The ideal launch angle for most greens is between 0.75 and 2.00 degrees. Slow greens or greens that have a lot of grain require up to 2 degrees of launch angle to get the ball up and riding on top of the grass.
If the launch angle is too high, as is the case with the putt shown above (4.03 degrees), the ball will launch into the air (even at 6 mph), high above the grass and bounce as it's moving towards the hole.
While the ball is bouncing, it has a greater chance of being deflected off line by either the side (hook or cut) spin or imperfections in the green.
Common causes of high launch angle
- too much dynamic loft at impact
- breaking the wrist (flipping) just before impact
- having the ball too far forward in the stance
- putter with too much static loft
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