777 acceleration
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777 acceleration
Because I have never been on the new 777 I'd like to know, if you still get pushed into your seat by the acceleration or is it like the 747 which feels heavy and slow??
Also, is it true that the closer you are to the front of the plane the less acceleration you feel on takeoff than if you were right at the back of the plane??
Thanks a lot.
Also, is it true that the closer you are to the front of the plane the less acceleration you feel on takeoff than if you were right at the back of the plane??
Thanks a lot.
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Speedbird,
I’ll let someone qualified in the 777 speak to the specifics, but generally acceleration rates in the large twins will be greater, primarily because their thrust to weight ratios (all engines) are generally higher than 3 or 4 engine aircraft. This due to the fact that certification requires certain performance parameters to be met with an engine out. To have that performance goal met on a twin, by nature the aircraft needs to be (relatively) overpowered with both engines operating.
The feel (g’s) of acceleration should not vary from front to back, but the perception may be different if you are seated behind the (wing mounted) motors. Noise and vibration levels are increased in this case.
Hope this helps
I’ll let someone qualified in the 777 speak to the specifics, but generally acceleration rates in the large twins will be greater, primarily because their thrust to weight ratios (all engines) are generally higher than 3 or 4 engine aircraft. This due to the fact that certification requires certain performance parameters to be met with an engine out. To have that performance goal met on a twin, by nature the aircraft needs to be (relatively) overpowered with both engines operating.
The feel (g’s) of acceleration should not vary from front to back, but the perception may be different if you are seated behind the (wing mounted) motors. Noise and vibration levels are increased in this case.
Hope this helps
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Also, do the winglets of these heavy jets have ANY affect on accelerations, making them lighter??
Could you say the 777 is just as loud as the 747-400, because of the two large engines on the 777 and the 4 smaller engines fitted on 747-400's??
Thanks again
Could you say the 777 is just as loud as the 747-400, because of the two large engines on the 777 and the 4 smaller engines fitted on 747-400's??
Thanks again
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The winglet's main purpose is to minimise the "spillover" of air from underneth the wing (higher pressure) to the topside (lower pressure), it also reduces wingtip vortices this way.
When an airplane takesoff, wingtip vortices is not significant (ground effect) and the spillover is also not a major factor.
So imho, the winglets have negligible effect on the airplane's acceleration.
From a pax's point of view, a twin will sound louder than a 4-engine, simple logic, for a twin, all the noise of the engines are right next to the fuselage. As for the 4-engine, the noise from the engines is lower because the noise produced is split between the outboard engine (which is further from the fuselage) and the inboard engine !
Cheers.
When an airplane takesoff, wingtip vortices is not significant (ground effect) and the spillover is also not a major factor.
So imho, the winglets have negligible effect on the airplane's acceleration.
From a pax's point of view, a twin will sound louder than a 4-engine, simple logic, for a twin, all the noise of the engines are right next to the fuselage. As for the 4-engine, the noise from the engines is lower because the noise produced is split between the outboard engine (which is further from the fuselage) and the inboard engine !
Cheers.
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If you are lucky enough to takeoff in an empty B777 with Maximum Thrust, you will get pushed back into your seat, but unfortunately in order to save engine life, airlines reduce the amount of takeoff thrust to a minimum, therefore you will probably not see a difference.
Mutt
Mutt
