Jet boat races in Taylor - 2015 World Marathon 

266 это удивительно, спасибо что написали это письмо, вы хороший человек 👍

bushpilot2001 yeah when they said "jet boat" this is not what I was imagining, it's even better.

yea who needs bullet when you have one of these lol, what do you think people would do if you showed up to a bass tourny with one of these.

14k in 75 is like 67k now. You're certainly not poor.

TheHandleSticks66 agreed

Hahahah maybe put a little 1000hp jet engine on it as well!

It means the same thing here. These are water-jet propelled boats. The unusual part is that the jet drives are powered by surplus helicopter gas turbine engines, which are a form of "jet engine". So if you wanted to, you could call them jet driven jet dive boats.

@@AgentJayZ Woah, fancy meeting you here. You are right, of course, but the irony of a jet boat having a jet engine is not lost upon me.

I was about to say I never knew that jet boats used jet engines ... Maybe the next step is not to be water jet driven, but exhaust jet driven

How many gallons of fuel do you think they burned through on this run, if you had to guess?

@@roadshoprick A lot, but at the same time, they aren't even close to loading that engine up like a helicopter would. I would bet it's a lot more fuel efficient in a boat than it is in a helicopter.

6771Randy fly inches above the water ?!

Pierre s'not mad i caught that too. Had to read it twice. Lol

It was great! The pilot said we were going to need to do a huge, diving turn to keep up at the start. It felt like surfing down the face of a 200 foot high wave. As you can see we dropped down to about 20ft, and were just barely keeping up. I loved riding in that thing.

😂

I think you meant "167"

If you were sitting on the engine in this boat, your eyes would be where we put the cameras.

This akin to being a otr cross country driver, although it 15 to 20 mph slower.

It's a water jet, powered by a turboshaft engine... whaddya want?

Mercury Visions yeah man definitely a sustained 130+ for like almost a minute!!!!

Yeah, he should be more careful. Those turbines get pretty hot .

Manually controlled by two push buttons on the steering wheel. I think Auto-stab would be a great addition to these boats!

In actuality, they are safer and, I believe, crash less often than the piston motors. Now that's not to say they aren't terrifying, HOWEVER, everyone that I've ever asked, loved it!

1: sounds about right... this sport evolved from using extremely shallow draft boats to go up rivers where other boats couldn't 2: a 1500 Hp small block is more expensive and less reliable than a used helicopter engine. There is a Mercury Marine 1500 Hp factory race motor that has beaten the turbine boats, though. 3: The driver focuses on driving - looking at most a couple hundred yards ahead. The navigator is required by the rules for safety, and he/she takes the long view, deciding which course to take. The rivers raced on have multiple channels separated by gravel bars, and most of the races are about 30-40 miles in length up and back down a river. At over 130 Miles per hour, things come at you quickly.

jj Thomas I don't think you get the motorsports thing at all ! you just think you do you should do your self a favor and STFU!

Run a net behind it and you have a mega carp-fishing machine XD

Hehehe it is a jet boat... the propulsion comes from a water jet. The extra "thrust" from the engine is nonexistant... no nozzle. If you had the water jet and a vectored thrust from the turbine... the combined power output would be like 2000-2500hp As is... 1500hp+ to the jetpump is still scary fast and impressive.

BillyNoMates1974 Also noticed that! +AgentJayZ - I would love to see the disaster gearbox in detail, and repair if possible! more details on the boat now then its under the repair! Thanks!

BillyNoMates1974 due to the extreme heat build up I think it was not something breaking inside or getting overloaded, I think something on the lubrication or cooling System failed, raising temperature to the point where the oil burned and then it ripped itself appart... maybe Jay provides us with some details

+D. C. Have you ever raced anything before? No, there is no rear view mirror.

No, they are used by the driver varying the small amount of lift they produce to adjust the angle of the hull to optimize the water pump inlet at the rear of the boat.

The Canadian rivers are wider, and allow a lot of full power running.

1400 Hp is the active ingredient.

Throttle is connected to a pedal. 2nd question requires an answer that exceeds the character limit. Suggested remedy: watch playlist: Your Questions Answered

No. All of the available energy in the exhaust is used by the power turbine to turn at 18,000 rpm and with over 350 ft-lbs of torque. The integral reduction gearbox has a 3:1 ratio, so the output shaft turns at about 6000rpm with about a thousand ft-lbs. Only thing left in the exhaust is heat.

