RE: Big Swamp Buggy ??'s
I will see if I can get some pics tonight. It will all be very clear after seeing these.
In my experience -it is a better snow runner without the insert in. The insert did however help my underpowered BSB in the water. It is running a .40 Thunder Tiger that is just not enough in the water.
As for snow running I did fiberglass the sponson bottoms w/ 2 oz. cloth and epoxy, still, if you run on ice it tends to chew up the bottoms of the sponsons. With the right conditions I've seen 40 -50 mph ending in a GIANT loop over - It survived two of those before the rudder / engine broke - off.