So, we now have another abbreviation in the swimming jargon: SF :-) ?
Again, you didnt pick the right start point. The start point is not where the hand is still gliding forward, but the point where it starts pressing water back. Thats where the slipping starts.
The slipfactor is only about the backward pressing phase of the underwater armstroke. It gives an indication how much hold you have on the water. How much the arm is slipping.
If you pick a point where the arm is still moving forward you get a much lower slipping factor, because then you add up negative slip (hand moving forward in the water) and positive slip (hand moving backwards in the water).
With a stationairy background you can determine pretty precise when the hand starts to move backwards.
But, its fun that someone else is also interested in this stuff.
Last edited by Zenturtle : 09-20-2018 at 04:51 PM.