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Strut Angle

  1. #15
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by rampage View Post
    Measered the v-drive Its at 98'' to the transom, motor is 36''to the transom, prop shaft is 77'' tip to tip, V-drive is 10 deg. I'll get an angle finder today.

    Well depending where your strut is I'd guess 7.25-7.5 degrees if the v-drives at 98" but you'll have to measure to know for sure. Where are your plates set, 1/8" up or?

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  3. #16
    '77 Hondo GT rampage's Avatar
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    Quote Originally Posted by Carnivalride View Post
    Well depending where your strut is I'd guess 7.25-7.5 degrees if the v-drives at 98" but you'll have to measure to know for sure. Where are your plates set, 1/8" up or?
    If I measured right looks like 1/4'' used a straight edge.

  4. #17
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by rampage View Post
    If I measured right looks like 1/4'' used a straight edge.
    That might be part of your trouble try setting the plates at 1/8" up or maybe just go 3/16" since your at a 1/4" now that will bring the nose down.

  5. #18
    '77 Hondo GT rampage's Avatar
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    Quote Originally Posted by Carnivalride View Post
    That might be part of your trouble try setting the plates at 1/8" up or maybe just go 3/16" since your at a 1/4" now that will bring the nose down.
    I must be doing it wrong now I'm getting 3/8''-1/2'' on drivers side, 1/8''-1/4'' passenger side, rocker in the hull must be throwing it off. Whats the right way to measure cav-plates?

  6. #19
    Distinguished Member David 519's Avatar
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    Quote Originally Posted by rampage View Post
    Had a rb that measured 10 7/8 x 14 2 blade seem to run bow high(to me) turn fin was out of the water 3-5'' new prop this spring. So strut angle, prop, cav plat height will be the overall determing factor, on how high the bow runs. Yes I see the light
    How far forward the prop is also has a pretty big effect on how high the bow carry's. If the prop is way forward, tends to lift the bow. Back it will ride flatter. Our boat ran to flat and was a bit of a tail dragger. We put a prop on with some lift and moved it forward and it's helped a bunch. We still have a ways to go, but getting there.
    I've never used an RB prop, but what I've heard, they have some very specific/unusual characteristics based on what boat it was built for. Talking to a guy yesterday that had one with the biggest ear I've ever heard of for a runner bottom. The other thing is a 14 pitch is really small for what your doing. Probably not a contributor to the bow height issue, but a 15 or 16 pitch is a lot more common on runner bottoms.
    Good luck.
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  7. #20
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by rampage View Post
    I must be doing it wrong now I'm getting 3/8''-1/2'' on drivers side, 1/8''-1/4'' passenger side, rocker in the hull must be throwing it off. Whats the right way to measure cav-plates?

    Generally you take about a 4' straight edge and put it under your center pod next to the edges. It should sit pretty flat on the back 2-3' there, and measure from the top of that straight edge to the bottom of the plate.

    Oh and the plates need to be in the full "up" position.


    Did you say you were running one of these High HP props?
    http://rbprops.com/fbottom_props.html

  8. #21
    '77 Hondo GT rampage's Avatar
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    Quote Originally Posted by David 519 View Post
    How far forward the prop is also has a pretty big effect on how high the bow carry's. If the prop is way forward, tends to lift the bow. Back it will ride flatter. Our boat ran to flat and was a bit of a tail dragger. We put a prop on with some lift and moved it forward and it's helped a bunch. We still have a ways to go, but getting there.
    I've never used an RB prop, but what I've heard, they have some very specific/unusual characteristics based on what boat it was built for. Talking to a guy yesterday that had one with the biggest ear I've ever heard of for a runner bottom. The other thing is a 14 pitch is really small for what your doing. Probably not a contributor to the bow height issue, but a 15 or 16 pitch is a lot more common on runner bottoms.
    Good luck.
    The front of the hub of the prop is 21''3/4 to the back of the cav-plate

  9. #22
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by rampage View Post
    The front of the hub of the prop is 21''3/4 to the back of the cav-plate
    Say what? You front of the prop hub is only 21-3/4" from the aft edge of your plate? Usually you measure from the farthest aft point on the tip of the blade to the back of the cavitation plate.

  10. #23
    '77 Hondo GT rampage's Avatar
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    Quote Originally Posted by Carnivalride View Post
    Generally you take about a 4' straight edge and put it under your center pod next to the edges. It should sit pretty flat on the back 2-3' there, and measure from the top of that straight edge to the bottom of the plate.

    Oh and the plates need to be in the full "up" position.


    Did you say you were running one of these High HP props?
    http://rbprops.com/fbottom_props.html
    Middle pod says 1/8'' on both sides. Yes I was

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  11. #24
    '77 Hondo GT rampage's Avatar
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    Quote Originally Posted by Carnivalride View Post
    Say what? You front of the prop hub is only 21-3/4" from the aft edge of your plate? Usually you measure from the farthest aft point on the tip of the blade to the back of the cavitation plate.
    24''1/8 from the back ear of the prop to the back of the cav-plate

  12. #25
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by rampage View Post
    Middle pod says 1/8'' on both sides. Yes I was

    What is the tip of the blade to the plate measurement I run a Tom Black version of this prop for my 1000' stuff and it creates tail lift on mine and I have to move it under the boat to compensate (otherwise it plows after about the 600' mark).

  13. #26
    '77 Hondo GT rampage's Avatar
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    Quote Originally Posted by Carnivalride View Post
    What is the tip of the blade to the plate measurement I run a Tom Black version of this prop for my 1000' stuff and it creates tail lift on mine and I have to move it under the boat to compensate (otherwise it plows after about the 600' mark).
    20''3/4 tip of prop to back cav-plate

  14. #27
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by rampage View Post
    20''3/4 tip of prop to back cav-plate
    Your Hondo must be way different than mine, besides the v-drive placement difference this is off to. On mine the Tom Black BGF prop that looks like RBs likes 21-1/2" on mine. I'm out of ideas as to why your dragging the tail and flying the skag if your plates are set at an 1/8" up and your v-drive is at 98" and your prop is that far back. Have you tried any other props, does it ride like that with all of them?

  15. #28
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    Quote Originally Posted by rampage View Post
    24''1/8 from the back ear of the prop to the back of the cav-plate
    Move that prop forward! My 81 hondo from the rear barrell of the strut was24 1/2 in. It ended up at 26-3/4 with 1/4 on an in. clearance for a prop puller now this is from the rear barrel. thanks to Mr. Constantino for the measurement off of Looky lou.

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