Props

[stamfordian]

Just got back from the east coast ,around Blakney harbour ,noticed that all the outboard motor users had metal props fitted.Bieng relativly new to motor boats bear with me when i ask this question:My outboard is currently fitted with a"plastic" prop.Is this ok to use on coastal waters or would anyone anybody reccommend changing it for a "metal" one.What if anything is the difference?.
p.s.... couldn,t resit getting on a boat.... nice Seals!!!.

 

[longjohnsilver]

Platic props normally used on small engines, 2 - 3hp. Anything over that would usually have a alloy or stainless prop, but I think someone manufactures larger plastic ones on a get you home basis.

 

[stamfordian]

oppps,this ones on a 50hp evinrude.anybody know good place to get an alloy prop for it.

 

[DavidJ]

How many hp are we talking here.
Plastic props will deflect under load so will become inefficient . OK for upto 10hp is my guess
David

 

[rich]

hang on a mo, there are plastic props on the market these days for all size engines.

rich

 

[longjohnsilver]

Think you're right Rich but I also suspect these are for emergency use, if you dinged it, presume blade would snap off rather than just bend.

 

[paulrossall]

Don't know the answer to your question but if you ring Lincolnshire Marine Engines on 01522 868107 they will advise you. Tell them what you have got, boat size, what you use it for. They are Evinrude main dealers and are very helpfull. I have had 6 different engines serviced there over 14 years and know I am dealing with experts who do not attempt to rip you off. I have no connection with them at all.

 

[rich]

me thinks plastic , bend, metal snap.

rich

 

[longjohnsilver]

Got to be t'other way round. If lots of horse power then bendy plastic no good, change pitch to nothing and then no power!

 

[rich]

good night,,,,,

rich

 

[SeaAce]

Is it plastic or a composite material? Composites are made by a number of manufacturers now and can give better performance than aluminium. They have the advantage that they flex more when hitting obstacles and if they snap you can replace the blades (at sea if you carry spares). They are less likely to cause damage to the transmission when hitting obstacles.
Makes that come to mind are "Piranha" (American) and "ProPulse" (Swedish).