It's just like driving a jet ski. The impeller is what controls the boat. Lose that and you're just along for the ride.

***** Answered so many times, this question is also retired.

+Jonah Beale The engines provide the hydraulic pressure needed to operate the steering, no engines, no steering, simples.

The steering is not hydraulic, but a simple cable and linkage system.

oh, then that is weird.

The boat is moved by a conventional water jet drive. That is powered by a retired helicopter turboshaft engine, in place of a V-8.

@@AgentJayZ Insane! I'd love to see it in real-life

Correct. Incorrect. No. Single shaft, slow acting, controlled by driver, help set hull angle to optimize water jet inlet.

Also could you just get a prop made so you don't have to have a gearbox to reverse the rotation?

Jet thrust is not only very inefficient for a boat (so a losing plan for a race boat), but dangerous and not allowed by the rules. Props are more efficient, but these boats often race in water less than 4 inches deep, so... no go.

Sorry i meant could you make an impeller for your jet pump that's screwed the other way. I guess it's probably not an easy thing you can just turn up on your lathe at home. Thanks heaps for replying by the way, heaps interesting stuff

We've discussed reverse impellers a few times. Bottom line: 5 grand a piece, and they last one leg. Two if you're lucky. Twelve race legs in a championship, and you must finish all 12 to be eligible to win. Regular rotation impellers are about a thousand apiece, and last one race leg, maybe two.

@@AgentJayZ ah awesome thanks heaps! Guess this is the trouble with RU-vid recommending random videos to people, you must have to answer these questions a lot. Maybe you need a faq. Thanks again, awesome to get answers on such an interesting subject.

Stock impellers are about a thousand apiece, and last about one hour. Revere impellers are five thousand, and last about an hour.

@@AgentJayZ Ah I did not realize they had such a short service life. Is that due to debris in the water?

You force 1200 horses through a 400 horse gate, stuff is gonna break.

Remote control by the driver. You can send me something cool in trade, or spend a couple bucks at redbubble : Jet City Turbines

Yeah, let's spend 25 grand, and more importantly 300 lbs in a race machine that does not have the room for a secondary drive system... that it will have to carry as dead weight for the whole race. We'll need a separate fuel tank, and more controls, and more faffing about in the first 20 seconds of the race, to save 10 of them... for a boat that runs away from the competition. The problem in this video was a failed gearbox. If we fix the reliability issues. we win by minutes, not seconds. Your attention is appreciated, but you are focusing in the wrong area.

Imagine if they vectored the turbine's thrust through a nozzle?!

I think Gord used the remaining speed of the boat to get it to the bank or a sandbar.

Common question. Very long answer. The most important points are: 1) The closer the propelling jet speed is to the vehicle speed, the more efficient it is. 2) That is against the rules.

no do you?

There's no control once the impeller stops doing its job. All of the control comes from the water shooting out of the jet. Just like a jet ski. The boat was in a turn, so when the gear box let go the boat slowed down instantly, causing the right side of the boat to "hook" in the water. If you kill the power like that with any boat in a high speed turn, that will happen.

John Davis Actually, when the pump stops directing the boat, it should straighten out and begin to slow. Can't tell you how many times I've seen newbies to jet drives get in trouble and let off the gas, then turn the wheel. Goes straight into the obstacle. Would have expected the same thing here unless there's a current component that pushed the nose around. Just my 2.

BeachBow Yes, exactly, it wants to go straight - but you're missing one part. When the boat is in a high speed turn, and decelerates quickly (mechanical failure) it wants to keep going in a straight line, instead of through the turn. This momentum causes the boat to hook on the right side, which will throw the boat violently to the left. This was basically an un-commanded maneuver called a "crash stop."

rkan2 How about we think of it as a boat... on water... going 240Km/h... somehow that seems a bit more realistic. No wheels, no brakes, no pistons, no pavement.. yeah, it seems almost ridiculously stupid to try to think of it as a car.... 'cause it's a boat, on water, not a car, on pavement.... Hmmm... Imagine that.

Yes. Boat is no longer able to move... steer to shore, or drift down the river..

These aren't drag boats. I don't know anything about boat drags.