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Adverse Roll On Asymmetrical Seating  
User currently offlinePilotboi From United States of America, joined Sep 2007, 2366 posts, RR: 9
Posted (6 years 10 months 2 weeks 6 days ago) and read 2344 times:

I often wonder - does using an asymmetrical seating layout cause an adverse roll? For example on the DC9/MD80/B717 series, with 2+3 or 3+2, having a whole "column" of people on one side of the CG. It's not a large arm, but it's a lot of weight. And if it makes a difference - is there anything in place to compensate? For example, built in aileron trim or something similar.

3 replies: All unread, jump to last
 
User currently offlineWILCO737 From Greenland, joined Jun 2004, 9097 posts, RR: 76
Reply 1, posted (6 years 10 months 2 weeks 6 days ago) and read 2325 times:
AIRLINERS.NET CREW
HEAD MODERATOR

You dont feel much of that! As you said the arm is too short to be very significant...
Yes, you have aileron trim...

Even on a Cargo airplane (with way more load than on passenger flights) you can have a huge amount of difference between the left and the right part and you still dont really feel it during flying...

WILCO737 (MD11F)
 airplane 



It it's not Boeing, I am not going.
User currently offlinePilotboi From United States of America, joined Sep 2007, 2366 posts, RR: 9
Reply 2, posted (6 years 10 months 2 weeks 5 days 13 hours ago) and read 2231 times:

After rereading my question, I realize it was silly to ask if they had aileron trim. Of course, I knew that. I guess what I was implying, was actual built in differences in the ailerons per side. But I guess with it being so small, even if there is a moment, it can be countered with some trim.

User currently offlineStarlionblue From Greenland, joined Feb 2004, 17109 posts, RR: 66
Reply 3, posted (6 years 10 months 2 weeks 5 days 13 hours ago) and read 2220 times:



Quoting Pilotboi (Reply 2):
Of course, I knew that. I guess what I was implying, was actual built in differences in the ailerons per side. But I guess with it being so small, even if there is a moment, it can be countered with some trim.

The asymmetry is so small it's insignificant in practice. Even 30 pax and some bags slightly to one side won't have an impact given the weight of freight, checked bags, fuel, engines, wings and fuselage.



"There are no stupid questions, but there are a lot of inquisitive idiots."
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