[DeTomaso] Fw: Possible Hood Vents

Dan Courtney dfcex at pacbell.net
Wed Jul 1 07:04:06 EDT 2009


Sounds like FUN!
Dan

Dan F. Courtney

La Jolla, CA

(858) 551-5455 Phone
(858) 551-5456 Fax
  ----- Original Message ----- 
  From: Ken Green 
  To: 'Dan Courtney' ; detomaso at realbig.com ; Göran Malmberg 
  Sent: Monday, June 29, 2009 9:06 AM
  Subject: Re: [DeTomaso] Possible Hood Vents


        I talked to guy who builds the "Ultimate Aero" which was (not sure if it still is) offically the worlds fastest production car.  He said that during testing, the rear end lift at high speed caused the the car to spin the tires at a shift around 200 MPH.  

        Ken

        --- On Mon, 6/29/09, Göran Malmberg <hemipanter at hemipanter.se> wrote:


          From: Göran Malmberg <hemipanter at hemipanter.se>
          Subject: Re: [DeTomaso] Possible Hood Vents
          To: "'Dan Courtney'" <dfcex at excaliburre.com>, detomaso at realbig.com
          Date: Monday, June 29, 2009, 5:21 AM


          Dan.

          At front I have used bellypan myself, but the car is very low
          and has stiff springs. The height makes for return distance 
          and the stiff springs for less travel. On the downside this 
          limit wheel diameter size. But I functions very well for a flat 
          only bellypan. I had the whole front A-arm over the pan.

          The rear is worse. On the side off and aft of the gearbox we 
          have the subframe that limit the possibility of a diffuser.
          The same goes for the rear A-arms that can not go much lower 
          than parallel to ground or else the diffuser expansion will be
          future limited by the frame. 

          I think you may have a point in the rear stance at high speed
          as the hood come off. Despite the fact that most people talk 
          about FRONT end lift. I could imagine some slight lift force at 
          speed and a reduction in rear end grip is felt as instability.
          But it might have have been amplified in conjuction with other 
          issues like rear toe. 
          Goran

          -----Ursprungligt meddelande-----
          Från: Dan Courtney [mailto:dfcex at pacbell.net] 
          Skickat: den 29 juni 2009 12:59
          Till: Göran Malmberg; detomaso at realbig.com
          Ämne: Re: [DeTomaso] Possible Hood Vents

          Goran,

          Pretty incredible engineering, especially the wood model.
          Would you say a bellypan cannot be incorporated with stock A-arms?

          Dan
          Dan F. Courtney

          La Jolla, CA

          (858) 551-5455 Phone
          (858) 551-5456 Fax
          ----- Original Message ----- 
          From: "Göran Malmberg" <hemipanter at hemipanter.se>
          To: "'Dan Courtney'" <dfcex at excaliburre.com>; <detomaso at realbig.com>
          Sent: Sunday, June 28, 2009 12:52 PM
          Subject: SV: [DeTomaso] Possible Hood Vents


          We have some lost hoods in Sweden to. But the hood does already have
          a big hole in it for the air to escape. I don't think more openings
          does a to big job in reducing rear lift at speed. It is more of a
          direction of vented air stream, if this for some reason is desired.

          Check out my drawings on my site www.hemipanter.se klick A-arm geometry.
          I did made a drawing of a frame layout that will permit the use of a
          functional bellypan. The front and rear lower A-arm mounts are raised
          to give room for both front and rear diffuser. My front hood air outlet
          is handling ALL radiator air. So here a bellypan is Ok. But the front
          end is pretty low to allow for some return movement of the low A-.arms
          not to hit the bellypan. This limit front tire diameter to 600mm.
          Goran

          -----Ursprungligt meddelande-----
          Från: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
          För Dan Courtney
          Skickat: den 28 juni 2009 20:38
          Till: detomaso at realbig.com
          Ämne: Re: [DeTomaso] Possible Hood Vents

          I think the bigger aero problem is air coming under the car and lifting
          the rear deck lid.
          Both myself and Mad Dawg have lost rear deck lids at high speed.
          The Beast has the vents in it's fiberglass front hood.
          I'll soon be adding a front air dam, but I still think a belly pan or
          louvers in a (fiberglass) rear deck lid are required.

          Dan
          Dan F. Courtney

          La Jolla, CA

          (858) 551-5455 Phone
          (858) 551-5456 Fax
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