Hi CGR,

The model had just been flown. The system was live with the throttle at zero. When trying to reduce the aileron throw on the low rates switch the throttle was inadvertently reversed via the TX, so no throttle now became WFO and the injury occured. I'm sure that had the radio been one he was familiar with the injury would not have occured as he wouldn't have selected the wrong channel.

Restraints or remove the prop as suggested seem to be the safest way to go when working on electric models. The only "good" thing was the motor didn't keep turning as having done the damage it appears to have lost a phase and only vibrates without turning.

Cheers,

Colin