RMweb Gold Ramblin Rich Posted May 2, 2020 RMweb Gold Share Posted May 2, 2020 Romanes eunt domus 2 Link to post Share on other sites More sharing options...
RMweb Premium Northmoor Posted May 2, 2020 RMweb Premium Share Posted May 2, 2020 On 01/05/2020 at 15:49, rockershovel said: Brutus sic in omnibus Hopefully he was asked to clean it afterwards. 4 Link to post Share on other sites More sharing options...
RMweb Gold Hroth Posted May 2, 2020 RMweb Gold Share Posted May 2, 2020 (edited) On 23/04/2020 at 10:33, PenrithBeacon said: 'Piston Engine' is just aviation terminology for a reciprocating internal combustion engine, not so different except perhaps in size from the engine in most cars, excepting diesels of course. Then again, the R101 airship had diesel engines because the fuel was less flammable. Sadly, the power to weight ratio of the diesels was terrible compared to the petrol ones in R100. The lack of power was probably a contributory factor to the fatal crash on its maiden voyage. Other more important factors included the disintegrating fabric cover, the leaking gasbags and the stupidity of attempting the flight in the teeth of a gale just so the chap in overall charge of the project could fly to India in it to take up an Imperial posting... btw, I'm going on what Nevil Shute said about the whole "British Airship" project in his book "Slide Rule". As well as his writing career, he was the aeronautical engineer in charge of the stress calculations for the R100 frame. Edited May 2, 2020 by Hroth 3 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted May 2, 2020 RMweb Premium Share Posted May 2, 2020 There has been diesel aircraft engines. The WW2 Blomm and Voss flying boat was powered by three Junkers diesel engines. To keep the weight down they were opposed piston 2-strokes similar in principle to the Commer TS3. 2 1 Link to post Share on other sites More sharing options...
RMweb Premium Flying Pig Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 1 hour ago, PhilJ W said: There has been diesel aircraft engines. The WW2 Blomm and Voss flying boat was powered by three Junkers diesel engines. To keep the weight down they were opposed piston 2-strokes similar in principle to the Commer TS3. The Junkers engine was licensed by Napier as the Culverin and was a direct ancestor of the Deltic. The Culverin itself makes a nice power source for 1930s what-if diesel traction, such as posted by @Captain Electra in the early days of this thread. 3 Link to post Share on other sites More sharing options...
RMweb Premium melmerby Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 On 23/04/2020 at 11:08, Gibbo675 said: Hi Johnster, The nearest I could find to jet was jettison, in Latin eicere - jettison, although the adverb ductim means in streams. Likely as in that the gas flow is streamed in the way that petrol is jetted into a carburettor. Gibbo. If you have an etymological English dictionary the derivations are already there Mine states that Jet comes from the Latin "jactare" , to throw repeatedly, which in turn is from "jacere" to throw. 2 1 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 9 hours ago, Flying Pig said: The Junkers engine was licensed by Napier as the Culverin and was a direct ancestor of the Deltic. The Culverin itself makes a nice power source for 1930s what-if diesel traction, such as posted by @Captain Electra in the early days of this thread. Austin was also working with Junkers to develope a diesel engine for their lorries. A two cylinder 2-stroke opposed piston unit. They had built a prototype ready for testing in August 1939 but then it had to be dropped for obvious reasons. 3 Link to post Share on other sites More sharing options...
RMweb Gold rodent279 Posted May 3, 2020 RMweb Gold Share Posted May 3, 2020 11 hours ago, Flying Pig said: The Junkers engine was licensed by Napier as the Culverin and was a direct ancestor of the Deltic. The Culverin itself makes a nice power source for 1930s what-if diesel traction, such as posted by @Captain Electra in the early days of this thread. How does an opposed piston design keep the weight down? Surely you need two or more crankshafts? 2 Link to post Share on other sites More sharing options...
rockershovel Posted May 3, 2020 Share Posted May 3, 2020 2 minutes ago, rodent279 said: How does an opposed piston design keep the weight down? Surely you need two or more crankshafts? Like this; I’ve never really understood how they work, but they DO work, which I suppose is the main thing. 3 1 Link to post Share on other sites More sharing options...
Gibbo675 Posted May 3, 2020 Share Posted May 3, 2020 4 minutes ago, rodent279 said: How does an opposed piston design keep the weight down? Surely you need two or more crankshafts? Hi Neil, As there is no cylinder head or valve gear train because they are piston ported that saves the weight. Gibbo. 1 2 Link to post Share on other sites More sharing options...
RMweb Gold rodent279 Posted May 3, 2020 RMweb Gold Share Posted May 3, 2020 22 minutes ago, Gibbo675 said: Hi Neil, As there is no cylinder head or valve gear train because they are piston ported that saves the weight. Gibbo. Ok, yes, that makes sense 1 Link to post Share on other sites More sharing options...
