Thanks everyone. So far my understanding is this (...hopefully I'm in the right ballpark):
- Forward CG = more TDF required
- Aft CG = less TDF required
- If the aircraft is disturbed and it...
- pitches up, airspeed decreases = TDF decrease = nose goes back down
- pitches down, airspeed increases = TDF increases = nose goes back up
And if I'm not mistaken that describes
static stability. But I'm unsure what factor determines whether the oscillations would then increase, or decrease from this point onwards.
i.e. what could cause
dynamic instability?