High altitude flight test: ground3400m,flight altitude 7000m.

ground3400m,flight altitude 7000m.

2015-05-19%2015-10-05.tlog

2015-05-19%2014-38-08.tlog

barometric altitude 7000m gps altitude 6847m .error 53m

airspeed 17m/s error 7-8m

Landing field altitude 3400 m.Spiral climb, guidance mode.Target height increasing to relative 3600 m on the ground, eventually reached cruising at an altitude of 7000 m height.
Barometric altimeter shows the height and the GPS height error of about 60 m, airspeed is low and the GPS speed.Actually not a lot of wind.Estimation is high altitude air density is low, should be a certain amount of compensation.Finally landed safely.Take about 45 

The next day, at an altitude of 2800 m, spiral climb to 4600 m fly folding line after 1 hour.View the data:
7-8 m airspeed error.Error 80-90 - m.