deaphen
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Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:36 pm

To start, i wanna say that this thread is NOT INTENDED TO START A FLAME between the twin lovers and the quad lovers. Personally i have flown both many times and i noticed a difference in the smoothness of the flight. I flew DEL-SIN then SIN-SFO on a SQ 772ER. I was petrefied of flying at that time and had a terrible time while flying to SFO. Mainly because the T7 was bumpy and very turbulant. Let me point out again, it is a personal view nothing more!! Anyways, on the way back, i flew VS from SFO to LHR then LHR to DEL, this was done on a A340 and 747. Since both are quads and i found them to be much smoother, i was much more relaxed on them. Any reason why there is such a difference? Agreed both machines are absolutely beautiful, but i want to hear comments on this from others and thei opinion on the subject.
Cheers
Deaphen
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jush
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:41 pm

Don't you think that your flight bumpiness had something to do with weather conditions and turbulences?
I reckon there is no such thing in a difference though i'm not a professional and i cannot explain it physically.
But i think modern twins or quads are all around the same thing in terms of smoothness.

Don't forget this is just an assessment and no fact i could be wrong.

Regds
jush
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cxsjr
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:43 pm

Never noticed it and have flown both two and four engines many times so the difference can't be that much either way? Talk to me about that fabulous fairground feeling when an MD11 levels at 5,000 ft on climb out, well that's a different matter!!
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ZKSUJ
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:44 pm

I too find the quads in particular the 744s the more stable, but then again I may have been blessed with smooth conditions whilst in those aircraft as opposed to other twins.
 
deaphen
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:44 pm

hey yea it could have been, but i have noticed that a few times after that too. Hence i ask  Smile Just curious.

Thanks anyways.
 Smile
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glideslope
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:45 pm

Quoting Deaphen (Thread starter):
To start, i wanna say that this thread is NOT INTENDED TO START A FLAME between the twin lovers and the quad lovers. Personally i have flown both many times and i noticed a difference in the smoothness of the flight. I flew DEL-SIN then SIN-SFO on a SQ 772ER. I was petrefied of flying at that time and had a terrible time while flying to SFO. Mainly because the T7 was bumpy and very turbulant. Let me point out again, it is a personal view nothing more!! Anyways, on the way back, i flew VS from SFO to LHR then LHR to DEL, this was done on a A340 and 747. Since both are quads and i found them to be much smoother, i was much more relaxed on them. Any reason why there is such a difference? Agreed both machines are absolutely beautiful, but i want to hear comments on this from others and thei opinion on the subject.
Cheers
Deaphen

I'd suggest a Land/Sea Ticket next time.  Smile
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deaphen
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:46 pm

Wouldnt the weight of the aircraft have anything to do with the bumpiness? ofcourse turbulance aside, u would expect a heavier plane (quad) to naturally be smoother than a twin..
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deaphen
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:49 pm

Quoting Glideslope (Reply 5):
I'd suggest a Land/Sea Ticket next time.

Lol haha.. i wouldnt mind.. how would that help tho ?  Smile
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deaphen
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:52 pm

Btw talking bout heavies... SQ will be the first to fly the A380 right? and i hear its going to be on their Sin-Syd route? correct me if im wrong.. how do i manage to get onto the first commercial flight?
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Grbld
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 6:58 pm

Quoting Deaphen (Reply 8):
Btw talking bout heavies... SQ will be the first to fly the A380 right? and i hear its going to be on their Sin-Syd route? correct me if im wrong.. how do i manage to get onto the first commercial flight?

Hey Deaphen, you're hijacking your own thread!  Smile

On topic, the bigger the aircraft, the more stable it flies through the same level of turbulence. The design of the airframe and wings, the amount of fuel in the wings (dampening factor) have more to do with how smooth if flies than the number of engines. The 747 airframe is completely different from the 777 airframe. For a good comparison, you'd have to compare the A330 and A340.

Grbld
 
FinnWings
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 7:13 pm

Being a professional pilot myself I can guarantee that there is hardly any correlation of the number of engines and smoothness of flight. Generally speaking you can say that heavier aircraft is more stable at least what comes to the effect of wind. Things which influence more for your travel experience is the weather and location where you are seated on board. Near the center of gravity (slightly aft of wing leading edge) the relative movement of aircraft is less than in the aft or nose of the aircraft. Especially yawing motion is sometimes very easily noticeable in the aft.

To make things simple, try to take a pen and keep it level and balanced between your fingers from the halfway. Now, moving the pen every direction you can see that the pen is moving faster further away from the point where you are touching it. In a real life your aircraft is exactly like a pen but a little bit longer.  Smile

On the technical side the overall design of the wing has a little bit effect for the smoothness of the ride as well and how the wing behaves in turbulence. Some of these are load factor of the wing, flexibility, sweep angle etc...

I hope this helps!

Best Regards,
FinnWings
 
Glareskin
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 8:36 pm

The 777 flies smoothly in turbulence skies too. Subjectively you might experience the A340 smoother in the same air because of the lower noise levels in the cabin. Objectively this has nothing to do with how smooth it moves through the air.....

But in order of handling your fear of flying in turbulent weather. In general you could say that big widebodies are not as sensitive to winds and turbulence as smaller aircraft.
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deaphen
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RE: Smoothness Of Flight On The Twin V/s Quad

Wed Dec 21, 2005 10:37 pm

Quoting Glareskin (Reply 11):

The 777 flies smoothly in turbulence skies too. Subjectively you might experience the A340 smoother in the same air because of the lower noise levels in the cabin. Objectively this has nothing to do with how smooth it moves through the air.....

Well to be honest, i did feel a significant difference between the 340 and the 777.
I dont think it has anything to do with cabin noise.
Though the 777 is definately fun to fly on being so technologically savy!
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spacecadet
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RE: Smoothness Of Flight On The Twin V/s Quad

Thu Dec 22, 2005 4:56 am

It's not logical that a four-banger would be smoother than a two-banger. A four-engine a/c is obviously creating twice as many eddies behind its engines as a two-engine a/c, and those eddies are closer to the airplane's fuselage. I don't know where you sat in both of the four-engine planes you flew on, but sit in the back of a 747 sometime - it's an adventure, even in smooth skies. There's an almost constant vibration back there, any minor turbulence gets amplified, and the yaw dampers kick in pretty violently at times.

A two-engine aircraft should be smoother, all else being equal. If it wasn't for you, it's got more to do with the specific conditions you were flying through and your seating position than anything else.

I'd rather fly on a four-engine plane than a two-engine plane over any distance, but I don't think they're any smoother. The overwing section of a 747 is naturally smoother than most planes because it's a bigger airplane, but it's got nothing to do with the number of engines. The front of a 747 usually seems to *feel* smoother because you don't get any engine noise or vibration at all, really, though actual turbulence is a bit greater than it is over the wings.
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