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Junkers CLM twin cylinder diesel engine


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CLM (Compagnie Lilloise Moteurs) were  a subsidiary of Peugeot and the French licensees of the Junkers patent opposed piston two stroke.  Most commonly found in the JUMO range of aero engines.

 

N

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2 minutes ago, BEngo said:

CLM (Compagnie Lilloise Moteurs) were  a subsidiary of Peugeot and the French licensees of the Junkers patent opposed piston two stroke.  Most commonly found in the JUMO range of aero engines.

 

N

 

Yes I imagined it was a two stroke.  There is a video on youtube of one running and it sounds like a single cylinder with every bang evenly spaced, whereas a four stroke twin has the bangs in pairs. 

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2 minutes ago, BEngo said:

You can get the bangs evenly spaced in  a 2 cylinder four stroke.  AKA a 360 deg twin.  The engine is likely to want to jump up and down a lot though.

 

N

But still not as much as a Bolinder... 😉

 

I wish I'd videoed the ex-working boat we shared a lock with on the Trent, the whole stern was moving up and down by a couple of inches...

Edited by IanD
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1 hour ago, IanD said:

But still not as much as a Bolinder... 😉

 

I wish I'd videoed the ex-working boat we shared a lock with on the Trent, the whole stern was moving up and down by a couple of inches...

Quite impressive isn't it.

 

We came down from Braunston to Weedon with "George" a few years ago.  The whole boat was noticeably hopping up and down in time with its Bolinder in the locks.

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1 hour ago, IanD said:

 

I wish I'd videoed the ex-working boat we shared a lock with on the Trent, the whole stern was moving up and down by a couple of inches...

Sometimes on an unconverted boat, it's not just the stern bouncing up and down, but you can see the twist imparted to the hull each time the engine fires. At certain speeds you get a resonance where the bows are twisting 180 degrees out of phase with the stern. No idea what that does to the joints on a wooden boat!

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16 minutes ago, David Mack said:

Sometimes on an unconverted boat, it's not just the stern bouncing up and down, but you can see the twist imparted to the hull each time the engine fires. At certain speeds you get a resonance where the bows are twisting 180 degrees out of phase with the stern. No idea what that does to the joints on a wooden boat!

 

Something that rhymes with "sugared", I expect... 😉

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1 hour ago, David Mack said:

Sometimes on an unconverted boat, it's not just the stern bouncing up and down, but you can see the twist imparted to the hull each time the engine fires. At certain speeds you get a resonance where the bows are twisting 180 degrees out of phase with the stern. No idea what that does to the joints on a wooden boat!

The Cowburn and Cowpar motor boat "Swan" will do this quite happily when the Gardner semi is at a particular speed.  As a composite motor only the bottoms are affected, but I am assured that the caulking does not much like it.

 

I suspect that a twisting motion will be harder to achieve and to sustain with a Bolinder, because the speed  governing off load is so slack.

 

N

 

 

 

 

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