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Old 11-10-2018, 07:39 AM   #2881 (permalink)
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Sort of in the realm of aerodynamics...

Tatra made a V8 T603 race car, and removed the parasitic load of the cooling fans from the air-cooled engine.

How did they keep it cool, you might ask?


Those big honking exhaust pipes are actually exhaust extractors, basically venturis that act something like the "air multiplier" on those Dyson bladeless desk fans to suck air though the engine. Voila, an extra chunk of HP not used by the cooling system!

https://www.carthrottle.com/post/wybmg98/

I always wondered if someone could run something similar on a air-cooled VW engine.


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Old 11-10-2018, 09:17 AM   #2882 (permalink)
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Quote:
Originally Posted by samwichse View Post
Those big honking exhaust pipes are actually exhaust electors, basically venturis that act something like the "air multiplier" on those Dyson bladeless desk fans to suck air though the engine. Voila, an extra chunk of HP not used by the cooling system!
That's got to have some limitations, otherwise it's use would have been more widespread, right?

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https://www.fleetio.com/blog/giving-...amic-advantage


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You can already see the widespread advancement of aerodynamics by major manufacturers. New models by Ford, GM, and Volvo are sporting thoughtfully designed features like front grill shutters, streamlined mirror covers and enhanced ground effects.

For tractor trailers, there are a number of add-ons that can make the rig slicker going down the road. These include side skirts, rear covers and fairings - all having the objective of keeping the air flow as laminar (non-turbulent) as possible. You will see a lot of focus on decreasing wheel exposure, as spinning air surrounding them creates a profile much larger frontal area than the tire size implies.
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Old 11-10-2018, 02:55 PM   #2883 (permalink)
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Quote:
Originally Posted by samwichse
Sort of in the realm of aerodynamics...
Aerodynamics isn't just for the outside.

Thanks for posting that. The only example I knew of was a b&w photo in Popular Mechanix Illustrated in the 1960s. I'd never found it again. It was a Porsche racer in the 1950s and had large boxes behind each rear wheel. Probably not popular because... no muffler.

I believe Beetle produce about 1500cfm of exhaust and 1500cfm of hot air. My design has a megaphone header with an upturn into a bell Coanda nozzle at the back of the boat tail:

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Old 11-13-2018, 12:59 PM   #2884 (permalink)
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I forget whether or not the Rimac C2 has been included on this thread, yet, or not.





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Old 11-14-2018, 09:03 AM   #2885 (permalink)
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Quote:
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I forget whether or not the Rimac C2 has been included on this thread, yet, or not.
I don't remember either, but it is cool - and looks to be aerodynamic despite the many air inlets and rear wing.
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Old 11-17-2018, 07:10 PM   #2886 (permalink)
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105 lbs, 901 mpg built by High School students. I found it posted in a Timber Frame forum in the O.T. section (forestryforum.com).

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901 MPG Car Built by High School Students (Elroy1)
https://www.youtube.com/watch?time_c...&v=dmcRHtIQ4jA
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901 MPG Car Built by High School Students The Evansville, Indiana High School entry for the Shell Eco Marathon performed at an efficiency of 901 miles per gallon of gasoline in the 2016 Eco Marathon this year. It also placed 4th Globally! Congratulations guys! Stay tuned for the BFATE for some special guests and some drift-car action!
April 14, 2015
A different kind of hot-rodding: 2015 Shell Eco-marathon brings hyper-efficiency to Detroit
The 3,421-mpg car is here, and it was built by students
https://autoweek.com/article/car-new...ciency-detroit

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We loved the streamlined look of the Elroy, a gasoline-powered urban concept from team Mater Dei Supermileage from Mater Dei High School, Evansville, Ind. Photo by Shell Eco-marathon
https://www.autoblog.com/photos/shel...#slide-2589106



https://www.facebook.com/11526186189...3053565446641/
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Old 11-17-2018, 07:37 PM   #2887 (permalink)
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There's a you tube video on that. Its very loud with the megaphone exhaust...


Quote:
Originally Posted by samwichse View Post
Sort of in the realm of aerodynamics...

Tatra made a V8 T603 race car, and removed the parasitic load of the cooling fans from the air-cooled engine.

How did they keep it cool, you might ask?

Those big honking exhaust pipes are actually exhaust extractors, basically venturis that act something like the "air multiplier" on those Dyson bladeless desk fans to suck air though the engine. Voila, an extra chunk of HP not used by the cooling system!

https://www.carthrottle.com/post/wybmg98/

I always wondered if someone could run something similar on a air-cooled VW engine.
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Old 11-18-2018, 07:45 AM   #2888 (permalink)
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A slightly larger version of this car is where we should be headed. Tandem seating. Normal compact car track. Standard bumper height. All wheel drive hub motors. Top speed of 80mph. NO radar, cameras, or airbags.
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We are wasting resources to mandate safety and self driving to the point where every car must be 2,000 kg with a 500 kg battery and cost $40,000.
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Old 11-19-2018, 01:26 PM   #2889 (permalink)
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Quote:
Originally Posted by sendler View Post
A slightly larger version of this car is where we should be headed...............
I admire this design in that it somewhat relieves overhang anxiety.

That is to say, it is very difficult to package humans, drive systems and aerodynamics all into one.

One of the reasons is that either the wheelbase becomes super long or the front and rear overhangs do. And sometimes both at the same time.

This tiny car negates some of those factors by completely enclosing the front and rear wheels, so the overhang isn't as noticeable and in your face.

It still comes off looking somewhat like a float in a parade, but it's a nice parade on the study of aerodynamics.
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Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html
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Old 11-19-2018, 01:38 PM   #2890 (permalink)
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it's a very nice Jaray interpretation.

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