1. Size comparison between Eagle & Bombardier Global 8000.
Eagle is the most frequently used animal to represent the coat of arms of royal families and countries because of its majestic status among the animals. That is the reason this Y-fuselage aircraft concept is called, "Eagle" too - to signify its majesty as a luxury jet. In term of size, Eagle has the wingspan and length that are almost the same as that of Bombardier Global 8000 large executive jet.
2. Top view of Eagle: Notice the signature arch tail fin and the centerline turbofan.
The wing root of Eagle's main wing is attached to the lower part of its rear twin fuselages, with a canard attached to its front fuselage. It has a signature "arch tail fin" and powered by a single centerline turbofan.
The turbofan is housed inside a nacelle well at the rear of the cabin so as avoid engine's noise to be heard inside the cabin. Being outside and rear of the cabin and also between the rear-end of the twin rear fuselages is a very secured position for the engine and safe for early ignition because the engine is fully concealed from the boarding passengers.
The turbofan is housed inside a nacelle well at the rear of the cabin so as avoid engine's noise to be heard inside the cabin. Being outside and rear of the cabin and also between the rear-end of the twin rear fuselages is a very secured position for the engine and safe for early ignition because the engine is fully concealed from the boarding passengers.
3. Side view of Eagle: Notice the arch tail fin.
Viewed from the side, Eagle's turbofan is not visible, concealed by the twin rear fuselages. The cones of these fuselages are actually the cones of the propellers of twin electric secondary power units (SPUs). The SPUs are purposely activated for economic mode flight or automatically activated when the single turbofan fails. Thefore the SPUs not only reduce the operational cost of Eagle, but also significantly increase the operational safety of the luxury aircraft.
4. Front view of Eagle: Notice the arch tail fin.
Viewed from the front, the signature arch tail fin is very visible. The tail fin not only stabilizes Eagle when in flight, but also assists in providing lift to the rear fuselages due to its unique design.
5. Bottom view of Eagle: Notice the centerline intake of the turbofan.
The intake for the turbofan is at the bottom, but at the same level with the bottom surface. This optimizes the aerodynamics compared to having an inlet protruding below the bottom surface.
6. Eagle with comfortable seating configuration for 90 passengers and 5 crews. The turbofan and twin APUs are made visible.
Eagle can carry up to 100 passengers, but a 90-seat passenger configuration will be a very comfortable one. In such configuration, the aircraft also accommodate 4 toilets for passengers and one for the pilots. Each SPU has a propeller with foldable blades and telescopic shaft.
7. Eagle in a luxury configuration with 2 bedrooms and a meeting room for 19 passengers - a suitable configuration for a royal family or VVIP delegation. The turbofan and twin SPUs are made visible.
The clear advantage of Y-fuselage is the wide fuselage that allows compartmental interior, including bedrooms. A possible luxury interior is to have 2 bedrooms each directly at the front of each SPU. Each bedroom has a queen size bed and a lobby with a secretary workstation. This luxurious interior is only possible with Y-fuselage aircraft. A conventional fuselage aircraft is not capable of it.
Such interior can accommodate 19 passengers, each with a proper aircraft safety seat and a meeting room for 10 people. The safety seats are for the passengers to sit when the aircraft fly through turbulence as each seat is equipped with all the safety features including seat belt, life jacket and safety kit. There are even 2 safety seats inside each bedroom.
Y-fuselage aircraft will promote aircraft interior design. It will provide great opportunity for interior architects to contribute their creativity into aircraft design and engineering for the production of better, more comfortable and safer aircrafts. This will be a significant increment in human factor engineering in aviation.
Such interior can accommodate 19 passengers, each with a proper aircraft safety seat and a meeting room for 10 people. The safety seats are for the passengers to sit when the aircraft fly through turbulence as each seat is equipped with all the safety features including seat belt, life jacket and safety kit. There are even 2 safety seats inside each bedroom.
Y-fuselage aircraft will promote aircraft interior design. It will provide great opportunity for interior architects to contribute their creativity into aircraft design and engineering for the production of better, more comfortable and safer aircrafts. This will be a significant increment in human factor engineering in aviation.
8. The automatic activation of the SPUs starts with the extension of their telescopic propeller shafts.
When the turbofan fails, automatically the SPUs activate. This activation starts with the extension of the telescopic propeller shafts of each SPU.
9. The blades unfold tangentially to the shafts after the shafts are fully extended.
After the shafts are fully extended, the blades unfold tangentially to the shafts. This is possible because the extension of the shafts has cleared the blades to be unfolded.
10. The blades are retracted inward and the propellers rotate to produce the thrust required to compensate the lost thrust due to the failed turbofan.
After the blades are fully unfolded tangential to the shafts, the shafts are retracted inward to bring the blades closer to the fuselage to exterminate the drag that might has occurred if the blades remain at a distance. The propellers then rotate to produce the thrust required to compensate the lost thrust due to the failed turbofan. Both propellers rotate at opposite direction for torque cancellation.
The SPUs can also be purposely activated for economic flight mode. However, Eagle can only take off or landing using the turbofan because when fully unfold, the diameter of the blades of the SPU propellers is too big to allow clearance from the runway.
The concept of electric SPU with foldable blades and telescopic shaft opens up a new operational methodology for aircrafts equipped with such power unit. An interesting methodology is to use electric SPU for nearspace flight and turbofan for lower altitude flight, as electric propulsion is more effective than turbofan at nearspace altitudes. A concept of nearspace RF (reconnaissance-fighter) aircraft powered by a turbofan and twin electric SPU is described in a following chapter.
Another advantage of Y-fuselage aircrafts is they can carry a big logo on top or at the bottom of their fuselages, as they have relatively very wide fuselages. At the time of writing this chapter, my family is waiting for a German high school student who is coming to stay with us for a week on an Italian-German exchange student program, which our son participates. And since the German Coat of Arms is properly an eagle, I colored the following Eagle with the German national color and pasted the German Black Eagle on its fuselages.
11. Illustration of Eagle in German national color with German Coat of Arms.
DISCLAMER
1. The illustration of Bombardier Global 8000 in figure 1 is from a public website.
2. The illustration of German Coat of Arms in figure 11 is from a public website.
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