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  #1  
Old 08-06-2011, 04:19 PM
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Cool Animation on How Rotary Engines work

It's pretty neat and well done http://www.dump.com/2011/08/05/how-a-rotary-engine-work-video/
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  #2  
Old 08-06-2011, 04:54 PM
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Nice.
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  #3  
Old 08-06-2011, 05:00 PM
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I've always been a big fan, having owned an RX7 convertible. Despite only "3 moving parts" it's not an efficient design - the problems will always be low torque and high heat output. But one reviewer describes revving the rotary through the gears as like running a chain saw through fiberglass. That's very accurate, and so much fun. Everyone should get the opportunity to at least drive one.
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Old 08-06-2011, 05:22 PM
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I have difficulty following how the crank makes 3 rotations for each rotor cycle.

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  #5  
Old 08-06-2011, 05:44 PM
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Quote:
Originally Posted by sixto View Post
I have difficulty following how the crank makes 3 rotations for each rotor cycle.

Sixto
87 300D
I think you may have that backwards....there are three combustion cycles for each revolution--one for each of the three "sides" of the rotor . At least that is how I have understood it.
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Old 08-06-2011, 05:50 PM
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Quote:
Originally Posted by sixto View Post
I have difficulty following how the crank makes 3 rotations for each rotor cycle.

Sixto
87 300D
There are 3 rotor faces, and each one sees combustion. The crank of course has to be at TDC for each combustion event. So BANG-BANG-BANG, 3 spins of the crank.

That is why the torque is so low, but the crank output speed is 3 times faster than the rotors are actually turning.
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Old 08-06-2011, 06:00 PM
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Quote:
Originally Posted by raymr View Post
There are 3 rotor faces, and each one sees combustion. The crank of course has to be at TDC for each combustion event. So BANG-BANG-BANG, 3 spins of the crank.

That is why the torque is so low, but the crank output speed is 3 times faster than the rotors are actually turning.
If that is true, then my understanding is wrong. Oh well, I've been wrong before, ( often, or even always, according to some on OD)
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Old 08-06-2011, 06:39 PM
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I think my difficulty is that I envision the rotor turning the eccentric. In fact the rotor pushes the eccentric with sliding contact.

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87 300D
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  #9  
Old 08-06-2011, 06:43 PM
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Here's the 'real' (i.e. first) rotary engine. Saw one in person yesterday.

http://www.animatedengines.com/gnome.shtml
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  #10  
Old 08-06-2011, 06:51 PM
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Isn't that a radial engine regardless of what's fixed and what rotates?

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  #11  
Old 08-06-2011, 07:02 PM
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Quote:
Originally Posted by sixto View Post
Isn't that a radial engine regardless of what's fixed and what rotates?

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87 300D
No. A radial engine has a turning crankshaft and fixed block. Rotary has a fixed crankshaft and turning block.
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  #12  
Old 08-06-2011, 07:07 PM
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Quote:
Originally Posted by Aquaticedge View Post
OHHHH! You mean a WANKEL engine...... Named after my Uncle Felix Wankel; inventor of the 'Wankel stroke engine'.
His name was not "Felix Rotary".

Like Kerry said; A 'Rotary' is like WW1 airplane engine; the mass turns around a stationary crankshaft.
And No it is not called a radial engine;... when the crankshaft turns then it is a 'radial' layout.

Yes I am being an Ass. But Uncle Felix would take issue with his invention.
..
.
I overhauled a Wankel engine in 1976; it bent my brain seeing how it worked with the side housing off.
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Old 08-06-2011, 07:15 PM
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A Radial engine....just to complete the discussion.
http://www.youtube.com/watch?v=4hWZ40120BQ&feature=related
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  #14  
Old 08-06-2011, 07:38 PM
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Quote:
Originally Posted by Matt L View Post
I remember seeing one of these, years ago:

http://www.suzukicycles.org/RE5/RE5-Rotary.shtml

Never saw one again.
Knew a guy who owned one along with a flying car.
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  #15  
Old 08-06-2011, 07:53 PM
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That's an older video, I guess. The current rotary powered car sold in the US for the last 6 or 8 years-the RX-8- has exhaust ports in the side housings that look much like the intake ports.
The first engine Wankel built had a stationary eccentric shaft and the rotor housings rotated around it. That was quickly improved to the planetary type engine we have today.
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