Always provide an opening in the cowl to allow air to flow into the fuselage. It is equally important to provide an air exit hole Larger than the inlet to let hot air out. I 2 R and as R increases due to temperature, so does the Lost power. The controller should be mounted uncovered in free air. It is not necessary or advised to wrap the controller in foam or a plastic bag.
Velcro tape attached to the thin aluminum cover is recommended for fastening to the fuselage.
In no case should the thick aluminum cover be used for mounting, this is the FET heat sink and must be mounted free and clear in the cooling air. The controller MUST NOT be mounted by clamping it across the thickness dimension using screws, TY-wraps or other clamping means. Please do not mount the controller such that a constant pull force is exerted on the lead wires. Although they are sturdily attached, they are not meant to deal with a constant force. LED goes out when the throttle is advanced.