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#21
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Jet boats. Any opinions or experience?
Jetcraft with a 7.4L GM close coupled to a Hamilton 212. Close coupling
eliminates the U-joint and its possible failure points, and makes engine box smaller. If the neutral no-go position is adjusted properly and wheel is straight ahead, bucket directs flow down and to out to each side equally so boat is stationary, or becomes stationary if moving. (The brakes on this thing are amazing; probably should have seat belts) Turning the wheel at this point unbalances the side flows so boat will spin around a point very close to center, with no net forward or reverse movement. "Netsock" wrote in message ... "Steve Alexanderson" Idon'tlikegreeneggsandspamIdon'tlikethemsamIamsal wrote in message ... [snip] shaft, with no gearing, joints, or cylinders. The steering cable turns the nozzle, and the thing that looks like a gear shift controls the bucket, providing forward/reverse and a no go position that still allows turning. What kind of jet boat do you have? Most, if not all, have a universal joint set between the engine and drive. Also, please explain how you can turn in a "no go" position. Later... -- -Netsock "It's just about going fast...that's all..." http://home.insight.rr.com/cgreen/ |
#22
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Jet boats. Any opinions or experience?
wrote in message ... Ummmm, before you call people morons, please check out the for who said what. The "unknowledgeable" original writer (me) is NOT the person with the political statements. In fact, I think I'm going to check on some political groups to see if they have a lot of boating information in them. Don ............ You misunderstood. My comment was directed to one H Krause. He is the moron. On Mon, 26 Jul 2004 18:37:38 -0400, "jim--" wrote: "Harry Krause" wrote in message ... wrote: Due to my requirements of shallow draft, light weight and relatively plush interior, I find myself looking into jet boats as a likely purchase. My questions are as follows: Does "jet boat" mean "jet drive" and what exactly does jet drive mean? A gas turbine drives a fan that sucks in air, mixes it with burning fuel, and then blasts the expanded air-gas mixture out the back. Because every action has an equal and opposite reaction, as the air streams backward the engine is forced forward, taking along its container, so to speak. Is a jet drive fairly straightforward in maintainability? Certainly, if you are a trained jet drive mechanic. Can marine mechanics in a podunk Florida fishing village work on these? Yes, but there is a likelihood he will pooch it. Living on a large sound in the Gulf, just how much wave action can this boat take before it becomes unsafe? I'd slow down when waves start coming over the bow. Of course, that's me. Your gallonage may vary. Thanks in advance for any knowledge you have of this. It is MUCH appreciated. Don -- A vote for Nader is a vote for Bush; A vote for Bush is a vote for Apocalypse. You really are a moron. |
#23
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Jet boats. Any opinions or experience?
"Netsock" wrote in message ... "Steve Alexanderson" Idon'tlikegreeneggsandspamIdon'tlikethemsamIamsal wrote in message ... [snip] shaft, with no gearing, joints, or cylinders. The steering cable turns the nozzle, and the thing that looks like a gear shift controls the bucket, providing forward/reverse and a no go position that still allows turning. What kind of jet boat do you have? Most, if not all, have a universal joint set between the engine and drive. Also, please explain how you can turn in a "no go" position. Most of the more advanced pumps have buckets which shoot down and to the sides(along with forwards), when you turn the nozzel, the side forces get unbalanced and spin the boat. Often with larger jets the pumps are also clutched and with multi units they have an option to independently control the steering per pump. |
#24
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Jet boats. Any opinions or experience?
Most of the more advanced pumps have buckets which shoot down and to the
sides(along with forwards), when you turn the nozzel, the side forces get unbalanced and spin the boat. Often with larger jets the pumps are also clutched and with multi units they have an option to independently control the steering per pump. All my experience has been with big block Berkeley and Dominator pumps. Those keep a "neutral" by equally maintaining rear, and forward thrust. A properly set up Berk or Dom will not move in "neutral" no matter what way the nozzle is pointed. Oh well...live and learn! -- -Netsock "It's just about going fast...that's all..." http://home.insight.rr.com/cgreen/ |
#25
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Jet boats. Any opinions or experience?
"Netsock" wrote in message ... Most of the more advanced pumps have buckets which shoot down and to the sides(along with forwards), when you turn the nozzel, the side forces get unbalanced and spin the boat. Often with larger jets the pumps are also clutched and with multi units they have an option to independently control the steering per pump. All my experience has been with big block Berkeley and Dominator pumps. Those keep a "neutral" by equally maintaining rear, and forward thrust. A properly set up Berk or Dom will not move in "neutral" no matter what way the nozzle is pointed. Oh well...live and learn! -- -Netsock "It's just about going fast...that's all..." http://home.insight.rr.com/cgreen/ The river jet boats normally run a low pressure pump. Berkeley and Dom are high pressure. Small nozzle outlet. The Hamilton and earlier Kodiak that I run are triple impellers in a same size tube. Very little restriction at the opening. Work better if you lose prime in a set of rapids. Bill |
#26
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Jet boats. Any opinions or experience?
Most of my jet pump experience is with KaMeWa units behind 1500+hp Diesels
or 3500+hp gas turbines. "Netsock" wrote in message ... Most of the more advanced pumps have buckets which shoot down and to the sides(along with forwards), when you turn the nozzel, the side forces get unbalanced and spin the boat. Often with larger jets the pumps are also clutched and with multi units they have an option to independently control the steering per pump. All my experience has been with big block Berkeley and Dominator pumps. Those keep a "neutral" by equally maintaining rear, and forward thrust. A properly set up Berk or Dom will not move in "neutral" no matter what way the nozzle is pointed. Oh well...live and learn! -- -Netsock "It's just about going fast...that's all..." http://home.insight.rr.com/cgreen/ |
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