[neil]

Big sorry neil,I wrongly referred to R/elbow as being a wedge(forgive my no-brainer),
What I meant to say was,as the R/shoulder drives R/elbow down into impact zone,at what point does the R/elbow start to straighten,or does it start to unbend as soon as the downstroke begins.I hope you follow me.Thanks again

If anything,it bends more on the initial part of the downstroke.
The right arm can only begin to straighten when the left arm is thrown off the chest.