Subject:
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Re: Rotary Engine Help
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Newsgroups:
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lugnet.build.military
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Date:
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Fri, 2 Nov 2001 14:52:43 GMT
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Viewed:
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1622 times
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In lugnet.build.military, William R. Ward writes:
>
> Another type of rotary engine? The one I know of is called the Wankel Rotary
> Engine, and is something completely different - it has no cylinders or pistons
> at all. I'm unclear on exactly how the Wankel engine works, but it's quite
> unlike traditional engines. Mazda produced a variety of cars using this engine
> under the "RX" label, the most famous being the RX-7 sports car. They also
> produced pick-up trucks (remember the "ROTARY POWER" on the back of the
> tailgate in the '70's?) with these engines. I don't think they still make any
> cars with this engine; I believe the RX-7 was discontinued a few years ago.
In the Wankel engines, the cylinder is a shallow ellipse )maybe a circle)
amd the piston is a triangular thing that revolves inside the cylinder. Due
to the funky geometry between the cylinder and piston, you get intake,
compression, power and exhaust cycles. A picture would explain it very well.
Audi also had some sort of radial engine, I think a 5 cylinder, recently.
>
> Anyway, your description of the rotary engine is probably what led to the
> suggestion of putting a Technic gear on the propeller shaft. But I don't think
> that the PB4Y-2 had that type of engine; it sounds like that was a WWI era idea.
I think the inherent flaws in the rotary engine design (very leaky) made
them obsolete by the 1920s.
>
> I would guess that the reason for having the engine rotate with the propeller
> would be to avoid the need for a heavy flywheel. Early internal combustion
> engines required a big flywheel to keep momentum between firing of the
> cylinder(s), and that design of a rotaty engine would probably weigh less than
> a conventional engine of the day. Just a guess though.
You are probably right.
>
> > I built a model of a DH2, with a rotray engine,
> > http://www.frontiernet.net/~ghaberbe/legodh2.htm . I should take better
> > pictures, this MOC still exists.
>
> Very cool model; I'd love to see better pictures. It's hard to see how you
> modeled the engine, for example.
>
> --Bill.
My daughter and I can try this tonight.
Thanks,
George
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Message has 1 Reply:
 | | Re: Rotary Engine Help
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| (...) I believe the Audi/VW 5-cylinder engine is an inline 5. The later model Vanagons had it, and the earlier Eurovans. The newer Eurovans have a V6, IIRC. Or maybe it's an optional thing, where you can pick the engine when you buy the car. (...) (...) (25 years ago, 3-Nov-01, to lugnet.build.military)
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Message is in Reply To:
| | Re: Rotary Engine Help
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| (...) That's a pretty clever design. Maybe I can do something with that. (...) Another type of rotary engine? The one I know of is called the Wankel Rotary Engine, and is something completely different - it has no cylinders or pistons at all. I'm (...) (25 years ago, 1-Nov-01, to lugnet.build.military)
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