Airmodel calculator

Dec 7, 2016

V.0.40 (12.04.2016)
- Sound tachometer improvements for better detection of main frequency (still need testing! Please report if it shows BS);
- Lowest frequency is now 20Hz instead of 50;
- In flight time calc. smaller step for the voltage value;

V.0.31
- Sound tachometer. Measures motor's RPM by analyzing sound;
- Timer;
- Help pages for wing and motor calculators;
- Misc. adjustments and minor bug fixes;