VSI at end of an approach
Does anyone have any idea as why a standard (read massive delay) VSI will show an increase in descent rate right as you are coming to a hover at the end of an approach. I noticed this when I saw my students doing steep approaches and was waiting to bust them for busting the 300fpm (im a bastard what can I say). Anyway even when they held a perfect descent all the way in and actually as they were applying power to slow the descent rate, the VSI would show an increase of about 100fpm. I know its not something deadly important to flying just wondering the reason.
My only guess is maybe ground effect...?
Thanks,
Cooper