Having had a full keeled Lord Nelson
35 with a Maxprop (already installed when I bought the boat) I can't give you before and after results, only feathered vs. non feathered speeds. About a knot
savings at 5-6 knots.
Reverse from 6 knots to full stop with a 20k lb ++ boat? ONE boat length from 6+ knots when motoring in no wind
This was in the middle of the night in the Straits of Juan de Fuca when we came upon an unlit
net directly ahead.
The only way we saw it was the "native american" splashed his net with a spotlight, then me in the face.
These are the same who killed whales "because their treaty said they could".
Don't get me started on fishing