Subsystem 06 of 13
One shared coolant loop keeps the motor and inverter inside their temperature limits over a full endurance run. For WFR26-E the system was overhauled: every component was bench tested for pressure drop and a larger pump was fitted.
Cooling
Component and system pressure-drop curves from bench tests drove pump selection.
The side wing houses the radiator, placed on the right side for higher average endurance airflow.
It was designed around the most restrictive of the motor and inverter temperature limits, then sized for the heat generation of a full endurance run.
The team measured the pressure drop of the radiator, motor and inverter at different flow rates, built a system curve, and chose the pump from it within the available low voltage power.
Endurance runs counterclockwise, with more left turns, which gives the right side more airflow in the most thermally demanding event.
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