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Old 06-23-2012, 04:33 PM   #1 (permalink)
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Another Candy Store

I just finished the 72-page 'Technical Report Sunrayce 95' which I found online.
It covers solar racers with Cds from 0.32,to 0.08 and everything in between.
Most interesting to me was Northern Essex Community College' 3-wheeled "TNE" which ran on battery power alone for the whole race,PV array folded and stored within the vehicle.
The TNE had Cd 0.10, frontal area of 0.7m(7.5 sq ft),and GVW of 344 kg (757 lbs)
TNE ran the whole race at posted speed limits of 55-65 mph when solar charging permitted it.
From data provided,at 55 mph,and 92% mechanical efficient drivetrain,2.887 bhp would be sufficient to balance it's road load.
At a BSFC of 0.40 lb/bhp-hr (Chevy old school V8) TNE would return 285 mpg at a constant 55 mph.
With a VW/AUDI Diesel TDI powerplant the TNE would see 350 mpg.
The car was described as a 'torpedo' with 3.8m (12.5') Length,1.0m(3.3') height,and faired but exposed front wheels 1.35m (4.4') tip to tip.Ground clearance is 0.5'(152mm).
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When Sunraycer bowed back in 1987,Dr.Paul MacCready reported that,on gasoline,a 'car' like this would attain 400 mpg.I get it!
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Anyway,it's fun reading,and allows another glimpse into the world of low-drag vehicles.
Scale 'em up to 'regular' size,put some 'real' wheels and tires on 'em,and they're still pretty light on consumption.Tasty!
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Here is an attempt at the link to the report
http://www.osti.gov/bridge/servlets/...ble/376410.pdf


Last edited by aerohead; 06-28-2012 at 05:38 PM.. Reason: add web address for report
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Old 06-24-2012, 06:01 AM   #2 (permalink)
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Sounds like a good read and great find, Phil. Amazon books shows it out of print.
Amazon.com: Technical report: Sunrayce 95: Richard King: Books
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Old 06-27-2012, 05:08 PM   #3 (permalink)
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out of print

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Originally Posted by KamperBob View Post
Sounds like a good read and great find, Phil. Amazon books shows it out of print.
Amazon.com: Technical report: Sunrayce 95: Richard King: Books
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Al found it online and printed it out for me.The image quality isn't great but all the text is pristine.
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Old 06-27-2012, 10:41 PM   #4 (permalink)
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Quote:
Originally Posted by aerohead View Post
Northern Essex Community College' 3-wheeled "TNE"
Did it look anything like this?

Team New England
Team New England - Wikipedia, the free encyclopedia

Quote:
TNE-II in Australian Outback
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Old 06-28-2012, 07:38 AM   #5 (permalink)
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Quote:
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Al found it online and printed it out for me.The image quality isn't great but all the text is pristine.
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Phil, if you can get the web addy it can be added to the Virtual Library.
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Old 06-28-2012, 04:58 PM   #6 (permalink)
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this?

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Did it look anything like this?

Team New England
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best I can tell,this is the car.It's the same number as raced in 1995,and at the University's website they show a smaller photo as you've posted.
Had they had sunshine on two of the clouded-over days they would have clobbered the competition.
The TNE's 'classic' streamlining registered less than half the drag as that of a modified
Morelli form which also raced.
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Old 06-28-2012, 05:01 PM   #7 (permalink)
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Phil, if you can get the web addy it can be added to the Virtual Library.
Al's workin',but I'll see if I can get him to figure out where he acquired the report.
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Old 06-28-2012, 05:41 PM   #8 (permalink)
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address for report

we found the site and Al helped me drag it over.You'll find it up at #1 Permalink above.Bon Appetit!
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Old 06-29-2012, 08:50 AM   #9 (permalink)
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Old 07-03-2012, 11:03 AM   #10 (permalink)
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Here I thought the practical ceiling on road cars was about 100mpg. My upcoming project aims at 80mpg, but 350 would be amazing. You could literally drive from Maine to California on a single 10-gal tank.

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