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  1. #1
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    Chopper on a ProMax 300

    Been considering trying a big blade chopper on my Rally Sport 21 300 ProMax. Standard small shaft unit. My concerns are will the 300 likely break a blade, possibly breaking the shaft? Anyone run a chopper on a 300?
    18 Talon/2.4 carb SOLD
    26 Deck Boat/250 Merc

  2. #2
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    Quote Originally Posted by 99fxst99 View Post
    Been considering trying a big blade chopper on my Rally Sport 21 300 ProMax. Standard small shaft unit. My concerns are will the 300 likely break a blade, possibly breaking the shaft? Anyone run a chopper on a 300?
    interesting question, Mercury recommends a cleaver for the 300 hp. Mazco says (web site , looking at a 3 and 4 blade chopper) "The blades are thinned for ultimate speed, but yet thick enough for durability and are able to withstand the torque of the highest horsepower outboards." Looks like Hill Marine has choppers under 300 hp and cleavers over 300 hp. Good luck. breaking a blade at 5000 plus rpms sounds scary.

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  4. #3
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    We threw some blades at WOT on the 300PM... 4 out of 5 grenaded the brand new sportmasters and sent everything to the bottom of the lake.

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  6. #4
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    Quote Originally Posted by David - WI View Post
    We threw some blades at WOT on the 300PM... 4 out of 5 grenaded the brand new sportmasters and sent everything to the bottom of the lake.
    That's all I need to hear. Pretty much what I thought. I guess it goes on the shelf for now.
    18 Talon/2.4 carb SOLD
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  7. #5
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    Best prop would be a Hoss HPD in a 28,29 or 30. Strong and great blade shape for take off, lift and top end. One of my best props for my 22' activator and 21' superboat with 300 merc.

    Best to convert to fat shaft however for strength as pressure on standard shaft get too high when running blades high out of water at top end.
    Last edited by dnelson964; 08-08-2021 at 05:39 PM.
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

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  9. #6
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    Another top prop I will say best to try in standard shaft is a Spinelli DR4 29 with a touch extra cup by Tim Hoss. Was my fastest and good weight carry at high engine heights.
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

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