Its all controlled by fuel. If the Bleed ban opens to late the compressor
would force to much air into the combustor and a Stall will most likely
occur. This is when the in coming air actualy changes direction.
Comes right out the intake
I would love to get a tour of your brothers operation.
Come get me in one of those migs and the first round is on me.
What is amazing is the fuel control. It is a very complex unit.
You have to have some serious patience or alot of Corona to
take one of these apart. Even Arruda sends these out.
it has little fly weights that measure rpm of n1 n2 systems
Bellows that measure air density (altitude) It measures outside air temp.
incoming air pressure. It is all Mechanical.
It controls the air inlet vane guides, The bleed band, and of course
the fuel. It plots fuel schedules like takeoff, acceleration,deceleration
this is done with little internal cams and ramps.
You really have to give these guys credit it was late 1940s and 50,s
technology. In todays engines its all computer controlled.
Something else i find interesting is no one to my knowledge has replaced
this unit. with lets say a modified Motec. It has simple inputs and outputs.
and the Flow divider is really what controls the primary and secondary fuel nozzles.via incoming pressure. Perhaps it is what it is reliable.
Now I will Take my Freakin geek hat off now and go get some coffee.
Here is what the fuel control looks like.
Makes a holley Dominator look like a cereal box surprise.
Thread: turbine boat question??
Results 61 to 80 of 107
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01-27-2010 10:13 AM
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01-27-2010 01:45 PM
Gerry, Fuel Controls are amazing when you consider all they do and how they do it. And to think they were designed and put into operation way before the modern computer was made makes them even more amazing.
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01-27-2010 01:48 PM
Unreal complexity. Thanks for the education.
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01-27-2010 02:10 PM
So do they use water at all? I mean, it seems like the exhaust is only a few inches long and some have water coming out, some dont.. Can you run them on the trailer?
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01-27-2010 02:26 PM
Fascinating!
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01-27-2010 03:34 PM
I can not contribute much to the technical side of the discussion but can tell you just a bit about the boat. It is a 50 ft Airborne and is owned by DoubleR Performance in Ontario, Canada. DoubleR looks after my boats in Canada and I know the players well. With the boat being painted orange, like the General Lee, we all call it the Dukes of Hazard boat. We did the Rice Lake Poker Run in September when that video would have been taken. A part of that poker run has us going 16 miles up a narrow river and the cottagers all get off the water and watch the mayhem that afternoon each year. Raymond wisely chose not to do the river section with the Dukes of Hazard because of safety concerns.
http://www.youtube.com/watch?v=UlwsP...eature=related
When I grow up I want a turbine ! LOL
Bob
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- Join Date
- Nov 2008
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- 95
01-27-2010 03:55 PMhttp://www.turbinemarine.com/project...n_50_NT_V.html
this is the boat i was talking about. For some reason I remember them saying it was very quite. Bob it is a 50V.
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01-27-2010 04:00 PM
Yes they can run on the trailer and do not require any water.
Some boat riggers choose to run water threw the exhaust.
Others run dry wrapped exhaust.
One challenge is to keep the oil at 200F this can be done with a water
exchanger like a piston application. You could even use a air to liquid exchanger to accomplish this also. This is how its done in the helicopter.
A Turbine once lit will run on fuel and air only no power or water at all.
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- Join Date
- Jan 2009
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- 56
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- Join Date
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01-27-2010 04:43 PMAlso, when a "hot start" occurs, are you doomed to a rebuild? Are there systems to shut fuel off when this happens if you don't realize it? Is a hot start pretty common?
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- Join Date
- Nov 2008
- Location
- Kingston, ON Canada
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- 60
01-27-2010 06:01 PMBob already answered the question about which boat it is in the opening video, but here are a few more pics of it and another youtube vid prior to the orange paint http://www.youtube.com/watch?v=ShO4K6ySfzg
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01-27-2010 06:31 PM
i worked on turbines in the air force for little over 6 years. run certified for GE F110,F118,F101,TF33,TF34 and pratt & whits F100 series
most of my knowledge is in test cell and complete overhauls
first pic is a F110 that is getting new stage one blades
second is a blurring pic of me inspecting LPT rotor blades after a long augmenter run on cell
ive got some really cool pics somewhere of a f110 that had a spare fairing left inside and it blew the augmenter section down the thrust tunnel after i put it in afterburner... heard a loud boom, seen sparks and started pressing fire suppression. scared the sh!t outa all of us! oh the good ol dayswww.41apache.com
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01-27-2010 08:47 PM
Erik,
You can see it coming in the Pyrometer. Kill fuel and continue the spool.
Will drop the pyro almost instantly.
Wiring the Start fuel nozzles on a dedicated switch allows
the operator to kill the start fuel in the event of a Hot start.
I have had my Pyro pegged more then once. I was running home heating oil i had some plugged start fuel nozzles. let me tell you smoked more the a freight train and the pyro went to the moon.
Im at the dock and my crew was there holding the boat. I started spooling the starboard motor and I looked up and my crew were all freakin running away I looked behind me and the flame had to be 10 feet high
I just released the fuel and continued spooling exstinguishing the flame.
No damage occured what so ever.
There pretty stout engines and the more time you spend around them the more you get to know them.
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01-27-2010 09:37 PM
I spoke with Raymond tonight and made him aware of the thread. He does not post but Peter sometimes does. He has had the boat up to 155 MPH with lots of throttle left. They had to back off and not go higher as there was no windshield on the boat yet. They had helmets on and were getting tossed around like "bobble heads" till they had a windshield. It was installed after the season finished up in Canada. He thinks it will top out at 180 but that is an estimate only at this time. He will know when the ice is off the lakes. I asked about the turbines and he says they are sweet since they were re built at PPS in Pheonix last year. Oh yes, the boat can be bought. One of the things I like about DoubleR is they will take on interesting projects like this. I had to laugh while watching the video Joe549 posted. At the 3:29 mark I went by in my old PREDATOR. It was on Lake Ontario near Toronto and I had no idea I was caught on video.
Bob
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01-27-2010 09:55 PM
Great news!
Glad I was able to steer him in the right direction.
If he is not burning Jet A Tell him Kerosene works very well.
The amount of smoke in his start up video tells me he may be burning
something else.
Bob I look forward to your next big adventure. Good luck and be safe.
Gerry
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01-27-2010 11:20 PM
Its a turbo fan engine. Has a set of longer blades on the compressor section that blow air rearward outside the compressor/turbine sections for added thrust. Used in airliners and some fighter planes. Not helicopters as they need to convert all the power the turbine makes into mechanical energy, ie into the gearbox.
The other main styles of jet engines would be turbo prop. The turbine powers a shaft that runs through the center of the jet forward to hook to a gearbox and power a propeller. Used in commuter Jets, C-130's, P-3's etc.
And TurboJets, all the power is used to generate thrust straight out the back of the engine. Mostly used in fighter jets and older jet planes. The least efficient of modern jet engines
At least I think that's right.....2005 Formula 330ss