Re: That dorsal fin... square fuselage would be the problem methinks, shedding woking great vortices, dorsal fin only partial solution.
You call that a dorsal fin?
This is a dorsal fin, myte!
HM I believe you are correct with your comment about the slab-sided fuselage. The Beaver presented a quirk when taking off on floats with a stiff crosswind. Even with the dock knocker ventral fin, the airplane had a tendency to turn downwind before it got on the step.