A boat on plane is on top of the water. It's actually riding on the water's surface tension rather than floating. Most sailboats don't plane, although some racing scows can. A 3.5 is unlikely to plane anything. Ballpark, the boat needs to be moving over 25mph.
Surely not likely to plane with a 3.5.You can plane a boat at about 12 to 15 mph.But your 3.5 isn't likely to get you there.
With a very light fast boat and a 80 pound driver it might plane.