Va calculation question

[jawright]

If i have to figure out maneuvering speed for a chandelle and my answer comes out to 94 but the poh says 105 for a c172s. what would be the correct one? i think the published 105 in the poh is based on max gross weight, is that correct? when i interpolate Va from max gross weight Va i get 101. so would you use 101 in the Va calculation or just go with 105?

If you got 94 via the formula, I'd go with it for 3 reasons:

1) Your plane is probably below gross weight and
2) It's the more conservative answer
3) Interpolation is less precise than the formula

 

[tgrayson]

After reading this thread, I am not sure I understand Va anymore

That is the true measure of wisdom.

 

[MidlifeFlyer]

That depends on what you mean by "still holds".

Thrust required will scale with weight as per the formula, but the thrust available will not.

Yep. That's what I meant.