Maneuver Speed

[djpacro]

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.

 

 

[Nobody]

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

 

 

[djpacro]

It doesn't because generally the negative limit load factor is much less than the positive one.

 

 

[djpacro]

For those who like podcasts: http://www.boldmethod.com/direct-to/season-1/designed-maneuvering-speed/