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1. Aero Testing (score: 1): Author: "John Beckett" <landspeedracer@msn.com>; Date: Sat, 25 Jan 2003 19:52:15 -0500; OK here is another idea for testing your vehicle aerodynamics. What about a coast down test? I know little about this so my questions for you aero guys are: What useful data can be obtained from this; /html/land-speed/2003-01/msg00959.html (7,816 bytes)
2. Re: Aero Testing (score: 1): Author: Dave Dahlgren <ddahlgren@snet.net>; Date: Sun, 26 Jan 2003 06:52:33 -0500; wheel speed and time.. less than 1/4 mile. anyone with minimal data acq should be able to get this info. end of run cut engine and clutch car of put it in neutral and coast. delta V and delta T and y; /html/land-speed/2003-01/msg00965.html (8,474 bytes)
3. Re: Aero Testing (score: 1): Author: "Keith Turk" <kturk@ala.net>; Date: Sun, 26 Jan 2003 06:38:27 -0600; Yeah.... John just a listen to the boy.... first he want's a data acq.... and NOW ( the nerve of it all ) he want's a FULL pass.... Keith ( what's the world coming too....) -- Original Message -- Fro; /html/land-speed/2003-01/msg00966.html (9,220 bytes)
4. Re: Aero Testing (score: 1): Author: Twin Jugs Cycle <twinjugsharley@yahoo.com>; Date: Sun, 26 Jan 2003 07:24:05 -0800 (PST); I like that idea John, this would give a CD(coefficient of drag)# "referenced by time" rather then just Aero-drag right? If coasting speed(neutral) could be put at a constant going in(an even 100mph; /html/land-speed/2003-01/msg00969.html (9,247 bytes)
5. Re: Aero Testing (score: 1): Author: "DrMayf" <drmayf@teknett.com>; Date: Sun, 26 Jan 2003 07:34:25 -0800; Go see my web site. I think there is a coastdown method there. What you get is an overall drag coefficient. Need stop watch and just some reasonably flat track. Accel to maybe a 100 then coast down t; /html/land-speed/2003-01/msg00970.html (8,942 bytes)
6. Re: Aero Testing (score: 1): Author: Ed Van Scoy <ed@vetteracing.com>; Date: Sun, 26 Jan 2003 10:33:51 -0700; Somehow I knew that "jab" would wake Keith up. data acq.... minimal data acq car of put it the ultimate and nothing /// unsubscribe/change address requests to majordomo@autox.team.net or try /// http; /html/land-speed/2003-01/msg00982.html (9,283 bytes)
7. Re: Aero Testing (score: 1): Author: Bryan Savage <basavage@earthlink.net>; Date: Sun, 26 Jan 2003 09:42:43 -0800; Give him what he want's Keith. This year make your first pass on the short course! Bryan /// unsubscribe/change address requests to majordomo@autox.team.net or try /// http://www.team.net/mailman/lis; /html/land-speed/2003-01/msg00985.html (8,478 bytes)
8. Re: Aero Testing (score: 1): Author: "John Beckett" <landspeedracer@msn.com>; Date: Sun, 26 Jan 2003 11:48:55 -0500; OK, I do vaguely remember we beat it around some, but did we determine if it was a good idea or a bad one? John get about get /// unsubscribe/change address requests to majordomo@autox.team.net or tr; /html/land-speed/2003-01/msg01012.html (9,626 bytes)
9. Re: Aero Testing (score: 1): Author: "DrMayf" <drmayf@teknett.com>; Date: Sun, 26 Jan 2003 18:10:29 -0800; John, any knowledge gained about your car is valuable. This would provide a basis to evalyate changes against that baseline. mayf -- Original Message -- From: "John Beckett" <landspeedracer@msn.com>; /html/land-speed/2003-01/msg01016.html (8,808 bytes)
10. Re: Aero Testing (score: 1): Author: Twin Jugs Cycle <twinjugsharley@yahoo.com>; Date: Sun, 26 Jan 2003 18:43:49 -0800 (PST); Well, that "qualified" thing just counted me out. Are you saying that Flipper only likes you for your car? I think that's a great idea John(i know i've already disqualified myself to be talking about; /html/land-speed/2003-01/msg01022.html (10,476 bytes)
