Type A blades: use flaps (ailerons) as braking devices outside the leading edge;
Type B blades: use advanced braking devices, and Lightning strike points mainly occur within a few kilometers of the tip. Within ten centimeters or on the edge of the tipping bucket support bearing;
C-type blade: This is a relatively new blade with an advanced braking structure composed of wire of cad steel. The lightning impact point of the C-type blade is also basically the same. It occurs a few tens of centimeters from the tip or on the edge of the tilting bucket support bearing;
Type D blades: all insulating. materials.
I don't feel good about your problem...