turbine boat question??

[Rik]

According to Randy Sweers, Canada Thrust has the biggest turbines in a pleasure boat. He said it pulls like a solid rocket booster.

Not even close.

[Sick Sting]

Ask Knot Rght he has the 46 turbne skater around here very very smart in ths aspect he did his homework.
-Mike

[Rik]

What does the starter sytem look like and how does it work?

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]

As little interest as I have in owning a turbine boat, I'll ALWAYS watch them run!

Was that Hellfire? It doesn't really look like I remember it, but it's been a few years since I've seen it.

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]

Thanks Rik.

[KnotRight]

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

[Seafordguy]

http://www.youtube.com/watch?v=KQdY_...eature=related




what is n1 and n2 and do they require sperate throttles and if so why?

thanks...

HAHA - I love that boat right beside that little sailboat. Two complete extremes using that ramp!!

[KnotRight]

I have heard the turine boats around the docks make a noise like a am radio losing tune... it is in this video at around 2:40 and throughout the rest of the video

http://www.youtube.com/watch?v=KQdY_...eature=related


also in the powerboat article they were talking about the throttle set up in copelands phenomenon...and it lead me to believe they had to do some engineering to get it down from 12 levers, and they indicited a seperate throttle for n1 and n2......

what is n1 and n2 and do they require sperate throttles and if so why?

thanks...

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.

[KnotRight]

So does the N1 and N2 require seperate levers or is it automatic?

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

[KnotRight]

Here is the helicopters these were engineered for


t53 huey

t53 703 cobra

t55 chinook


Anyone wanna guess why its called t53?????

[MarylandMark]

By pulling back on this lever as in leaving the water would never slow it down quickly enough as not to cause a overspeed.

So..how do you throttle a turbine?

[MarylandMark]

Anyone wanna guess why its called t53?????

T for turbine
53 for military number

[macjazzy]

53, 5 Stage compressor, 3 stage turbine

[Rik]

So..how do you throttle a turbine?

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

[KnotRight]

good answers..............


It was engineered in 1953

[KnotRight]

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

I would like to try a temporary throttle on n2.

Two complete turns out added 50 mph.

[40FlatDeck]

Not even close.

I like that answer....

[KnotRight]

anticipating the water and pulling back faster.

Most turbine installations have the n2 locked down and throttle the n1.

In any case it will throw torque at the drives like ya read about!

[cigdaze]

anticipating the water and pulling back faster.

Most turbine installations have the n2 locked down and throttle the n1.

In any case it will throw torque at the drives like ya read about!

Nice. Talk about some impulse torsional yield.

[Rik]

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.