transom edge sharp or not

Does the transom edge need to be sharp on my boat?

I calculate a Froude number of about 0.9, based on a 9m/s velocity and a 10 meter long hull. If the calculation is bad, forgive me, I can redo it.

Someone told me the boat would go 2-3 mph faster with a sharp edge.

 

This is almost full planing speed, so the transom must be as sharp as possible.
JS

 

"Sharp" needs to be defined, but losing 2-3 mph would require some kind of crazy radius.

 

How's this? Sorry bout the rotation.

 

Nothing to worry about, I'd say.

 

Mr E. is right.

That radius will not cost you 2 to 3 MPH. If you make it into a sharp edge the corner will become vulnerable to chipping and breaking which may cost more speed that you might have gained

 

The sharp edge helps the boat to develop lift faster, to plane faster, and to avoid the transom running deeper in the water
at high speeds (avoiding increased drag). A rounded trailing edge goes against all that. Race boats never have a rounded
trailing edge unless someone got sloppy. The correct Froude nr. is the depth F-nr. at the transom.

 

To all. I did in fact run a bead of cabosil and milled glass there. Both will be finished sharp, but paintable sharp.

Thanks.

 

True, but some chipping is better than a rounded edge for performance. All five of my classic runabouts have sharp trailing edges.