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Old 10 October 2015, 10:03   #11
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Matt, if you get the chance, try a Mercury Rev4 prop. Drop an inch off the pitch from your normal 3 blader.


.....sh1t happens.......
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Old 10 October 2015, 13:45   #12
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Country: Poland
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Make: HIGHFIELD OM540DL
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EVINRUDE dealer from Chania (Greece, Krete Island) has advised me to try EVIN REBEL 19".

I have good experience with 4 blades also. My spare is Korean ALU 4 blade:

14x20



The same top speed than VIPER, not so perfect acceleration and go to plane like VIPER but better fuel consumption on 3800 - 4200 RPM. Everything with Family on board (5 persons).

Full load (9 persons) - VIPER does better (speed and fuel economy)

I think that I have maximum possible engine for this boat. 115 HO is downgrade 135 if I remember. So my set accept even so big props without any problem.

Now I have problem - which one test next ? Merc Rev4 or REBEL 15 1/4 x 19"
Some dealer told me that REBEL is for V6 only but the same has been mentioned about VIPER 14 3/4 x 19.

115 HO has bigger gear-case than normal 115 I think.
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Old 11 October 2015, 03:00   #13
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Why are you changing the prop...? 69kph from with your rib/engine combination seems fine. What are you RPMs at full 69kph ?
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Old 11 October 2015, 03:53   #14
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Country: Poland
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I'm happy about top speed and performance.
Someone told me that maybe on REBEL I will have better fuel economy and the same performance. Now it is 1.8-2 km per liter.
I'm only curious.
I'm aware of "do not correct things if they works fine ..." also
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Old 11 October 2015, 04:43   #15
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Quote:
Originally Posted by MatFromPoland View Post
Now it is 1.8-2 km per liter.

I'm aware of "do not correct things if they works fine ..." also
That's good fuel consumption as well. What RPM are you getting at full speed ?
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Old 11 October 2015, 05:43   #16
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4 blade props are generally thirstier than 3 bladers. If you are looking for economy, stick to the 3 blade prop. A 4 blader will give better handling in the rough & can run higher.


.....sh1t happens.......
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Old 11 October 2015, 09:43   #17
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Country: Poland
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5600 RPM I suppose.
Boat reach 69 km/h really fast.

Person who set-up boat in Poland want to lift engine up.
It is deep V boat and now anti-ventilation plate is on the same surface than keel. Manual states that:

Quote:
conventional v-hulls often perform well with the anti-ventilation plate approx. 1 in above the bottom of the hull


The question is "is my RIB conventional V-hull"
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Old 11 October 2015, 10:38   #18
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The anti vent plate should skim the top of the water when you are planing and trimmed out. If it is under water then it is too low and should be raised.

5600 RPM is good.
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Old 11 October 2015, 14:50   #19
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Country: Poland
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We will raise it next year and check results. He prepared transom for such need when set-up engine. There is -5 C around my house every morning since more than week.

So boat went to winter sleep:


I did WINTERIZATION and get out batteries.
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Old 13 October 2015, 18:26   #20
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Quote:
Originally Posted by MatFromPoland View Post
WOW !!! Fantastic results. 2T rules

What prop do you use ?

Technically/theoretically speaking mine VIPER 19" can not go faster than 72 km/h (gear ratio is 2,28; RPM is 5600 so as results this PROP can not give more at this RPM than 72. So 69 km/h is really good results - slip is between 5-3%.

Someone told me that VIPER blades are curved and as a results you can count this prop as more than 20" prop really.

Of course different prop you will select for race on flat lake, different for real Sea conditions.
I'm using a Turning Point Hustler 13.25" x 17" three blade Prop.
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