GEnx - Boeing 787 and Boeing 747-8 Aircraft Engine

Boeing 787 and Boeing 747-8 Jet Engine GEnx


Image from: - Wikimedia




The GEnx is the fastest-selling jet engine in the world. It's a high-thrust jet engine manufactured by GE Aviation. GEnx-1B powers Boeing 787 Dreamliner and GEnx-2B powers four-engine Boeing 747-8.

GEnx-2B Boeing 747-8 Aircraft engine Assembly Timelapse




Video from: - GEaviation

GEnx engine is based on GE90 architecture. GEnx offers up to 15% improvement in fuel efficiency and produces 15% less CO2 as compared to GE’s CF6 engine. The GEnx engine uses the advanced materials and design processes to reduce engine weight. This improves engine performance and increases fuel efficiency of commercial aircraft.


(GEnx-2B Engine on Boeing 747-8)
Image from: - Wikimedia

Both front fan case as well as fan blades of GEnx engine are made up of carbon fibre. GEnx is world's first jet engine to use carbon fibre for both front fan case as well as fan blades.  Fan blades made up of  carbon-fiber composite make GEnx more efficient in design and further reduces weight. And also it a reduces blade count from 22 to 18 fan blades.


(GEnx-1B Engine on Boeing 787)
Image from: - Wikimedia

The low-pressure turbine of GEnx engine is light weight and more efficient. 6th and 7th stage of GEnx is made up of titanium aluminide. This reduces engine weight by approximately 400 lbs 181.437Kg. and increases fuel efficiency of the GEnx engine.

GEnx Engine Specifications



Data from: - GEaviation

GEnx Overview


Video Credits: - GE aviation



Data Source: - GEaviation





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Why do some aircraft have rounded nose while some have pointed nose?

Why do some aircraft have rounded nose while some have pointed nose?

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Take a look at any modern passenger aircraft. You will see almost all of them have rounded (blunt shaped) nose.

Take a look at some of these aircraft!

Airbus A380

Image from: - wikimedia

Boeing 747

Image from: - wikimedia

All of them are having rounded nose. And all are subsonic aircraft. (Speed less than speed of sound i.e. < 1 Mach)

Now take a look at these aircraft!

Concorde

Image from: - wikimedia

Tupolev TU 144

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These aircraft are having cone shaped nose. These cone shaped aircraft have a common thing among them. That's both are supersonic passenger aircraft. Supersonic aircraft are those which travel faster than speed of sound (i.e. > 1 Mach)

In a case of subsonic aircraft, most of aircraft have rounded nose. As aircraft travels with subsonic speed it pushes air molecules in front of it. And these air molecules starts moving and again pushes other air molecules infront of it. This creates pressure field in front of aircraft and indicates air molecules that aircraft is coming. So air molecules be ready for impact with aircraft without any production of shock.

But in a case of supersonic aircraft with rounded nose, speed of aircraft is so high that air molecules do not get any indication of coming aircraft. Aircraft suddenly impacts air molecules. This causes production of shock. This shock produces huge amount of drag. To reduce such type of drag, nose of supersonic aircraft are cone shaped. A pointed nose is more aerodynamic in supersonic flow.

This is the reason most of supersonic aircraft have pointed nose.

F22 Raptor

Image from: -wikimedia

F35 Lightning

Image from: - wikimedia

In case of subsonic aircraft with rounded nose, speed is not so high for production of shocks. Instead cone shaped nose at subsonic speed causes increase in skin friction drag.  Hence cone shaped nose is not used in subsonic aircraft. A shape with a round front is more aerodynamic in subsonic flow than a pointed nose.

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Why is an airplane nose up while landing?

Why is an airplane nose up while landing?

Image from: - wikimedia

If you observe an airplane landing carefully you will see that while landing pilot keeps aircraft nose up.
Why do pilot keeps aircraft nose up while landing?
Let's find it out!

Here are the reasons!

1. To land on main Landing gear

Image from: - wikimedia

Most of the aircraft has main landing and nose landing gear. Main landing gears are located near to the Centre of Gravity (CG) of an aircraft. So it helps aircraft to land safely without any unnecessary torque. Main landing gears are generally intended to support most of the weight of the aircraft.

Image from: - wikimedia

Nose landing gears are not so strong to carry whole aircraft weight. Nose landing gears are used just to support front fuselage of an aircraft. This is the reason why aircraft are landed on main landing gear.

2. Slow touch down

Image from: - wikimedia

Even if main landing gears are inteded to support most of weight of an aircraft, direct touch down without slowing down aircraft can damage main landing gear & cause crash. So by moving aircraft nose up pilot increases angle of attack of wings. This increases lift to aircraft and slows down aircraft. This prevents damages. To know more about production of lift check out my this post.

3. To avoid aircraft nose from damage

Image from: - wikimedia

Landing an aircraft without moving nose up can possibly damage aircraft nose & crash. This is one of reasons to keep aircraft nose up.

4. Ready for any landing problem

Image from: - wikimedia

If any problem caused during landing then pilot can simply take off again start landing procedure again.

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