New Prop for a Deckboat - Some Ventilation Issues

security6

Petty Officer 2nd Class
Joined
Jul 21, 2008
Messages
191
My current prop is ok, but I need to buy a spare prop. If the new prop runs better than the current one, then I would like to put the current prop on backup duty. The boat has plenty of grunt for takeoff right now and plenty of top end. I wouldn't want to lose any bottom end, but I don't mind losing some top speed.

1) Performance issue you are trying to correct.

Boat runs fine. We wakeboard alot, and it can be a little difficult to maintain proper wakeboarding speed (about 20 mph per speedo). My primary concern is ventilation. No ventilation during takeoff, but there is a decent amount of ventilation if I turn the boat hard.

2) Current prop manufacturer, model, aluminum or stainless and as a minimum.

No manufacturer listed on the prop (that I could see). It is an aluminum 3 blade prop. Based on what I've seen with how the previous owner used the boat, it could well be the factory prop.

3) Current prop diameter and pitch (required).

14 1/2 and 19

4) Wide open throttle RPM and speed with an average load (very helpful)

WOT is 49 mph (per speedo) with RPMS at 4500 or so, with just 250 lbs of passengers. If the boat is loaded up with 4 adults and 5 kids (say 1000 lbs or so), performance only drops off slightly to 47 or 48 mph and just slightly lower RPMS.

5) Engine/drive make, model, year, and HP

1999 Volvo 5.7 PEFS with a Volvo SX Cobra outdrive (1.51 ratio)

6) Boat make model, year, length and weight

2000 Larson 234 Escape (deckboat). Dry weight (per spec) is just under 4000 lbs. We usually have 45 gallons of fuel, 10 gallons of water, and probably another 100 lbs of gear, in addition to any people. I would guess that average loaded boat weight is between 4700 lbs and 5500 lbs.

Thanks for any advice on which prop might suit me best!
 

usskydvr

Chief Petty Officer
Joined
May 27, 2009
Messages
494
Re: New Prop for a Deckboat - Some Ventilation Issues

Your engine max recommended RPM is 4800-5000 so you coule use a few more RPM. I suggest you pick a 4 blade 18 or 17 pitch. Take a look at the Amita 4 by Solas
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: New Prop for a Deckboat - Some Ventilation Issues

I agree something like the Solas Amita 4 blade in an 18". Better hole shot,stay on plane with less throttle and less diddling.Smoother,better control at the dock.
 

security6

Petty Officer 2nd Class
Joined
Jul 21, 2008
Messages
191
Re: New Prop for a Deckboat - Some Ventilation Issues

One minor point - the max RPM for my motor is listed at 4400-4800 RPM.

I was leaning towards a 4-blade aluminum (I want to stay away from stainless steel) in a 18 pitch, but have also heard good things about the Turning Point Hustler 3-blade props being nearly as good as a 4 blade without giving up any top end. Any thoughts?
 

usskydvr

Chief Petty Officer
Joined
May 27, 2009
Messages
494
Re: New Prop for a Deckboat - Some Ventilation Issues

I know a lot of bass boaters (light boats, high HP) use the Hustler, but haven't heard of it being used on a deckboat.
 
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