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Old 10-02-2017, 02:20 PM   #311 (permalink)
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Quote:
...the difference in length...
I went to A 0.12 Cd Auto Body model You Tube video and scaled it off my screen.

At this location at this time a slightly fore-shortened view measures 7" overall and 5 3/4" to the separation. Now all you need in the overall length.

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Old 10-03-2017, 07:24 AM   #312 (permalink)
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Fantastic work on the model! And the sucessful trip to the wind tunnel.
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Old 10-03-2017, 12:43 PM   #313 (permalink)
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How is the brother doing?
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Old 10-07-2017, 02:13 PM   #314 (permalink)
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doing

Quote:
Originally Posted by Xist View Post
How is the brother doing?
The constant pain persists.Opioids offer maybe 4-hours of sleep,tops.
No strength in the arm,skin feels like foam rubber,he can't write.Can't find any position which is pain-free.
He's trying to be optimistic.And we'll see if physical therapy does anything.
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Old 10-13-2017, 06:16 PM   #315 (permalink)
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Just A Car Guy: 10 made, 2 survive, and this one was the prototype




It appears the dorsal rib is a boat-building thing. Somebody should do this to a VW Beetle.
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Old 10-14-2017, 02:25 PM   #316 (permalink)
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Baby template car specifications

Here are the as-tested measurements for 'baby':
*Scale-approx. 36.68%
*Model weight-168-pounds (all three components)
*Length-97.5"
*Height-24.64"
*Body height-20.28"
*Width-28.375"
*Ground clearance-4.3"
*Front track-24.625"
*Rear track-18.25"
*L/H=3.957
*L/h=4.807
*L/W=3.436
*Diffuser-2.8-degrees
*Forebody-23.302"
*Aft-body-74.198" (long-tail)
*Aft-body-44.948" (short-tail)
*Stinger-29.25"

*Tire width-64mm
*Wheel fairings width-88mm
*Frontal projected area-3.4795 sq-feet
*Coefficient of Aerodynamic Drag (long-tail)-0.12099 (ave. 3-runs @ zero-yaw)
*Coefficient of Aerodynamic Drag (short-tail)-0.148 (ave. 2-runs @ zero-yaw)
*Drag index (CdA)-0.4209 sq-feet (long-tail)
*Drag index (CdA)-0.5149 sq-feet (short-tail)
*Reynolds number,approx.-1,634,402 at 76 mph airspeed
*Reynolds number,approx.-645,157 at 30 mph airspeed (smoke-flow imaging)
Comments:
*Wheel fairings could be narrower @ 1:1 scale
*Stinger was intentionally mutilated in order to provide for DOT taillights and license plate
*No facility for crosswind-averaged,SAE J1252/ J 2071,test protocol
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Last edited by aerohead; 10-14-2017 at 04:06 PM.. Reason: add data
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Old 10-14-2017, 03:39 PM   #317 (permalink)
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Quote:
Just the 1.5-inch pipe insulation taped to the front of 'baby',to soften the lower leading edge created 103-lbs of downforce,@ 200-mph.
http://ecomodder.com/forum/showthread.php/great-success-airdam-98-odyssey-35498-4.html#post552402

I don't remember this part.
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Old 10-14-2017, 03:56 PM   #318 (permalink)
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this part

Quote:
Originally Posted by freebeard View Post
Layne printed out all of the EXCEL spreadsheets for all the runs.For Baby's 3-runs,overall lift was: 114-lbs,93-lbs,and 104-lbs,for an average of 103.6 lbs.
We're not 100% confident about the values,as the ground board adds some room for interpretation with respect to lift.
Layne did make special mention,that most of the airdams he's experienced,produce unwanted induced drag.
If I'd softened the lower leading edge of 'Baby' I wouldn't have needed to add the rounded 'splitter',however,by doing so,provided the softening,plus a 'bumper' the the DOT might be interested in.
With enough money,I suspect that it would be a straight forward process to tune the nose for zero-lift/downforce.
At 70-mph,the splitter would induce only 12.25-lbs of negative lift.Meaningless in the grand scheme of things.
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Old 10-15-2017, 12:13 AM   #319 (permalink)
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I meant I don't remember a run with that modification.

Buckminster Fuller had a feature that didn't make it to his Dymaxion prototypes. He called it an 'air keel'.



You could view it as sponsons or spats for the wheels and a 'cleft chin' converging duct in the soft-rounded nose to provide a central jet of energized air. The nose looks more bluff, too; more like Baby than the prototypes.
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Old 10-21-2017, 01:21 PM   #320 (permalink)
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that modification

I taped it on,the morning of testing.The original nose was squared off down there and would not have allowed flow attachment at all.
Cutting material away would provide an optimized radius without the induced drag of the splitter.
'Baby' was such a pain to transport,I doubt that I'll ever take it back for additional testing.
I want the bed back in the truck.

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