Cazzy

Prop advice?

12 posts in this topic

I have a 2013 Chaparral 196ssi 4.3(200) with a OEM VP 3 blade stainless prop 14 3/4 x 19. It is what came on the boat new. My rpm WOT is 4200-4300. I want to buy an aluminum prop but not sure what to get. 4 blade? 3 blade? Pitch? 

The boat is up on plane quickly but 45mph max and thought it might be a little faster. I pull a tube once in a while but rare. Any suggestions or tech advice here?

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with that boat and engine not sure your going to see a real big improvement either way and would probably only look at a different prop if the one you had was broke.  Either way you would need to go down in pitch for more speed, but you would lose some hole shot.  4  blades tend to be better as well.

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The WOT RPM range for your Merc 4.3 is 4400 to 4800 RPM. If the motor is running properly, then you are overpropped, which "lugs" the engine, and will damage the engine over time  

First question, is has the boat always run at the same speed and RPM's? Is the bottom clean? What elevation are you at?

Assuming all is well with the boat, you need to drop 2 inches in pitch. Your RPM's  will increase, speed will stay about the same. 

For best performance, you need to drop 2 inches in pitch.

brick

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Thanks brick. I may try to borrow a 17p stainless to see what happens to the rpm's. Any suggestions on what pitch for an aluminum 3 or 4 blade both?

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15 minutes ago, Cazzy said:

Thanks brick. I may try to borrow a 17p stainless to see what happens to the rpm's. Any suggestions on what pitch for an aluminum 3 or 4 blade both?

From your numbers, you will need a 17 inch pitch. But remember that different props with the same pitch will give different performance.

See if you can find a shop that allows you to try a prop, and switch it if required. 

brick

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Rule of the thumb: if you have 3 blade aluminum prop which gives you correct WOT RPM, going to stainless steel reduce pitch to 2 inches, going to 4 blades reduces pitch to 2 inches.

 I switched from 21p aluminum 3 blade to 17p ss 4 blade.

My advise - don't go to aluminum.

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Thanks Leonid,

i just talk to westMichiganprops and I explained I really just want a spare prop but explained my current 3 blade 14 3/4 x 19 stainless. They said:

stick with the 19p on the aluminum also. Design wise, the aluminum and stainless volvos are the exact same prop. and performance wise, (alum vs steel of the same prop) its negligible at best.   ???

 

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I have a 2012 196SSI with the 4.3L GXi.  I just switched from the OEM 3 blade stainless 19 pitch (4500 RPM WOT with normal load) to a Solas 4 blade stainless 17 pitch.  The boat does not go any faster but it is much more responsive to the throttle and it turns much more sharply without ventilation.  I was looking for better hole shot and better hold at watersports speeds.

 

John

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14 hours ago, #%^$&%$IHateThat said:

I have a 2012 196SSI with the 4.3L GXi.  I just switched from the OEM 3 blade stainless 19 pitch (4500 RPM WOT with normal load) to a Solas 4 blade stainless 17 pitch.  The boat does not go any faster but it is much more responsive to the throttle and it turns much more sharply without ventilation.  I was looking for better hole shot and better hold at watersports speeds.

 

John

Which model Solas?  HR Titan?

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