[DeTomaso] New engine

Mon Dec 8 22:31:11 EST 2014

I thought about NACA ducts and did a little reading.  They seem to be out of favor except for very special applications.  One article said they need to be at a bit of an angle to the air flow to work well, and on some applications they saw air flowing out instead of in.  The do make some sense under a car because a scoop probably won't survive too long.
I thought about shaping the bottom, but we would be trying to create higher pressure by slowing the air flow at the rear of the NACA duct, and that is the opposite of a ground effects car where the taper is wide to narrow to accelerate the air flow to create low pressure to hold the car down.  
Maybe someone could collect all the data from things people have tried to at least have a starting point?  Both Jr Wilson and Goran have very shallow scoops on the car roof.  I assume they worked?  I read that the boundary layer grows thicker with surface length.  Since the roof is a lot shorter than the sides, maybe the boundary layer is thin there?  I suppose you could semi hide a roof scoop if it is buried in the roof vs extending from the roof?  I think I saw that on one very modified car at Byers shop 2 or 3 years ago?
Has anyone asked Tom Tjaarda if he has any air intake ideas that done spoil his beautiful design?
Ken
       From: Boyd Casey <boyd411 at gmail.com>
 To: 576103 <MikeLDrew at aol.com> 
Cc: Robert Stroj <npdrs at maui.net>; richard bosch <theemonkey at yahoo.com>; "detomaso at poca.com" <detomaso at poca.com> 
 Sent: Monday, December 8, 2014 3:58 PM
 Subject: Re: [DeTomaso] New engine

  There you go! If that's were the original designers felt the air for
  the intake should come from it's good enough for me!
  This NACA duct available from summit for a mere $14.95 at the end of a
  ductA  (or two ducts if you used the spectre air box / air filter with
  two intakes could have one NACA duct mounted at the end of each
  "snorkel" duct mounted parallel to the ground right at the bottom of
  the fire wall. The NACA ducts draw in air without the need to create
  any drag. NACA is the predecessor to NASA and you can recognize the
  NACA ducts from numerous early jets and many sports cars (particularly
  Ferrari's (like F-40's) a NACA duct placed parallel to the air flow
  will draw in air with out creating any drag.[1]NACA duct
  Boyd

  On Mon, Dec 8, 2014 at 5:55 PM, <[2]MikeLDrew at aol.com> wrote:

    In a message dated 12/8/14 10 00 35, [3]boyd411 at gmail.com writes:
    I would ask Mike drew about the original
    design of the "snorkel" intake.
    >>>Hah!A  Don't ask me--instead, just look at the picture, which is,
    in this case, worth well more than a thousand words from me!
    [4]http://www.panterasbywilkinson.com/webpages/catalog/ill14d.html
    Mike

References

  1. http://www.summitracing.com/parts/kys-100-49004?seid=srese1&gclid=Cj0KEQiAtZWkBRC9ibSfhoKEyLYBEiQA5fDxkUAK29X27RKNyE4FhlpHNBZvHCwsLsQIbaX9aLT__FsaAvpK8P8HAQ
  2. mailto:MikeLDrew at aol.com
  3. mailto:boyd411 at gmail.com

  4. http://www.panterasbywilkinson.com/webpages/catalog/ill14d.html

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-------------- next part --------------
   I thought about NACA ducts and did a little reading.  They seem to be
   out of favor except for very special applications.  One article said
   they need to be at a bit of an angle to the air flow to work well, and
   on some applications they saw air flowing out instead of in.  The do
   make some sense under a car because a scoop probably won't survive too
   long.
   I thought about shaping the bottom, but we would be trying to create
   higher pressure by slowing the air flow at the rear of the NACA duct,
   and that is the opposite of a ground effects car where the taper is
   wide to narrow to accelerate the air flow to create low pressure to
   hold the car down.
   Maybe someone could collect all the data from things people have tried
   to at least have a starting point?  Both Jr Wilson and Goran have very
   shallow scoops on the car roof.  I assume they worked?  I read that the
   boundary layer grows thicker with surface length.  Since the roof is a
   lot shorter than the sides, maybe the boundary layer is thin there?  I
   suppose you could semi hide a roof scoop if it is buried in the roof vs
   extending from the roof?  I think I saw that on one very modified car
   at Byers shop 2 or 3 years ago?
   Has anyone asked Tom Tjaarda if he has any air intake ideas that done
   spoil his beautiful design?
   Ken
     __________________________________________________________________

   From: Boyd Casey <boyd411 at gmail.com>
   To: 576103 <MikeLDrew at aol.com>
   Cc: Robert Stroj <npdrs at maui.net>; richard bosch
   <theemonkey at yahoo.com>; "detomaso at poca.com" <detomaso at poca.com>
   Sent: Monday, December 8, 2014 3:58 PM
   Subject: Re: [DeTomaso] New engine
     There you go! If that's were the original designers felt the air for
     the intake should come from it's good enough for me!
     This NACA duct available from summit for a mere $14.95 at the end of
   a
     ductA  (or two ducts if you used the spectre air box / air filter
   with
     two intakes could have one NACA duct mounted at the end of each
     "snorkel" duct mounted parallel to the ground right at the bottom of
     the fire wall. The NACA ducts draw in air without the need to create
     any drag. NACA is the predecessor to NASA and you can recognize the
     NACA ducts from numerous early jets and many sports cars
   (particularly
     Ferrari's (like F-40's) a NACA duct placed parallel to the air flow
     will draw in air with out creating any drag.[1]NACA duct
     Boyd
     On Mon, Dec 8, 2014 at 5:55 PM, <[2][1]MikeLDrew at aol.com> wrote:
       In a message dated 12/8/14 10 00 35, [3][2]boyd411 at gmail.com
   writes:
       I would ask Mike drew about the original
       design of the "snorkel" intake.
       >>>Hah!A  Don't ask me--instead, just look at the picture, which
   is,
       in this case, worth well more than a thousand words from me!

   [4][3]http://www.panterasbywilkinson.com/webpages/catalog/ill14d.html
       Mike
   References
     1.
   [4]http://www.summitracing.com/parts/kys-100-49004?seid=srese1&gclid=Cj
   0KEQiAtZWkBRC9ibSfhoKEyLYBEiQA5fDxkUAK29X27RKNyE4FhlpHNBZvHCwsLsQIbaX9a
   LT__FsaAvpK8P8HAQ
     2. mailto:[5]MikeLDrew at aol.com
     3. mailto:[6]boyd411 at gmail.com
     4. [7]http://www.panterasbywilkinson.com/webpages/catalog/ill14d.html
   _______________________________________________
   Detomaso Forum Managed by POCA
   DeTomaso mailing list
   [8]DeTomaso at poca.com
   [9]http://poca.com/mailman/listinfo/detomaso_poca.com

References

   1. mailto:MikeLDrew at aol.com
   2. mailto:boyd411 at gmail.com
   3. http://www.panterasbywilkinson.com/webpages/catalog/ill14d.html
   4. http://www.summitracing.com/parts/kys-100-49004?seid=srese1&gclid=Cj0KEQiAtZWkBRC9ibSfhoKEyLYBEiQA5fDxkUAK29X27RKNyE4FhlpHNBZvHCwsLsQIbaX9aLT__FsaAvpK8P8HAQ
   5. mailto:MikeLDrew at aol.com
   6. mailto:boyd411 at gmail.com
   7. http://www.panterasbywilkinson.com/webpages/catalog/ill14d.html
   8. mailto:DeTomaso at poca.com
   9. http://poca.com/mailman/listinfo/detomaso_poca.com