Rik
Sponsor / Charter Member
Not even close.
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turbine boat question??
- Thread starter Jesse James
- Start date
Not even close.
Sick Sting
New member
Ask Knot Rght he has the 46 turbne skater around here very very smart in ths aspect he did his homework.
-Mike
-Mike
Rik
Sponsor / Charter Member
The starter is a generator as this is a DC motor. Simply put, the input shaft to the DC motor is splined and fits into a right angle gear box which in turn powers a gear (via a shaft) that is attached to the Compressor.
Being that on these engines (T53's and T55's) this is a purely "live" connection when the compressor is spinning it in turn rotates the DC motor.
When one closes the shunt field on a DC motor it becomes a DC generator.
insanity
New member
Nope not Hellfire, Hellfire's cockpit is a lot smaller and its exhaust is at the transom. But still sweet!
http://www.youtube.com/watch?v=j4Tr0syhIIo
tommymonza
New member
Thanks Rik.
The noise you here is the Power turbine wheel comming to a hault.
This is done by a caliper squeezing a rotor stopping it.
Then you engage the crash box and select forward neutral or reverse.
Here is a video worth 1000 words
http://www.youtube.com/watch?v=2HpbYDFGrkA
This is done by a caliper squeezing a rotor stopping it.
Then you engage the crash box and select forward neutral or reverse.
Here is a video worth 1000 words
http://www.youtube.com/watch?v=2HpbYDFGrkA
Seafordguy
Charter Member
HAHA - I love that boat right beside that little sailboat. Two complete extremes using that ramp!!
The 53 and the 55,s are Gas Turbine engines.
This means there is a gas producer n1. and a power turbine n2
These two systems are completely independent of each other.
N1 is the gas producer which means it produces Hot gas (Combustion)
that is directed and focused onto the Turbine Wheel (N2).
At low Rpm the Force is not significant enough so that the design
allows the N2 to be stopped without issue.
Picture a compressor airgun. EX. like a blow off nozzle that a garage uses
to blow debris off something.
If you put a free spinning Wheel in a vice. EX. Like a Computer fan.
If you apply the airgun to the fan the force of the air against the blades
will cause it to move. It will Move pretty fast also.
Imagine this computer fan coupled to a shaft and attached to a prop.
This is a basic analogy.
In a helicopter n1 is the throttle. and n2 is the rotor speed.
These are both adjustable by the pilot.
Throttle and Collective pitch.
The rotor increases and decrease pitch in turn starts to pull the rotor
speed down . There is a droop compensator which keeps the rotor
speed up in the event the pilot has a heavy load Ex, lifting logs etc.
In a boat the n1 is the throttle and n2 is locked down at a given setting.
In one of my trial runs we could not get the boat over 100.
The n2 was locked down to low. simply backing out the stop screw is
all it takes.
Now you could certainly run a throttle on n2. this would give you
two throttles on each turbine.
In caution one needs to remember the n2 control is the actual governor
of the rpm. the maximum rpm of this is roughly 23,000.
By pulling back on this lever as in leaving the water would never
slow it down quickly enough as not to cause a overspeed.
Hope this helps
MarylandMark
Charter Member
So..how do you throttle a turbine?
MarylandMark
Charter Member
Rik
Sponsor / Charter Member
Just like you throttle a normal boat. Push the lever forward and the motor accelerates, you can push N1 full then N2 or have N2 set and throttle N1
40FlatDeck
New member
Nice. Talk about some impulse torsional yield.
Rik
Sponsor / Charter Member
I would like to try a temporary throttle on n2.
Two complete turns out added 50 mph.
Do it. On the 40's we can run right at 140 with N2 pulled back. Then with N2 throttled it really comes alive.
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