Add to EJ Playlist A discussion about how the term " bleed air" is used to describe not just one thing, but a variety of sources and destination for air that leaves the compressor upstream of the nominal compressor outlet.
Add to EJ Playlist In this episode :
1) Reasons for loose mounts of turbine and compressor blades
2) Are there industrial uses for turbofan engines ?
3) Older designs had allowable limits for cracks in the hot section. Do newer ones ?
4) Vibration measurement and monitoring in aircraft and our test cell.
5) Do airliners always fly at full power? What about efficiency at part throttle ?
Add to EJ Playlist Hey, we've hit 20 !
This time, let's talk about:
1) Bearing life expectancy
2) Coke and soot deposits in the engine
3) Fuel nozzle spray pattern
5) How does our start cart work.
Add to EJ Playlist Let's talk about
1) - Water getting into the engine
2) - Running out of fuel
3) - What's that steel box next to the engine in the test cell ?
4) - What's that yellow thing on wheels ?
5) - Why do newer, more powerful engines have smaller combustors?
Add to EJ Playlist This time:
1) - What shape is the duct between the GG and the PT in an industrial installation.
2) - Why the power is concentrated right near the top of the operational speed range.
3) - What the heck is that big white thing on the front of the engine...?
4) - Do I try to recognize all those sounds heard in an airliner while travelling...
Add to EJ Playlist A trip to the FSJ Air Show... which leads to some video of some other adventures this summer.
I even call a Wright R-2600 a Curtiss... Well, for a time, the company was called Curtiss-Wright.
Add to EJ Playlist In this episode, we talk about:
1) how the power is used in a jet engine
2) how the main shaft is supported in a turbine engine
3) How jet thrust is created
4) How everything is arranged to make a turbofan
Add to EJ Playlist The same engine featured in Afterburner vs Grass, this time at full military power.
Some parts were replaced, and the fuel control system had to be readjusted, so we're doing that and testing that.
Add to EJ Playlist When we want to move an engine farther than down the block to our test cell, this is how we do it.
This is an LM1500 going into it's matching container for long distance shipping. Each type of engine has it's own custom-fitted container. They are not universal or interchangeable between different engine types.
Add to EJ Playlist This time:
1) Lubrication of a windmilling turbofan on a parked airliner.
2) Exceeding the limits imposed by the fuel control
3) Aircraft bolts vs regular bolts
4) FCU adjustments on the test stand
5) N1, N2... what does that mean ?
Add to EJ Playlist In San Carlos, just south of San Francisco, the Hiller Museum has a lot of aircraft that you are allowed to touch, and some you shouldn't. They offer computer flight simulator sessions, and access to their restoration shop. There is an engine display area, containing a few jets, but many early radial piston engines.
Add to EJ Playlist This time, We talk about
1) Engine shipping containers
2) Ways that modern engines are more efficient than older ones
3)How we lift and move the engines in our shop
4)How hot do turbine blades get?
5) Does the exhaust in the race boats push the boat down ?
Add to EJ Playlist On the test day, we ran the engine for a total of about 45 minutes. We started and shut it down several times, made a few adjustments, and ran it at various power levels.
This clip is edited out of the parts of all of those runs that I was able to capture.
We fuelled it with propane vapor, which is a convenient substitute for natural gas, because we can store the liquid propane in a large tank, and vaporize it as we need it.
To deliver natural gas in quantity to fuel the engine, we would need to build a pipeline to our test cell.
Add to EJ Playlist It takes some work to get an engine ready for a test run, so we're going to visit Walter and Bill in our test cell, as they prepare the Rolls Royce Spey. It's a two-shaft industrial engine, that makes almost 20 thousand Hp, but is much more fuel efficient than the earlier RR Avon or our most common engine, the GE LM1500.
Add to EJ Playlist This is how we transport the engines we build to our test cell, which is about 1Km away from our shop. Thanks to Walter, Lane, and Electron Bill for allowing me to put them on camera.
Special thanks to Lane for building the engine.
Add to EJ Playlist Today, after nearly nine months of work, we put our Orenda type 14 engine into the horizontal test stand. A few accessories to mount in the front, and she'll be ready to test.
This engine will be mated to the airframe of a Canadair Sabre 6 currently undergoing restoration at the Planes of Fame museum in Chino California.
That airframe is featured in my recent video called "A Sabre and its Engine"
Add to EJ Playlist This time, we talk about:
1) Old vs. new ways of controlling gas turbine engines
2) The sleek outside vs. the complicated inside
3) That amazing roar of an airliner climbing after takeoff
4) EGT at full power and in afterburner, for engines so equipped
5) The ways ball bearing and roller bearings work
6) BONUS: does tolerance stack affect engine dimensions, and what does that mean
Add to EJ Playlist "Even a video on O-rings will do"... so says Youtuber Nissim Einat.
Well... be careful what you wish for...
This is a real training video, and shows the correct way to handle O-ring seal installation, as specified by the manufacturers of aviation gas turbine engines.
Add to EJ Playlist Two turbine engine powered race boats do some testing on the lake. These boats normally race on river courses, so a nice calm lake is a piece of cake, but we're just doing a quick test of the setup before heading off to race.
Maximum speed is not the goal here, but both boats went just over 125 MPH on this day.
Add to EJ Playlist Things we discuss today:
1) - P&Ws new geared turbofan
2) - Energy wasted during a test run
3) - Combustor liner metallurgy
4) - Combustor interconnectors and their function
5) - How the back of a Sabre jet is attached to the front
Add to EJ Playlist OK, everybody... time for a bit of tough love. This video is in response to all the people who share a very common misunderstandin g about how jets work.
More than that, this is especially directed at those who feel the need to spread their misunderstandin g by "explaining" it to others.
Let's all do our part to help these people learn how things really work.
Add to EJ Playlist Questions we talk about today:
-1) Engine mounts in the airframe.
-2) Temperature profile of the rpm range
-3) Examples of turbine blade damage
-4) Gyroscopic forces of the engine affecting aircraft handling
-5) How the oil system handles air bubbles and inverted flying
Add to EJ Playlist Here is a quick look at the starter ratchet clutch from a Rolls Royce Avon.
With some engines, the clutch is built into the starter. In the Avon, it's part of the engine's starter drive mechanism.
Add to EJ Playlist This time I try to talk about:
1) - where the thrust acts on the engine...
2) - how to polish a titanium blade..
3) - tamper-evident lead seals, a.k.a. birdshit...
4) - scrapped turbine parts...
5) - variation between compressor stages...
6) - Bonus!! the Turbinophone being built for Burning Man...