MIL-R-11
TRW Electronics Components MIL-R-11 Carbon Resistor 560Ω (Pack of 2)
You will find that Texonic handles continuous operation without overheating or stalling out.
TRW Electronics Components MIL-R-11 Carbon Resistor 470 Ω (Pack of 4)
What stands out about the build is the exact 1/4 in specification.