fly up to 140 mph with no fuel or engine. This piston based flapper is the peak of my infinite hopper series, cause it flies. to fly first adjust trim for max lift, then move vtol forward just less than half way mark. This thing will hop when you apply throttle, so roll or yaw til you see a straight away. ground hopping is about 25 percent throttle or more. max throttle to 60 to 70 mph then pitch to lift off. when you reach about 90 mph to 100, you can keep trim at max lift to not lose altitude. the gyro will do auto level flight, just kickback and enjoy the ride. You can also position ball foot back with vtol. center ball foot straight down to land. just throttle down to glide and land. enjoy