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Author Topic: GEARSPLIT program under Win XP  (Read 19379 times)
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desotoman
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« Reply #15 on: February 06, 2005, 01:34:00 PM »

Dave, if you made a coastdown program I know I would use it for my cars. Thanks, Tom Gerardi
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Asking questions is one's only way of getting answers. As a young boy I was always taught that there is no such thing as a stupid question. It suggests that the quest for knowledge includes failure, and that just because one person may know less than others they should not be afraid to ask rather than pretend they already know. In many cases multiple people may not know but are too afraid to ask the "stupid question"; the one who asks the question may in fact be doing a service to those around them.
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« Reply #16 on: February 06, 2005, 06:06:00 PM »

Dave, the new program would be very welcome.  And if this, as well as the original Gearsplit program, were able to also run on a mac platform this would be fantastic. I know this is asking alot.
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ddahlgren
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« Reply #17 on: February 06, 2005, 06:23:00 PM »

I have no plans to do anything for a MAC platform if there is a windoze emulator for the MAC that would be your best bet. For right now that is my stand in the future if any complilers and linkers come out that will do both windoze and MAC it might change but until then i see little hope for any MAC stuff.
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« Reply #18 on: February 07, 2005, 12:45:00 AM »

Keith - If you are interested these are the coast down formulas . Speeds are in Ft/Sec (mph x 1.47)
 
 If you're timing the seconds to coast from speed (A) to speed (B):
   (A) minus (B) divided by coast down seconds divided by 32 x car wt. = drag in Lb.
 
 If you're seeing how much speed you loose while coasting for a given distance:
   
   Speed lost x 2 divided by coast down Ft x car wt. = drag in Lb.
 
  Lb drag includes aero and rolling friction and is for the average speed . The greater the change in speed the more the drag curve affects the accuracy . The accuracy is as good as the speedometer and the observers eye & thumb .
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« Reply #19 on: May 26, 2005, 04:26:00 PM »

aero and rolling have to be separated to get any meaningful answer.
 Dave
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deadbolt
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« Reply #20 on: January 29, 2006, 04:15:05 PM »

This GearSplit sounds very interesting, where would I find a copy of it?
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landracing
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« Reply #21 on: January 29, 2006, 05:17:17 PM »

http://www.landracing.com/miva/merchant.mv?Screen=PROD&Store_Code=L&Product_Code=GSLP&Category_Code=OSM
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Rex Schimmer
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« Reply #22 on: January 30, 2006, 11:44:06 AM »

Headshot, I read were you think that the Cd on you Dodge pickup to be around .5. NOT EVEN CLOSE! Your truck is not a brick, it's two bricks! A short one setting on top of a long one. The Cd for the bottom may be some place below 1.0 because of its length but the cab, being so short probably has a Cd above 1 and combined  you have a brick! It is not the shape of the front of the car it is the shape of the back that counts most.

Paul Van Valkenburgh has a good discription of finding the Cd via the cost down method in his book "Race Car Engineering and Mechnics".

Rex
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Sumner
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« Reply #23 on: January 30, 2006, 01:29:57 PM »

Quote from: Rex Schimmer
Headshot, I read were you think that the Cd on you Dodge pickup to be around .5. NOT EVEN CLOSE! Your truck is not a brick, it's two bricks! A short one setting on top of a long one. The Cd for the bottom may be some place below 1.0 because of its length but the cab, being so short probably has a Cd above 1 and combined  you have a brick! It is not the shape of the front of the car it is the shape of the back that counts most.

Paul Van Valkenburgh has a good discription of finding the Cd via the cost down method in his book "Race Car Engineering and Mechnics".

Rex


Saw a recent Myth Busters where they drove two identical pickups down the highway until they ran dry with one following the other.  It was a long ways on a full tank, over 300 miles if I remember right.

Anyway the test was to see if the tailgate was down if you got better mileage.  Well the one with the tailgate up went quite a bit further.  

They said, I don't know if it is true or not, that the newer pickups are designed so that with the tailgate up it makes a bubble of air circulate back forward to the cab and up the back of the cab which then tumbles in a circular motion that stops the air going over the top of the cab from getting sucked in behind the cab thus streamlining the air flow (Some of the F1 cars use diverted air to help with the airflow around the open wheels and I've considered experiment with that later on my lakester if it ever actually runs.).  

Hope you understand what I was trying to explain rolleyes .  I think they even put Styrofoam balls or something in the back to see how the air really was circulating and it followed the above statement.

Disclaimer:  All of the above could be true or a myth since I saw the show a couple weeks ago and at least 1/2 of those memory cells are no longer with me cry .

c ya, Sum
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« Reply #24 on: May 25, 2011, 09:33:21 AM »

You can run XP programs virtual in WIN7! There is a demo at the link on the jpg!  cheers


* WIN7XP01.JPG (83.57 KB, 1059x667 - viewed 328 times.)
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WOODY@DDLLC
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« Reply #25 on: May 25, 2011, 10:01:35 AM »

Does this mean that this CFD Subaru might actually work!?! OMG?!?  shocked

http://www.symscape.com/blog/tailgate-up-or-down

http://www.stanford.edu/group/uq/pdfs/conferences/SAE-2005-419.pdf
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All models are wrong, but some are useful! G.E. Box (1967) www.designdreams.biz
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