Sail drives are far more efficient than a shaft and a P bracket. Less drag, better prop angle. Better in reverse. Bone dry bilge. Less noise and vibration. My sail drive required only minimal annual spring maintainence. Nothing could have been easier.
With all due respect Bob (and others): while I agree with you about better prop angle, less drag? It seems to my (simple) mind that there would be more wetted surface area, therefore more drag with a sail drive.
Better in reverse, is subjective. I know and anticipate prop walk. And, bone dry is only as long as the membrane seal is intact. Otherwise...
My motor mounts are relatively new, so noise and vibration are not an issue...
Maintenance on my PSS Shaft Seal is: every 6-8 years I must:
- unbolt the coupling
- back the set screws out of the coupling
- remove the coupling from the shaft
- remove the clamp collar from the shaft
- remove the set screws from the stainless steel seal
- slide the propeller shaft aft
- remove the stainless steel seal
- remove the two stainless steel hose clamps from the PSS "bellows"
- remove and replace the "bellows"
- re-assemble with NEW SET SCREWS
I don't have to touch the engine mounts (don't need a block & tackle), as I believe is the case with the Sail Drive.
I readily admit that this is far MORE complex than simply repacking a traditional stuffing box, but the stuffing box is designed to leak a few drops into the bilge while in operation. I also believe that noise and vibration are slightly more of an issue with the traditional stuffing box...
Not looking to start a "mine is better than yours" thread, but I would like to learn your opinion.