djpacro Posted May 20, 2015 Author Share Posted May 20, 2015 But FAR 23 is clear that at VA, an airplane must be designed strong enough such that the elevator control may be moved suddenly to the forward limit - exactly the same requirement as for back stick or yoke. Link to comment Share on other sites More sharing options...
Nobody Posted May 20, 2015 Share Posted May 20, 2015 Agree. The Va for negative is actually your Vs x sq rt of -ve LF. The positive Va is, by example, ( if Vs = 50, so Va = 50 x 1.95 = 98). So in most +3.8 x -1.9 LF aircraft the Va would be considerably lower for negative LF, eg 50 x 1.40 = 70. How does this translate to an aerobatic aircraft - probably is understandable because of their higher LF's? Then add in the rolling forces..... doesn't bear thinking about! happy days, All correct except that often the inverted stall speed is a bit higher giving a a higher Va Link to comment Share on other sites More sharing options...
djpacro Posted June 3, 2015 Author Share Posted June 3, 2015 It doesn't because generally the negative limit load factor is much less than the positive one. Link to comment Share on other sites More sharing options...
djpacro Posted June 3, 2015 Author Share Posted June 3, 2015 For those who like podcasts: http://www.boldmethod.com/direct-to/season-1/designed-maneuvering-speed/ Link to comment Share on other sites More sharing options...
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