Need help with prop pitch (stiletto)

[merc150]

Hey guys!!
I have a 1994 19ft hydra sports flats boat with a 2003 mercury 150 carb motor. The boat is heavy and has many ad ons such as polling platform, front fishing platform, trolling motor, power pole and 4 livewells, 50 gallon gas tank, and i usually 3 people on the boat. Im trying to figure out which stiletto advantage prop to get its either the 17 p or the 15p (need bow lift thats why I have a stilletto) my original prop was a vengeance 17P and i got 5600 rpm @WOT (rpm the merc recommends) I switched to a 21p stilletto and only turned 4900 rpms @WOT then I bought a 19p stiletto and im only running about 5000 rpms @WOT. Im thinking 15p might put the rpms close to where they should be. Also ive tried raising and lower the motor on the transom. I have the cav plate 1 inch above the bottom of the hull (seems to work the best for this style boat). I have noticed with the vengeance prop the motor is a lot quieter through all of the rpm range and the stilletto. I understand that the motor is probably lugging do to not reaching full rpms. Back to the pitch what do you guys think? THANKS FOR THE HELP!!!

 

[merc150]

Re: Need help with prop pitch (stiletto)

Hey guys!!
I have a 1994 19ft hydra sports flats boat with a 2003 mercury 150 carb motor. The boat is heavy and has many ad ons such as polling platform, front fishing platform, trolling motor, power pole and 4 livewells, 50 gallon gas tank, and i usually 3 people on the boat. Im trying to figure out which stiletto advantage prop to get its either the 17 p or the 15p (need bow lift thats why I have a stilletto) my original prop was a vengeance 17P and i got 5600 rpm @WOT (rpm the merc recommends) I switched to a 21p stilletto and only turned 4900 rpms @WOT then I bought a 19p stiletto and im only running about 5000 rpms @WOT. Im thinking 15p might put the rpms close to where they should be. Also ive tried raising and lower the motor on the transom. I have the cav plate 1 inch above the bottom of the hull (seems to work the best for this style boat). I have noticed with the vengeance prop the motor is a lot quieter through all of the rpm range and the stilletto. I understand that the motor is probably lugging do to not reaching full rpms. Back to the pitch what do you guys think? THANKS FOR THE HELP!!!

anyone??:facepalm:

 

[Chris1956]

Re: Need help with prop pitch (stiletto)

The RPMs you got when switching to the 21P and then the 19P props do not correlate. 5600 RPM with the 17P should have been 4800 with the 21P and 5200 with the 19P props. Since your numbers were different than what is usually seen, it is tricky to give advice. I think you need the 17P Stilletto. See if you can make a deal to try it out. If it is too tall, trade it for the 15P.

Best I can do....

 

[Tail_Gunner]

Re: Need help with prop pitch (stiletto)

http://forums.iboats.com/prop-questions-topics/ss-prop-643000.html

Use the baypro in that thread..lots of lift..Where's Dhadley this is his game.

 

[jestor68]

Re: Need help with prop pitch (stiletto)

You went from a "standard" type prop to a more aggressive type prop; that's why your results are all over the place.

Mercury motors run best with Mercury props.

Not being a Stilletto fan, I'll give you a recommendation on a Mercury prop if interested.

 

[merc150]

Re: Need help with prop pitch (stiletto)

You went from a "standard" type prop to a more aggressive type prop; that's why your results are all over the place.

Mercury motors run best with Mercury props.

Not being a Stilletto fan, I'll give you a recommendation on a Mercury prop if interested.

I was looking at the mercury tempest props for bow lift but there a bit pricey. Maybe I can find one used

 

[merc150]

Re: Need help with prop pitch (stiletto)

Thanks for the advice!! Ill also take a look at the baypro

 

[krakatoa]

Re: Need help with prop pitch (stiletto)

You went from a "standard" type prop to a more aggressive type prop; that's why your results are all over the place.

Mercury motors run best with Mercury props.

Not being a Stilletto fan, I'll give you a recommendation on a Mercury prop if interested.

Really?

so a nike shoe will fit better with a nike sock!:lol::lol::lol:

 

[jestor68]

Re: Need help with prop pitch (stiletto)

Really?

so a nike shoe will fit better with a nike sock!:lol::lol::lol:

Yes; really; concerning the prop that is.

I don't know enough about Nike shoes to comment on that subject.

 

[Chris1956]

Re: Need help with prop pitch (stiletto)

Gee, I ran a Rapture on my speedboat. That was a real good prop. I now run a Turning Point Hustler. That is a good one too.

 

[Chris1956]

Re: Need help with prop pitch (stiletto)

BTW - Boat has a Merc V6 motor.

 

[krakatoa]

Re: Need help with prop pitch (stiletto)

Actually I test last Sat Stiletto 13x21 on my OB Mariner 115HP 2Cycle, I found that this prop lift the bow at once, just me in the boat and takes too long to top speed no matter how I trim the OB takes tool loong to plane, also I found that the engines makes a heavy effort to turn this prop. I will go again for a 2 test. Anyway I like 13x19 and 13x17 raptute the most. The worst thing is that my tacho is dead so I cant talk about rpms

Here is my new babe

 

[jimmbo]

Re: Need help with prop pitch (stiletto)

I ran a Stilletto back around 1999, I switched to a RAKER, both were good props. I switched to an Enertia about 9 years ago. Good bow lift, a solid grip on the water, and a rocket on acceleration

 

[Tail_Gunner]

Re: Need help with prop pitch (stiletto)

I dont have the time right now but you guy's are funny

 

[Tail_Gunner]

Re: Need help with prop pitch (stiletto)

Yes; really; concerning the prop that is.

I don't know enough about Nike shoes to comment on that subject.

Jestor the children are playing pay no attention

 

[krakatoa]

Re: Need help with prop pitch (stiletto)

Jestor the children are playing pay no attention

Yes, clowns are funny too!

 

[merc150]

Re: Need help with prop pitch (stiletto)

Yes, clowns are funny too!

Ive also noticed my motor strains to get on plane with the stiletto :facepalm:

 

[jimmbo]

Re: Need help with prop pitch (stiletto)

The Stiletto is drilled. You could make the holes a bit bigger, 1/32 to 1/16 of an inch.

 

[merc150]

Re: Need help with prop pitch (stiletto)

The Stiletto is drilled. You could make the holes a bit bigger, 1/32 to 1/16 of an inch.

Ok what would I gain from making the hole bigger?

 

[jimmbo]

Re: Need help with prop pitch (stiletto)

A little less load on the engine as it's accelerating