Page 28 - Dec 2022

The circuit breakers for the manual system, shown above.
since now a normal system will be using 30 or 40 amps – 3-blade or 4-blade – this is readily observed on the generator loadmeters, each of which would increase about 6 or 8%.
The electric wires – typical, round wires – embedded in the inner and outer sections of the earlier boots, as we’ve stated, pull about 5 amps each. When BF Goodrich developed their “Hot Prop” system – with only a single heating element per blade – it would be logical to think that now 10 amps would be required. But no, it’s still 5 amps. This “magic” is accomplished by replacing the wires with metal foil that starts wider near the spinner but narrows as it moves out the blade. This causes more heat to be felt closer to the spinner and less further out. As we’ve stated, no heat at all is needed beyond the boot due to flexing and centripetal force and it follows that the farther out we go on the blade the less need
26 • KING AIR MAGAZINE
DECEMBER 2022