I'm going to build a mold to make a anchor for my pontoon. I want around 15+17lbs 3 side pyramid.
I'm curious how much angle to tapper the sides? What is better for digging into the river bottom.

I have a 10lb float tube anchor now which gets recommended a lot for 9ft pontoons...it sucks btw. Its cone shaped and works only in walking pace water under 5ft deep. And mostly drags
My buddy has a 10lb pyramid that is slightly better if at all.
We usually have to double up with another 5+lbs of anchor to actually stay in position