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  1. #1
    ARNYGOLLOTT3's Avatar
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    15/20 3 Blade? When to use it?

    When does a 15/20 3 Blade benefit a setup....? I know a 3 blade 15/19 pulls harder than a 4 blade 15/20 and the 15/19 sacrifices a little on top end compared to the 4 blade 15/20...but where does the 15/20 3 blade fit in? I realize it is a bit steeper than a 3 blade 15/19...does anyone run one...tested one....? Would a 15/20 3 blade offer the more or less pull than the 15/19 or would does it add top end and sacrifice pull like a 15/20 4 blade....

    What setup would need a 15/20 3 blade....a strong 3++ looking for pull more than top end?

    This stuff is a mystery to me...teach me please!


  2. #2

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    Quote Originally Posted by ARNYGOLLOTT3 View Post
    When does a 15/20 3 Blade benefit a setup....? I know a 3 blade 15/19 pulls harder than a 4 blade 15/20 and the 15/19 sacrifices a little on top end compared to the 4 blade 15/20...but where does the 15/20 3 blade fit in? I realize it is a bit steeper than a 3 blade 15/19...does anyone run one...tested one....? Would a 15/20 3 blade offer the more or less pull than the 15/19 or would does it add top end and sacrifice pull like a 15/20 4 blade....

    What setup would need a 15/20 3 blade....a strong 3++ looking for pull more than top end?

    This stuff is a mystery to me...teach me please!
    i recently put a 14/19 4blade on and i was suprised out of the hole i was on the rev limmiter, but top speed was faster than the 15/19 3 blade, i've just got another 15/19 3 blade off jerry, so i'm not going to bend it to reduce the rpm but put smaller rings in to see

  3. #3
    shhr's Avatar
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    good question I had to send my 15/19 3 blade to Jerry for a little more pitch, I have a 15/20 4 blade that I need to send to him also for a better comparison, I really like my 3 blade it pulls hard all the way to top

    I would love the try a 15/20 3 blade I just hate to spend 300 and it not gain anything if someone has one I will be glad to test it for free of course

  4. #4
    REID2168's Avatar
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    in my PERSONAL opinion a stage 3+ RUDE charger set up will benefit top end speeds from the 15/20R and maintain higher RPM's in my case i cannot tell the difference between accelleration of the 15/19R maybe i need to retest but if u get your boat running like i feel my boat does! ITS OVER! 15/20R and your gone! this of coarse in combo with a stage 3+ setup! i think if i had a REG stage 3 either S3 or Rotax set up i would run the 15/19R to get the RPM's with the 81mm venturi nozzle! just my opinion! i feel it takes the Rude to pull the HIGHER RPM WITHOUT touching the prop blades on the 15/20R with the 81mm ring! maybe im wrong just how i feel and my boat ROCKS! good luck!

  5. #5

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    Quote Originally Posted by ARNYGOLLOTT3 View Post
    When does a 15/20 3 Blade benefit a setup....? I know a 3 blade 15/19 pulls harder than a 4 blade 15/20 and the 15/19 sacrifices a little on top end compared to the 4 blade 15/20...but where does the 15/20 3 blade fit in? I realize it is a bit steeper than a 3 blade 15/19...does anyone run one...tested one....? Would a 15/20 3 blade offer the more or less pull than the 15/19 or would does it add top end and sacrifice pull like a 15/20 4 blade....

    What setup would need a 15/20 3 blade....a strong 3++ looking for pull more than top end?

    This stuff is a mystery to me...teach me please!
    To pull a 15-20 3-blade you need ALL the Hp you can buy. Cam ,porting B-C kit/turbo. S-3 isn't close.

  6. #6
    ARNYGOLLOTT3's Avatar
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    I understand that a 15/20 3 blade requires more than a Riva Stage 3...but if you can spin one, what does a 3 blade offer over a 4 blade...?

    Maybe a Stage 3 plus Rude Supercharger and Cam might be able to spin one...?

    What does a 15/20 three blade offer in comparison to a 15/20 four blade if they were set to spin at the same rpm?

  7. #7
    rxpdoo's Avatar
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    15-20

    if you spin the 20 at the same rpm you should see a 1-2 mph difference.

  8. #8
    REID2168's Avatar
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    if you spin the 20 at the same rpm you should see a 1-2 mph difference.Today 02:50 AM
    PERIOD!!!!!!!!!!!!!!!!

  9. #9
    HORSEPOWER JUNKIE 9secZO6's Avatar
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    Quote Originally Posted by ARNYGOLLOTT3 View Post
    I understand that a 15/20 3 blade requires more than a Riva Stage 3...but if you can spin one, what does a 3 blade offer over a 4 blade...?

    Maybe a Stage 3 plus Rude Supercharger and Cam might be able to spin one...?

    What does a 15/20 three blade offer in comparison to a 15/20 four blade if they were set to spin at the same rpm?
    Can u spin an un-touched 15/20 4 blade to 8600 now?

  10. #10
    ARNYGOLLOTT3's Avatar
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    No...just tinkering with options...ideas...and theories...and I just want to learn!

    I still have setup in my signature, 8100,... but I plan to go Riva Ecu with Rude S/C and Cam within next week or two...sold the CJ got some cash now!

    If I could spin the 15/20 3 Blade at 8500 rpm....would I be faster than a 4 blade 15/20 at 8500 rpm?

    I will be running my untouched 4 blade 15/20 when I do go to the stage 3++ setup....IF I can spin it to 8500+ pretty easliy, big IF there....I might try a 3 blade for fun and learning...but would like/appreciate others info/results that have run these 15/20 3 blades...

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