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04cummins

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Posts: 21
Reply with quote  #1 
Hello guys, recently picked up a ranger rt 188 with the etec on it. came with an aluminum 13.2x19p prop. at wot would get 5k rpm. got a 17p prop and could get 5400 rpm. 5500 if I trimmed it more but starts to porpoise pretty good. when I had the 19p prop I could hit 48 with that and 44 or so with the 17p prop. the motor is on the third hole from top. I moved it to last hole and tried it out with the 17p and didn't gain any speed or rpm. when trying to get more trim it sounded like the prop was skimming the surface of the water. I lowered it back down one hole. do I need to go with a 15p prop? on another forum guys with the 115 proxs are running a 21 or 22p stainless prop on same boat. I cant even turn the 17p aluminum to the optimum rpm range. I eventually would like to get a stainless prop. was looking into a viper but the lowest pitch I see was an 18 and im not sure if that would work well for me. all my test were done atleast half a bag of gas, boat has 3 batteries in the back with a light load of tackle up front. if anyone has some input that would be greatly appreciated.
ChrisAG

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Posts: 135
Reply with quote  #2 
Hi, you can't compare propeller pitch with different makes because they might have different gear ratios in the lower unit. The Viper comes in a 17" pitch for the V4.

I'm sure others will have better advice though on what specific prop you can try. I have a 17" Rogue that is a bit quicker than the aluminum. It's a nice prop, especially for rough seas, but I don't like it on my bowrider. I'll probably put it up for sale.

For my own experience, I have a 17" aluminum that only gives me 5500 rpm at 44 mph. I take the nieces water skiing and need to get the revs up so I'm going to try getting the 17" re-pitched to 16" (from what I've read, the 15" BRP aluminum is apparently more than 2" pitch difference from the 17" and would take the rpm too high).
04cummins

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Posts: 21
Reply with quote  #3 
thanks for the info, I just don't want to have to buy different props to try. I am going to try the 15p brp next week so ill see how that goes.
04cummins

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Posts: 21
Reply with quote  #4 
I did make a typo on first post. meant a raker not a viper but maybe a viper would be a good alternative.
Huey

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Posts: 13,574
Reply with quote  #5 
Hi, as said comparing one outboard vs another outboard even on the same model boat will be hard and I always see people claim they get more performance than in reality they do. The simple facts are the V4 when set-up and propped right will outperform the 3 cylinder OPTI and I bet you are too low in the water, hole no.3 or 4 is where it should be rigged and then fitting something like a Viper or even Raker will transform that boat compared to a basic alloy prop once the height is right and the rigging, like control cable adjustments are confirmed as correct.

Cheers,

Huey.
04cummins

Registered:
Posts: 21
Reply with quote  #6 
right now it is mounted in hole 3. I raised it to hole 4 the other day and tested it, with a little too much trim it sounded like the prop was hitting the water surface, is that what cavitating sounds like? . performance wasn't the greatest. however when cruising and in good trim it would turn left or right pretty quickly. next week I should receive the 15p brp prop to try and that should get my rpms up I think.
thanks for the reply guys. 
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