@Dc9fan That is the compressor bleed valve on the start cart opening to allow air to be fed to the starter on the big engine. The start cart is a small turbine engine, and it has to get up to 104% rpm before it will allow its bleed valve to open. The actual noise you hear when this happens is from the exhaust of the air turbine starter.
@digitalblue9000 This engine is usualy started in its installation by a hydraulic motor connected to the main rotor at the front.
For our test we designed and built a torque tube mount so we could use the air turbine starter from a GE LM1500. It has internal reduction gearing and worked well.
@digitalblue9000 When you first see the starter at 2:22... the air hose from the start cart has already been disconnected by Moto-Steve. He's super fast and efficient.
Great work here and lovely sounds. Question, do you know what the max oil pressure was for this mark of Avon? I see it sitting about 42 around 3000+ rpm; any idea if this increased significantly at 7000+rpm?
@nazcasteve Actually, we are running the Avon external gearbox by an electric motor running at constant speed. The engine's oil pump is driven by the gearbox so we are turning the oil pump at the speed it would be turning if the engine was at 7,000 rpm.
I can't hear it...I have my full acustic, dual blastic speakers on full blast and still can't hear it...wait a min, my speaker cable came loose, let me connect it..........................WOWHOLY SHIT$@#*@#*@#_)(*!!!!!!!!
@daleng1994 Ha! That's my favorite comment of all!
To be there live, the noise is not possible to describe. I've never seen a rocket launch in person, but I bet it is the only thing that is louder than being 20 feet from a full-power jet engine on a test stand.
@AgentJayZ I was just kidding what I said... I am an aircraft engine repairer in the Army and I work on turbine engines everyday for the Army's helicopters. After any maintanence task we have to check the engine for any fluid leaks while the eng is at 100% power which means "LOUD NOISE" !!!!!!!!! HUH?
Each blade is attached to the disk by a pin, much like a piston wrist pin, that passes through a hole in the tab at the base of the blade, as well as a hole in each rim of the disk, on either side of the tab.
The blades move around at very low engine speeds, but are locked in position by centrifugal force at any engine speeds even approaching starting RPM.
Those holes are for the anti-ice air which flows into the IGVs from their outer edges to leak out of.
This engine is not equipped for anticing, but if it was, there would be a large external pipe from the Compressor Outlet Casing to the Front Bearing Housing.
The COC is the brownish "waist" of this engine, and the FBH is the silverish band at the front.
Even in freezing cold weather, the air from the back of the compressor can be over 400 degrees F.
what is the sound at 0:17
Dc9fan 6 months ago
@Dc9fan That is the compressor bleed valve on the start cart opening to allow air to be fed to the starter on the big engine. The start cart is a small turbine engine, and it has to get up to 104% rpm before it will allow its bleed valve to open. The actual noise you hear when this happens is from the exhaust of the air turbine starter.
I have posted a video of this starter in action.
AgentJayZ 6 months ago
i just to work on this engine i work for rolls royce canada
what engine very easy to work on good souvenirs
cachorro1961 10 months ago
2:49 Yes, please show me turbine inside
interruptorLT 1 year ago
tnks!
digitalblue9000 1 year ago
AgentJayZ : Thank you! Now i know. have a nice day.
digitalblue9000 1 year ago
Where is STARTER in this angine? I can't see it?
digitalblue9000 1 year ago
@digitalblue9000 This engine is usualy started in its installation by a hydraulic motor connected to the main rotor at the front.
For our test we designed and built a torque tube mount so we could use the air turbine starter from a GE LM1500. It has internal reduction gearing and worked well.
It comes into view at 2:22.
It is fed air at 25 - 30 psi from the yellow start cart.
Other Avons are electric start, and I have some vids of those posted.
AgentJayZ 1 year ago
@digitalblue9000 When you first see the starter at 2:22... the air hose from the start cart has already been disconnected by Moto-Steve. He's super fast and efficient.
AgentJayZ 1 year ago
@dubravajecentar Gee, that should be obvous by your avatar...
AgentJayZ 1 year ago
Great work here and lovely sounds. Question, do you know what the max oil pressure was for this mark of Avon? I see it sitting about 42 around 3000+ rpm; any idea if this increased significantly at 7000+rpm?
Cheers,
Steve
nazcasteve 1 year ago
@nazcasteve Actually, we are running the Avon external gearbox by an electric motor running at constant speed. The engine's oil pump is driven by the gearbox so we are turning the oil pump at the speed it would be turning if the engine was at 7,000 rpm.
So what you are looking for is right here.
AgentJayZ 1 year ago
@AgentJayZ Perfect, very helpful, thanks a lot.
nazcasteve 1 year ago
I can't hear it...I have my full acustic, dual blastic speakers on full blast and still can't hear it...wait a min, my speaker cable came loose, let me connect it..........................WOWHOLY SHIT$@#*@#*@#_)(*!!!!!!!!
daleng1994 1 year ago
@daleng1994 Ha! That's my favorite comment of all!
To be there live, the noise is not possible to describe. I've never seen a rocket launch in person, but I bet it is the only thing that is louder than being 20 feet from a full-power jet engine on a test stand.
AgentJayZ 1 year ago
@AgentJayZ I was just kidding what I said... I am an aircraft engine repairer in the Army and I work on turbine engines everyday for the Army's helicopters. After any maintanence task we have to check the engine for any fluid leaks while the eng is at 100% power which means "LOUD NOISE" !!!!!!!!! HUH?
daleng1994 1 year ago
@daleng1994 Still, ... the best comment ever.
AgentJayZ 1 year ago
@AgentJayZ Hi there... My eyesight is still good..!!!!
daleng1994 1 year ago
at 5:12 whats the grinding noise it sound like the blades are lose
TheLaurencekid 2 years ago
The blades are loose in a way.
Each blade is attached to the disk by a pin, much like a piston wrist pin, that passes through a hole in the tab at the base of the blade, as well as a hole in each rim of the disk, on either side of the tab.
The blades move around at very low engine speeds, but are locked in position by centrifugal force at any engine speeds even approaching starting RPM.
AgentJayZ 2 years ago
Just love your videos. What are the small holes for in the inlet guide vanes? Thanks as always.
102trafalgar 2 years ago
Good eye!
Those holes are for the anti-ice air which flows into the IGVs from their outer edges to leak out of.
This engine is not equipped for anticing, but if it was, there would be a large external pipe from the Compressor Outlet Casing to the Front Bearing Housing.
The COC is the brownish "waist" of this engine, and the FBH is the silverish band at the front.
Even in freezing cold weather, the air from the back of the compressor can be over 400 degrees F.
AgentJayZ 2 years ago
Another great video. 5*s.
Wolfie123123 2 years ago