Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - GM AERO 2002 Cd 0.14-0.265 ( aka CITATION IV )

aerohead · 08-07-2010, 02:37 PM

NachtRitter's eyesight is superior to mine,and when he surmised that the Citation IV and Aero 2002 were distinctly different vehicles,he was spot on.
I took his 'Epcot' image ( in front of the lake ),photo-enlarged it and placed it under the 'Template' for a comparison to Citation IV.
I normalized the two cars to body height at the point of roofline max. camber point,as per the 'Template',and all dimensions were created as a function of the Citation's body height of 47.5-inches ( 1187.5 mm ).Here's what showed up:

* Wheelbase was extended 95mm.
* Front axle was moved rearward 79mm.
* Nose was extended forward 174mm.
* Windshield was raked back an additional 2-degrees.
* Backlight was steepened one additional degree.
* Rear axle was re-located rearward 182.25mm.
* Tail truncation point was extended rearward an additional 158.25mm.
* Fore-body constitutes 51.1% body length vs 49.45%.
* Aft-body constitutes 48.9% body length vs 50.55%.
* L/H= 3.886:1 vs 3.854:1.
* L/D= 1.943:1 vs 1.927:1.
* 'Template' prediction for drag coefficient= Cd 0.1575,with minor tire streamlining vs Cd 0.14 ( published ).
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The Aero 2002 has:
* hidden wipers
* hood/bonnet air extractor grille
* side mirror delete
* front wheel skirts
* skinny tires
* belly pan ( presumed )
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NOTE: The 2002 may also possess active suspension as the Aero 2000,and a Buick concept of same vintage, which lowered the nose 25mm,and raised the tail 75mm for highway speed travel.
If the Ford Probe-V 'counts' were rounded up,the the Aero 2002 would 'match' the Cd of the Probe-V.
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Other cars which share,or are close to the 2002's aft-body :
* Schlor Car Cd 0.186
* Kamm K-form model Cd 0.24
* Kamm J-form model Cd 0.26
* DeSoto Airflow experimental Cd 0.238
* AeroCivic Cd 0.17
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I searched the web for info on the 2002 and came up empty.If any members or lurkers have any data for this car it would be most welcome,thanks!

08-07-2010, 02:37 PM	#9 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 16,279 Thanks: 24,401 Thanked 7,368 Times in 4,767 Posts	Aero 2002 data update ( with un-glued eyes ) NachtRitter's eyesight is superior to mine,and when he surmised that the Citation IV and Aero 2002 were distinctly different vehicles,he was spot on. I took his 'Epcot' image ( in front of the lake ),photo-enlarged it and placed it under the 'Template' for a comparison to Citation IV. I normalized the two cars to body height at the point of roofline max. camber point,as per the 'Template',and all dimensions were created as a function of the Citation's body height of 47.5-inches ( 1187.5 mm ).Here's what showed up: * Wheelbase was extended 95mm. * Front axle was moved rearward 79mm. * Nose was extended forward 174mm. * Windshield was raked back an additional 2-degrees. * Backlight was steepened one additional degree. * Rear axle was re-located rearward 182.25mm. * Tail truncation point was extended rearward an additional 158.25mm. * Fore-body constitutes 51.1% body length vs 49.45%. * Aft-body constitutes 48.9% body length vs 50.55%. * L/H= 3.886:1 vs 3.854:1. * L/D= 1.943:1 vs 1.927:1. * 'Template' prediction for drag coefficient= Cd 0.1575,with minor tire streamlining vs Cd 0.14 ( published ). -------------------------------------------------------------------------- The Aero 2002 has: * hidden wipers * hood/bonnet air extractor grille * side mirror delete * front wheel skirts * skinny tires * belly pan ( presumed ) -------------------------------------------------------------------------- NOTE: The 2002 may also possess active suspension as the Aero 2000,and a Buick concept of same vintage, which lowered the nose 25mm,and raised the tail 75mm for highway speed travel. If the Ford Probe-V 'counts' were rounded up,the the Aero 2002 would 'match' the Cd of the Probe-V. -------------------------------------------------------------------------- Other cars which share,or are close to the 2002's aft-body : * Schlor Car Cd 0.186 * Kamm K-form model Cd 0.24 * Kamm J-form model Cd 0.26 * DeSoto Airflow experimental Cd 0.238 * AeroCivic Cd 0.17 -------------------------------------------------------------------------- I searched the web for info on the 2002 and came up empty.If any members or lurkers have any data for this car it would be most welcome,thanks!