Nice video about pitch stability. However, researches have shown that the vertical position of CoG also influences pitch stability. This may leads to critical behaviours such as auto-diving. I'm researching on this but have got little detailed knowledge. Have you investigated about this and would you like to discuss it? Thanks.
I'll be covering tumbles in the next video. Adding more area behind the centre of gravity (the further away the better) will certainly resist tumbling, so in that sense then yes, adding a horizontal stabiliser will act to resist it. Angling that tail down relative to the wing (longitudinal dihedral) also adds pitch stability too. The Combat also has a pretty wide nose angle though, also the planform of the wing (straight tapering) means you don't get the area further back from the wing tips, so that would count against it. So comparing a Combat with tail to other toplesses without tail, it's hard to say which is more tumble resistant. They all pass the same pitch tests, so do all have similar characteristics in terms of pitch stability. Pitch stability and tumble resistance aren't exactly the same thing though (although they are correlated), I'll need another half hour video to go into all this fully though.
