Backspin?

[GingerGolfer]

Let's look at it this way.

Let's take track man on this. Let's say you spin your wedge at 2.7 x club head speed x spin loft.

Let's say you have a 60 mph pitch shot

Let's say you have a dynamic loft of 35 and an angle of attack of 3, that's a spin loft of 38, and about 6156 rpm

Let's say you hit more down, and are able to maintain same dynamic loft (unlikely), let's say 6 degrees down. Your rpm is only 6643.

To put into perspective, 500 rpm is less than a pros average change in spin rate between typical irons, like going from a 9 iron to a PW. The spin gap is around 700 rpm.

That is not a big jump, not enough to make drastic effect on how far back the ball will travel. It might allow you to draw it back, if the previous spin rate is at the borderline for you.

Also the more you hit down, the more likely you'll hit the ball at a glancing blow. A shallows attack allows the club head to strike the ball much more solidly, which will ensure consistent sip rates. What if you hit down and hit it poorly, now you just hit it lower with much less spin, there goes the ball way past the hole.

Yes I agree with all of this, I was just saying in a perfect world where you hit it perfect every time.

[mdl]

Let's take track man on this. Let's say you spin your wedge at 2.7 x club head speed x spin loft.

Awesome.  Thanks saevel.  Is this the actual trackman equation (ie, presumably validated on golfing machines and/or lots of high speed camera samples of real shots, though not sure how you measure spin rate on an actual ball super accurately!)?

That totally explains my first paragraph, about how green side shots intuitively make me want to think spin loft has a bigger role to play for ball spin than it does on full shots.  If your club head speed is only, say, 20mph, then a 15% change in spin loft (something more possible while maintaining consistent ball striking on a pitch/chip than a full swing) is going to have a WAY bigger relative effect on ball spin than with full swing club head speeds.

[iacas]

Is this the actual trackman equation?

No.

For one, spin increases up to about 45° spin loft, then it will start to fall off again from 46-90°.

[saevel25]

It was on Trackman's most current pdf on spin loft. Which has now been taken off the internet, but about a month ago, they estimated spin at 2.3 to 3.0 multiplied by club head speed and the spin loft in degrees.

So it was a trackman's equation, at the time I was using what I was given ;)

If their is a better way to equate spin, let me know.

[BuckeyeNut]

Green conditions play a big role.....

A golfer with a 12 index rarely makes pure contact, so I question whether creating spin is what he is experiencing.  If he nips the ball that clean, he shouldn't be a 14HC.  If he plays a course with very soft greens, he might mistake  playing into mushy greens for creating spin.

[mp33 man]

Green conditions play a big role..... A golfer with a 12 index rarely makes pure contact, so I question whether creating spin is what he is experiencing.  If he nips the ball that clean, he shouldn't be a 14HC.  If he plays a course with very soft greens, he might mistake  playing into mushy greens for creating spin.

I have to agree with this. When I'm playing in the dry months I rarely get any club other than wedges to back up but during the wet months (right now) I spin the ball back with almost every iron or wedge. A good example, three weeks ago I spun a 7i about fifteen feet off the front the green. Also saevel, if you happen to be a "picker" then you are correct, you prob won't get a ball to spin when you take a big divot because you have struck the ball poorly but if you are a "digger" then you will not spin it more with a picked shot... Steeper angle also does not always mean taking a bigger divot but steeper angle generally does mean more friction between ball and clubface (i.e. spin).