Pickup truck aerodynamics
Just a quickie,based on T-100/Dodge research
*Flatbed --------------------------------------- Cd 0.668 *Suburban type roof (Lear cap)------------------ Cd 0.39 *Pickup bed (open)------------------------------Cd 0.44 *Full tonneau ---------------------------------- Cd 0.415 *GM' Half-tonneau ------------------------------Cd 0.357 *Texas Tech (GM) Aero Shell ------------------- Cd 0.352 *ITworks double-geometry shell ---------------- Cd 0.325 *Spirit of Ecomodder.com----------------------- Cd 0.268-0.267 *Spirit of Ecomodder.com with folded mirrors----- Cd 0.251 *Spirit of Ecomodder.com with mirror delete (est.) Cd 0.24 *Complete boat-tail on custom truck box--------- Cd 0.12? -------------------------------------------------------------------------- Here's a semi-recent photo of a pickup chassis (Chrysler) illustrating the 'body-on-frame' nature of most trucks.The Ridgeline,VW,Subaru Brat, Dodge Rampage,etc. would be exceptions http://i1271.photobucket.com/albums/...ad2/03-293.jpg ------------------------------------------------------------------------- Here's the all-new for 1986 GM pickup revealing the deep chassis of which the airdam or belly pan will help with,drag-wise http://i1271.photobucket.com/albums/...ad2/03-292.jpg Here is a shot of the blistered half-tonneau cover.It's the rear half of a plan-tapered aeroshell http://i1271.photobucket.com/albums/...ohead2/201.jpg Here is the blistered half-tonneau in combination with a very rudimentary cab-wing http://i1271.photobucket.com/albums/...ohead2/206.jpg Here is a shot which shows the aft-body more in true length http://i1271.photobucket.com/albums/...ohead2/601.jpg Here is a tuft study of the aft-body near home back in the day http://i1271.photobucket.com/albums/...titled-2-2.jpg |
The GM half tonneau is the rear half covered?
What are the Texas Tech Aero Shell and the ITworks double-geometry shell? How far back does the noted boat tail go? All the way to a point? Pics, or at least links! ;) |
The half tonneau by itself is that much better than a full tonneau? :confused:
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Thanks Phil. I have a shell in mind with an extension back about another foot. I could keep the tail lights exposed that way.
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This is a great thread - thanks, Phil!
Grain of salt: not all pickup trucks are the same. Differences in height, width, length, cab shape, step vs. fleet side, weight, driveline (gearing, horsepower, valves per cylinder, fuel type & delivery, aspiration, two vs. four vs. all wheel drive) vary across make, model and production year. For trucks X and Y the optimal aero-mod may not be the same solution. |
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tonneau/shell
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In 1988,Texas Tech University's Dept.of Mechanical Engineering Aero Lab published an SAE Paper on pickup truck aero.It is here that we're introduced to 'aeroshell' for the first time.In the 'photo-albums' under documents,there is an image of their drag table which depicts the aeroshell.It was good for a 20% drag reduction and 10% HWY mpg. Itworks is me (Independence Technological Works).When I do public presentations people seem to be attached to officialdom,so I created ITworks to connect with the displays. My cover simply combined the elevation contour of the Texas Tech Aeroshell with some plan taper to cheat a little extra mpg out of the device.It demonstrated a 13% HWY mpg improvement,which according to GM Aero Lab equates to a 26% drag reduction. As to the boat tail length,70% = 100% as far as the drag eduction goes,as from 70% on,truncation of this structure is duplicated aerodynamically as a 'phantom-tail.' Fachsenfeld was doing this.This is what Kamm premised his work on.Alberto Morelli did likewise with the CNR car of 1976-78. I have the GM patent and I'll try and get it scanned this Saturday.AUTOWEEK carried an article for a Gale Banks GMC LSR pickup which sported the 1/2-tonneau for it's 211-mph run at Bonneville.If it isn't in the photo-album I'll dig that out. The ITworks aeroshell should be in the photo-album as well,or you can just GOOGLE Phil Knox,for the EV World article by Jessica Savage about the T-100 from a few years back . Hope that helps!:) |
So this is the TIworks shell?
http://www.evworld.com/images/pknox_toyota.jpg I looked on the SAE's website for the papers but they are not available for free. :( |
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http://highperformancetrucks.com/gal...serialNumber=2 Here\'s the Banks Sidewinder. Notice the half tonneau. http://assets.bankspower.com/mag_inl...de4_inline.jpg The next question is, why? It would seem that this opening would impede the vortex that leads high speed air over the virtual template. |
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