Starlionblue From Greenland, joined Feb 2004, 13598 posts, RR: 68 Posted (5 years 3 months 2 weeks 3 hours ago) and read 2138 times:
Since the 777 and 330/340 ailerons droop with the flaps (I assume there are other types with this characteristic), doesn't this make them flaperons instead of ailerons?
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MD11Engineer From Germany, joined Oct 2003, 10407 posts, RR: 67 Reply 3, posted (5 years 3 months 2 weeks 2 hours ago) and read 2062 times:
Douglas does it too, on the MD-11, but you can only move them down (controlled by the FCCs)only if there is weight on the wheels and spoilers are down. e.g. the plane is in take off configuration for a little extra lift.
It was to assist with the STOL performance just like it is on heavy jetliners. Only on jetliners STOL means you can land on a ten thousand foot runway instead of needing twenty thousand.
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Starlionblue From Greenland, joined Feb 2004, 13598 posts, RR: 68 Reply 7, posted (5 years 3 months 1 week 6 days 5 hours ago) and read 1741 times:
Ah, no flaps on Concorde. I guess it depended entirely on angle of attach and thus had elevons.
In fact, now that I check (bad me for not doing this earlier) this drawing http://www.concordesst.com/inside/8.html has lables for "elevon" (88) on the outboard surfaces while the inboard surface is labeled "elevator" (77).
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Areopagus From United States, joined Sep 2001, 1286 posts, RR: 1 Reply 8, posted (5 years 3 months 1 week 5 days 23 hours ago) and read 1665 times:
on the MD-11, but you can only move them down (controlled by the FCCs)only if there is weight on the wheels and spoilers are down. e.g. the plane is in take off configuration for a little extra lift.
As soon as the gear leaves the ground you lose some lift? What kind of sense does that make?
S.p.a.s. From Liechtenstein, joined Mar 2001, 904 posts, RR: 4 Reply 10, posted (5 years 3 months 1 week 18 hours ago) and read 1380 times:
From what I understand, the deflected ailerons (name givem by McDD to them) only work for take-offs not landings.
IIRC from my MD11 flight dispatch days, this system increased max take-off weight in 3 tons. Or putting it on a reversed order, I had to deduct 3 tons from the mtow given by my runway analysis charts, if it was inop.
Mr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 29 Reply 13, posted (5 years 3 months 4 days 10 hours ago) and read 1134 times:
It happens to other Airbuses and Boeings as well. I think basically the control surfaces are powered by hydraulics and once they're turned off there's no force in positioning the control surfaces. And the A320s (as well as the B777s) have some pretty light rudders so it just deflects with the wind.
Klaus From Germany, joined Jul 2001, 17768 posts, RR: 62 Reply 14, posted (5 years 3 months 4 days 8 hours ago) and read 1116 times:
It has been mentioned in a parallel thread that large jets usually don´t have gust locks for their rudders, but they have dampers to prevent damage when hitting the stops.
Bahadir From United States, joined Oct 2001, 1298 posts, RR: 13 Reply 15, posted (5 years 3 months 4 days 4 hours ago) and read 1075 times:
As soon as the gear leaves the ground you lose some lift? What kind of sense does that make?
It does make perfect sense. The airplane loses some lift as it gets away from the ground due to the reduction in ground effect. You don't notice that because increased speeds and the thrust makes up for it..
310_engineer From Belgium, joined Dec 2000, 165 posts, RR: 0 Reply 16, posted (5 years 3 months 4 days 2 hours ago) and read 1055 times:
All Airbus FBW planes have aileron droop - that means all except A300/310
FYI: A310/A300-600 do have a 10° aileron droop.They droop when the Slat/Flap lever move out of the 0° detent. This is from the moment you select slats. Actually the droop command comes from the Kreuger selector valve.
Another info: the A310 was the first commercial aircraft to have FBW systems installed.