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Old 04-20-2015, 11:27 AM   #1 (permalink)
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Lightbulb Solar Car Bad Aerodynamic........

I saw it in the newspaper picture SC side view

origo


better quality (view)


car info......


pattern Aerodynamic (BEST classic pattern ecomodder ? )


---------MY JOB-----------

Bad pattern line OK bad number given

I did it correctly.
Please Fix You

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Old 04-20-2015, 11:45 AM   #2 (permalink)
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The template is more of a starting place for modifications than it is a golden rule. The Honda Insight, GM EV1 and Toyota Prius don't match the template either. Add to that the quirks of building a solar car in any respect, and I'm sure they have reasons for the 'deviations'.
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Old 04-20-2015, 06:41 PM   #3 (permalink)
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solar / bad

Actually,due to the fact that solar racers are exposed to a limited exposure driving environment,they can use wing-derived bodies of very low drag,although not considered 'practical' for a daily driven automobile.
The NUON NUNA series of solar racers,in calm conditions can reach Cd 0.07 due to their large areas of laminar boundary layer,low skin friction.
Here is an example of CFD testing of such a car

A more traditional 'pumpkin seed'/ 'flattened-torpedo' HONDA Dream only achieves Cd 0.10

The Cambridge University Eco Racer (CUER) also only achieves Cd 0.10.

So,so far,the wing-type body has an advantage for overall low drag.
As to the canopy on your solar racer,I suspect that in plan-view,the air is directed around the sides,rather than over the top,and the flow would be better than imagined if only looking at the side of the car.
Here are some canopies
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Last edited by aerohead; 04-20-2015 at 06:43 PM.. Reason: remove redundant image
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Old 04-21-2015, 01:02 AM   #4 (permalink)
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Your best aerohead nicely explained
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Old 04-21-2015, 04:31 AM   #5 (permalink)
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Therefore, this template is designed for normal cars and not for solar cars. Am I right.

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Old 04-21-2015, 04:48 AM   #6 (permalink)
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The template works best for solid bodies.

A Solar car is less a body than a giant wing... necessary to give maximum area for the solar collectors.
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Old 04-21-2015, 06:45 PM   #7 (permalink)
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normal / solar

Quote:
Originally Posted by slipknotsv View Post
Therefore, this template is designed for normal cars and not for solar cars. Am I right.

The original premise was to provide an aft-body contour of high confidence,for the elongation which Hucho has promoted,and others have used for separation-free flow; to either reduce or eliminate the wake.
So yes,it is primarily intended for mass-produced automobiles manufactured after around 1984.
Derivatives of this 'pumpkin seed' actually began the modern solar racer era,with the introduction of the GM/AeroVironment Sunraycer,which won the 1987 World Solar Challenge

Which borrows from Koenig-Fachsenfeld/Kamm of the mid-1930s

Which borrowed from Walter Lay of 1933

Who borrowed from Wolfgang Klemperer of 1922

Who,in turn,borrowed from Paul Jaray the same year

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The 2013 Cambridge University Eco Racer (CUER) is a recent solar racer which closely fits the template,with Cd 0.10


Many of the university solar teams opt for laminar wing profiles as a basis for their race cars.Each layout has specific advantages.
The racers like CUER appear to be the 'fastest' of all solar cars,but rely on a stored PV array,and battery-only power while racing.If they encounter any problems while out on the course,it can spell disaster to their point standing.

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