2.25 degrees of rotation per lamination. I cut some pieces of timber which hinge at the centre of the boss and extend to the first profile, 8 from the centre. Because I am not yet sure of the exact measurement, I have cut these pieces of timber a bit longer, at 8 1/4. Later, I will cut and / or sand them to a much more precise measurement. I am very happy with the pitch at the first profile. I can check it mathematically before I determine the size of the blade profile at that location.

Last edited by Garuda; 01-15-2021 at 10:50 AM.
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Old 01-18-2021, 03:58 AM   #17
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Default Estimated shape of section 1

I have drawn the pitch at the correct angle and drawn the estimated shape of the propeller blades at section 1, approximately 8 1/8 from the centre. I have a photo of a T.6296 which has been cut off at this location, or very close to it. It is a good match. I will check my patterns against the original T.6296 when I am able to travel and study it. This area of the propeller is where I have the least information, so determining the blade sections as I get closer to the tip will be much easier.
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File Type: jpg 8EFC64A7-C84F-4E87-B047-B5A53A5C9991.jpg (90.7 KB, 2 views)
File Type: jpg DF55F422-D930-408E-A158-3F4898DB3B60.jpg (91.9 KB, 2 views)
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Old 01-19-2021, 03:36 AM   #18
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Default

Here's another on ebay.
'R.A.F. Wooden propeller hub from a WW1 British Reconnaissance/Light Bomber 1916'
That's the heading I can't seem to find the item number.
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Old 01-19-2021, 04:22 AM   #19
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Default RAF propeller hub on eBay

Thank you very much for letting me know. I searched eBay, using the phrase you posted but I was not able to find it. If you would not mind copying the link, pressing the Manage Attachments button and pasting it into the Upload File from a URL box, that would be greatly appreciated, thank you. I see plenty of them on eBay, but I can't always afford them!

Thanks,

David.
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Old 01-19-2021, 02:06 PM   #20
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Every time I try and post the link it says it's spam and won't let me.
The phrase is copied and pasted from the ebay listing and works when I copied and pasted it back.
Maybe try ebayuk.
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