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HiTrajLoSpin

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  1. When I first read your measurement tolerances (1 gm and 1 mm), my thought was "those are way too small". However, doing the calculation shows that the best absolute error that can be expected with such tolerances is about 0.5 SW points ... wow! Propagation of error shows that when a result is the product of 2 quantities (i.e., distance x weight in this case), then the relative error in the result is the sum of the relative errors in the individual quantities. Let's assume that the club to be measured is a 5-iron, 38 inches long, weighing 400 grams, balance pt 29 inches, and SW D0.0
  2. There are 500 inch-gm between A0-B0, B0-C0, C0-D0, etc. , so that corresponds to 50 inch-gm between A0-A1, B0-B1, C0-C1, etc. Therefore, an error of 2 SW points (e.g., D2 vs D0) is equal to 100 inch-gm. D0 is equal to 6050 inch-gm, so an error of 100 inch-gm corresponds to an error of 100/6050 = 0.0165 or 1.65% . Is that too much? Seems somewhat high, considering that an error of 1 lb. out of 150-250 lbs (0.66% - 0.40%) on your household scale is probably expected.
  3. The crossbar for the Net Return Pro Series 2 is 7.5 ft high; if your ball-net distance is 10 ft, a little trig shows that any ball launching at an angle greater than about 37° will travel over the crossbar. Obviously, an individual's launch angle will depend on the club head loft, dynamic loft, and angle of attack. But I don't think that it's unreasonable to see launch angles greater than 37° when hitting 58° - 60° lob wedges.
  4. I've got the Net Return Pro Series 2 net in my garage setup, with 7 ft from Mevo+ to ball, and about 10 ft from ball to net. Hitting a full or high trajectory 58° is a no-go, as it's easy to send a ball over the front crossbar. I'm planning to add the 'No-Fly Zone' attachment in the near future, because I'd like to maintain as much ball flight distance as possible.
  5. Titleist TS2 10.5° head in excellent condition with untipped Ventus Velocore Blue 5R shaft. $425 shipped continental U.S. Shaft Sold. Head or shaft only: $225 $200 $175 shipped continental U.S.
  6. Looking at the clubs in your signature, the first thing that I noticed is that you're carrying a 3-wood (14.5°). That's the type of club that most seniors don't hit much, if any, farther than a 5-wood. One option would be replacing it with a higher-launching 7-wood (20.5° - 42 in.) to fill the gap between your 5-wood (17.5° - 42.5 in.) and 4H (22° - 39.75 in.) Another option would be to replace the 3-wood with a 60° lob wedge at the bottom end of the bag; that might help more with your scoring, provided that you become adept with it.
  7. However, the current P series models listed doesn't include the P770: 3 4 5 6 7 8 9 PW AW Prior P Series Models P730, P750, P770, P790 (2017) 39.13 38.63 38.13 37.63 37.13 36.63 36.13 36.00 36.00 Current P Series Models P7TW, P760, P790, P790Ti 39.00 38.50 38.00 37.50 37.00 36.50 36.00 35.75 35.50
  8. (1.005)^10 = 1.0511 or 5.1% increase, not 12%
  9. Great condition (other than small amount of missing paint fill, see pics), includes head cover $215 $200 $185 $175 shipped lower 48
  10. I'm not privy to how LM manufacturers' software is written (I was just playing with my own software to see if I could develop something that matched published golf ball flight data). But in general, yes, the basic differential equations for the (straight and curving) flight of a spinning sphere through air are well known and must make some assumptions regarding drag, lift, and spin decay (i.e., although a ball is launched with a certain spin rate, that rate isn't constant but is reduced during flight via drag just as the initial velocity is reduced via drag).
  11. I'm unaware of LM operator adjustable controls. But during software development the required drag, lift, and spin decay parameters probably have been tweaked to get an acceptable fit to actual data. For example, what is the spin decay model and its associated rate constants?
  12. Having played around with writing some software to do such calculations, the other important parameters are drag, lift, and spin decay, which can all be "adjusted" to enhance the distance.
  13. I'm enjoying the discuss here, as I'm really interested in what golfers in my age/hdcp/distance (69/9/220-230) category are playing. I'm currently playing either Tensei CK Blue 75HY R or CK Red 65HY R in my 21° and 25° hybrids; however, I'm looking for a somewhat higher launch and wondering if anyone has tried the Graphite Design AD HY 65 R / AD IZ 65 R1 hybrid shafts or Fujikura Ventus HB Blue 6R/6R2 shafts?
  14. You indicate high easy launch in the i500 irons, so it's interesting to me that you're playing Modus 105 instead of the NS Pro 950GH, which are lighter and higher launching. Did you try them? Boomer Sooner!
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