Overall efficiency and flight time of tiny whoop quad-copters is discussed. Measurements and calculations are performed to get estimation of the motor and propeller efficiencies
Измерения и вычисления эффективности моторов, пропеллеров, тяги и времени полета для tiny whoop.
Attempt to 3d print custom tiny whoop frame with weight less than 3g. The trick is to make the frame thin and flexible (elastic).
RFM22B vs RFM98W. FSK vs LoRa. Tests show no difference. Is RFM98W a fake?
How range of RF communication can be extended with modulation techniques
RC finder (beacon). Range test of digital and analog modes
Examples of back-of-the-envelope calculations for heli, quadcopters, hoverbikes: electric, gasoline and man-powered
Math shows that maximal hovering time can be easily estimated regardless of type of the copter, battery or fuel.
this is a copy from my msh-tools.com (not exists anymore) and describes how to convert fitness tracker to ultimate security device