I have a 20 ton northstar splitter that I bought used 2years ago.It has a thin splitting wedge like bwise.157 splitter has.
If I get 20 inch or larger wood,I quarter it out.I like that thin wedge better than a wide wedge.Only thing against my splitter is I wish the wedge was taller.
I have used splitters with a wide wedge and had wood split but their was so much force built up, that the wood would launch out from the wedge.This is on splitters with the wedge is welded to the beam.And i have seen the beam want to twist also.
You mean like this: