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Building a matched MOI set of irons

R*ck343 said: I want to build a set of MOI matched irons and want to use the TT Dynalite SL R-300 shaft. My question is, Do I tip trim each shaft according to the recommended lengths, or tip each shaft the same length and then but trim to length? I want to use the G40+ heads from Golfsmith and the Winn W6 mid size tour wrap grip.

d*ve. said: How are you measuring the MOI? I think its half a swing weight point for each 1/2" drop in length, can't remember, which suggests its easier to use taper tips, and then butt trim, you then can weight the heads and use tungsten to adjust the swingweight. Thats how I'm doing mine when my shafts get here on its canoe trip across the Atlantic

R*ckinMA said: how did you find your target MOI? did you build a demo 6 or 7 iron and find the ideal swingweight for you? Once you do that - say your 6 iron is best at whatever length and D-0 swingweight, you then build +/- 3/8" and +/- 0.5 SW from there (7-iron would be 3/8" shorter and 0.5 Swingweights heavier, 5 iron would be 3/8" longer and 0.5 SW lighter) - this is assuming you're using heads that are 7grams apart I think Golfsmith's new stuff is 8 grams apart - if that's the case, you use regular 1/2" increments you could also look into True Length Technology

S*lverUberXeno said: MOI is not about swing-weight, n'est pas? If my understanding is correct (as the set I play was MOI matched for me), MOI could be measured by setting the club on a fulcrum and having it press up against a spring. The clubs, being different lengths, even if the heads and shafts all weighed the same, would produce different pressure on the spring due to torque (weight at a distance). MOI matching produces a set that, even at different lengths, puts the same amount of pressure on the fulcrum througout the set. Your 4 iron and pitching wedge would be weighted differently, but the end result is that a constant amount of force would be imparted on the spring. So they would all feel the same to you, and I, springy, since the torque (not in relation to the shaft property) is the same. Depending on what weight you have to add, your swing-weights and shaft flexes may end up different. Understand that these are at the cost of a more important characteristic. I think.

R*ckinMA said: Quote: Originally Posted by SilverUberXeno MOI is not about swing-weight, n'est pas? If my understanding is correct (as the set I play was MOI matched for me), MOI could be measured by setting the club on a fulcrum and having it press up against a spring. The clubs, being different lengths, even if the heads and shafts all weighed the same, would produce different pressure on the spring due to torque (weight at a distance). MOI matching produces a set that, even at different lengths, puts the same amount of pressure on the fulcrum througout the set. Your 4 iron and pitching wedge would be weighted differently, but the end result is that a constant amount of force would be imparted on the spring. So they would all feel the same to you, and I, springy, since the torque (not in relation to the shaft property) is the same. Depending on what weight you have to add, your swing-weights and shaft flexes may end up different. Understand that these are at the cost of a more important characteristic. I think. you're right - my comments related to swingweight are a poor man's basic MOI match - swingweight is a completely made-up system, however, 80+ years ago, when they came up with it, they understood the basics of MOI and tried to put it into a scale - it just so happens to work out that -.400" and + 0.5SW approximates an MOI match pretty well