Yeah I have GPS'ed mine many times. 30-33 MPH on some good nimhs like ib3800's or ib4200's.....
lipos? lol.....
you'll be dancing with 40MPH if you trim the boat right. Granted, thats a pretty loose hull and kinda on edge. BUT a safe assumption is 30MPH with 12 good nimhs and 35MPH with a good set of enerland lipos.
EDIT: Grant ed is correct. sorry lol.