Earl Pike Posted February 13, 2012 Share Posted February 13, 2012 If the dimples on a golf ball make the ball fly faster for longer, would severe hail damage on a Warrior have the same affect, making it fly faster for longer? Earl Pike Link to comment Share on other sites More sharing options...
Tomo Posted February 13, 2012 Share Posted February 13, 2012 Does it make it fly faster, or just helps with it tracking true? (other than getting blown around in the wind currents) Link to comment Share on other sites More sharing options...
djpacro Posted February 13, 2012 Share Posted February 13, 2012 Yep, dimples on a golf ball reduce the drag. 1 Link to comment Share on other sites More sharing options...
dazza 38 Posted February 13, 2012 Share Posted February 13, 2012 What we need is Golf Ball designers to design aeroplanes. Link to comment Share on other sites More sharing options...
djpacro Posted February 13, 2012 Share Posted February 13, 2012 I got involved in the aerodynamics of this at one stage:http://www.navy.gov.au/Nulka Dimpled skin gave some useful reduction in drag with higher speed and greater range. Higher cost to produce though. Go through this stuff from NASA - I'm sure all will be explained here somewhere http://www.grc.nasa.gov/WWW/K-12/airplane/index.html eg stuff like this http://www.grc.nasa.gov/WWW/K-12/airplane/dragsphere.html Link to comment Share on other sites More sharing options...
Tex Posted February 13, 2012 Share Posted February 13, 2012 I saw a myth busters episode where they did it on a car, the increased fuel economy was the gauge... I wasn't really fussed on the way they measured that, but it did show a significant improvement... a reasonable proof of concept experiment I thought. Link to comment Share on other sites More sharing options...
PapaFox Posted February 13, 2012 Share Posted February 13, 2012 I have heard of some one years ago whose plane copped a dose of hail dimples, quite possibly a Mooney. Anyway, they thought it flew better after the damage and didn't want to get it repaired. Link to comment Share on other sites More sharing options...
Admin Posted February 13, 2012 Share Posted February 13, 2012 One of our site members got severe hail damage to his Sportstar a few years ago (about 5years). Matt, the owner of "Dimples" sold the aircraft to Gregg at Port Macquarie (also a site member) and to this day I believe the aircraft is still called "Dimples" Link to comment Share on other sites More sharing options...
youngster Posted February 13, 2012 Share Posted February 13, 2012 Air gets caught in the little dimples, so you have air flowing smoothly over little pockets of air, instead of air flowing over fabric/paint/aluminium which creates more drag. I have wondered before why someone hasn't done it for aircraft. I suppose cost is an issue, although surely it would be relatively simple to produce pressed dimpled aluminium sheeting? Link to comment Share on other sites More sharing options...
facthunter Posted February 13, 2012 Share Posted February 13, 2012 Vg's do the same thing, especially at increased angle of attack. It's to assist boundary layer "maintainance"?. The earlier the flow separates, the larger the turbulent area at the rear of the object, which represents lost energy. An already streamlined shape may not produce the same level of improvement Nev Link to comment Share on other sites More sharing options...
Guernsey Posted February 13, 2012 Share Posted February 13, 2012 You can further increase the speed by replacing the prop with a couple of no.9 Drivers. Putter Alan. 1 Link to comment Share on other sites More sharing options...
djpacro Posted February 14, 2012 Share Posted February 14, 2012 An already streamlined shape may not produce the same level of improvement Nev Will not. In fact drag will increase either by earlier transition from laminar to turbulent boundary layer or ........ a big subject if we get into what may be done to reduce friction within the boundary layer...and other stuff like http://www.angelfire.com/ks2/janowski/other_aircraft/AG14/Marvelette.html ... but of course, that is not the purpose of dimples on a golf ball. Link to comment Share on other sites More sharing options...
