odd climb behaviour

[Guest almoto]

I'd like to say i am constantly amazed with the detail of the concorde sim im in the middle of a flight from ksfo to kiad and got my final climb approval from salt lake center mach 1+ is a good way to go:). this is my frist flight after downloading the new fde and i have noticed that i was climbing between 1500 and 2000 fpm at fl 370 and 410 after it went to max climb/cruise it is porpoising between +/- 500 fpm vfe is activated any ideas?thanks bill

[Guest jase439]

I've only experienced this under three occassions:1. I was exceeding Vmo (overspeed) - flying outside the barber pole2. I was flying outside the mach envelope3. My C/G was not far enough aftIn all cases, the porposising was exactly as you described. As long as I took a care to make sure my C/G was sufficiently AFT before I went super sonic and that I was flying just under the barber pole, I found a smooth climb all the way to 50,000 and Mach 2.You might also try a shallower V/S controlled climb - like 1000 fpm.JPS. If porpoising starts, disconnecting the A/P and trimming the pitch manually before re-engaging the A/P can help. Sometimes the A/P can get into viscious feedback loops if you take the aircraft even slightly outside the envelope. I have seem a similar behavior in the roll axis where you can get this almost dutch roll effect that eventually amplifies itself to a point where you are doing a grand slalom through the sky.