Mike,
I hear what you're saying but I've seen the video that some have offered up & while the cue stays more level going back by feathering open & I would say that that is a good thing & certainly changes the approach angle which I would also say is good, I've noticed that the tip has dived down at the finish unless on some shots the elbow drops to keep the cue moving level.
As some have said they, I & probably many use many variations while playing the game.
As I have said before, IF there is straight/'level' tip travel in a fixed elbow there must be an associated bio-mechanism for it to occur. You & Renfo/Chris have offered similar explanations in that it is in a certain grip/wrist action. I would agree that it would have to be there as there is no other option with the elbow pinned in space.
That brings me back to the cradle grip with the cue just sitting in the curl of the fingers that I had thought was the prescribed grip for the pendulum stroke.
Do you see any way to get several inches of straight/'level' tip travel while using a cradle grip with a fixed elbow arm swing?
Best to Y'a,
Rick
Rick,
I'd have to say I think the amount of straight travel with a pendulum stroke would be about the width of a hand. It technically cannot be geometrically "straight" because we're talking about an arc, but biomechanically it is straight enough to not affect the hit on the cue ball.
It all depends on the definition of "straight". You can use it like..."You can all go straight to (insert word here)", or "I hit the golf ball straight down the fairway." The first analogy is between two points. The second will never happen, ever!
Best,
Mike