PenrithBeacon Posted May 3, 2020 Share Posted May 3, 2020 14 hours ago, PhilJ W said: There has been diesel aircraft engines. The WW2 Blomm and Voss flying boat was powered by three Junkers diesel engines. To keep the weight down they were opposed piston 2-strokes similar in principle to the Commer TS3. True, and there were applications before that, but diesel engines were too heavy in an aeronautical context. 1 Link to post Share on other sites More sharing options...
RMweb Premium Flying Pig Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 1 hour ago, rodent279 said: Ok, yes, that makes sense Even more weight saved if you share crankshafts between adjacent cylinders... 1 1 Link to post Share on other sites More sharing options...
RMweb Premium Northmoor Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 2 hours ago, rockershovel said: Like this; I’ve never really understood how they work, but they DO work, which I suppose is the main thing. And if you connect two further banks of pistons to a third crankshaft, you get a.......... 1 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 4 hours ago, Gibbo675 said: Hi Neil, As there is no cylinder head or valve gear train because they are piston ported that saves the weight. Gibbo. And greater thermal efficiency. 1 Link to post Share on other sites More sharing options...
RMweb Premium Flying Pig Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 Some info about the Napier Culverin here. I wonder if the smaller version would fit horizontally under a DMU? Perhaps a mixture of Baby Deltics and Napier-engined Cravens sets would have given GN suburban services the puissant traction they needed in the years before electrification. 2 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted May 3, 2020 RMweb Premium Share Posted May 3, 2020 3 minutes ago, Flying Pig said: Some info about the Napier Culverin here. I wonder if the smaller version would fit horizontally under a DMU? Perhaps a mixture of Baby Deltics and Napier-engined Cravens sets would have given GN suburban services the puissant traction they needed in the years before electrification. The Rootes group were experimenting with additional cylinders on the TS3 engine. Indeed there was a TS4 engine up and running when Chrysler took over and squashed any further developement. Five and six cylinder versions were being considered. A 'TS6' would easily fit under the floor of a DMU. The main drawback of two stroke diesels was noise levels. 1 1 Link to post Share on other sites More sharing options...
rockershovel Posted May 4, 2020 Share Posted May 4, 2020 13 hours ago, Northmoor said: And if you connect two further banks of pistons to a third crankshaft, you get a.......... Makes me cross-eyed just watching it.. https://gfycat.com/beautifulbronzeindri 3 Link to post Share on other sites More sharing options...
RMweb Premium John Besley Posted May 5, 2020 RMweb Premium Share Posted May 5, 2020 I have been scrolling through this fascinating thread.. ( is there a picture gallery for this one) and remember someone back in the 70's building a L&Y Hughes 2-10-0 using a 9F chassis the article appeared in MRC from what I remember... 1 Link to post Share on other sites More sharing options...
RMweb Premium Flying Pig Posted May 7, 2020 RMweb Premium Share Posted May 7, 2020 On 05/05/2020 at 20:16, John Besley said: I have been scrolling through this fascinating thread.. ( is there a picture gallery for this one) and remember someone back in the 70's building a L&Y Hughes 2-10-0 using a 9F chassis the article appeared in MRC from what I remember... See page 108 of this extensive ramble: You might also like Michael Edge's Horwich Mallet: 1 Link to post Share on other sites More sharing options...
micknich2003 Posted May 7, 2020 Share Posted May 7, 2020 The L&YRly 2-10-0 was a two part article by the late Dennis Allenden in "Model Railways sometime in the '70's 1 1 Link to post Share on other sites More sharing options...
62613 Posted May 8, 2020 Share Posted May 8, 2020 On 01/05/2020 at 15:49, rockershovel said: Brutus adsum iam forte Caesar aderat Brutus sic in omnibus Caesar sic in at Should watch what they drink, then! 1 Link to post Share on other sites More sharing options...
62613 Posted May 8, 2020 Share Posted May 8, 2020 On 03/05/2020 at 16:15, Northmoor said: And if you connect two further banks of pistons to a third crankshaft, you get a.......... A slight loss due to having to drive the mechanical charge air blower, though. Chain-driven? 2 Link to post Share on other sites More sharing options...
scots region Posted May 8, 2020 Share Posted May 8, 2020 I've been wondering what the impact would be if a rail bridge was built across the english channel in the 1890s. How would the evolution of 20th century locomotive design have been altered by a direct continental influence. 2 Link to post Share on other sites More sharing options...
Ohmisterporter Posted May 8, 2020 Share Posted May 8, 2020 Probably there would have been an island mid-channel where the twelve mile British Channel Bridge met the twelve mile French Channel Tunnel. 3 Link to post Share on other sites More sharing options...
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