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  1. #1
    mjh3ides's Avatar
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    Doing some research on GPR specs...could use some guidance

    First Topic:
    I have a VX/GPR prop that I got from Lowell but am interested to know who machined these...was it Impros? Also, are the GPR shafts larger or smaller in diameter than the VX? The reason I'm asking is because I'd like to know if it's possible to get a VX Concord machined to fit a SHO which has a much larger shaft than the GPR.

    Second Topic:
    Anyone know what the differences in hull weight was over the production life of the GPR. I've been told that the 1300's were all the same while the 1200's were a bit heavier...if this is correct, how much is the difference? I'm mainly looking for specs on stock hulls rather than the lightened factory hulls used by the racing crowd.

    Thanks in advance for any info y'all can share


  2. #2
    Pistonwash's Avatar
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    Quote Originally Posted by mjh3ides View Post
    First Topic:
    I have a VX/GPR prop that I got from Lowell but am interested to know who machined these...was it Impros? Also, are the GPR shafts larger or smaller in diameter than the VX? The reason I'm asking is because I'd like to know if it's possible to get a VX Concord machined to fit a SHO which has a much larger shaft than the GPR.

    Second Topic:
    Anyone know what the differences in hull weight was over the production life of the GPR. I've been told that the 1300's were all the same while the 1200's were a bit heavier...if this is correct, how much is the difference? I'm mainly looking for specs on stock hulls rather than the lightened factory hulls used by the racing crowd.

    Thanks in advance for any info y'all can share

    2nd topic: The '05 and up hulls are lighter than the 1200's, by close to 40+ pounds. Hydrotoys and myself have weighed them...there is a difference.

  3. #3
    Happily Self-Employed WFO's Avatar
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    First Topic:
    I have a VX/GPR prop that I got from Lowell but am interested to know who machined these...was it Impros? Also, are the GPR shafts larger or smaller in diameter than the VX? The reason I'm asking is because I'd like to know if it's possible to get a VX Concord machined to fit a SHO which has a much larger shaft than the GPR.
    -Lowell was machining some and so did Impros. Lowell's uses the OE prop tool, and Impros' uses the Skat prop tool (has a hexagon in the front)
    -GPR shaft is larger than a stock VX shaft.
    -Check with Impros on the machining

    http://impros.com/

  4. #4
    mjh3ides's Avatar
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    Thanks guys, I appreciate the info.

  5. #5
    sleeplessnMS's Avatar
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    So my 04 hull is heavier than 05+??

  6. #6
    philip_gpr's Avatar
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    no, the lighter hull came out in 03

  7. #7
    cheatin' piston popper addicted's Avatar
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    i think 00-02 were the heaviest, 03-05 went on a diet, and 05-08 were the lightest. or so i was told.

  8. #8
    improvised tmg97gp's Avatar
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  9. #9
    mjh3ides's Avatar
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    Did fuel injection start in '03?

  10. #10
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by mjh3ides View Post
    Did fuel injection start in '03?
    yes

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