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 Post subject: Help selecting new Prop
PostPosted: Fri Nov 04, 2016 8:54 am 
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Guppy

Joined: Fri Nov 04, 2016 8:43 am
Posts: 6
Hello all,

New to the site and am looking forward to getting a lot of useful tips and sharing my knowledge in the boating world. Last winter we purchased a new 2014 H190SS (a boat with a lot of options that people got sticker shock from and didn't know how to properly negotiate) and it has brought a new level of enjoyment to our family cottage. We found that we do a lot of tubing, waterskiing and wakeboarding along with morning/evening cruises with the entire family. At the moment everything is stock however, I wanted to gain perspective on which prop is right for us. Currently we have the stock 3 blade and am wondering if swapping to a stainless 4 blade be better for our type of boating. We also have the 5.0L merc if that makes a difference in the choices.

Looking forward to your input. Thanks.

_________________
Current
2014 H190SS 5.0L Merc
19?? 16ft Tin Tippy 20hp Merc

Past
2003 Seadoo GTX 185hp
1996 Seadoo GTX 110hp


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PostPosted: Fri Nov 04, 2016 9:10 am 
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268 Vista

Joined: Tue May 16, 2006 9:49 am
Posts: 4989
Location: West Michigan
Zchamp wrote:
am wondering if swapping to a stainless 4 blade be better for our type of boating. We also have the 5.0L merc if that makes a difference in the choices.

Looking forward to your input. Thanks.


You will get better holeshot and bite in turns with a 4 blade. We did the same on our 20' boat with 5.0L Merc power.
Here are two choices that will work great.

Michigan Wheel Vortex 992204 14 x 20p 4 blade Aluminum
Michigan Wheel Ballistic 933521 14.375 x 21p 4 blade Stainless Steel Performance prop

You will lose a hundred or so RPM, and maybe 1-2 mph at WOT switching to a 4 blade.

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One of 4 Previous (Sold) Boats:
2000 Four Winns 268 Vista
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Current Boat: 2004 Chaparral 235 ssi cuddy
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PostPosted: Fri Nov 04, 2016 10:35 am 
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Guppy

Joined: Fri Nov 04, 2016 8:43 am
Posts: 6
Thanks for the info. Better holeshot would be awesome as this is what we lack at the moment with a full boat. Losing some RPM along with 2mph is no big deal. Have only ran at WOT a couple times; usually in the morning when the lake is glass to see how fast we can go or when I am late to pick somebody up at the marina. I am going to do a little more research to better understand the differences in pitch.

_________________
Current
2014 H190SS 5.0L Merc
19?? 16ft Tin Tippy 20hp Merc

Past
2003 Seadoo GTX 185hp
1996 Seadoo GTX 110hp


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PostPosted: Sat Nov 05, 2016 9:33 pm 
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email admin your custom rank

Joined: Sun May 20, 2012 4:31 pm
Posts: 873
Location: Minneapolis, MN
If you are staying with the same make amd model of prop, general guidelines are that 1 less inch of pitch will increase max RPM by 150-200 RPM. 2 inches is usually 300-400 RPM. This will help with hole shot, but may cause the engine to exceed redline at top end. Some of the newer electronically controlled engines may have a Rev Limiter that keeps the engine from over revving. Adding a blade (3 blade to 4 blade) with the same pitch will usually cause a 100-200 rpm reduction. This is a rough estimate because most prop makers do not have the exact same model in 3 blade and 4 blade. Some boat manufacturers and owners have reduced the diameter by 1/4 to 1/2inch when going from a 3 blade to a 4 or 5 blade prop. More blades means more blade surface area and harder to turn up to full RPM. For this reason some 4 and 5 blade props actually have blades with slightly smaller surface area per blade than 3 blade props. There are many other factors that can affect prop and boat performance, including blade cupping, blade rake angle, vent holes, etc.

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Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.

Current boat: '02 FW 268 Vista
Previous boat: '95 FW 190 Horizon


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