Mmmmm I like it!
#1
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#6
Beak botr
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Don't know what is so good about these big boats with the jet ski drives. I have a 10 foot Sea-doo with 185 HP and it tops out at about 57 with me on it and full of fuel.
If it had a surface drive for the size and weight, it would run well over 100. I fully understand from a safety standpoint why jet ski's need the pumps, but for these big boats, I have to wonder just what they would do with properly set up surface props?
It appears to be a fad, and not a very good one at that.
Another example, Jet boat with 1200 HP blown BBC, tops out at 80 to 100. Put a surface drive on it and look out, 150 to 190, if you could keep it right side up and on the water.
If it had a surface drive for the size and weight, it would run well over 100. I fully understand from a safety standpoint why jet ski's need the pumps, but for these big boats, I have to wonder just what they would do with properly set up surface props?
It appears to be a fad, and not a very good one at that.
Another example, Jet boat with 1200 HP blown BBC, tops out at 80 to 100. Put a surface drive on it and look out, 150 to 190, if you could keep it right side up and on the water.
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I started with a 25 foot rag-hauler at 4 knots; moved up to 60 feet at 32 knots and 96 gph; now I'm at 50 feet, going 50 knots, at 35 gph. Surface drives are working real nice for me.
I have not been around with a big jet drive boat was in port, so I have not seen one. I wonder how well they work in big, lumpy seas, when there are no backs to the waves?
I have not been around with a big jet drive boat was in port, so I have not seen one. I wonder how well they work in big, lumpy seas, when there are no backs to the waves?
#8
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From my experience working on the bigger boats is that I have yet to see a turbine in a yacht use anything but a jet drive. I do not know why they use jet drives, you would think that a surface drive would be a better choice.
One thought is that, and I have no idea if this is possible or not, but on pleasure boats that have turbines, they all seem to use some sort of caliper to break N2 (I think) which makes it possible to shift gears. maybe there is not a system strong enough for these 5000hp turbines, so the jet drive just skips that problem all together.
Why any yacht uses a jet drive is beyond me, I have spoken to a lot of captains and they all say that they are way more of a pain in the azz to dock, and they generally maneuver like crap, over a conventional twin screw yacht.
One thought is that, and I have no idea if this is possible or not, but on pleasure boats that have turbines, they all seem to use some sort of caliper to break N2 (I think) which makes it possible to shift gears. maybe there is not a system strong enough for these 5000hp turbines, so the jet drive just skips that problem all together.
Why any yacht uses a jet drive is beyond me, I have spoken to a lot of captains and they all say that they are way more of a pain in the azz to dock, and they generally maneuver like crap, over a conventional twin screw yacht.
#10
From my experience working on the bigger boats is that I have yet to see a turbine in a yacht use anything but a jet drive. I do not know why they use jet drives, you would think that a surface drive would be a better choice.
One thought is that, and I have no idea if this is possible or not, but on pleasure boats that have turbines, they all seem to use some sort of caliper to break N2 (I think) which makes it possible to shift gears. maybe there is not a system strong enough for these 5000hp turbines, so the jet drive just skips that problem all together.
Why any yacht uses a jet drive is beyond me, I have spoken to a lot of captains and they all say that they are way more of a pain in the azz to dock, and they generally maneuver like crap, over a conventional twin screw yacht.
One thought is that, and I have no idea if this is possible or not, but on pleasure boats that have turbines, they all seem to use some sort of caliper to break N2 (I think) which makes it possible to shift gears. maybe there is not a system strong enough for these 5000hp turbines, so the jet drive just skips that problem all together.
Why any yacht uses a jet drive is beyond me, I have spoken to a lot of captains and they all say that they are way more of a pain in the azz to dock, and they generally maneuver like crap, over a conventional twin screw yacht.
Hope this helps,
ND1