9 posts in this topic

Hi, newbie here.  Just purchased my first boat, a 2017 21 H2O Ski & Fish OB.  We went with the 150HP Yamaha.  Supposed to be ready before Memorial weekend (I hope!).  It comes with a stainless steel prop.  We'll be using the boat to pull tubers/skiers, fishing, & general cruising with the family.  It will be used at our cottage on an inland lake, which has a rocky bottom.  Wondering if a switch to an aluminium prop would be a good idea?  I realize I may be sacrificing some performance, but if I run the bottom, I'd rather ruin a prop than the whole motor...  

What do you guys think??

Appreciate the advise, & can't wait for it to warm up here (Michigan)!!

Share this post


Link to post
Share on other sites

I guess its not a bad idea.  Just don't hit anything, and then its not an issueB).  Also with an OB you have the ability to trim it way up if needed. 

BTW I think that would make you the first person on here with an H2O OB.

Good luck with the wait.

Share this post


Link to post
Share on other sites

Thx for the reply.  And I think your right - I've been reading through the forums since we started down the path to owning a Chap, & I don't see many OB threads.  I think going with an OB was the right choice for us, considering the lake it'll be used in.

Share this post


Link to post
Share on other sites

I switched out the stock Volvo 3 blade 19" pitch on my '09 196 SSi with Volvo 4.3L GXi to a Turning Point aluminum 4 blade. I'm glad I did as I ended up dinging the prop on a rock after the switch.It is much cheaper to replace an aluminum $100 prop than the $300-400 stainless. The switch also got me to the higher end of my RPM range and only sacrificed a couple MPH. It tows a tube better than the 3 blade which is more of a cruising prop.

Share this post


Link to post
Share on other sites

Great info, thx for sharing.  Try as I might, I KNOW I'm going to nail the bottom at some point, & unfortunately the rocks are always going to win...

I've read a lot on 3 blade vs 4 blade props.  For pulling tubers/skiers, it may end up being what I replace the stock stainless steel prop with.

Share this post


Link to post
Share on other sites

Many years ago Mercruiser ran  DESTRUCTIVE  TESTS on the damage to the sterndrives when using a Aluminum or S S prop.   Same everything to nail down what the difference would be.

Sadly they said it made no difference to the sterndrive being damaged.  The were striking a submedged concrete wall edge. Different speeds. They said pick what you like most & enjoy it until a good prop strike occurs.

Share this post


Link to post
Share on other sites

Turning Point does make a great aluminum prop.  I had one on my old outboard fishing boat and it out performed any other prop I tried, even the ss props.  (Had better hole shot with only 1-2 mph slower top end)  I would not run a ss up north around the rocks, the aluminum is softer and more forgiving on a lower unit.  Talk to any prop shop up north and they usually recommend aluminum unless you know the area very well. 

Share this post


Link to post
Share on other sites

If you are at planning speeds ?  

PUTT  PUTTing is a different story. Dinged / bent. Very possible with non noticeable damage.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now