Swing speed varying from 75 - 89 mph at Golfmart.

[orchard53]

Wakeup call for me - I believe the numbers as I get a few good drives in a round (220 carry?) but several that don't go very good. So I don't think it's equipment, it's me.
I don't believe the efficiency numbers they showed, seems it was 1.45 majority of time.

During testing, fitting, or a simulator do you see large variations in clubhead speed? What have you done to get more consistent with your driver swing?

At least now I know why when I have a great swing, the ball really flies compared to not so great swings - this happens across all my clubs. My playing partners usually make a comment that the good ones were a really smooth swing, nut I can't tell what I'm doing different. I do recognize the ones where I try to kill the ball.

Thinking about getting a PRGR launch monitor to start capturing data. My one thought so far is reducing tension in arms and shoulders seems to help.

I'm not buying any new driver until I get some consistency.

 

[orchard53]

Let's see some video of what you're doing. It's probably all that you mention as well as some pretty big swing flaws. The speed will come from better technique,

I might recommend you spend money on a tripod to hold your iPhone, and learn how to video yourself and see what you're doing, get some coaching...way more reliable than numbers from a machine.

numbers pretty reliable, they correlated with my drives. I was just in a rut and overthinking my swing, so it wasn't free. I didn't realize how much controlling the swing impacted clubhead speed. Seems right now golf is a mental game for me, need to be able to relax and swing every shot.

 

[rocullen]

just using the WAG theory, I'd guess that your body rotation was fluctuating. A good turn one time, no so good a couple others.

And as some one touched upon, may have been variations in the "looseness" or "tightness" of the swing.

I'm no pro or even a low handicapper(don't play enough) but when I'm ripping off pretty good drives for my 67 year old body, I'm thinking swing fast, not hard.
For me, when I want to swing hard, I tense up and probably hinder a full flowing swing with tight hands and arms.
When I think fast the arms and hands are looser and the release is automatic, I don't initiate it, it just happens