I taped off half the inlet this morning, but I'm thinking that just warming the batts is the biggest thing. Logged my last flight this morning. Voltage never went under 36 volts until after 3 minutes into the flight. Also went up 8 amps. Pack temp was around 100F when I put it into the plane. Been running a 15xl with a 22x12. 2700 watts with the heated batt today. Definitely improves the performance.