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aircap
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« Reply #30 on: October 22, 2009, 08:34:39 PM » |
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The Mythbusters missed one important thing in their testing....
They didn't use "scale" air!
(I like Jamie & Adam, but their scientific conclusions are often bogus)
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Milwaukee Midget
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#996 I/GT
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« Reply #31 on: October 22, 2009, 08:44:32 PM » |
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Your negativity is getting you nowhere but more depressed!
So if I believe in dimples, I can stop taking Zyban? |
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Celebrating 50 years of the MGB by desperately trying to keep one roadworthy.
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desotoman
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Remember "Got'Cha" when you vote for Hall of Fame
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« Reply #32 on: October 22, 2009, 08:48:49 PM » |
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Here is a good explanation of why dimples work on golf balls. Tom G. http://www.aerospaceweb.org/question/aerodynamics/q0215.shtml |
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"Got'Cha" was first run in 1974. Bill Temple entered both 2 clubs in 1976 with records in AA/BGR. At El Mirage 201.79 and Bonneville at 220.
In 1977 Greg Temple started driving "Got'Cha" and entered the El Mirage Dirty 2 club in 1979 @ 201.97.
Bill and Greg were the first father and son to enter the El Mirage Dirty 2 club. They broke the D/BFR at Bonneville in 1981 @ 241 with top speed of 249. This record still stands today. In 1991 they set the A/BFR @ 261 which was later broke by Duane McKinney.
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Dr Goggles
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The Jarman-Stewart "Spirit of Sunshine" Bellytank
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« Reply #33 on: October 23, 2009, 12:09:15 AM » |
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If your golf ball is spinning, it's probably sailing out of bounds in a slice or hook .......whoa there. Spin is critical to stability of ANY symmetrical unpowered flying object....bullet, football, tennis ball, GOLF ball , er, bouncing bomb, frizbee , hat....the list goes on. In ball and bat games it is very difficult to hit a "still (not spinning) ball" because they jerk around in the air , they are very difficult to pitch ,impossible to acurately direct. now, where were we? oh yeah, that link above has it all explained as simply as possible.... |
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« Last Edit: October 23, 2009, 12:21:09 AM by Dr Goggles »
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pookie
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« Reply #34 on: October 23, 2009, 12:50:35 AM » |
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Who is throwing those" knuckle" golf balls" . My rather weak attempt at humor..I apologize Mike R.
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John Burk
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« Reply #35 on: October 23, 2009, 04:49:29 AM » |
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This reminds me of back in 60s when Hot Rod Magazine got Don Prudhomme to make a run with a recording accelerometer and published the results . Years later Paul Van Valkenburg who loaned HRM the accelerometer told me that the vibration splashed ink all over the paper and the readers were seeing a curve somebody drew with a fountain pen .
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desotoman
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Remember "Got'Cha" when you vote for Hall of Fame
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« Reply #36 on: October 23, 2009, 02:42:08 PM » |
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.......whoa there.
Spin is critical to stability of ANY symmetrical unpowered flying object....bullet, football, tennis ball, GOLF ball , er, bouncing bomb, frizbee , hat....the list goes on.
In ball and bat games it is very difficult to hit a "still (not spinning) ball" because they jerk around in the air , they are very difficult to pitch ,impossible to acurately direct.
now, where were we?
Did you ever think the stitching of the seams might be the reason a non spinning baseball does not go straight, yet when spun it can curve, sink etc. If spin is so critical to stability, how can I even hit anything with my BB gun that has no riffling or my slingshot using ball bearings? Tom G. |
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« Last Edit: October 23, 2009, 03:10:58 PM by desotoman »
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"Got'Cha" was first run in 1974. Bill Temple entered both 2 clubs in 1976 with records in AA/BGR. At El Mirage 201.79 and Bonneville at 220.
In 1977 Greg Temple started driving "Got'Cha" and entered the El Mirage Dirty 2 club in 1979 @ 201.97.
Bill and Greg were the first father and son to enter the El Mirage Dirty 2 club. They broke the D/BFR at Bonneville in 1981 @ 241 with top speed of 249. This record still stands today. In 1991 they set the A/BFR @ 261 which was later broke by Duane McKinney.
