November 05, 2015

Know How... 168: Geared Turbofan, WinDroid, & Google History

57 minutes

Pratt & Whitney's new Super Engine

Modern aircraft are all about the turbofan engine

The Turbofan combines massive amounts of power, with decent efficiency and impressive reliability.

Even the non-exotics are amazing works of engineering

Here's how a traditional turbofan works:

A Jet engine compresses air, adds fuel, burns it, then is thrusted forward by the expansion of exhaust gasses

A "Fan" moves huge amounts of air, thrusting itself forward (Think of the props on a Quadcopter)

A Turbofan combines the two: a HUGE fan in front of, and drive by a jet engine

In a modern high-bypass turbofan you have:

The Fan

The low-pressure compressor

The High pressure compressor

The Combustion chamber

High pressure turbine

Low pressure turbine

Here's the key

The low pressure turbine is connected by a shaft to the low pressure compressor and fan

The high pressure turbine is connected to the high-pressure compressor

So, as the gasses and burned and expanded, they provide the power to the fan and compressors that allow for the gasses to be burned and expanded.

This is a good system... but the folks at Pratt and Whitney just made it obsolete!

The Pratt & Whitney "PurePower" Geared Turbofan

They burn 16% less fuel for the same thrust

They put out less NOX for the same thrust

The create 75% less noise while on the ground

It cost 30 years and $10 billion to make them work

Why is it so much better?

Let's talk about propellors.

Small props that spin quickly, vs large props that spin slowly

Large is more efficient, and less noisy

But we wouldn't use larger fans on Turbofans because the speeds as which you needed to spin the shaft for the compressors was spinning too fast for the ideal-sized fan.

So... P&W added a gear box (It's 20 inches in diameter and weighs 250lbs)

They used a orbital gear design to step down the speed of the low-pressure turbine/compressor shaft.

This allows the fan to spin much more slowly, but with far more torque

Slower speeds with more torque means they can use a more aggressive fan that moves more air at lower speeds.

While a traditional turbofan might have a 5:1 bypass... PurePower does 12:1

So... more efficient, more thorough burn (less pollutants), and MUCH quieter on the ground.

WinDroid & Google History

AMIDuOS!

Created by AMI - "American Megatrends - The company that so many of us know from their BIOS days"

They were founded in 1985 by Pat Sarma and S. Shankar (who will be on Triangulation in the future)

Their first customer was "PC's Limited" which became "Dell Computers"

But this is DuOS...

Unlike "Bluestacks" which is an Android App Emulator, DuOS is full-Android in either a VM or a Container

It gives FULL access to all the major peripherals (this was a major problem with emulators)

Keyboard, Mouse, touchscreen, microphone, ambient light sensor, accelerometers, compass, orientation, etc.

It also supposed variable screen sizes.

Notes:

There are two versions: AMIDuOS 1.1 (Running Android Jellybean) and AMIDuOS 2.0 (Running Android Lollipop)

Jellybean will cost you $10 // Lollipop will cost $15

Once you install, you WILL need to install Google Apps and Services

Let's talk about what Google stores in your online history

Websites

Voice Commands/Searches

Connected Devices

Location History

YouTube Video History

YouTube Search History

Feedback

These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/168

Hosts: Fr. Robert Ballecer, SJ and Bryan Burnett

Sponsors:

lynda.com/knowhow

holhom.com/twit

...more

View all episodes

By TWiT

44 ratings

November 05, 2015

Know How... 168: Geared Turbofan, WinDroid, & Google History

57 minutes

Pratt & Whitney's new Super Engine

Modern aircraft are all about the turbofan engine

The Turbofan combines massive amounts of power, with decent efficiency and impressive reliability.

Even the non-exotics are amazing works of engineering

Here's how a traditional turbofan works:

A Jet engine compresses air, adds fuel, burns it, then is thrusted forward by the expansion of exhaust gasses

A "Fan" moves huge amounts of air, thrusting itself forward (Think of the props on a Quadcopter)

A Turbofan combines the two: a HUGE fan in front of, and drive by a jet engine

In a modern high-bypass turbofan you have:

The Fan

The low-pressure compressor

The High pressure compressor

The Combustion chamber

High pressure turbine

Low pressure turbine

Here's the key

The low pressure turbine is connected by a shaft to the low pressure compressor and fan

The high pressure turbine is connected to the high-pressure compressor

So, as the gasses and burned and expanded, they provide the power to the fan and compressors that allow for the gasses to be burned and expanded.

This is a good system... but the folks at Pratt and Whitney just made it obsolete!

The Pratt & Whitney "PurePower" Geared Turbofan

They burn 16% less fuel for the same thrust

They put out less NOX for the same thrust

The create 75% less noise while on the ground

It cost 30 years and $10 billion to make them work

Why is it so much better?

Let's talk about propellors.

Small props that spin quickly, vs large props that spin slowly

Large is more efficient, and less noisy

But we wouldn't use larger fans on Turbofans because the speeds as which you needed to spin the shaft for the compressors was spinning too fast for the ideal-sized fan.

So... P&W added a gear box (It's 20 inches in diameter and weighs 250lbs)

They used a orbital gear design to step down the speed of the low-pressure turbine/compressor shaft.

This allows the fan to spin much more slowly, but with far more torque

Slower speeds with more torque means they can use a more aggressive fan that moves more air at lower speeds.

While a traditional turbofan might have a 5:1 bypass... PurePower does 12:1

So... more efficient, more thorough burn (less pollutants), and MUCH quieter on the ground.

WinDroid & Google History

AMIDuOS!

Created by AMI - "American Megatrends - The company that so many of us know from their BIOS days"

They were founded in 1985 by Pat Sarma and S. Shankar (who will be on Triangulation in the future)

Their first customer was "PC's Limited" which became "Dell Computers"

But this is DuOS...

Unlike "Bluestacks" which is an Android App Emulator, DuOS is full-Android in either a VM or a Container

It gives FULL access to all the major peripherals (this was a major problem with emulators)

Keyboard, Mouse, touchscreen, microphone, ambient light sensor, accelerometers, compass, orientation, etc.

It also supposed variable screen sizes.

Notes:

There are two versions: AMIDuOS 1.1 (Running Android Jellybean) and AMIDuOS 2.0 (Running Android Lollipop)

Jellybean will cost you $10 // Lollipop will cost $15

Once you install, you WILL need to install Google Apps and Services

Let's talk about what Google stores in your online history

Websites

Voice Commands/Searches

Connected Devices

Location History

YouTube Video History

YouTube Search History

Feedback

These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/168

Hosts: Fr. Robert Ballecer, SJ and Bryan Burnett

Sponsors:

lynda.com/knowhow

holhom.com/twit

...more

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More shows like TWiT Throwback (Audio)

Total Leo (Audio)

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