FLY is FUN

Hello Petr!

It's a fascinating APP you have developed and the possibilities are endless!
My first impression is: the digital pressure sensor of the phone (in my case a second-hand Samsung S3 in good condition) is remarcably accurate, and I suspect it is comparable to traditional IFR-certified altimeters, which is as far as I remember +/- 60 feet accuracy.
Of course, what you get is cabin pressure, but this is good enough for most of us.

My suggestion for a possible improvement to one of the next editions of Flyisfun is this: To join the 2 pressure-calibration procedures in one single page, namely in the Flying Settings/QNH page, by moving App Settings/Preferences/Sensor Settings/Pressure Sensor Calibrating-function to the Flying Settings/QNH, thereby saving around 6 tappings in all the submenus.

kind regards
findan

Do you need to calibrate pressure sensor often? I do it only ones at one device.

OK Petr, I can see you have a point.
After all, for real IFR flying the authorities accept instrument errors of +/-2 hPa, and with the correct QNH set I havn't seen indicated altitude errors (or indicated AGL errors on the ground) of that magnitude yet, +/- 20 feet at most.
I just like to set AGL to "zero" before take off, but realize this is really superfluous, especially under VFR conditions.....

I am thinking about calibration long time.
There is a problem, becaus there is not accurate static pressure in the cockpit. When your airspeed is zero, it is accurate, but when you are flying there can be difference between real static pressure and "cockpit pressure".

So I am thinking about this: Each aircraft (at the aircraft list) could be calibrated to several speeds...