TODAYS Performance exam

[spitfire747]

Hello all....

Todays performance exam seemed to go well, with only a few questions foxing my brain.....

- what happens to the speeds Vx and Vy with increasing altitude for a given TAS?

a- both increase
b- both decrease
c-Vy remains constant, Vx either increases or decreases
d- ????????

I went for a as everything I have seen said Vx is constant and Vy decreases, this wasn't here and as TAS decreases when climbing I took a guess and went for this...


and this one



- At what speed is the most induced drag produced for straight and level flight ata given alt and mass

a- Vmo
b- Vs1
c- speed for slowest flight at that altitude
d- ?????

I went for c- and not b as VS1 is the stall speed and hence stalled hence no lift and no induced drag, and at slow flight the angle of attack would need to be highest to provide as much lift as possible hence more induced drag..



Anyone KNOW the correct answers


Cheers, Spitty
:-0