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  #126  
Old 9th December 2017, 15:04
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I'm not sure my post #112 fits in the clarification comments either! I was only quoting Malcolm's post to add further information about why this engine was designed. I have posted diagrams and links to information about the Napier Deltic elsewhere.
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  #127  
Old 10th December 2017, 08:56
Tony Skilton New Zealand Tony Skilton is offline
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Got to agree Malcolm - the sound is definitely different! I have only heard them on rail traction.
Just clearing out all my marine records & notes and found an item on high-speed technology relating to the Deltic development.
As said, the engines were originally developed as a marine engine to replace the high speed & very explosive petrol engines in MTBs & MGBs.
But the roots go back to Hugo Junkers in 1889, when he built his first opposed piston diesel engine prototype. By 1892, at Dessau, he had his first double-piston production engine ready, and took out Patent No. 66961 to cover his work. Junkers later granted their licences to Doxford, Fairbanks Morse, and many other manufacturers.
Napier took out the licence in 1930 to build the opposed-piston Jumo 203 & 204 engines, which they called the 'Napier Culverine'. However, work ceased when war broke out, but then Napier was asked to produce a light-weight, compact diesel for marine use, and came up with the idea of joining 3 x 'Culverines' together in a triangular configuration, and so the 'Deltic' was born.
Although appearing to be a very complex 2-stroke, it was in fact a very reliable engine, with 18 cylinders & 36 pistons. A smaller version of 3 banks of 3 cylinders/bank was also produced for power generation for the minesweepers. The Junkers Jumo 205 and 223 engines share many features of the supercharged Deltic engine, some of which produced up to 1838 Kw per engine, with the later turbocharged versions producing up to 2280 Kw each.
The last 5 newly-manufactured Deltics were built in 1982, but Napier (later incorporated into Paxman, then English Electric, then Rustons), spent much time rebuilding these engines well into the current century.
Skilly

Last edited by Tony Skilton; 10th December 2017 at 22:26.
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  #128  
Old 10th December 2017, 11:21
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Yes I can remember that distinctive sound of the railway engines. It was a sort of 'get out of the way, Deltic coming through' sound.
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  #129  
Old 10th December 2017, 22:28
Tony Skilton New Zealand Tony Skilton is offline
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Yes - the power strokes (read 'exhaust pulses') were so close together that it could almost sound like a slow-firing machine gun.
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  #130  
Old 30th December 2017, 22:29
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When I was working on the roof of the restoration garage earlier this year I took this pix of one of the mechanics beautifully kept Kwacker Ninja.

The dog belonged to the garage owner, and was very friendly. But I think the mechanic had him trained to keep an eye on his bike because those eyes never left me as I admired it.

Good looking bike and dog I think.
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File Type: jpg Ninja.jpg (204.0 KB, 17 views)
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