Jump to content

Welcome. You are currently viewing the forum as a guest which does not give you access to all the great features at GolfWRX such as viewing all the images, interacting with members, access to all forums and eligiblility to win free giveaways. Registration is fast, simple and absolutely free. Create a FREE GolfWRX account here.

- - - - -

Shaft lean calculation


  • Please log in to reply
5 replies to this topic

#1 tbarra

tbarra

    Newbie

  • Members
  • Pip
  • 4 posts
  •  
  • Member #: 415696
  • Joined: 03/14/2016
GolfWRX Likes : 0

Posted 08 January 2019 - 01:19 PM

I have been struggling with some cause and effect factors in trying to lower my launch angles.
Does this make sense for calculating my shaft lean?

spin loft (dynamic loft - angle of attack) - club loft = shaft lean

I have read that the "normal" iron range is about 6 to 12 degrees (increases toward wedges).
My calculation suggests that my lean is more toward 3 degrees.


Remove This Advertisement Viewing As Guest

    GolfWRX Forums

    Advertisement


1

#2 MonteScheinblum

MonteScheinblum

    Rebellion Golf

  • Sponsors
  • 18,202 posts
  •  
  • Member #: 94238
  • Joined: 09/12/2009
  • Location:Southern California
GolfWRX Likes : 11498

Posted 08 January 2019 - 02:02 PM

You canít zero out shaft lean, or launch angle for that matter, like that.

Too many variables.  Grip, club speed, how you swing, etc.

2

#3 tbarra

tbarra

    Newbie

  • Members
  • Pip
  • 4 posts
  •  
  • Member #: 415696
  • Joined: 03/14/2016
GolfWRX Likes : 0

Posted 09 January 2019 - 04:04 PM

Not really trying to zero it out, actually I think my shaft lean maybe too low. It seems like there should be a relationship between the loft at impact (dynamic loft), angle approaching impact (angle of attack) and the loft designed into the club. Seems like the only other variable is how much angle created by the shaft lean at impact.

3

#4 Krt22

Krt22

    Hall of Fame

  • Advanced Members
  • PipPipPipPipPipPipPip
  • 5,112 posts
  •  
  • Member #: 261822
  • Joined: 07/05/2013
  • Location:East Bay
GolfWRX Likes : 2962

Posted 09 January 2019 - 05:01 PM

Not that straight forward. dynamic loft is just that, loft presented at impact. Shaft rotation and shaft pitch (raising/lowering the handle) can also impact dynamic loft

Im guessing you want to increase your shaft lean and thus lower dynamic loft to hit it further, but that is also not always desirable. PGA tour pros may have 10+ degrees of shaft lean, but much of that is a byproduct of their speed. If you dont have PGA tour speed, presenting less loft at impact may result in hitting it shorter

4

#5 Stuart G.

Stuart G.

    Legend

  • Advanced Members
  • PipPipPipPipPipPipPipPip
  • 22,130 posts
  •  
  • Member #: 174728
  • Joined: 04/12/2012
  • Location:New Hampshire
GolfWRX Likes : 6839

Posted 10 January 2019 - 06:53 AM

 tbarra, on 08 January 2019 - 01:19 PM, said:

spin loft (dynamic loft - angle of attack) - club loft = shaft lean

Well - depends on how dynamic loft is actually measured as to whether the dynamic lie angle impacts the numbers shown - can't say whether it's a factor in the numbers that Flightscope or Trackman spit out.  

But face angle/orientation and static loft will be the two major contributors to dynamic loft.   AoA is not a factor so don't bother with spin loft.

Just going from memory here but ..

start with the dynamic loft,  subtract 0.6* for each 1* the face is open or add the same for each degree it's closed.  

Then subtract that from the static loft and it gives you roughly the amount of forward shaft lean (fwd lean being hands in front of head at impact).

Edited by Stuart G., 10 January 2019 - 07:35 AM.


5

#6 tbarra

tbarra

    Newbie

  • Members
  • Pip
  • 4 posts
  •  
  • Member #: 415696
  • Joined: 03/14/2016
GolfWRX Likes : 0

Posted 13 January 2019 - 03:52 PM

I do have relatively the same club head speed based on the Trackman average pro numbers (my smash is lower) however my launch angles are all about 3-3.5 degrees higher.
I struggle a bit more on windier days and would like to lower my trajectory a bit. I was thinking shaft lean was the problem, sounds like it may or may not be....
Thanks

6



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

GolfWRX Sponsors