JMmadrid escribió:Claro que influyen las estrías. Cuanto mas rugosa sea la cara del palo mas agarrara la bola, si no por que los wedges machacan tanto las bolas y según van teniendo uso van perdiendo agarre?
[cell class=spoiler]There are a few more topics to consider about spin: grooves and gear effect.
Grooves do nothing for spin if there is clean, dry contact between the clubhead and the ball. Yes, I know this is counterintuitive; but it's true. So what about all the buzz you hear about the spin produced by square grooves?
For a little more insight into how and why square grooves help, let's think about automobile tires for a moment. Why do tires have tread patterns? To grip the road? Nope! If that were the case, then why would racing cars on a dry track wear "racing slicks", tires without any tread at all? The purpose of slicks is to have as much surface as possible in contact with the road. That, not a fancy tread pattern, will maximize traction. In fact, a tread pattern reduces the area of rubber in contact with the road.
So why do we have deep tread patterns on our non-racing tires? Because we don't always drive on a dry road. For all-weather use, you need a tread pattern to prevent hydroplaning, which is a complete loss of traction when the space between the tire and the road is filled with lubricating water. The grooves in the tread give a place for water to be channeled away, so rubber remains in contact with the road. If you look in a racing tire catalog, you'll see the different categories racing slicks and racing wets; even racers don't use slicks when the track is wet.
So how does this apply to golf clubs? It's a fact that grooves -- square or otherwise -- have little effect on spin for a fairway hit or a tee hit. Spin comes from the conversion of sliding to rolling as the compressed ball moves up the clubface. A ball compressed on the clubface by hundreds or even thousands of pounds of force can hardly get more friction than it already has, even if there are no grooves at all. (A study reported in Cochran & Stobbs gives more detail on this.)
But suppose there's some nice juicy grass between the clubface and the ball. It may provide enough lubrication to allow the ball to "hydroplane" on a smooth clubface. Like the tread on a tire, the grooves provide somewhere for the lubricant to be channeled away and allow steel to be in intimate contact with the ball.
So why are square grooves more effective than V-grooves in channeling away slime? The square grooves have a bigger volume, as you can see from the figure above. Remember, the USGA and R&A have rules setting the maximum width and depth of grooves. For the same width and depth, the square grooves have twice the volume; it's simple geometry. So you can channel away more lubricant with square grooves than with V-grooves. You may still lose some spin, but you lose less with square grooves.
I'm sure you've heard TV announcers talk about pros "hitting a flyer" from the rough. Now you can understand what's going on. The grass between clubface and ball lubricates the contact, allowing more sliding to take place. The results are:
Less spin, of course.
Higher launch angle! Because of the reduced friction on the face, the ball accelerates upwards more -- so it takes off much closer to the direction the clubface is pointing.
The combination of higher launch and lower spin allows the ball to fly farther -- a flyer. As a "bonus" (but one the player usually doesn't want) the lower spin means it will roll farther after it has already flown the green.[/cell]
Plataforma por un mundo scratch, a medal, de blancas, con blades, lloviendo y con viento.
El golf es un juego de pastores escoceses, así que dejaros de pijadas.