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Old 08-17-2018, 11:18 PM   #61 (permalink)
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It's all about the frontal area.

OSI SIlver Fox:

http://www.velocetoday.com/wp-conten...7/4Z5U5258.jpg

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Old 08-18-2018, 02:58 PM   #62 (permalink)
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Did the Abarth have a rear engine ?
Looks like cooling scoops ...

On the Prius, it looks a roof indent rather than a bubble - trying to keep the air on the roof instead of spilling over to the sides ?
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Old 08-18-2018, 04:43 PM   #63 (permalink)
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Abarth built on IIRC Fiat and Simca chassis. I'd call the Prius a Pagoda Roof , like the Mercedes 240-300SL. It's opposite to the Dan Gurney bubble:

https://www.thetruthaboutcars.com/20...urneys-bubbly/
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Old 08-18-2018, 08:54 PM   #64 (permalink)
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Gurney "bubble" was so a 6-foot-4-inch driver could physically "fit" into the cockpit and behind the wheel, it had nothing to do with aerodynamics.
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Old 08-18-2018, 11:31 PM   #65 (permalink)
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The pagoda roof is also not. It has to do with ingress/egress.

edit:
My favorite aero oddity for today; a brick shaped trailer.


http://justacarguy.blogspot.com/2018...-of-color.html
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Old 08-23-2018, 11:27 AM   #66 (permalink)
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MORE random pics...... - Page 4560 - Pelican Parts Forums


Still fluid dynamics, right?
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Old 08-23-2018, 01:00 PM   #67 (permalink)
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Quote:
Originally Posted by kach22i View Post
Still fluid dynamics, right?
Sure, since the rudder of a ship still has a similar function to the one in an aircraft
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Old 08-23-2018, 04:07 PM   #68 (permalink)
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It's interesting. I presume the blister on the leading edge is to reduce leeward turbulence. But why the step above and below it?

Oh no, Pelican Parts thread, there goes the rest of my afternoon.
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Old 08-24-2018, 01:57 PM   #69 (permalink)
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Quote:
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It's interesting. I presume the blister on the leading edge is to reduce leeward turbulence. But why the step above and below it?

Oh no, Pelican Parts thread, there goes the rest of my afternoon.
Notice as well, a slight twist at the top root.

This rudder is also acting like a vane straightening stator.

I'm assuming the smaller lower section is simply to reduce the stress, a cantilever moment arm is what the rudder actually is.

Remember, the swirling rotation of the water coming off the prop is best met at by right angles. However if they did that it would turn really well in one direction, and not at all in the other direction. This design is a compromise of some sort.

https://www.cambridge.org/core/journ...91B3DCBB77B7FE


http://www.wavefront.co.jp/CAE/PumpL...propeller.html




http://www.hhscott.com/evinrude/choosing_a_prop.htm
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Last edited by kach22i; 08-24-2018 at 02:06 PM..
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Old 08-24-2018, 05:41 PM   #70 (permalink)
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I'm gathering parts for a 1Kw gravity vortex watermill. I've got a washing machine motor, a housing made from parts (a dog kennel and a ventilator!) and two outboard motor propellers to choose from (3-blade metal and 6-blade plastic). All I need now is a shaft to connect the propeller to the motor/generator and an optional extension tube that necks down from 14" to ~7".

Do you think it would be better to square the tips of the blades and put it in a duct, or leave the tips and put it below the end of the duct?

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