10-4 (Stroke Types and Variations)
The corresponding Chapter 7 translation can be found HERE.
This is pretty easy. Stroke Types are classified according to the number of Power Accumulators used.
Single Barrel = One Power Accumulator
Double Barrel = Two Power Accumulators
Triple Barrel = Three Power Accumulators
Four Barrel = Four Power Accumulators.
Homer believed that the 'swinger' could only 'max out' to the triple barrel swing because they should not use the #1 power accumulator (folding and straightening of the right arm). So, according to HK the 'hitter' is the only golfer who can possibly have a 4-barrel stroke. But Homer stated this about the 4-barrel hitter:
This high performance Four Accumulator Combination can produce many problems during its mastery by the player. But it can make the difference in top competition. Well controlled Double or Triple Barrel Combinations have little to fear from the Four Barrel Combination that is less than fully mastered.Here's a video of John Erickson, a 4-barrel hitter.
10-5 (The Plane Line)
The corresponding Chapter 7 Translation can be found HERE.
The general concept of the 'plane line' is that first you want to swing 'along the lines' of your body. So, if you have your body positioned to the right of the flag stick, the general idea is to take the club back and thru along where your body is pointed (in this case, out to the right). The plane line is the base line of the inclined plane. Here's a diagram showing the inclined plane board and notice the plane line at the bottom of the board.
In the diagram above, the plane line is in the same direction as the ball of flight. But again, that's not always the case. Sometimes the plane line can be right of the line of flight or left of the line of flight. That's what 10-5 deals with, the direction of the plane line (where the body is aimed, thus the club/plane line goes in the at direction) and the direction of the clubface.
SQUARE-SUARE - Clubface is square to the target, Stance is square to the target so the plane line can be square to the target. Standard stance for somebody who wants to hit it straight. However, with what we know about D-Plane, that puts a little bit of a twist into that formula.
SQUARE-OPEN - Square clubface, stance is open (so plane line is open/pointing to the left. With what we know about D-Plane, this is more of the stance you want to hit irons straight.
SQUARE-CLOSED - Square clubface, stance is closed. With what we know about D-Plane, *IF* you can managed to hit upward with the driver, then SQUARE-CLOSED will help you hit the driver straight.
OPEN-OPEN - Both face and stance are open. Meaning face is pointing right of the target, but the stance is pointing left of the target.
CLOSED-CLOSED - Both face and stance are closed. Meaning face is pointing left of the target, stance is pointing right of the target.