Need some prop advice please?

[85Sunbird]

I currently have a 1985 Sunbird open bow and a 115 evinrude on it. I'm currently running an OMC SST 19" prop on it now turning 5400 rpm's wot and at 47-48 mph. I've been told I needed more bow lift in order for me to gain anymore speed. I was told a Raker prop would be a good choice for me. I've noticed that rakers only come in even numbers like 18" and 20". My question is.....based on what I'm turning now with my SST, do I need a 18" raker or a 20" pitch? I'm trying to get this boat to break the 50 mph barrier. I've played with engine heights and I'm to the max right now.<br /><br />Thanks:<br />Jason

 

[sloopy]

Re: Need some prop advice please?

48mph with 115 hp evinrude and a stainless prop is really good, almost to good. I wouldn't worry about going any faster.

 

[Jdeagro]

Re: Need some prop advice please?

What are the other handling characteristics at WOT. Any Porpoising, Chine Walking?

 

[85Sunbird]

Re: Need some prop advice please?

LOL at Sloopy...I know, but theres always that quest for more speed.<br /><br />NautiJohn,<br />The boat handles smooth as silj right now..no chine walk and no porpoising at all. I had a friend who had a boat just like mine years ago and had a 115 mercury on it and he would run 65+ easy. He said his started to walk alittle astarting around 60 mph.<br /><br />Thanks:<br />Jason

 

[mrtool2u]

Re: Need some prop advice please?

65 with a 115,can I have some of what you been drinking.Are you sure that his motor was not a wolf in sheeps clothing.I have a 120 Johnny on a 19 foot alum. boat,and I just want to break 45.I have a new Ballistic that I just got,and a Rapture on the way,if you can wait till next week I can post my results with these particular props.The way I figure it,,info on any prop is good to know.

 

[Hooty]

Re: Need some prop advice please?

Go with the 18"p and get the revs up. You might even try a 16"p. 6000rpm won't hurt a thing.<br /><br />c/6<br />Hooty

 

[LubeDude]

Re: Need some prop advice please?

Originally posted by 85Sunbird:<br /> LOL at Sloopy...I know, but theres always that quest for more speed.<br /><br />NautiJohn,<br />The boat handles smooth as silj right now..no chine walk and no porpoising at all. I had a friend who had a boat just like mine years ago and had a 115 mercury on it and he would run 65+ easy. He said his started to walk alittle astarting around 60 mph.<br /><br />Thanks:<br />Jason

Ha, Ha, Ha, Ha, Ha, Ha, Ha, Ha, Those were the days before GPSs.<br />----------------------<br />

 

[Mercathode]

Re: Need some prop advice please?

If your going to go for top speed with a light load I would opt for the 20" if you want more whole shot and carry a few passengers you may go the 18. You may however be at the top of the 115's game!<br />LW

 

[85Sunbird]

Re: Need some prop advice please?

Ok guys......The 65 with a 115 is true as it gets. keep in mind...this 115 was a mercury which was rated at the prop. That motor was proablly close to a 150 like mine. He had it worked over and was turning it 6500+. He poped a few motors in the process too. <br /><br />Jason

 

[LubeDude]

Re: Need some prop advice please?

How long is this boat?<br />---------------------<br />

 

[Hooty]

Re: Need some prop advice please?

Your friend's 115 Merc wuz hp rated at the flywheel.<br /><br />c/6<br />Hooty

 

[85Sunbird]

Re: Need some prop advice please?

Lubedude,<br />It's a 17' sunbird (open bow).<br /><br />Jason