4 blade vs 3 blade outboard props

[huntin fool]

Originally Posted by Shawn Braquet

have a powertech on it, but have not had anyone add cup to it, and no D i dont have a knife on it but sometimes wish i did since my vinton lease grows up BAD this time of year, seems like the 40 mercs my uncles run can throw the grass when getting on step but i just blow out if i have any on my prop, gets old backing up then starting over or raising the motor every 100 ft but the tunnel has helped a lot with this problem

When was the Hydrualic jackplate added?
Thats bad to the bone!