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Old 02-05-2024, 11:59 AM   #4201 (permalink)
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some 'Hammerhaed' noodling

If I start with a Cd 0.10 solar race car, like the 1993 HONDA Dream, and then begin to discount it's streamlining, item -by-item, without finishing, I'm up to Cd 0.335, for:
*lack of body sides camber
*lack of roof camber
*lack of all upper-body edge radii
*probable diffuser flow separation
a 235-count penalty.
I've got a few more things to consider.
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In 1993, the #34 WSC finisher, 'Mainichi-Go', had Cd 0.32.
#37 finisher,' Discovery 500' was Cd 0.45.
Both cars look remarkably more 'streamlined than 'Hammerhead.'
--------------------------------------------------------------------------------------
Perhaps by Thursday, I'll be able to wrap up my 'guestimation'.

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Old 02-06-2024, 01:53 PM   #4202 (permalink)
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Jocko Johnson's streamliners came between porting heads and his wooden sculptures.



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Old 02-07-2024, 02:23 PM   #4203 (permalink)
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Don Garlits' Wynns-liner was originally the Moonliner.

Want more? The Making of Craft of Speed (Mooneyes Documentary)
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Old 02-08-2024, 11:39 AM   #4204 (permalink)
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' aero NHRA dragsters'

Quote:
Originally Posted by freebeard View Post
Jocko Johnson's streamliners came between porting heads and his wooden sculptures.



Years ago, I searched online, and never found any aero test data for either car, from folks who were personally involved with them.
As far as I know, the, circa 1987, Arrivett Brothers, NHRA Double-A Fuel Streamliner is the only dragster to undergo actual wind tunnel tests.
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Old 02-08-2024, 11:54 AM   #4205 (permalink)
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'Hammerhead' solar racer parting remarks'

I've done about as much damage as I can on 'Hammerhead.'
* Factoring in the 'upright' windshield, the drag climbed to Cd 0.3766.
* Factoring in the 'catamaran' type wheel fairings, they brought the Cd up 0.4192.
* The photovoltaic 'canards' on either side of the cabin will degrade Cd a bit more, but without actual exterior dimensions, it's folly to attribute any quanta to them, other than an estimated Cd 0.83, based upon their frontal area, plus an interference 'excrescence' penalty.
--------------------------------------------------------------------------------------
These numbers are just a 'shootin' from the hip' estimate.
I found test examples from 14-sources which isolated single attributes to specific 'features' drag, empirically tested in the past, and converted their observed 'counts' penalty, to a percentage Cd degradation.
--------------------------------------------------------------------------------------
I 'like' ALL solar race cars, and I'm glad for the entire student body and teaching staff involved in the ' Hammerhead' project.
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Old 02-08-2024, 02:08 PM   #4206 (permalink)
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Top-chopped ice cream truck


justacarguy.blogspot.com: Yosemite Park and Curry Company delivery truck in a Yosemite Valley campground in August 1937

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