Is flipping the same thing as casting?

No, though they travel together often. Casting is the wrist angle disappearing early in the downswing, a long way from the ball, and it has its own guide here. Flipping is the lead wrist reversing at the ball itself. A caster usually arrives flipping, but you can hold a good position to hip height and still add loft at the last moment.

My divot is in front of the ball. Can I still be flipping?

Yes. The mark reports where the arc bottomed, not what the wrist did on the way there. A body that carries the low point forward can sit above a hand action that still adds loft, and the result is a thin-feeling strike that flies high and spins hard rather than a fat one.

Does flipping cost distance or height?

Both, by one mechanism. TrackMan's position is that a higher spin loft lowers smash factor and raises spin rate, so less of your club speed becomes ball speed and more of what survives becomes backspin. The flight climbs and drops steeply on a shot that felt clean. The face was not the problem. The gap was.

Can I fix it by holding the wrists longer?

Not by holding them still. In HackMotion's figures the single-figure group changes lead-wrist extension by 15.6 degrees between address and impact, more than either amateur band, so the good swing is not the quiet one. What separates them is when the last part of that change happens: roughly 0.02 seconds before contact rather than 0.07.

What goes wrong, and why

Flipping and scooping: the loft you hand back

A flip and a release are the same motion at different times. This is what those hundredths of a second are worth at the ball, what they do to the loft you deliver, and how the turf reports it.

A golfer playing a shot from short grass toward a distant green, photographed from behind at a distance. Karyn Wagner Pierpont from USA, CC BY 2.0

A flip is a release that started too early

3.6° against 10.7°Lead-wrist extension at impact, handicap under 10 against over 25

Every golfer releases. The lead wrist sits extended at address, flattens coming down and extends again through the ball. The argument is only ever about when that last part starts. HackMotion, which clamps a sensor to the lead wrist, times it at roughly 0.02 seconds before contact for professionals and 0.07 for amateurs. Five hundredths of a second is the fault.

The timing prints as an angle. HackMotion's lead-wrist extension at impact averages 3.6 degrees for handicaps under 10 and 10.7 degrees above 25, which is how cupped the back of the lead hand is as the ball leaves. All three bands start near 19 degrees at address, and the single-figure group removes 15.6 of them by impact against 8.1 for the 25-plus group. The better wrist moves more, not less.

Label the source before leaning on it. HackMotion sells the sensor those numbers came off, the swings belong to its customers rather than a recruited sample, and it reports more than a million of them without saying how many golfers sit in each band. Large, and not a controlled study.

What the wrist hands to the clubface

20.2° and 24.3°PGA Tour dynamic loft and spin loft with a 6-iron

TrackMan defines dynamic loft as the vertical orientation of the face at maximum compression, and publishes 20.2 degrees for a PGA Tour 6-iron. Attack angle, the direction the head is travelling at that instant, averages 3.7 degrees down with the same club. Spin loft is roughly the first minus the second, and TrackMan's tour figure of 24.3 degrees lands within half a degree of that.

Spin loft is where a flip is paid for. TrackMan states that a higher spin loft creates a lower smash factor with all else equal, and produces a higher spin rate. Extension arriving early adds to dynamic loft, dynamic loft feeds spin loft, and spin loft takes ball speed out and puts backspin in. The shot climbs on less speed than you paid for.

One number is missing, and it is the one this argument leans on. Nothing published converts a degree of lead-wrist extension into degrees of dynamic loft at contact. One instrument measures the wrist, another measures the loft, and the bridge is reasoned rather than counted. The direction holds. The exchange rate is unknown.

The turf keeps a better record than the camera

4 to 5 inchesWhere a good player's arc bottoms out, past the ball

TrackMan gives low point as a distance: from the clubhead's geometric centre to the lowest place on the swing arc. Adam Young puts a good player's around four to five inches in front of the ball, with the ground contact beginning just past where the ball sat. Grass writes that down on every swing, at no frame rate.

A flipper's mark reads differently. Extension arriving early flattens the bottom of the arc and drags it back toward the ball, so the scuff sits level with the ball or behind it. Often there is no mark at all, because the head is already climbing when the two meet. Read where the mark starts, not how deep it runs, and read five of them.

Hear it

Three clicks: takeaway, top, impact. Start at the tour beat and move to whichever one you can actually swing to.

Why the hit-down cue widens the same gap

The cue names attack angle and hopes the wrist follows. Spin loft has two edges, the loft the face delivers and the direction the head travels, so steepening the second while the hands still pad the first opens the gap from both ends. Andrew Rice puts it flatly: hitting down does not add compression or spin.

Rice sets two players beside each other with a 5-iron. Jack delivers 16 degrees of loft with the head moving 2 degrees down, for a spin loft of 18. Bob delivers 15 degrees, a degree less, moving 6 degrees down, for 21. Both strike it well, and Jack's goes further because the narrower gap compresses the ball more. The steeper player lost while holding the better loft number.

The geometry misfires as well. A club is only descending at the ball if the bottom of its arc lies past the ball, so the instruction that produces a downward strike is one about where the arc bottoms. Aim at the angle instead and the arc drifts backwards, leaving something to lift the head over the ground before it arrives.

What to check on the frames, after the turf

Set the phone face-on and stop one frame before contact. Put the shaft against a vertical line through the ball. Leaning toward the target means the hands still lead; past vertical means the head overtook them early. Then watch the back of the lead hand. Cupping that grows before the ball goes is the flip; cupping that appears after it has gone is the release doing its job.

Compare three swings, because the frame nearest contact is chosen by your phone rather than by you. Pebble Swing works from joint angles in the frames and the backswing-to-downswing tempo ratio in the motion; dynamic loft and spin are not among them and want a doppler unit. Check the ground first, then the frames, and only then ask whether the wrist or the body put the arc there.

Questions

Is flipping the same thing as casting?: No, though they travel together often. Casting is the wrist angle disappearing early in the downswing, a long way from the ball, and it has its own guide here. Flipping is the lead wrist reversing at the ball itself. A caster usually arrives flipping, but you can hold a good position to hip height and still add loft at the last moment.
My divot is in front of the ball. Can I still be flipping?: Yes. The mark reports where the arc bottomed, not what the wrist did on the way there. A body that carries the low point forward can sit above a hand action that still adds loft, and the result is a thin-feeling strike that flies high and spins hard rather than a fat one.
Does flipping cost distance or height?: Both, by one mechanism. TrackMan's position is that a higher spin loft lowers smash factor and raises spin rate, so less of your club speed becomes ball speed and more of what survives becomes backspin. The flight climbs and drops steeply on a shot that felt clean. The face was not the problem. The gap was.
Can I fix it by holding the wrists longer?: Not by holding them still. In HackMotion's figures the single-figure group changes lead-wrist extension by 15.6 degrees between address and impact, more than either amateur band, so the good swing is not the quiet one. What separates them is when the last part of that change happens: roughly 0.02 seconds before contact rather than 0.07.

Sources

Every number on this page comes from one of these.