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Dean Los Angeles
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« Reply #37 on: October 23, 2009, 03:11:43 PM » |
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Tom, when you say "hit" you are talking the broad side of a barn with a sling shot or bb gun. Build a rig to hold either one and see what kind of repeatability you get. The baseball thrown without a spin (knuckleball) darts and dives unpredictably based on the air currents prevailing. If you throw a knuckleball in a still environment it would exhibit none of that. Thank God ballparks are wind havens!
The spin on a rocket, bullet or baseball imparts stability.
The flow around the golf ball isn't about the area at the surface, but the nasty flow after it separates. The same reason the flow is better on a truck with the tailgate up instead of down. The closed gate creates a higher pressure area in the bed that helps the flow.
The rotation on a golf ball with dimples imparts lift, and with the lower drag from the dimples THATS the one NASA has to track. Right Joe?
As to dimples, if you have a flow separation area the dimples might help. That's what the wind tunnel testing told you, right?
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Just remember . . . It isn't life or death.
It's bigger than life or death! It's RACING.
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Jonny Hotnuts
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« Reply #38 on: October 23, 2009, 06:13:30 PM » |
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I didnt want to give away all my secrets but I am in the mood to share. Dont f-with the golf ball dimples. For LSR you want V-riblets. http://www.designnews.com/article/235-Engineering_News.phphttp://www.newplanetech.com/riblets.pdfDont ask me where I got 3m riblet film....but this is what you are looking for. ~JH |
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"Sometimes it is impossible to deal with her, but most of the time she is very sweet, and if you caress her properly she will sing beautifully."
*Andres Segovia
(when Im not working on the car, I am ususally playing classical guitar)
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jimmy six
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« Reply #39 on: October 24, 2009, 12:54:37 AM » |
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Remember what classes allow these mods................Good Luck
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First GMC 6 powered Fuel roadster over 200, with 2 red hats. Pit crew for Patrick Tone's Super Stock #49 Camaro
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Dean Los Angeles
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« Reply #40 on: October 24, 2009, 10:03:18 AM » |
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Dont ask me where I got 3m riblet film Would you be referring to 3m Scotchcal Drag Reduction Film . . . That was so successful that they don't make it any more? |
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Just remember . . . It isn't life or death.
It's bigger than life or death! It's RACING.
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Jonny Hotnuts
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« Reply #41 on: October 24, 2009, 12:42:29 PM » |
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Would you be referring to 3m Scotchcal Drag Reduction Film I would be. And without being able to do any efficiency testing I can only state its worth from the studies I have seen. For all I know the stuff doesnt do anything....but most everything I have seen said it did increase flow efficiency a few %, when used in the correct application under the appropriate conditions. I have not used it, or other form of riblets but it has been something I have been looking into and MAY prove to be worth its salt (that was a bad one!). LSR vehicles are in many respects closer to aircraft than everyday cars and while true they dont make it anymore this could be because of the high manufacturing cost VS. the extremely limited applications that would see a slight benefit. LSR vehicles may be the limited application where riblets could prove to make a significant difference. Good to know some "movers and shakers" in the USACE!!! ~JH |
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« Last Edit: October 24, 2009, 12:46:59 PM by Jonny Hotnuts »
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"Sometimes it is impossible to deal with her, but most of the time she is very sweet, and if you caress her properly she will sing beautifully."
*Andres Segovia
(when Im not working on the car, I am ususally playing classical guitar)
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johnneilson
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Location: N 34 ° 15 ' 0 '' W 118 ° 21 ' 53
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« Reply #42 on: October 25, 2009, 10:05:39 PM » |
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Dimpling a car is very simple, leave it out in a Hail storm in Texas.
I never understood why Alamo rental car was so upset, I just "enhanced" the fuel mileage on that car...............
John
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1st Gen Miata Fiberglass and Carbon Fiber components from legendary Molds. www.jnent.net |
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Papi
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« Reply #43 on: October 27, 2009, 01:27:05 PM » |
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I'm going to beat the begeezus out of my ride with a ball peen hammer. I let you know how it felt when I'm done.  |
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Steve "Papi" Chappell
SCTA-BNI #2230, 2231, 2232
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Cajun Kid
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« Reply #44 on: October 27, 2009, 05:41:20 PM » |
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And I thought "Riblets" came from Applebee's in a basket with fry's.  |
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