Just Turbines
07-30-2020, 11:38 AM
#681
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Thread Starter
ok here is a update
I had two water leaks (rudder bolts) and very high pyros 1500f on both engines. ( i removed the dedicated fresh air ducts from turbine intakes) gotta address this again.
so i decided too run it for two short runs back to back.
this is my limited observation. The entire boat feels lighter especially in the stern.
You do not have that planted feel you had with the skegs on the sixes. Its almost like its chine walking slightly sponson to sponson.
You can see in the video n2 is around 55 percent which is about half max prop speed. around 88mph!!!!
this is about 8-12 mph faster then the sixes. So the boat seems more efficient.
Rudder turns the boat like its on railroad tracks.
you can see it when i move wheel.
trim was set at midstroke of cylinder and really not touched
tabs were all up.
Around the dock the rudder will turn boat but very wide arch!
you have to use engines forward and reverse to turn!
16 x35 props
did not exceed 113mph because of fear of melting the turbine gp nozzles.
the 46 skater needs at least 120mph air in the tunnel to even begin to run right!
so much more to do!!!!
I had two water leaks (rudder bolts) and very high pyros 1500f on both engines. ( i removed the dedicated fresh air ducts from turbine intakes) gotta address this again.
so i decided too run it for two short runs back to back.
this is my limited observation. The entire boat feels lighter especially in the stern.
You do not have that planted feel you had with the skegs on the sixes. Its almost like its chine walking slightly sponson to sponson.
You can see in the video n2 is around 55 percent which is about half max prop speed. around 88mph!!!!
this is about 8-12 mph faster then the sixes. So the boat seems more efficient.
Rudder turns the boat like its on railroad tracks.
you can see it when i move wheel.
trim was set at midstroke of cylinder and really not touched
tabs were all up.
Around the dock the rudder will turn boat but very wide arch!
you have to use engines forward and reverse to turn!
16 x35 props
did not exceed 113mph because of fear of melting the turbine gp nozzles.
the 46 skater needs at least 120mph air in the tunnel to even begin to run right!
so much more to do!!!!
The following 3 users liked this post by KNOT-RIGHT:
07-30-2020, 11:39 AM
#682
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resurrected (07-31-2020)
07-30-2020, 11:44 AM
#683
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The following 5 users liked this post by KNOT-RIGHT:
c0ncEpT (08-05-2020), Gimme Fuel (07-31-2020), Padraig (07-30-2020), resurrected (07-31-2020), Tiki Joe (07-30-2020)
07-30-2020, 03:24 PM
#684
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WOW boat looks fabulous all finished can't wait to see the results when it's all dialed in.
I would imagine not only are the BPMs more efficient due to less drag in the water you have also picked up about 10% more HP at the prop on each side due to the elimination of the gears and vertical shafts in the Vl.
I noticed with my BPMs you can turn the input shaft effortlessly with two fingers so the internal drag must be minimal.
What the reason for the high EGTs was that the new intakes reducing airflow through the engine? Turbine Marine had carbon ones fabricated with a big radius in the lower section to reduce turbulence and increase volume and draw air from the engine hatch as opposed to the bilge, thought about them for mine but decided to leave it as is.
I would imagine not only are the BPMs more efficient due to less drag in the water you have also picked up about 10% more HP at the prop on each side due to the elimination of the gears and vertical shafts in the Vl.
I noticed with my BPMs you can turn the input shaft effortlessly with two fingers so the internal drag must be minimal.
What the reason for the high EGTs was that the new intakes reducing airflow through the engine? Turbine Marine had carbon ones fabricated with a big radius in the lower section to reduce turbulence and increase volume and draw air from the engine hatch as opposed to the bilge, thought about them for mine but decided to leave it as is.
07-31-2020, 08:37 AM
#685
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Thread Starter
I had dedicated fresh air ducts See here
I had to delete them to lower turbines 4.5 inches this is drawing to much engine bay heat
08-01-2020, 11:44 AM
#686
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Strange mine runs similar mesh screens and the engines are low down in the bilge what I have noticed the air intakes on the hatches are much larger probably at least double the size of a standard supercat.
I gather your next plan is to get more air in and more hot air out of the engine bay.
I gather your next plan is to get more air in and more hot air out of the engine bay.
08-01-2020, 02:36 PM
#687
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Thread Starter
yes!!!
how is your air exiting the engine bay?
here is another video on another angle
how is your air exiting the engine bay?
here is another video on another angle
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I'CE (08-04-2020)
08-01-2020, 04:11 PM
#688
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Volume going in seems to be far greater than what can come out but I suppose that stands to reason I would imagine that will help positive pressure in the engine bay.
08-01-2020, 06:20 PM
#689
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Knot Right, can you morph your 6 small vents on the transom to make 2 larger vents to evacuate heat or would water intrusion be an issue?
08-03-2020, 07:48 AM
#690
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Thread Starter
Im going to try dividing off the engine bay
so as to act like a big fresh air duct.
i am going to use a sheet of 3/8 silicone rubber
rated at 450degrees.
the small vents in the back could be opened
howevr there is quite a bit of rudder blow back
just before coming on plane
I will form tge silicone to bend forward to meet the hatch as it closes
so as to act like a big fresh air duct.
i am going to use a sheet of 3/8 silicone rubber
rated at 450degrees.
the small vents in the back could be opened
howevr there is quite a bit of rudder blow back
just before coming on plane
I will form tge silicone to bend forward to meet the hatch as it closes
