i have changed from a D4 swingweighted irons to a C6 .. Honma irons fitted with heavy sensicore shaft ..
the question is that . with a lighter swing weight , I feel more control of my shots.. however , is it true with prolonged practise , my swingspeed will get slower ?
I don't believe that you will lose swing speed, in fact, you should see a slight increase. Typically a heavier swing weight will contribute to a decrease in swing speed.
he did say he went to heavier shafts, that won't make you speed up. You might stay the same swing speed , or possibly slower if you don't have the strenth to swing it as fast.
It will depend on how you release the club. If you hold your wrist cock coming down, and release it late, you might find that a higher swing weight club will give you a higher swing speed from all the extra weight in the head. When you release the club late, you get more weight accelerating into the ball. I play D5 irons for this very reason, I get good acceleration into the ball and hit the ball farther. Someone mentioned club weight and strength being a factor here. It will be if you "muscle" the club, rather than make an easy relaxed swing. If you let gravity and centrifical force do more of the work for you, strength isn't as much of a factor in swing speed.
I am guessing you are talking about me...strength as in muscle may not have nothing to do with it. But you take a 70 gram shaft , and a 140 gram shaft. Which do you think you will swing faster? The 70 of course.
Viper; I totally agree with you, and I proved that exact thing many times to customers. All I have to do is give them a steel shaft and have them swing it. Then have them swing a graphite shaft. It's easy to tell which shaft they can swing faster that way. But when you add a weight to the end of the shaft, as in the case of a club head, you change things. Think of swinging a piece of rope. Try swinging the rope with a ping pong ball on the end of it, and see how hard it is to make it swing real fast. Now replace that light ball with a golf ball and try again. I think you will agree that you can swiing the golf ball nice and fast, but not so with the ping pong ball. If you think about this, you will see that when all you are swinging is a shaft, it's a matter of over powering the weight of the shaft, hence, you can swing the lighter graphite shaft a good bit faster. But when you have a weight at the end of shaft, as with the rope and two balls, it changes things a bit. Now, you can let the weight of the ball or club head do the work for you.
Yes I can believe that you will swing the rope faster with weight on the end of it, but there has to be a level of diminishing returns: or else everyone would have like E5 swing weights or heavier. d5 for irons is pretty heavy for todays standard. I have d3 for my supersteels and d4 in the wishons I had. Really didn't notice any different in clubhead feel.