Tack
Hello Mark, You can very easily switch to a three blade. The three blade, if set correctly, will not produce any more load then its two blade counterpart. The three blade will however increase your motoring efficiency by apx. 30%. This will allow the boat to motor slightly higher and help it to maintain the boat speed when confronted with adverse conditions. Your 82 vintage vessel was a change year for Oday so you vessel may not have the same prop install when comparied to sister ships. 1982 and older use 15 x 9 three blade 1982 and newer a 15 x 8. You will need to let me know what your current two blade is we can cross ref. it over to the three blade for you. I went to Westerbeke’s web site and I could not find a page, which would allow me to see the info need to determine the tack requirements. I would have to assume that you will need to go through a Westerbeke dealer to acquire one and not an autoparts store. Installation should be very straightforward. I know that in the case of my Yanmar, it was very easy for me to replace. Westerbekes web address is http://www.westerbeke.com/ Good luck. Kevin
