If it's really airtime you want, pull the motor. push the servos all the way up to the front, add a couple ounces of weight and get a Hi Start. I did that with my Sig Riser. My Spirit has an 05 cobalt / 8X4 prop. It weighs about 4 pounds with the battery and everything. My Riser comes in at just over 2 pounds(34 oz). There have been times when I've had the riser up for almost an hour before I had to land it.