Vladimir

I find this device to be very useful.

I use it quite a bit for evaluating geometry of pattern flights, prop performance comparisons, and G-force loads on the airframe. For most evaluations I record 10 samples / second of 6 or 7 parameters which allows about 10 minutes of logging time. For detailed studies, say for snap roll loads, I may set the sample rate to 40 / sec.

Calibration checks should be devised if you're interested in absolute data, for comparison purposes the unit appears stable. As the altitude and airspeed sensors are pressure based, care must be exercised to prevent pressure variants where the unit is mounted. (Discussed in the instructions).

The best way to evaluate the data is by transferring the file to a spreadsheet (Excel) which will permit expanded graphic display of the data.

Your English is a whole lot better than my Russian!