Herkimer OK CO₂ Model Airplane Motor

While perusing a box filled with miscellaneous old items at a local garage sale, I spotted this Herkimer OK CO₂ motor buried under door hinges, bags of nails, and light bulbs. It was pretty dirty, but it seemed fine otherwise. Half the propeller was missing, so I assume when it broke, that was on the motor's last flight. The motor had been mounted to the still-attached plywood firewall with three small brads! Price" $1.

After carefully disassembling the OK CO₂ motor, it was soaked overnight in Evapo-Rust, an excellent water-soluble, non-toxic rust remover which I have used often. It cleaned up very nicely. A few drops of Cox after-run motor oil was used when reassembling the motor. I do not have a CO₂ cylinder small enough to fit into the holder, so I have not been able to run it yet.

According to advertisements, the displacement of the Herkimer OK CO₂ motor is 0.0178 in³., which rounds up to 0.02 in³.

For more things CO₂, see the "Fizz-Wizz" article from the March 1962 American Modeler and the "Push-Air CO2-Powered Free-Flight" article from the February 1970 American Aircraft Modeler. You might also be interested in my DP-03 CO₂ motor, with a video of it running.

Posted August 24, 2019