although a 3.5 it has the output nearer to a 5
I have heard good reports of this motor, but I would be surprised if this really is true.
If it is
, then how many hp would the "5hp" engine produce, given that its cylinder capacity is 35% greater than the "3.5"? The 3.5hp engine is actually the same capacity as the 2.5!
According to the Tohatsu web site www.tohatsu.com/outboards/
the 2.5 and 3.5hp motors are both 74.6cc and the 5hp is 102cc.
I would be surprised if the 3.5 would get you anywhere against a tide. It might make a reasonable anchor though . . .