hurricane planing problems

studavis

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Joined
Apr 26, 2006
Messages
3
A few months ago, I purchased a 2004 Hurricane 19 ft deck boat with a 115 HP Yamaha. With the factory aluminum 13 1/4x17 prop - a little beat-up - the boat would not plane with more than 4 passengers. With a new SS Rapture 13 1/4 x 17 prop, it is better, but passengers must step to the bow to get on plane. The SS Rapture prop revs to about 5800 max. Would a 13 1/4 x 15 prop help? What brand/type. Would the 15 likely over rev? Any other suggestions? I suspect this very heavy boat is simply underpowered.
 

Ron G

Commander
Joined
Apr 28, 2005
Messages
2,905
Re: hurricane planing problems

Welcome aboard Studavis,seeems you maybe a little under powered there.I dont know what the max rpms on the 115 is but if you drop to 15p it'll put a little over 6000 which is probably to much for a yammy.is the rapture a 4 blade?and i cant beleive im going to say this but have you tried a doel fin?(hydro foil)
 

studlymandingo

Commander
Joined
Mar 22, 2006
Messages
2,716
Re: hurricane planing problems

The Smart Tabs will help you get on plane quite a bit better. Are the vent plugs out of the Rapture? This may also improve the holeshot. From your RPM posting, sounds like you have the right prop, you just need to get over the hump.
 

studavis

Recruit
Joined
Apr 26, 2006
Messages
3
Re: hurricane planing problems

Thanks for the advice!. I will try the doel fin - doesn't cost much. I don't understand the vent plug question. What are they - how do I check for them. I just opened the box and installed the prop....
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,797
Re: hurricane planing problems

Jumping in here. Some high performance SS props have a hole in the side of the prop near the front just under the blade. Purpose is to deliberately introduce air (actually exhaust gas) across the blade to force cavitation (of the prop) coming out of "the hole". <br /><br />This allows the engine to rev up and since rpm's are a key element of horsepower, it helps your engine develop it's hp and get you up and going....works I'm hear to tell you. <br /><br />Once you are up, the force of the water blowing past the prop effectively seals off the hole and the prop acts like there is no hole. When she seals up and kicks in, you can feel and hear the engine down shift; like a car going into overdrive; real cool I love(d) it.....don't currently have one but did.<br /><br />Haven't seen them, but plugs mentioned are probably just that....something to plug the holes (one per blade) and not allow it to vent as mentioned. If that is what you have, pull/push them out. Will be glad you did.<br /><br />Mark
 

studlymandingo

Commander
Joined
Mar 22, 2006
Messages
2,716
Re: hurricane planing problems

I think the vent holes are standard fare on the Rapture. Look towards the bow end of the prop, just behind where it comes out of the lower unit. You should see 3 silicone plugs in small holes just in front of each blade. They can easily be pushed on through to vent the prop.
 
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