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Old 02-05-2010, 06:27 PM
  #11
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do you have anything in front of the drives drop box where it hangs below the transom? In the one pic it looks like its just sticks out with no deflection in front of it.
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Old 02-05-2010, 06:47 PM
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Quote:
Originally Posted by Catmando View Post
Not having water cooled exhaust can be dangerous. What are your plans to minimize the danger of fire?
This is a misconception in a turbine application it is actually
safer to have dry exhaust preferably stainless 321 or 430
for its heat resistance with the correct pyro wrap and fire
containment blanket suited for the temperature.
Keep it simple.

Ask the turbine boat owners who do have water cooled exhaust
what happens when the big 140lb DC electric motor fails
that operates the water flow to the exhaust.
How much does a 18inch diameter double walled stainless
exhaust pipe weigh that is 6 feet long?
Turbines don't need water so why use it.

Last edited by KNOT-RIGHT; 02-05-2010 at 07:09 PM. Reason: issues
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Old 02-05-2010, 07:11 PM
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Quote:
Originally Posted by 999JAY View Post
I have been thinking about this, so far I have rigged it with a 1.25" hose double clamped. I went with a large circulation pump originally because I was going to water cool the exhaust.

I decided to keep it simple for a first project and ditched the water cooled exhaust due to the work needed to pull this off.

Looks like I will have to fit a pressure dump to the stariner to keep the hoses in place.
Not sure if I will be running at speeds of 140+ but we will have to see how stable she is when in the water. I am little concerned about the torque steer on a single engine setup.
But there is only one way to find out!
Its going to fly!
3 ton at 1600hp hold on!
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Old 02-05-2010, 08:48 PM
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Quote:
Originally Posted by KNOT-RIGHT View Post
This is a misconception in a turbine application it is actually
safer to have dry exhaust preferably stainless 321 or 430
for its heat resistance with the correct pyro wrap and fire
containment blanket suited for the temperature.
Keep it simple.

Ask the turbine boat owners who do have water cooled exhaust
what happens when the big 140lb DC electric motor fails
that operates the water flow to the exhaust.
How much does a 18inch diameter double walled stainless
exhaust pipe weigh that is 6 feet long?
Turbines don't need water so why use it.
Learn something new every day around here, thanks.
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Old 02-06-2010, 01:16 AM
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Quote:
Originally Posted by KNOT-RIGHT View Post
This is a misconception in a turbine application it is actually
safer to have dry exhaust preferably stainless 321 or 430
for its heat resistance with the correct pyro wrap and fire
containment blanket suited for the temperature.
Keep it simple.

Ask the turbine boat owners who do have water cooled exhaust
what happens when the big 140lb DC electric motor fails
that operates the water flow to the exhaust.
How much does a 18inch diameter double walled stainless
exhaust pipe weigh that is 6 feet long?
Turbines don't need water so why use it.

Well, to start with the pump and DC motor is 32Ibs, not 140.
The pipe is 14", not 18".
We are on on boat 37 right now of which 30 have water cooled exhaust.
Only our race boats have dry exhaust, due to the unstable water pressure at speeds over 190 Mph. Every other boat we have completed have been outfitted with wet exhaust due to the benefit of unlimited cooling water.
With regard to reliabilety. We have had two electric motor failures in over 10 years.
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Old 02-06-2010, 04:11 AM
  #16
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Hi Dave
I am going to run a centre pod down the boat to deflect the water away from the bottom of the drop box, this s something else I will have to fabricate at a later date.

Knot-right
On your build I noticed you went with a pneumatic over hydraulic brake actuator for your free power turbine brake. There is a unit called a brakerite electric actuator that uses a simple 12v supply to activate you caliper.
Turbine Marine use these by the looks of it on there builds to simplify the braking system on gearshift.
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Last edited by 999JAY; 02-06-2010 at 04:30 AM.
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Old 02-06-2010, 09:14 AM
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Quote:
Originally Posted by J Arruda View Post
Well, to start with the pump and DC motor is 32Ibs, not 140.
The pipe is 14", not 18".
We are on on boat 37 right now of which 30 have water cooled exhaust.
Only our race boats have dry exhaust, due to the unstable water pressure at speeds over 190 Mph. Every other boat we have completed have been outfitted with wet exhaust due to the benefit of unlimited cooling water.
With regard to reliabilety. We have had two electric motor failures in over 10 years.
Sorry Johnny I tend to exaggerate.
When one fails I,m sure you now have something warning the operator of the Disaster which is moments away.

Either way you got all the check writers sold. keep up the
good work. You will have 100 boats under your belt shortly.

Best Regards
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Old 02-06-2010, 09:21 AM
  #18
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Quote:
Originally Posted by 999JAY View Post
Hi Dave
I am going to run a centre pod down the boat to deflect the water away from the bottom of the drop box, this s something else I will have to fabricate at a later date.

Knot-right
On your build I noticed you went with a pneumatic over hydraulic brake actuator for your free power turbine brake. There is a unit called a brakerite electric actuator that uses a simple 12v supply to activate you caliper.
Turbine Marine use these by the looks of it on there builds to simplify the braking system on gearshift.
Yes I looked into them there actually on our race car trailer.
A simpler approach indeed.
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Old 02-06-2010, 10:01 AM
  #19
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Quote:
Originally Posted by KNOT-RIGHT View Post
What size water pickup are you going to use?
I used one inch and had so much water pressure it blew
the double clamped hose right off and began to sink the boat
at 140mph.


I ended up adding a 1- 1/4 dump with check valve right out of
the strainer.

Another note I never really have had to use the manual
circulation pumps.
Even in long no wake zones the oil temp would be below
190 degrees.
hose clamps? wouldn't a -20 or -24 be much more reliable?
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Old 02-06-2010, 10:25 AM
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Quote:
Originally Posted by Sean H View Post
hose clamps? wouldn't a -20 or -24 be much more reliable?
Thats whats on there now -20

Where were you when I rigged it the first time?
I see you every now and then peeking down there

Sean the only indication I had that day was the pyro started to climb
shut it down and the water level was at the bottom of the turbine
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