sushiyummy & C&R
Join Date: Nov 2006
Location: Sandy, Deschutes are nearby
Hi Brian, I came across an article from Noel Perkins from University of Michigan. It was an article that has been floating around Sexyloops for a while.
The gist is the turning over of the loop creates a lift, slowing down the line drop. From what I can gather, this lift is generated when the top leg, turning over around the loop radius, become the bottom leg.
The article went on to show that the tighter the loop, the greater the lift. Noel also had another article to show line drop varying between densities (denser drops faster), and by thickness difference (thicker drops faster).
All this might explain:
1. Some competition lines are low floaters (reduced loop pressure even at the expense of increased line drop)
2. Low angle of trajectory (as line gets thinner, the lift contribution increases)
3. Butt section needs mass (slug effect) as it cannot depend on lift to offset line drop.
I don't know if this ties in neatly with your experience in competition casting. I casted a Carron 85' 10/11 floater today. The PVC coating is sticky soft, so maybe that plays another factor in getting tighter loops (generate higher lift). And at high line speed, very flat trajectory to get out 120'.
Conservation is nothing more than the fight to save ourselves from ourselves, work that can only be done by ourselves.
Spey casting website.