Hello,I was wondering to myself this question:Why, in every single payware tube liner I own (NGX, PMDG 744X, and CS757) will VNAV jump from, say, 1200 fpm to 5600 fpm in the blink of an eye, then stay there for about 25 seconds, and then settle back to ~1000 fpm?is it the speed/alt constritions? Or something else? Just kinda wanted to know . Thanks,

Hello,I was wondering to myself this question:Why, in every single payware tube liner I own (NGX, PMDG 744X, and CS757) will VNAV jump from, say, 1200 fpm to 5600 fpm in the blink of an eye, then stay there for about 25 seconds, and then settle back to ~1000 fpm?is it the speed/alt constritions? Or something else? Just kinda wanted to know . Thanks,

If it happens suddenly, then it is the FSX winds which change direction suddenly and affect the lift of the aircraft (kind of like windshear). I think the registered version of FSUIPC has an option to alleviate this.