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  1. #1
    is thinking. grantuk's Avatar
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    Is there a 15/19 & and a 15/19R???

    Are these 2 different props?

    Skat 15/19
    Riva/Skat 15/19R

    What are the differences?

    I have noticed that some props have the pitch numbers on the outside of the prop between the blades but mine has 15/19 (not R) scribed into the inside of the hub where the thread is.

    Thanks,

    Grant


  2. #2

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    I think the R means it was put on a pitch-block to re-check the pitch before they send it out.
    Last edited by N8T; 03-03-2008 at 05:03 AM. Reason: spelling

  3. #3
    ou812's Avatar
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    The R prop is a Riva pitched prop designed to use with their stage 3 setup. A 15/19 is little taller than a 15/19R.
    Last edited by ou812; 03-03-2008 at 05:24 AM.

  4. #4
    is thinking. grantuk's Avatar
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    Really?

    I tested my ski this weekend with rude charger, RR IC, stock ECU etc and it was on the limiter at about 3/4 throttle, I though this prop would be shorter than the R.

    Which prop is considered better out of the 2 for my set-up (will have RR ECU etc)

    Thanks

  5. #5
    Site Admin Green Hulk's Avatar
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    The R props are better. They are pitch blocked and checked for accuracy. With the non R props i have meausured the blades and they are all over the place.

    Same goes for 15/20R and non R props.

  6. #6
    Moderator The Bandit's Avatar
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    The Skat 15/19r also is lighter than the standard 15/19. if you compare the two on the back side, you will see the difference.

  7. #7
    is thinking. grantuk's Avatar
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    So if I take my 15/19 (non R) to a prop shop and have them check the pitch for accuarcy and add 3mm to the trialing edge I should be OK?

  8. #8
    REID2168's Avatar
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    there may be accuracy differences in the props trailing edges from the get go but that can be fixed what cant be is the REAL differences..........the 15/19R & 15/20R are cast lighter with less MATERIAL BEHIND THE NOSE PORTION OF THE PROPS than the regular 15/19 & 15/20 these BLADES are drilled behind the nose to be made lighter..........the R props are cast WITHOUT the extra weight in them..hence they should spin more accurately and be balanced better from the get go and maybe rev faster........when u drill to loose weight u have to be somewhat precise and make sure u dont set it off balance.........hence the R props should be more balanced .........just my observation of the two........ as i have had BOTH!
    Last edited by REID2168; 03-03-2008 at 10:53 AM.

  9. #9
    Moderator The Bandit's Avatar
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    Quote Originally Posted by REID2168 View Post
    there may be accuracy differences in the props trailing edges from the get go but that can be fixed what cant be is the REAL differences..........the 15/19R & 15/20R are cast lighter with less MATERIAL BEHIND THE NOSE PORTION OF THE PROPS than the regular 15/19 & 15/20 these BLADES are drilled behind the nose to be made lighter..........the R props are cast WITHOUT the extra weight in them..hence they should spin more accurately and be balanced better from the get go and maybe rev faster........when u drill to loose weight u have to be somewhat precise and make sure u dont set it off balance.........hence the R props should be more balanced .........just my observation of the two........ as i have had BOTH!
    Zackly...

  10. #10
    EZ Dock of Long Island Shibby1485's Avatar
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    the whole weight thing is kind of inaccurate i believe... maybe in the very beginning, but not so much in the past year at least..

    skat 3-blade ultra-lite..

    well here's a "demonstration" if u will that was passed along the vine to me at the time of the "R" prop introduction

    weights/mass not different

    and yes the skat prop had more pitch in it


    check this pdf file
    Attached Files Attached Files

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