Quote Originally Posted by CrappiePappy View Post
At that speed I would think you'd need about 25ft of line out with 1oz weight.

IMHO ... 0.8mph is Pushing speed, not Spider Rigging speed.

I don't use any weight/speed rule, but I do use a line angle of around 45deg (right triangle calculation) and multiply the length of line out by 0.6 for quick "in my head" depth calculations. I can figure that for every 5ft of line out, my weight will be 3ft deep ... or fine tune the depth by multiplying the length of line by 0.6 ---- so if I want the weight at 9ft I'd let out 15ft of line, or 20ft of line to get to 12ft deep. But say I need the weight/bait running at 17ft deep ... I'd let out ~ 29ft of line (29x0.6=17.4)

I'm running 20lb mono & 30lb braid main lines connected to my weights (1oz) and a 1/16oz jig on a 2-3ft leader line (6# test) and Push at around 1mph. That's when I use the "5' out = 3' down" on a 45deg angle line calculation. Rod tips are generally about 1ft above the surface.
45 degree is very extreme for any application, I don't float along with that theory. Main lines / rigs should be in the 15 to 20 degree category, we ain't pulling them from under the boat. Why I hate power trolling cranks, I despise pulling them fish from under the boat.