So after doing a bunch of research here’s what I found:
Wailana – Hull #1 – has the original 16 X 10 R ( 16″ diameter X 10″ pitch right hand turning) Martec folding two blade prop that was sized to fit original engine. When the previous owner replaced the engine he didn’t replace the prop. So Mark W. is correct; it is under-propped which is why I can’t quite reach the 6/6.5 knot mark without pushing it.
Both Felxofold and Martec recommend the 16 X 12 R. The higher pitch will give a better top end speed with my Yanmar 3YM20. Gary Beck at Martec estimates 1/2 to 1 knot increase. RPM should also decrease by 200 or so.
As of 9/15, Martec wants a $975 + S&H for a new Mark III non-geared folder. They want ~$270 to refurb the old one which should get rid of the vibration but won’t help the speed issue. The recommended refurb interval is 4-10 year depending on use and abuse.
Flexofold wants $1,205 for their geared folder. Shipping included.
Anybody know what the original engine installed in the E34 was?
Hope this helps! – Greg S.