André Rennes

1 Executive summary

2 Ball & club speed — estimated from the video

Metric	Today (estimate)	6-iron #3 (Oct 14)	6-iron #1 (Oct 6)	LPGA Tour avg
Club speed	~77 mph (75–79)	76–78 mph*	75–77 mph*	78 mph
Ball speed	~106 mph (102–108)	107 mph	103 mph	112 mph
Carry (projected)	~145 yds (139–148)	146 yds	140 yds	153 yds
Total (projected)	~149 yds (144–152)	150 yds	149 yds	—
Downswing time	~0.22 s ★	~0.23 s	~0.23–0.3 s	~0.27 s (PGA)

★ fastest 6-iron downswing measured so far. * club speed estimated from ball speed in those reports too.

How these numbers were estimated:

• Contact: the clubhead is on the ball in frame 38 (18.23 s) and the ball is already ~35 in up and away in frame 39, one frame later. That clean, immediate launch points to a centered strike, not a thin or heavy one.
• Ball speed: in the image the ball moves ~185 px in the first frame after impact and ~110 px in the next. It is shrinking and slowing on screen because it's flying away from the camera, so its full 3-D speed can't be measured from one angle at 30 fps. The estimate combines that first-frame travel with his recorded 6-iron data on the same club and range.
• Club speed: from the downswing time (0.22 s, a touch quicker than the 0.23 s that produced his 107 mph) and a typical 6-iron smash factor of ~1.38.
• Yardage: projected for ~106 mph ball speed with his usual 19–21° launch at sea level (Foster City). With a lower 16–18° launch, the same speed would carry ~150 yds.

Confidence: moderate on club speed and yardage (built on 3 earlier 6-iron reports with screen data), low–moderate on ball speed (no screen, single camera angle). Logged as estimates, not as personal bests.

3 Timing & tempo — measured from the video

30 frames per second, so each time is accurate to about ±0.03 s. Takeaway starts at 17.50 s, the club reaches the top at ~18.01 s, and impact is at 18.23 s.

Tour figure: John Novosel, Tour Tempo. The hands peak at ~17.93 s while the club keeps loading to ~18.01 s; using the hands' peak, the ratio is ~1.8:1.

What it means: the downswing is quick and powerful. The backswing is a little shorter than in report #3; letting it finish (~0.6 s) would bring the rhythm back toward the 2.6:1 of his best 6-iron.

4 The reference frame — how this swing was measured

• Grid: each square is about 5 inches, scaled from the golf ball's size on screen (~5.3 px per inch at the ball), so treat distances as ±1 inch.
• Vertical center line (light green): the head's address position. Horizontal lines: the head height (white) and hip height (light green) at address.
• Two corner diagonals (green): a fixed perspective scaffold for depth.
• Paths: the red trail is the head and the yellow trail is the hands, frame by frame from address to impact. The red circle is the ball.
• Body points were tracked automatically on every frame (48 frames, 17.0–18.6 s), then checked by eye at each key position. The camera is fixed.

5 Swing sequence

Nine key positions, filmed from behind at an angle (down-the-line side). The target is into the picture, to the right.

Photos are numbered in the order they happen in the swing.

6 Position-by-position biomechanics

Club: 6-Iron, as named by André (the sole isn't shown to the camera in this clip). Logged as report #4.

Photo 1 — Address Good

• Balanced, athletic posture with the weight centered between the feet.
• Hands just ahead of the clubhead, ball in a normal 6-iron spot (slightly ahead of center).
• About 15–20 seconds of setup and waggles before the swing: he takes his time to settle and aim.

Photo 2 — Takeaway Good

• A connected, one-piece start: the club, hands and chest move together.
• The head starts to sink slightly (~1 in) as he loads.

Photo 3 — Lead arm parallel Watch

• Lead arm parallel to the ground at about 0.2 s, wide and extended.
• The head is now ~5 in lower than at address, the biggest dip of the backswing.

Photo 4 — Top Good

• Full shoulder turn with the club near parallel at the top (~0.50 s backswing).
• Hips keep their depth: they do not slide toward the ball.
• Head ~2–3 in toward the ball and still ~2 in below its address height.

Photo 5 — Arm parallel (down) Good

• The hands drop down in front of the chest; the lower body starts the downswing.
• Downswing pace is fast: arm parallel to impact in about 0.13 s.

Photo 6 — Delivery Good

• The hands are back near their address spot, with the shaft leaning slightly forward.
• The trail heel starts to lift: the weight is moving to the lead side.

Photo 7 — Impact Head down

• Clubhead on the ball at 18.23 s; the ball leaves in the next frame.
• The head is ~5 in lower than at address (same pattern as reports #1–#3).
• Hips hold their depth (no early extension) for the third 6-iron report in a row.
• Hands ~2 in toward the ball and ~3 in higher than address.

Photo 8 — Release Good

• Arms extend toward the target and the chest keeps rotating.
• The ball is already out of the picture, climbing.

Photo 9 — Finish Excellent

• Full, balanced finish, belt buckle to the target and the trail toe on the ground.
• He holds it for several seconds and watches the ball: a sign the sequence held together.

7 Where the 6-iron sits in the bag

The 6-iron is consistent at ~145–150 yds total. The gap to the 7-iron is still small; bringing the launch down is what will open a clear 10–12 yd step between them.

8 Diagnosis

9 Next steps — keep it simple

10 Limitations & next capture

• No ball-flight data: there was no range screen in the clip, so speed and distance are estimates (see section 2).
• One angle, 30 fps: the ball and clubhead move too fast between frames, and mostly away from the camera, to measure their 3-D speed directly.
• Club ID: taken from André's message; the sole isn't shown in this clip.
• Next capture: (1) the same down-the-line spot plus the range-screen photo, (2) a face-on clip at chest height, (3) 240 fps slow-motion if available, and (4) 3–5 balls for an average.

Confidence: high on tempo (frame by frame), moderate on head and hip distances (±1 in), moderate on club speed and yardage, low–moderate on ball speed.