I know Tom and some others are wondering what type of yardages and such MGS produces. In Saturdays match, my 9 iron was 130ish, and 8 iron was about 145. I was playing my steel shafted Rifle flighted 5.5 golfsmith blades.

So tonight I hit some more balls, and after practicing the MGS swing, decided to hit 20 shots all with my 8 iron, all on clearkey, as I would if in a match. I had my Medicus swing speed meter on, and it records each swing and then every five swings it reports the average. So I only had to write down five numbers and then average those. The average swing speed was 85.7 mph. Looking at Trackman data that seems to correlate about right for my yardages I had on Saturday.

After I hit all twenty balls, I walked out to the group and paced off the # of feet left and right from the furthest ball each side of the flag. Of the twenty birdie balls, only two were outside the distance of four steps left or right. ( my normal step is about 26" ) So that is +/- 10 feet left or right.

So here is the math question, my birdie ball is flying 40 yards for this 8 iron, which is about 27% of the distance the golf ball flies. Would the same % apply to the dispersion left or right, about 1/3 third? Could I just multiply the +/- dispersion of 10 feet and know that for my 8 iron I am going to be no more than 30 feet left or right of my target? Or does it not correlate linearly?

At any rate there is some yardages for you Tom and others.

Kevin

Never quit til you have a swing you'll never forget!

I doubt if anyone knows how the birdie balls behave directionally as compared to a real ball. If they behave about like real balls, then some math could be applied.

Your Medicus swing speed meter seems pretty optimistic. Your distances suggest swing speeds with those two clubs of more like 75 MPH give or take. The rule of thumb is that 5 iron swing speed x 2.2 = carry distance. (Driver factor is 2.4.) An 80 MPH 5-iron carries 176 plus any roll. Each iron shorter loses about 1 MPH of head speed. These are rules of thumb given "normal" lofts and such.

I ran your specific examples through a well-regarded trajectory stats program and it also showed about 75 MPH. An 80 MPH 5 iron is a very good speed for a recreational golfer.