Excellent thread. I don't know my azz from a tree trunk when it comes to turbines. I am enjoying learning.
Eddie
Thread: turbine boat question??
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01-28-2010 03:00 AM
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01-28-2010 11:56 AM
Yes, Good Batteries required. I think the Wet Start vid. i posted might have been from this reason .
Here's Gerry on a start up vid. that i took in Fairhaven Ma..
http://www.youtube.com/watch?v=oG2DxMmKj3g
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01-28-2010 02:19 PM
You will know when you turn the key on.
The first you do is look at your voltage on that motor.
I wired it off a Standard marine key switch.
Position 1. Key on. Energizes, The fuel cut off solenoid. All gauges on.
Position 2 (Crank motor for piston application) energizes the start fuel
solenoids. In the event of a hot start this portion of the switch is spring
loaded you simply let go and it shuts down the xtra start fuel.
I have a completely independent momentary switch for the spool.
This is in the event of a start issue you can continue spooling cooling the
motor.
A start takes approx 20 seconds.
No warm up period once there lit there ready to Rock.Last edited by KnotRight; 01-28-2010 at 02:41 PM. Reason: issues
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01-28-2010 04:58 PM
anyone watch the discover ch a few years ago when some guys took the wings off a star fighter and were going to try for land speed attempt. during trying to fire it up after several trys they hot started and melted all the blades you could see them coming out the back it a great vid but i can,t find it it was a big engine j7 maybe? anyone else watch it? sometimes it was painful to watch!
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01-28-2010 06:25 PMThat was the North American Eagle LSR project.
The F104 had a single a GE J-79 engine. The F-4 used two and the B-58 used four of them.
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01-28-2010 06:39 PM
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01-28-2010 06:42 PM
Here's the warm up process
http://www.youtube.com/watch?v=khnqr...eature=related
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01-28-2010 06:53 PM
No Chris the oil temperature in flight service according to the military
manual reads no minimum oil temperature warm up is required to achieve takeoff power. It does however give specifics about a over temp which
it reads anything over 93celcius write up required.
However I would consider some type of oil temp one would think
would be beneficial. I know I would never push my big blocks without some nice hot oil. The bearings are rollers and the seals carbon faced
which actually require oil and or compressor pressure on certain sides to seal properly.
One particular starting event I had was I had a seal actually stick and almost completely empty my sump tank The engine lit up and the pyro climbed
and there was a huge yellow flame which I think could have been viewed
from space. I shut her down and added 7 quarts and it never happened
again.
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01-28-2010 08:24 PM
http://www.vimeo.com/7379666 about 3/4 in the hot section is glowing red anyone seen that before?
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01-28-2010 08:52 PM
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01-28-2010 09:47 PM
i think your right rik its just the way light hits it
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01-28-2010 10:05 PM
Here is the Starter/ Generator as Rik stated it doubles as a generator.
There are two versions of these a 200amp and a 300amp.
I paid 2500 each for these off a guy who bought 5000 of these off the
Army
The three polls fit a 00 lug one is ground, one is crank windings and the third
is Generator. Look closely you will see the exciter little #10 lugs.
When you put B+24 to this it will produce up to 300amps respectively.
This runs with the N1 system off a right angle drive and is always engaged.
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01-28-2010 10:15 PM
Here is a picture out of my Student workbook that shows the
N1 and N2
N1= purple... Gas producer
N2= red .... Power Turbine
Note the bottom of the n1 with the studs on the right angle
that is where the Starter mounts.
SCS makes a right angle drive that will locate that above the engine for easy
Access.
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01-29-2010 12:33 AM
Luckily, the Lycomings have a starter generator. The T-58's don't have this nor do some of the others other there. Try attaching a 400 amp alternator to an engine that has no pulleys
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01-29-2010 06:19 PM
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01-29-2010 07:31 PMI saw a setup on a very early turbine rig where they were running an alternator and a water pump off of the output shaft. They had a pulley in between the shaft couplings.