11. RE: Aero Testing (score: 1): Author: "Russel Mack" <rtmack@concentric.net>; Date: Sun, 26 Jan 2003 21:02:47 -0600; Guys, Dave D. can probaly tell us how to do this with a datalogger, so you don't need any external timing lights or clock-- just yank the clutch and punch your "coast-down button", and the datalogger; /html/land-speed/2003-01/msg01025.html (11,065 bytes)
12. RE: Aero Testing (score: 1): Author: "rgribble" <rgribble@carolina.rr.com>; Date: Sun, 26 Jan 2003 22:14:31 -0500; Yes, my Autometer Tach has a downloadable port that tells driveshaft RPM (equitable to MPH) vs. time. Pretty simple. Grib "Do what others Won't and you'll do what others Can't for the rest of your li; /html/land-speed/2003-01/msg01026.html (9,274 bytes)
13. Re: Aero Testing (score: 1): Author: Dave Dahlgren <ddahlgren@snet.net>; Date: Mon, 27 Jan 2003 05:36:24 -0500; you have everything you need then... a full pass at full speeds with a coastdown of 20 or 30 mph less than peak speed ought to be plenty.. the problem with the tach though is it needs to be power off; /html/land-speed/2003-01/msg01043.html (9,185 bytes)
14. Re: Aero Testing (score: 1): Author: "John Beckett" <landspeedracer@msn.com>; Date: Mon, 27 Jan 2003 21:36:50 -0500; OK here's another thought to factor in to the coast down. How big a factor is the drag from the brakes, drive line and rolling resistance. Guess it would only be important if comparing coast down Cd; /html/land-speed/2003-01/msg01058.html (9,664 bytes)
15. Re: Aero Testing (score: 1): Author: Twin Jugs Cycle <twinjugsharley@yahoo.com>; Date: Mon, 27 Jan 2003 18:44:20 -0800 (PST); I think that response was to me John, and I believe Dale is correct as are you. Now that I reread my statement I said Coefficient of Drag is what we would be measuring which is incorrect since it's; /html/land-speed/2003-01/msg01059.html (9,561 bytes)
16. Re: Aero Testing (score: 1): Author: "John Beckett" <landspeedracer@msn.com>; Date: Mon, 27 Jan 2003 21:55:37 -0500; I believe Mayf's formula does take into account the air density. yes I have the formula and it takes five pages to explain how it works. JB /// unsubscribe/change address requests to majordomo@autox.; /html/land-speed/2003-01/msg01060.html (10,391 bytes)
17. Re: Aero Testing (score: 1): Author: "Michael Puig" <puig@artshot.net>; Date: Tue, 28 Jan 2003 01:24:42 -0600; years and years ago when I was young and foolish I managed to worm my way on the phones to a NASA aero engineer to see how I could make my VW bus more aerodynamic. Yes it is true. God knows what i wa; /html/land-speed/2003-01/msg01064.html (8,974 bytes)
18. Re: Aero Testing (score: 1): Author: "John Beckett" <landspeedracer@msn.com>; Date: Sun, 26 Jan 2003 11:51:45 -0500; I opened this can of worms on purpose. Hoping to get some better qualified people than me to respond with ideas and suggestions. Perhaps this is the most realistic way for any of us to get some REAL; /html/land-speed/2003-01/msg01066.html (9,239 bytes)
19. Re: Aero Testing (score: 1): Author: Dave Dahlgren <ddahlgren@snet.net>; Date: Tue, 28 Jan 2003 05:30:05 -0500; It depends on how bad they drag.. But you are looking for the total drag for the whole car.. If you fix any of the other things then the results should show up as well.. What you do not know is the r; /html/land-speed/2003-01/msg01078.html (9,027 bytes)
20. Aero Testing (score: 1): Author: Malcolm Pittwood <MPittwood@compuserve.com>; Date: Tue, 28 Jan 2003 04:57:55 -0500; List and JB For rapid testing numbers you perhaps need one of those 'black box' systems such as Racelogic or Datron make. Magazines use them for acceleration and other forms of testing, swapping quic; /html/land-speed/2003-01/msg01080.html (9,514 bytes)

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