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Boeing-Airbus Static Margins  
User currently offlineKeycaukr From , joined Dec 1969, posts, RR:
Posted (13 years 1 month 1 week 2 days 6 hours ago) and read 2413 times:

In the dedision not to use the variable swept-wing design in aircraft like the 777 and the A3XX as well as the proposed SST successor, these companies said that, in addition to other problems such as weight, that the variable swept-wing has large shift in center of pressure with corresponding increase in static margin. And that the increase in the static margin leads to higher trim drag and reduced maneuverability at high sweep angles of the wing.

Can someone tell me more about what static margins are? Thank you in advance.

2 replies: All unread, jump to last
 
User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 1, posted (13 years 1 month 1 week 2 days 4 hours ago) and read 2374 times:

The margin of static stability is simply the difference between neutral static stability and the positive value possessed by that aircraft.

  • Too much stability is detrimental to maneuverability.
  • Not enough stability is detrimental to controllability.

    The Center of Pressure is always behind the Center of Gravity. The further the two are apart, the greater the pitch stability. Thus if the CP moves aft at high angles of attack, the stab and elevator trims have to compensate for changing moments. The CP moving aft have would have the same affect on the taildown force required as if the CG were moved forward -a greater TDF- which induces more drag.

    Further explanation of the effects here would be redundant for most readers, but let me know if you would like to read my definitions et al...

    aaron


  • User currently offlineKeycaukr From , joined Dec 1969, posts, RR:
    Reply 2, posted (13 years 1 month 1 week 2 days 3 hours ago) and read 2366 times:

    I've found descriptions of static margin difficult to find. It's great to get the info you've already presented. Yes, please add to this further explanation and effects... as you see fit.

    Many thanks.


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