Turbo Prop question
04-22-2013, 06:31 PM
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Turbo Prop question
How can you tell if you are getting enough lubrication to the geardrive on the JetCat turbine?
Looking at the fuel line while running it doesn't seem to be moving the enough fuel to the front bearings.
Everything is hooked up like the manuel states. Just wondering. Thanks, Mike Haddox
Looking at the fuel line while running it doesn't seem to be moving the enough fuel to the front bearings.
Everything is hooked up like the manuel states. Just wondering. Thanks, Mike Haddox
04-22-2013, 10:28 PM
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RE: Turbo Prop question
Mike
You really don't see flow because the can is connected to the same line and provides an air bleed system to push the fuel through, there is allot of air and only a small amount of fuel.
If you have doubts just pop the line off going into the gearbox, clamp the main fuel line closed and run the pump in prime mode. You should see a small dribble of fuel that has come via the needle restictor/final filter.
You really don't see flow because the can is connected to the same line and provides an air bleed system to push the fuel through, there is allot of air and only a small amount of fuel.
If you have doubts just pop the line off going into the gearbox, clamp the main fuel line closed and run the pump in prime mode. You should see a small dribble of fuel that has come via the needle restictor/final filter.
04-23-2013, 04:46 AM
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RE: Turbo Prop question
Thanks Bart,
Just wondering. Didn't want to starve it of lubrication. I don't understand why the pressure from the bottom of
the engine is used. It seems that the pressure would push the fuel back toward the pump. I'm sure JetCat has all that figured out.
Great running little engine. It's amazing how far our hobby has come. Mike
Just wondering. Didn't want to starve it of lubrication. I don't understand why the pressure from the bottom of
the engine is used. It seems that the pressure would push the fuel back toward the pump. I'm sure JetCat has all that figured out.
Great running little engine. It's amazing how far our hobby has come. Mike
04-23-2013, 12:33 PM
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RE: Turbo Prop question
They are a great engine Mike, I really enjoy mine.
The air is used to help "vaporise" the cooling/lube fuel through the box. If it was set up as an oil bath there would be way too much drag and mechanical loss.
The fuel pump is already seeing the same pressure as it is pumping fuel through the needles into the combustion chamber which is at the same pressure as the can.
The air is used to help "vaporise" the cooling/lube fuel through the box. If it was set up as an oil bath there would be way too much drag and mechanical loss.
The fuel pump is already seeing the same pressure as it is pumping fuel through the needles into the combustion chamber which is at the same pressure as the can.
09-20-2014, 05:47 PM
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Can you guys tell me how you are connecting your exhaust pipes to the turbine. I have a set of Tam's pipes and I'm not sure of the best way to connect them.
Thanks
Larry
Thanks
Larry
09-21-2014, 02:53 AM
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09-22-2014, 04:26 AM
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They are just regular hose clamps from the auto parts store. I can't remember the size, but around 2"-2.5". Just make sure your pipes are a "snug" fit around the turbine outlets. If they are Tam's and were built for the SPT5, then they should be a good fit.
09-22-2014, 06:17 AM
#11
Make sure they are clamps that can stand temperature. Did use some regular clamps in mine at first and after a couple of flights, they were done. The changed to ones than can stand high temperatures and never a problem again. I just make sure after a couple of flights that they are still tight by trying to move them a little bit. If they move, just tight them back a little bit.
