Plastic Props

[Andy]

I've seen ads for so-called computerized props made of "composite" plastics designed especially for Yanmar 2GMF20 engines. They are touted as being "more efficient" under sail as well as under power. I have a 1988 Hunter 30 with this engine, and I am not having a particular problem, but I am always interested in improving performance. So, I wonder, to what extent would my boat's performance be improved by a prop which is not necessarily designed for my boat, but for my engine? What are the pros and cons of the "composite" material props? Thank you.

 

[Steve Dion]

Been using one for 2 years.

Andy:I have been using one for about 2 years now. I was sort of difficult to compare because the stock prop on our H'31 was over-propped. It was 15 x 12 and should have been more like 15 x 9/10. The new prop was closer but still not exact.It has worked OKAY but I would not say that it was any thing special. If you are looking for a new prop because you need to replace the old one, I'd say give it a try.

 

[Kevin l. Woody]

Comp Prop

Dear Andy,Thank you for your note. I have seen the CDI prop at shows and I have spoken to Joe, the props founder, and I my self would find it difficult to ever make some of the claims which I believe the company makes about the prop. I have no problems in using composite in propellers and believe that future propellers will start popping up as the method of manufacturing begins to come down in cost. I do not, however, believe the claims of less drag and greater speeds. If increases were present I would believe that they would be small. I hope this helps. Kevin.

 

[Steve Dion]

Andy

Andy:I think Kevin is correct in his assessment of the composite props. Pretty much what decided too.