On my Sun Odyssey 32, (2002) The fixed 2 blade prop is not good in astern. I am thinking of replacement with a feathering prop such as J Prop or Max Prop. Any recomendations on size/make etc would be much appreciated. She has a Yanmar 2GM. Reg.
once you have measured shaft diameter and propeller available space from shaft to underside of the hull (allow 10% clearance between blade tip and hull), propeller size should be easily determined, as pitch can be adjusted when actually fitted to the boat.
As for prop walk in astern, imho it depends mostly on hull shape, a better propeller giving a marginal contribution. i.e., one of my boats with a fixed propeller had a small tendency to walk to port when in astern (meaning I had to let the boat bow dip by 10 degrees to port in order to have the boat steer straight in astern in the desired direction), when I fitted a 2-blade max prop the boat began behaving perfectly, no prop walk at all. On my actual sun legende I have a 2-blade max prop too, but I have to dip the bow 20/30 degrees to have the boat steer straight in astern; this imho means that a max prop (haven t tried other make) surely gives better steering in astern, but other factors (skeg, shaft inclination, hull underbody shape etc) seem more relevant to the boat behaviour, the propeller by itself does not count for 100% of the propwalk
Rob. Thanks for the info. I understand about the prop walk. I am more interested in the ability to go astern at a reasonable rate from stopped. My existing 2 blade fixed prop is very poor here. I am now looking at a Kiwiprop. (Feathering prop made in New Zealand. ) From their brochure it seems to fit the bill. I wonder if anyone has any direct experience of this prop. It's a lot cheaper than Max Prop or Jprop. Reg.
I have a maxprop on my Arcadia, 30' LOA. A bit smaller wt specs etc as an SO32, but not much. I am not sure of the prop size, as It came with the boat when I bought her last May. But reverse is very good for 'get up and go' with a 15HP Y2GM. I personally do not notice a lot of prop wash, but do get some here and there. Being as I moore in a marina at the outlet of a river, it is hard to say what is river current or tide inflow sometimes.