i spent four days flying it around his little airstrip , and the swiss countryside ; it would lift off in 45 meters ( 150 feet ) , fly safely at 50 km/h ( 32 mph ) , with a top speed of 175 km/h ( 109 mph ) , and land within 18 meters ( 60 feet ) although that was purely academic , i soon got used to , in any sort of head-wind , taking off and landing almost vertically , and a couple of time my tutor swore that i landed backwards .