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Post by Dave Homewood on Nov 20, 2019 20:50:56 GMT 12
This technique may come in handy
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Post by isc on Nov 20, 2019 22:14:14 GMT 12
I use a mix of citric acid powder and water for both steel and copper alloys, good for cleaning up copper after brazing, safer than the stronger acids often used. isc
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Post by agile on Nov 21, 2019 9:15:32 GMT 12
We use molasses for steel parts. It has some drawbacks (slow, grows mould) but produces great results, is cheap and environmentally friendly.
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Post by kiwi285 on Nov 21, 2019 9:22:34 GMT 12
Here is the Avenger as she has sat for the last couple of months. 201119 by Mike Feisst, on Flickr
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Post by baz62 on Nov 22, 2019 13:37:03 GMT 12
Our exhaust pipes and propeller have arrived from Chino so we will be starting work on the Avenger again as well. Brilliant news! Do you know what propeller they ended up with? I always thought the Mitchell prop was a close match to the TBF one.
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Post by kiwi285 on Nov 22, 2019 15:48:50 GMT 12
The box arrived yesterday and was unpacked today. Looks like all of the exhaust system sections are there but it appears that we might be missing some gear rings that fir to the prop blades and the tapered rollers that support each blade. I believe that the prop is off a B-25 Mitchell which also had the Cyclone R2600 engines in it. Not sure what is happening now. IMG_3184 by Mike Feisst, on Flickr IMG_3187 by Mike Feisst, on Flickr IMG_3188 by Mike Feisst, on Flickr
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Post by planewriting on Nov 22, 2019 16:12:33 GMT 12
Certainly a great day at Classic Flyers; what with looking through what was in the consignment from Chino and watching Vampire NZ5751 start up twice. No doubt we will sort out, as we do, any problems we may have with missing parts. I too am of the understanding the prop is off a Mitchell.
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Post by baz62 on Nov 22, 2019 16:47:46 GMT 12
Regarding the missing parts, being Hamilton Standard you might find parts here as the C47/DC3 prop hub is probably identical or similar at least. I know we used a Dakota prop hub to replace the one on NZ2504. Actually Ray Pichon who is a Forum member on here got a Catalina Hamilton Standard prop. Still got it Ray?
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Post by tbf25o4 on Nov 23, 2019 9:29:46 GMT 12
Hi Baz, you correct we used a Hamilton Standard 22E50 hub from one of the spare Dakota ones that we had at Weedons
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Post by pjw4118 on Nov 23, 2019 9:36:45 GMT 12
With molasses , we have a lot of spent wash from the distillery and its given away to either farmers or restorers. To stop it going mouldy just add a bit of copper sulphate .
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Post by davidd on Nov 23, 2019 10:53:32 GMT 12
Re tbf2504's last post, I think he means prop hub type 23E50, not 22E50. That hub was used by a very large number of aircraft types and engine types including (as well as TBFs. Hudsons, and Catalinas), B-24/C-87 (Liberators), F4U (Corsair), most P-51 aircraft, F6F (Hellcat), Mosquito, Stirling, and Lancaster (although may have a different spline set up), B-17 (Fortress), A-35 (Vengeance), C-54 (Skymaster), A-20 (Havoc/Boston), PV-1 and PV-2 (Ventura/Harpoon), etc, etc. David D
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Post by emron on Nov 30, 2019 10:19:03 GMT 12
The B-25 propeller will be a Hamilton 23E50-505. The blades are DWG 6359A-18. They are the same pattern as the TBF-1 blade but 3 inches shorter (Prop diameter 12’-7” vs 13’-1” on TBF) They seem to be the closest available in current use. What model R-2600 do you have ?
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Post by tbf25o4 on Nov 30, 2019 11:26:20 GMT 12
David you correct dyslexic computer keyboard error on my part!
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Post by baz62 on Nov 30, 2019 15:42:36 GMT 12
What model R-2600 do you have ? I know the early B25 had the R2600-8 same as the TBF. More likely they have a later -20 series but I'd love to know.
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Post by isc on Nov 30, 2019 20:58:17 GMT 12
In a thread on the Model Engineer & Model Engineers Workshop web site, it has been found that molassas tends to etch cast iron. isc
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Post by kiwi285 on Dec 4, 2019 5:54:25 GMT 12
The B-25 propeller will be a Hamilton 23E50-505. The blades are DWG 6359A-18. They are the same pattern as the TBF-1 blade but 3 inches shorter (Prop diameter 12’-7” vs 13’-1” on TBF) They seem to be the closest available in current use. What model R-2600 do you have ? I will check today but I think it is a -20 engine again out of a Mitchell.
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Post by kiwi285 on Dec 5, 2019 16:32:00 GMT 12
The data plate has been stamped over and then someone has stamped in '35' We know it is a Mitchell engine so we think it is an R2600-35
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Post by emron on Dec 5, 2019 20:34:56 GMT 12
Looking back to Page 28 we thought it may have been a -29. It probably was built as that.
According to Joe Baugher: “TB-25N From November 1953 through December 1954, Hayes modified an additional 380 B-25Js as TB-25N. They were similar to the preceding TB-25Ls, but were fitted with R-2600-29A engines. Some of these were later modified as VIP transports under the designation VB-25N. Between 1952 and 1954, 979 B-25Js went through the Hayes Aircraft Company for IRAN (Inspect and Repair As Needed). These aircraft were equipped with such features as an automatic pilot, bomb bay fuel tanks, AN/ARN-14 radio gear, dual UHF/VHF, and demand oxygen systems. Sixty planes were fitted with the solid eight-gun nose shell in place of the original transparent nose. All were initially powered by R-2600-29 engines and Holley carburettors, although many were later fitted with Bendix Stromberg carburettors and the engines re-designated -35. “
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Post by davidd on Dec 6, 2019 7:04:48 GMT 12
Is that figure of 979 B-25s correct? David D
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Post by kiwi285 on Dec 6, 2019 13:43:42 GMT 12
Looking back to Page 28 we thought it may have been a -29. It probably was built as that. According to Joe Baugher: “TB-25N From November 1953 through December 1954, Hayes modified an additional 380 B-25Js as TB-25N. They were similar to the preceding TB-25Ls, but were fitted with R-2600-29A engines. Some of these were later modified as VIP transports under the designation VB-25N. Between 1952 and 1954, 979 B-25Js went through the Hayes Aircraft Company for IRAN (Inspect and Repair As Needed). These aircraft were equipped with such features as an automatic pilot, bomb bay fuel tanks, AN/ARN-14 radio gear, dual UHF/VHF, and demand oxygen systems. Sixty planes were fitted with the solid eight-gun nose shell in place of the original transparent nose. All were initially powered by R-2600-29 engines and Holley carburettors, although many were later fitted with Bendix Stromberg carburettors and the engines re-designated -35. “ Emron - you could well be right. The way the previous model numbers have been mutilated and then a 35 stamped above the mess would indicate that the engine has been upgraded and the model number ended up as a -35.
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