Boats For Sale:
3 or 4 blade prop |
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1968ccsn 
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Joined: June-06-2010 Location: Minneapolis, MN Status: Offline Points: 10 |
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 Topic: 3 or 4 blade propPosted: July-06-2010 at 3:51pm |
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Is there a BIG advantage to using a 4 blade prop?
I have read that you lose a bit on the top end, but the boat pulls out of the hole better and is easier to control. Just thought I would see if anyone has made the change. Thanks, Eric Frederick  
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horkn
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Joined: September-10-2007 Location: Cedarburg, Wi Status: Offline Points: 1511 |
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Posted: July-06-2010 at 4:00pm |
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I have a acme 13x12 4 blade on my 78. I like it a lot, been running it since 2002. It may not be as fast as a 3 blade, but it sure pulls well.
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78 martinique- refloored, reinforced, stringers re glassed, re engineered interior
GT40P heads Edelbrock Performer intake acme 4 blade http://img.photobucket.com/albums/v64/horkn/fish/nautique.jpg |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21186 |
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Posted: July-06-2010 at 4:06pm |
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No, the "4-blades are superior" mindset is 10-15 years old. Today's modern 3-blades rival the 4's in blade surface area, so they come out of the hole just as well and are usually a bit faster up top. On a lighter 16-17' boat, even the "old-school" non-CNC 3-blades like the Federals and OJ's perform very well.
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1968ccsn
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Joined: June-06-2010 Location: Minneapolis, MN Status: Offline Points: 10 |
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Posted: July-06-2010 at 4:08pm |
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The prop I want is 13/16...is that too big?
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: July-06-2010 at 4:08pm |
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hope you don't run your prop like that, I hope it's just slid on for the picture, otherwise something is majorly wrong.
The newer three blades are the way to go. the lone exception is if the majority of boat usage is for boarding with a ton of weight, then a four blade helps but can be done just as easy with the three blade too. Tell us you intended usage for the boat, cruise, ski, board or a combination of that. What are the current WOT rpm and GPS speeds. it looks like the orginal prop 13 x 13 a lot use the ACME 540 as a replacement, but it all depends. |
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1968ccsn
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Joined: June-06-2010 Location: Minneapolis, MN Status: Offline Points: 10 |
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Posted: July-06-2010 at 4:13pm |
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The pic is just to see the writing on the prop...the nut and pin are off.
I'm not a wakeboarder (bad knees), i like to ski and would like to try surfing...mostly just a fun boat... Oh, and I do like to go fast!!! |
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79nautique
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Posted: July-06-2010 at 4:17pm |
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any engine modifications? or bone stock?
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1968ccsn
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Posted: July-06-2010 at 4:21pm |
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"What are the current WOT rpm and GPS speeds"
I have NO idea what those mean...sorry guys. I'm planning on bringing the boat to the Midwest Reunion and that will be the first time on the water since I bought it on 5/1 (it has been in the shop for the last 2 months-engine/restored/updated), so maybe some of you guys can give me some ideas. |
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: July-06-2010 at 4:26pm |
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wide open throttle WOT,
do you have the cam spec's for the rebuild?, did you install an aluminum intake, use the stock heads? what updates where done? just get to GL and I'm sure there will be some extra props around to try so you know what you'll want to use. |
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1968ccsn
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Posted: July-06-2010 at 4:27pm |
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Stock 318...I think....
http://www.flickr.com/photos/45291673@N00/4564846200/in/set-72157623960156814/ http://www.flickr.com/photos/45291673@N00/4564846820/in/set-72157623960156814/ |
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1968ccsn
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Joined: June-06-2010 Location: Minneapolis, MN Status: Offline Points: 10 |
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Posted: July-06-2010 at 4:29pm |
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The motor was a just a tune up and new carb.
I KNOW you guys think I must be an idiot...I just dont know much about the details of the boat....sorry. Thanks for the help. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: July-06-2010 at 4:52pm |
Yes it would be too steep of a pitch unless there are lots of engine mods. The prop in your picture may even be too steep. It looks like it's been re pitched to 14". The WOT RPM will give you a direction to head. |
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79nautique
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Posted: July-06-2010 at 4:58pm |
I think your doing better than most newbies, worded your questions correctly, posted pictures, and replied, win, win win, and then you throw in GL what's idiotic about that? 
welcome aboard get to GL and let some of the experts help you out in selecting a prop hell you might even win one to boot, so get signed up and be there. |
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1968ccsn
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Posted: July-06-2010 at 5:26pm |
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I'm signed up for GL, mailed the check to Alison last week, need to get the hotel room and I will be ready to go.
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1968ccsn wrote: