Vary Speed - Xoar Coaxial 47 and 40 inch prop

Posted by Baiyun Tang on 2019-03-12 19:44:57
Series 1780 RCbenchmark staff

Side A test components:


Side B test components:
Description:

Coaxial testing specification: Coaxial back-to-back distance between propeller tips: 323mm (12-3/4") Axes offset: 0mm Two propeller contra-rotating, and generate total thrust in a single direction.

Testing environment: Tested in static air (indoor). Power source: 12S LiPo Propeller adapter: None Propeller spinning: Leading edge first. RPM Sensor: Optical. ESC configuration: Stock (default config)

Video:

Photos:


Data
Side A:
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Side B:
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Combined side A and side B:
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Derived data
      Electrical power = Voltage × Current
      Mechanical power = Torque × Rotation speed
      Motor efficiency = Mechanical power / Electrical power
      Propeller efficiency = Thrust / Mechanical power
      Overall efficiency = Thrust / Electrical power

Coaxial combined data
      Combined thrust = Thrust A + Thrust B
      Combined electrical power = Electrical power A + Electrical power B
      Combined mechanical power = Mechanical power A + Mechanical power B
      Combined motors efficiency = Combined mechanical power / Combined electrical power
      Combined propellers efficiency = Combined thrust / Combined mechanical power
      Combined overall efficiency = Combined thrust / Combined electrical power

Plots
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Test script

System info
RCbenchmark app version: dev-1552310313406-1.1.6-RC
Firmware version: 2.8
Rotation speed sensor: optical probe, with 1 reflective tape

Test script
Script: Series 1780 coaxial steps v1  
Log:

ESC A/B init values (µs): [1000, 1000]


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