Golf ball aerodynamics

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CarGuru > Formula-1 > Golf ball aerodynamics 10 March 2005 09:37:00

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Golf ball aerodynamics
Heikki 7 March 2005 17:43:12
	Hi, I remember reading an article of why golf balls fly as far as they do. It had something to do with the pimples on the surface which reduce drag. Has any F1 team used this effect in their designs? heikki
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Mark Hewitt 7 March 2005 17:59:48 [ permanent link ]
	"Heikki" <info----@limimetalli.com> wrote in message news:d0hlm3$n96$1@nyytiset.pp.htv.fi...> Hi,> I remember reading an article of why golf balls fly as far as they do. It > had something to do with the pimples on the surface which reduce drag. Has > any F1 team used this effect in their designs? I'm not sure but I think the dimples work the way they do because they rotate through the airflow. Of course moveable aerodynamics devices are banned in F1.
		Add comment


Phil Newnham 7 March 2005 18:10:44 [ permanent link ]
	Heikki wrote:> Hi,> I remember reading an article of why golf balls fly as far as they do. > It had something to do with the pimples on the surface which reduce > drag. Has any F1 team used this effect in their designs? The dimples cause the boundary layer to become turbulent, which delays the separation of the boundary layer, reducing the wake size. Skin friction goes up a bit, but pressure drag goes down dramatically. This works because the Reynolds number of a plain golf ball in flight is quite small, and the dimples are a way of increasing "effective" Reynolds number. The Reynolds number of an F1 car is pretty high, in comparison (although low compared to say a 747 wing), which means the boundary layer over most of the car will already be turbulent (and will therefore remain attached around steeper corners). I have seen flow "trips" (long thin strips of rough material, eg. double sided sticky tape sprinkled with sand) used on front wings, for example on early 90s McLarens, which work in the same way, causing the boundary layer to become turbulent sooner on the front wing and stay attached over the curvature instead of forming a laminar separation bubble. If you are in the UK and get the chance, visit the Donington car collection, and have a look at the front wings of the McLarens - hopefully you'll notice the strips. -- Phil
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Emma 7 March 2005 18:20:20 [ permanent link ]
	Heikki <info----@limimetalli.com> wrote:>I remember reading an article of why golf balls fly as far as they do. >It had something to do with the pimples on the surface which reduce >drag. Pimples? So that is why the drivers are getting younger & younger! -- Emma - The Chocolate Monster - http://www.chocmonster.rules.it
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A. Groenenboom 7 March 2005 18:56:05 [ permanent link ]
	indigo schreef: i vaguely remember reading about paint that copied the skin of a shark, in > that it was rough rather than smooth. After the invention of the clapskate, some Dutch skaters have tried out a 'shark suit', which resembles a shark skin, with the same effects described earlier in this thread (while still using clapskates). Small picture: http://www.ka.sara.nl/home/paul/Ties/jarno0.html Whether it was before or after, but swimmers used something alike: http://amos.indiana.edu/library/scripts/supersuits.html http://www-rohan.sdsu.edu/dept/coachsci/swimming/bodysuit/table.htm Auke -- I keep six honest serving men (They taught me all I knew); Their names are WHAT and WHY and WHEN And HOW and WHERE and WHO.
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Heikki 7 March 2005 18:56:12 [ permanent link ]
	Emma wrote:> Heikki <info----@limimetalli.com> wrote:> I remember reading an article of why golf balls fly as far as they do. >> It had something to do with the pimples on the surface which reduce drag.> Pimples? So that is why the drivers are getting younger & younger! <runs like heck to the dictionary> Pimples? No, I meant pimps! No! Dimples! Dimples!</end of running>
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Emma 7 March 2005 20:38:54 [ permanent link ]
	Heikki <info----@limimetalli.com> wrote:>What is chav? Http://www.chavworld.co.uk/chav.htm -- Emma - The Chocolate Monster - http://www.chocmonster.rules.it
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Phil Newnham 7 March 2005 22:40:01 [ permanent link ]
	Probert wrote:> Is this any help, Phil?> http://jeb.biologists.org/cgi/reprint/197/1/65 Not really - I'm more interested in the reasoning that I suspect is in the other paper rather than the pure numbers, and they're focusing on all the energy and respiration stuff in that paper. I found it interesting that instead of measuring the frontal area of the penguins they had (eg by taking a photo of the penguin swimming and working it out against the size of the tunnel) they took a result from a paper done 5 years previously, which does rather suggest that they're not trying to be too accurate about it - the error in the propulsive efficiency of the bird is probably bigger, anyway. And, I found my source - AGARD-R-827, paper 13, which I can get from the British Library. (Don't ask why Ok! -- Phil http://www.usefilm.com/photographer/31307.html
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Tony 8 March 2005 22:28:01 [ permanent link ]
	In the late 1960's Roger Penske used a black vinyl top (a common ugly feature on American cars in that era) on Mark Donahue's Camaro in the American Trans-Am series for just this purpose. It was banned after several races. "Heikki" <info----@limimetalli.com> wrote in message news:d0hlm3$n96$1@nyytiset.pp.htv.fi...> Hi,> I remember reading an article of why golf balls fly as far as they do. It > had something to do with the pimples on the surface which reduce drag. Has > any F1 team used this effect in their designs?> heikki
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Pete Fenelon 8 March 2005 22:47:57 [ permanent link ]
	tony <ttony@comcast.net> wrote:> In the late 1960's Roger Penske used a black vinyl top (a common ugly > feature on American cars in that era) on Mark Donahue's Camaro in the > American Trans-Am series for just this purpose. It was banned after several > races. Wasn't that also to hide the evidence that the car had been acid-dipped to lighten the metalwork? ;) (My copy of Donohue's "The Unfair Advantage" isn't to hand... a great book by a great driver/engineer). pete -- pete@fenelon.com "Send lawyers, guns and money...."
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Tech27 10 March 2005 09:37:00 [ permanent link ]
	"Heikki" <info----@limimetalli.com> wrote in message>>news:d0hlm3$n96$1@nyytiset.pp.htv.fi...>>> I remember reading an article of why golf balls fly as far as they do. >>> It>>> had something to do with the pimples on the surface which reduce drag. >>> Has>>> any F1 team used this effect in their designs? Yes. There was a prototype designed Calloway (not the car outfit, but the golf club manufacturer). The car was remarkable in many ways, but the size of the club needed to "launch" it was ridiculous.
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CarGuru > Formula-1 > Golf ball aerodynamics 10 March 2005 09:37:00

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Golf ball aerodynamics

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