Join Date: Mar 2011
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You've probably already figured this out, but I just got back on the Sailnet forum and thought I'd chime in since I replaced the prop & shaft on Opti during haulout back in Fall of '09.
On this project I replaced the original fixed blade prop with a Martec folding prop, hoping for better sailing performance and reduced prop-walk in reverse. Clearance for the original prop to hull was 1/2". We decided to move the prop towards the leading edge of the rudder to increase the hull clearance, all calculated prior to cutting & threading the new shaft. I have a photograph, but can't figure out how to post. (???) Any help for a 'newbie' to the site would be appreciated.
BTW - close-winded sailing performance in heavy weather was greatly improved with a folding prop. Disturbed waterflow coming from the fixed prop was separating as it streamed along the rudder, resulting in loss of tiller control at high degrees of heel/speed. With the folding prop, flow is more laminar across the rudder, providing a dramatic increase in helm response at the tiller.
Forward motor thrust hasn't been noticeable, due to the already very underpowered MD6B pushing her along. Reverse is slower to engage, thrust is much lower, but once reverse movement starts I have helm control. Which has been very helpful in docking. ~Joel