Congruent planes are two different planes with the same angle in degrees....two parallel flat surfaces...Hardly Hardy !!!! Not one plane but two congruent planes.....so a one plane swing is two congruent planes...A Two Plane swing is a vertical + a horizontal that = an inclined plane that really means 3 planes...
so a one plane swing is a two congruent plane swing...
and a two plane swing is really a 3 plane swing...vertical + horizontal = inclined...
Hmmm...I'm just plane confused!?!?!
or am I?????
The plane that matters is the sweetspot plane......that is moving in angular motion...I agree with an earlier post!!!