mandrin
New
There is the notion of resistance to impact deceleration. We have also the intuitive notion that one can somehow increase the effective striking mass of the clubhead. Burner has now added another version, i.e., increasing the duration of collision, leading to increased velocity.
Hence, he states above that exerting a force through impact,
(1) increases the dwell time, and as a consequence,
(2) Increases the ball departure velocity.
His post is nicely written and uses the typical pseudo scientific language which people like to hear. See for instance, Spike’s reaction:
“I've learned a lot from the scientific posts of mandrin and the other guys and I say thanks.
But, I find much more solice in the words of the burner....I love it when he talks dirty like this!”
Even if Burner proudly concludes his post with, “Now that is physics in action”, let’s see together if his idea really holds any water. His basic premise is that we can increase impact dwell time with an external force applied by the golfer.
Impact dynamics is governed by Hertzian contact mechanics and a recent scientific paper by Prof I. R. Jones in Science and Golf IV, - 'Is the impact of a golf ball Hetzian?' -, contains some very interesting information.
He studied various impacts, from the violent impact with driver to the gently tap in of a putter and found that over this huge dynamic range for impact forces the dwell time only varied very little, from 0.00037 sec for driver to 0.00085 sec for gentle tap in with putter.
One can reasonably estimate, as an order of magnitude, that the impact force for the violent impact using a driver is about 100 times that for a gently tap in with a putter. Hence a variation of approximately 2000 lbs in average impact force only produces about 0.0005 sec variation in dwell time.
The golfer with a “line of compression sustaining force” of about 4 lbs will therefore be able to change the dwell time only by about 0.2 %. This conclusion dispels hence completely and convincingly with Burner’s theory. A sustaining force has a negligible influence on duration of dwell time. However we are not finished yet.
Prof Jone’s experimental findings also showed that increasing velocity goes hand in hand with decreasing dwell time Even this last experimental finding by itself is sufficient to dispel with Burner’s theory, since he believes increasing velocity to be associated with increasing dwell time.
Now that’s real physics in action!
Hence, he states above that exerting a force through impact,
(1) increases the dwell time, and as a consequence,
(2) Increases the ball departure velocity.
His post is nicely written and uses the typical pseudo scientific language which people like to hear. See for instance, Spike’s reaction:
“I've learned a lot from the scientific posts of mandrin and the other guys and I say thanks.
But, I find much more solice in the words of the burner....I love it when he talks dirty like this!”
Even if Burner proudly concludes his post with, “Now that is physics in action”, let’s see together if his idea really holds any water. His basic premise is that we can increase impact dwell time with an external force applied by the golfer.
Impact dynamics is governed by Hertzian contact mechanics and a recent scientific paper by Prof I. R. Jones in Science and Golf IV, - 'Is the impact of a golf ball Hetzian?' -, contains some very interesting information.
He studied various impacts, from the violent impact with driver to the gently tap in of a putter and found that over this huge dynamic range for impact forces the dwell time only varied very little, from 0.00037 sec for driver to 0.00085 sec for gentle tap in with putter.
One can reasonably estimate, as an order of magnitude, that the impact force for the violent impact using a driver is about 100 times that for a gently tap in with a putter. Hence a variation of approximately 2000 lbs in average impact force only produces about 0.0005 sec variation in dwell time.
The golfer with a “line of compression sustaining force” of about 4 lbs will therefore be able to change the dwell time only by about 0.2 %. This conclusion dispels hence completely and convincingly with Burner’s theory. A sustaining force has a negligible influence on duration of dwell time. However we are not finished yet.
Prof Jone’s experimental findings also showed that increasing velocity goes hand in hand with decreasing dwell time Even this last experimental finding by itself is sufficient to dispel with Burner’s theory, since he believes increasing velocity to be associated with increasing dwell time.
Now that’s real physics in action!
