vortex generators on light aircraft
The fitment of VGs to a light aircraft will lower the 1G stall speed. How much? Given the range of speeds available, I would be surprised if the decrease was much more than approx 5 Kts IAS, but I stand to be corrected. However, if you approach to land at the lower speed the VGs permit, you often will find that a steeper approach is being flown then would be flown by the same model aircraft without VGs fitted. No real problem unless you carry out a missed approach at low altitude. As the power/weight ratio has not changed, and you will be closer to the 'backside' of the drag curve, it can be easy to get into an increasing drag situation with insufficient excess power to fly away and with insufficient altitude to trade for IAS. I personally don't like to see VGs on light aircraft that were not designed for them and I don't allow for any significant performance increase over the 'classic' aircraft if I do fly an aircraft that has been the subject of a STC for VGs. But that is a personal opinion. Be careful, though.