Beaver tail has 3 sizes and they change by the width of the pods not height. Only when the pod is under water is full buoyancy achieved, that is, if half is out of the water, you're only gaining half of that pods potential displacement. I bought my large beavertail from cabelas (cheapest price) and it cost another $150 I think to have them welded on by a marine T-top maker a couple years ago. I have no regrets and glad I have them on my 1752 lowe with a 50 Rude on the back. The pods will help some with a stern heavy boat, but if you're in general, overloading the boat, there's no replacement for displacement, ie a bigger hull would be a better decision.
I recommend searching "pods" and it should yield you some of the info you're looking for and additional discussion regarding pods. There are several threads on building vs buying and how to design/mount them etc.
Last edited by tod0987
on Sat Jan 18, 2014 9:26 pm, edited 1 time in total.