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Old 08-16-2014, 10:04 PM   #1 (permalink)
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Propeller vs Direct drive

Off the wall question;
What is the difference in efficiency between propulsion from a propeller vs a direct traction drive (wheels, including drivetrain losses)?

My research lead me to some odd vehicles, and more questions as usual.




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Old 08-16-2014, 10:36 PM   #2 (permalink)
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More fun


http://www.dailymotion.com/video/xfn...ler-car_travel












Prob fun for its own thread
http://www.techvert.com/wind-powered...than-the-wind/
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Last edited by Superfuelgero; 08-17-2014 at 02:48 AM..
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Old 08-16-2014, 11:13 PM   #3 (permalink)
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True, I'm thinking around 45-70% of direct depending on pitch. Not sure though.
Using
ηp=T∗u/Pshaft

A bad amount for mpg. The project places too much priority on weight though.










Lotus


























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Old 08-17-2014, 08:00 AM   #4 (permalink)
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Screw the cars, now an air train, thats front page news. Trains doesnt have much traction, thats why they are soo efficient. They use sand to air in starting off and braking as traction is soo limited due to what little contact all that weight makes with the rails and wheels.

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Old 08-19-2014, 01:24 AM   #5 (permalink)
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I don't see it coming to a mass-production car, maybe a turbine-propelled one would make more sense nowadays.


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Originally Posted by Cobb View Post
Screw the cars, now an air train, thats front page news. Trains doesnt have much traction, thats why they are soo efficient. They use sand to air in starting off and braking as traction is soo limited due to what little contact all that weight makes with the rails and wheels.

I wonder if the propeller could even help to improve braking, let's say, if it could be easily reversed in order to act as an aerodynamic brake.
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Old 08-19-2014, 02:49 AM   #6 (permalink)
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Is there any gyroscopic effect?

As for efficiency, I expect it's much less efficient than a direct drive in stop and start driving, and I wonder what it would be like to drive behind a propellor driven vehicle in traffic!
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Old 08-19-2014, 03:53 AM   #7 (permalink)
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With enough back wind a propeller is better.
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Old 08-19-2014, 08:00 AM   #8 (permalink)
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From what I remember about propellers, I think it was around 59% energy transfer before it was easier for the air to move around the propeller.

The big advantage is not relying on the wheels for traction, like has been stated, and in the old magazine clippings that is what was stated as well, ideal for low traction areas like mud, grass, ice.

When I've driven an air boat, that is a boat with a flat bottom and a large prop in the back, it was very much a fluid drive, like driving a vehicle with a very loose automatic transmission.
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Old 08-19-2014, 01:57 PM   #9 (permalink)
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It would at least discourage tailgating :-)
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Old 08-19-2014, 05:49 PM   #10 (permalink)
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Then you take your propeller driven car to a restaurant on a sunny warm autumn day.
You find a vacated but narrow parking slot under the trees close to the tables where people dine. It takes some manoevring back and forth to fit nicely in that slot.

You'd better leave a big tip.

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