Yenn Posted February 14, 2012 Share Posted February 14, 2012 It won't fly faster, but it will fly longer, to get to the same destination. The reason dimples are not used on a plane is that they are good on a ball which may not always be aligned the same way. If the ball was a good streamlined shape it would be better than dimpled, but the sharp bit at the back would get a hell of a hiding from the club. Link to comment Share on other sites More sharing options...
Camel Posted February 14, 2012 Share Posted February 14, 2012 One of our site members got severe hail damage to his Sportstar a few years ago (about 5years). Matt, the owner of "Dimples" sold the aircraft to Gregg at Port Macquarie (also a site member) and to this day I believe the aircraft is still called "Dimples" Hi. Yes Dimples lives in Kempsey and is used for Flight Training by the owner for Mid Coast Flying. Dimples still has the hail damage and because of the colour it is not easily noticed, the plane flies exceptionally well and has a good cruise speed and respectable fuel burn. Everybody who flies it is impressed and it is treated with love and care being waxed and cleaned regular and kept in perfect condition the small hail dents never put me off. According to Peter the Sportstar agent the Evektor engineers have had a look at it when it was at Avalon years ago and commented it was fine and flew better. This Aircraft also is the first production Sportstar in the world and has just on 1020 hours and has nil faults. It has been a pleasure to own Dimples and pleasure to fly, I would find it hard to part with even though I have another aircraft. Dimples is a good example of a hail damaged aircraft with no structual faults and flies very well if not better. 1 Link to comment Share on other sites More sharing options...
P4D Posted February 15, 2012 Share Posted February 15, 2012 A golf ball rotates through the air at a very high rate of spin. Hopefully your aeroplane does not. 1 Link to comment Share on other sites More sharing options...
facthunter Posted February 15, 2012 Share Posted February 15, 2012 the effect is not dependent on rotation. It will curve if it rotates nev 1 Link to comment Share on other sites More sharing options...
Earl Pike Posted February 15, 2012 Author Share Posted February 15, 2012 the effect is not dependent on rotation. It will curve if it rotates nev My plane only rotates at a high rate when I fly it, straight and level is not my forte'. Earl Pike Link to comment Share on other sites More sharing options...
P4D Posted February 16, 2012 Share Posted February 16, 2012 "the effect is not dependent on rotation. It will curve if it rotates nev" Not true Nev. If it curves it is not rotating about the vertical axis and has been propelled with a blow offset to the trajectory line. Link to comment Share on other sites More sharing options...
facthunter Posted February 16, 2012 Share Posted February 16, 2012 Believe that if you must. I don't. Nev 1 Link to comment Share on other sites More sharing options...
P4D Posted February 16, 2012 Share Posted February 16, 2012 Good reply Nev. I can see you are not interested in facts and only want to be opinionated and heard. Bye Forum Link to comment Share on other sites More sharing options...
facthunter Posted February 16, 2012 Share Posted February 16, 2012 I'm only one person of many here. Don't quit the forum because of a few words I have said. I am interested in the facts . You have made a statement refuting something I said. That's fine and your right, but you have the obligation to provide more facts, as I don't accept your statement as it stands., which is my right .Isn't this the way things are discussed?.. Nev Link to comment Share on other sites More sharing options...
djpacro Posted February 16, 2012 Share Posted February 16, 2012 Well P4D, we can look at the facts - refer my link to the NASA website in an earlier post - and then consider that a blow offset to the trajectory line would seem to me to impart a spin around the vertical axis. Spin about a horizontal axis perpendicular to the flight path can create lift which increases the range. Any reason to spin it about the other horizontal axis? Perhaps, but I'm not a golfer.I should add a disclaimer - been years since I've looked at the info at that NASA link and many many years since I've studied the aerodynamics of golf balls so my aging memory may let me down. Link to comment Share on other sites More sharing options...
Geoff Posted February 23, 2012 Share Posted February 23, 2012 Sorry boys But Dimples is Only for Drinking Link to comment Share on other sites More sharing options...
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