E1 measurement limitations
Date: 2026-05-18

This folder records final propeller-loaded same-RPM E1 steady-state electrical evidence. The processed tables report input-side electrical behaviour derived from the STM32 E1 controller logs: VBAT, input current, and input electrical power.

Allowed interpretation:
- The E1 data can support statements about measured/processed input voltage, input current, input power, voltage sag, and repeatability at the selected P0 same-RPM operating points.
- The E1 data can be compared at the recorded R1/R2/R3 target-speed conditions because the DShot commands were selected from the P0 tachometer mapping.
- The repeated run cycles can be used as repeatability evidence for the input electrical telemetry under the same logged setup.

Important limitations:
- Input electrical power is not strict ESC efficiency.
- The E1 logs do not include torque, thrust, shaft power, aerodynamic output, or mechanical output power.
- Same-RPM input electrical comparison does not prove equal thrust, equal torque, or equal useful propulsive output.
- The data were collected on the local propeller-loaded bench setup, not on a calibrated dynamometer.
- Current and voltage values are firmware-processed telemetry values from the ADC/INA199/VBAT-divider measurement chain; final thesis wording should mention calibration and uncertainty limitations unless separate calibration evidence is added.
- DShot command differences between Si and GaN boards are operating-point selection evidence only, not performance evidence by themselves.
- Any conclusion about lower loss, higher efficiency, thermal superiority, flight performance, or commercial reliability requires additional evidence beyond this E1 folder.

Recommended thesis wording:
- Safe: "The E1 experiment reports input electrical behaviour at P0-selected propeller-loaded same-RPM operating points."
- Safe: "The processed input power is treated as an input-side electrical quantity, not as complete ESC efficiency."
- Unsafe: "The GaN route is more efficient" unless supported by torque/thrust/shaft-power or other matched-output evidence.
- Unsafe: "The same-RPM points prove equal mechanical output" because RPM alone does not establish torque or thrust.