Thursday, July 22, 2010

Acceleration Show Part I & II

Here are parts I and II of a Mike Jacobs 'acceleration show' using FlightScope.

A few things:

1) I just asked Jacobs as to why exactly they disregard the acceleration profile after impact. If it's something that they feel FlightScope cannot accurately measure, that's understandable. If it's something they don't feel is important, I may question that.

2) Here's a reason why I'm not too keen on FlightScope as blog follower and teaching professional John Graham has pointed out on his Web site ( that FlightScope has problems with accurately measuring the attack angle. And because the attack angle effects the path, you have to question how accurate the path is as well.

For instance, if I got it correctly, Jacobs' numbers looked like this:

-3* attack angle
-0.1* HSP
-1.6* path
65* VSP

As Jacobs mentioned, his Vertical Swing Plane (basically the downswing plane) was a bit too upright. What we know of the VSP the more upright, the less you need to swing left to 'zero out' the path.

But even still, it's showing an HSP of only -0.1*, yet the path is going left -1.6*. Those numbers don't quite add up to me as his path should be a little out to the right with that HSP (-0.1*) and that attack angle (-3*).


1 comment:

Anonymous said...

You're right.

The negative angle of attack should move the True Path to the right of the HSP.

Could be something like the accuracy of the measurements are within +/- 1.5 degrees.

A little too much margin for error for my taste for anything like this over a thousand bucks.