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Kcfirebolt
| Posted on Monday, March 03, 2014 - 12:45 pm: |
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Just thought this was cool. http://pixelbark.com/13045/how-the-duke-engines-in creases-the-efficiency-of-the-internal-combustion- engine |
Sifo
| Posted on Monday, March 03, 2014 - 01:03 pm: |
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I thought this was going to have something to do with KTM! Still pretty cool. Looks like a good deal of rotating mass is involved. That may be problematic for some applications. Not so much for other applications. I wonder how they get a good durable seal between the cylinder and the head? |
Oldog
| Posted on Monday, March 03, 2014 - 03:16 pm: |
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reminds me of a variable displacement hydraulic pump. Seems like they trade a rotating cylinder block for the valve train. I would perhaps incorrectly guess that the moving parts total weight is higher in the duke engine as the actuator and cylinder block has to weigh more than a set of cams and related hardware... |
Hootowl
| Posted on Monday, March 03, 2014 - 03:50 pm: |
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How is this different than an axial engine? I'm at work, and couldn't have the sound up. If they said something about this in the video, I'm afraid I missed it. |
Tq_freak
| Posted on Monday, March 03, 2014 - 04:21 pm: |
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pretty cool, its like a standard ICE and a Wankle had a baby. Like its been said I would worry about the cylinder to head seal and also the CV type joint at the crank shaft. |
Griffmeister
| Posted on Monday, March 03, 2014 - 09:44 pm: |
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I agree, a Wankel with pistons. Mazda put their engine in production vehicles before they really had durable seals, but they did get it to work after a few years. Maybe the "Duke" just needs a real life test bed to develop it's potential. |
Aesquire
| Posted on Monday, March 03, 2014 - 10:25 pm: |
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I wonder about friction. If you want real insane complexity, the Napier Sabre was a sleeve valve engine built & nigh perfected by the Brits in WW2. http://en.wikipedia.org/wiki/Napier_Sabre The piston rides in a sleeve, which has ports ( like a 2 stroke ) which in turn rides in the cylinder, which also has ports. The head is nearly flat with just a spark plug. The sleeve goes up & down and rotates back & forth in the cylinder, driven by a little cam/crank thing..... http://auto.howstuffworks.com/sleeve-valve-engine. htm btw, the animation shows 2 sleeves, which is not needed afaik. Napier didn't. So just imagine the outer sleeve as the cylinder, and go from there. You may notice a lack of these engines in cars. ( even though they Began in the US built Knight ) This Duke engine looks interesting. I bet they are working hard to sell it for drones. ( Everyone Is Working Hard to sell their engines for drones ) There's been an axial engine promised for airplanes for years. Haven't seen one for sale that actually runs though, seems to be stuck forever in R&D. |
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