Is there a karcher jet man enough to really strip antifoul?

[obmij]

Does a super smooth hull make any measurable difference to boat speed, in an average cruising boat?

Personally, I have my doubts

 

[Daydream believer]

I had a word with Bradwell marina staff & they have a subcontractor from Mayland who does sand blasting jobs on steel work etc
I crossed the chaps hand with 200 sobs & he took the lot off, baring a 50mm strip around the water line.
I know some say it needs soda but he was very gentle in the way he did it so no harm done to the boat. If I had thought he had been a bit hard i would have applied a couple of coats of epoxy but it was not needed
I needed it all off to apply coppercoat. However if you are only going to re antifoul then he can be a bit more gentle & get down to the first coat & stop there.
Personally if going the whole hog then coppercoat is the way to go

 

[Daydream believer]

Does a super smooth hull make any measurable difference to boat speed, in an average cruising boat?

Personally, I have my doubts

I made the mistake of not fairing it off properly one year & there was a definate loss of speed

 

[JumbleDuck]

Does a super smooth hull make any measurable difference to boat speed, in an average cruising boat?

Personally, I have my doubts

I wouldn't have thought so. There are three sources of hydrodynamic drag: skin friction (shear forces in the fluid at the hull surface), profile drag (pressure distribution around the hull) and wave-making drag. Of these, the surface finish only significantly affects skin friction, which is the least significant at any speed. Wave making matters most - that's what limits hull speed.