Ual747 From , joined Dec 1969, posts, RR: Posted (9 years 7 months 3 weeks 9 hours ago) and read 3314 times:
Around 1997 I flew on an L-1011 from DFW-ATL. I remember right after take off, the plane just started shaking. It wasn't turbulence, but the whole plane was vibrating for a short while. Someone once tried to explain that perhaps it was the smooth flow of air over the wing trying to detach itself, but I don't remember exactly. Any answers?
Type-rated From United States of America, joined Sep 1999, 4849 posts, RR: 19
Reply 3, posted (9 years 7 months 3 weeks 9 hours ago) and read 3266 times:
I remember flying on TW and DL's L10's. It seemed that while you were on takeoff roll everything would shake! Side panels, overhead light fixtures, etc. And it would be a most visible shake too! It would stop within seconds of liftoff. A F/A that worked the L-1011 once told me "Shimmy time in the summertime is takeoff time!"
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Mas777 From United Kingdom, joined Jul 1999, 2935 posts, RR: 6
Reply 4, posted (9 years 7 months 3 weeks 9 hours ago) and read 3225 times:
From what I recall - most takeoffs pre-1990s were always quite rattly. Be it 747 Classics, L1011s, DC10s - overhead bins used to pop-open and ceiling fixtures used to shake on take-off. It was not uncommon for bags to fall out of compartments on touchdown - I seem to recall - and it never seemed to matter which airline/aircraft you were on. I put most of it down to poor quality fittings which have all been improved over the years - such that we get beautiful cabins that hardly tremor nowadays.
Take-off vibration was explained to me by a pilot friend of mine - as I often noticed this onboard MAS 744s and thought it was an MAS phenomenon but in fact he flies BA 744s and they get it too - its due to wheel spin from the main undercarriage which often stops once the wheels stop rotating and stow into their compartments... as Markk has explained.
TUNisia From United States of America, joined Aug 2004, 1843 posts, RR: 5
Reply 6, posted (9 years 7 months 3 weeks 8 hours ago) and read 3176 times:
I had the pleasure of flying on one of TWA's last L-1011 flights from STL-BOS back in the day. It was a great flight, and yes all of my L-1011 flights were characterized by that shimmy right at takeoff. Nonetheless, I always felt safe on a L-1011 and it seemed to be one of the best planes at dealing with turbulence.
Also, I've noticed that a lot of the AZ A32X flights that I've been seem to sway side to side just before takeoff... why is this?
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Thrust From United States of America, joined Sep 2003, 2686 posts, RR: 10
Reply 7, posted (9 years 7 months 3 weeks 8 hours ago) and read 3161 times:
THe L-1011 may have shuttered on takeoff...but it was still one of the safest passenger aircraft ever to fly...no other aircraft in the L-1011's time racked up a near perfect safety record. Almost all the L-1011 crashes I have heard about were either due to the weather (the DL L-1011 crash at DFW due to microburst)...pilot error (TWA N11002, written off due to aborted takeoff at JFK)....or fires on the ground (TWA L-1011 N31007, was parked at the time). Only major problem were the Rolls Royce engines at the beginning of service in the early 1970s. The DC-10 may have been bigger than the L-1011, more flexible in range...and may have generated greater sales...BUT as we all know was no match for the L-1011 in terms of safety.
NWA Man From United States of America, joined Jun 1999, 1828 posts, RR: 12
Reply 9, posted (9 years 7 months 3 weeks 7 hours ago) and read 3065 times:
I've been on a couple of NW DC-10s that shuddered while taking off... the last one being a Reef Runway departure from HNL-SEA. Can't say I enjoyed the shaking too much, even though I knew everything was okay... I just wanted to get to sleep, which wasn't made very easy by the vibrations.
Trintocan From United Kingdom, joined Apr 2000, 3224 posts, RR: 4
Reply 10, posted (9 years 7 months 3 weeks 7 hours ago) and read 3043 times:
Yes I have noticed that shudder on BW TriStars on take-off - once an overhead compartment dropped open on take-off! Mercifully the bag contained therein did not fall out and injure anybody. The panels would just shake violently during the take-off run and just until after lift-off.
SOU146 From United Kingdom, joined Jun 2004, 53 posts, RR: 0
Reply 11, posted (9 years 7 months 3 weeks 7 hours ago) and read 3002 times:
I also noticed some shuddering/vibration a few years back when I flew LHR - HKG - AUK on a CX A343 on the initial climb out off the runway (I was sitting just behind the wing, in one of the window seats).
SegmentKing From , joined Dec 1969, posts, RR:
Reply 12, posted (9 years 7 months 3 weeks 6 hours ago) and read 2954 times:
a lot of what people mention has it right on the dot: spinning wheels. You also need to take into account the runway condition. I've been flying the ERJ's from Key West to Orlando lately and I've noticed how "rough" they feel while on the ground, so its just not the classics.
Boeing, from what my friends tell me, started using different types of shocks & bearings for their main landing gear attachment points, which is why you don't feel it as badly on the 737/767/767/777, which I have noticed to seem to "ride the runway" smoother..
Spacecadet From United States of America, joined Sep 2001, 3524 posts, RR: 12
Reply 14, posted (9 years 7 months 3 weeks 6 hours ago) and read 2912 times:
If you were sitting at a certain point behind the wings, you probably felt the ground effect vortices. This is normal and happens in all aircraft, at least those with wing-mounted engines, whether they be new or old, depending on where you're sitting. I felt it in my last two 747 flights but have also felt it in DC-10's, L1011's, 767's, 757's, and other aircraft with wing-mounted engines (I'm honestly not sure if you'd feel it in an airplane with only tail-mounted engines).
You will also feel thermal vortices coming off the ground shortly after liftoff, especially on a hot day. Runways can get very hot and reflect that heat back into the air. Though this will usually feel more like light, regular turbulence...
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