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.

Articles About Engines and Motors for Model Airplanes, Boats, and Cars:

• AT's Post-War Motor Roundup - September 1949 Air Trails
• Motor of the Month: K&B Torpedo .049 Engine - November 1952 Air Trails
• Mills "Brothers" - ½   Diesel Engines from England - January 1952 Air Trails
• World's Smallest Mass-Produced Glow Plug Engine Unveiled by Cox - May 1961 American Modeler
• Cameron .09 Marine Engine - July 1954 Air Trails
• Electromotive Power Plants - March 1974 American Aircraft Modeler
• Netzeband Reports on the Aero 35 Horizontal Piston Engine - October 1963 American Modeler
• Wankel Engine Models - July-August 1963 American Modeler
• Multi-Cylinder Engines - March 1967 American Modeler
• Air Progress: The Jet Engine - July 1951 Air Trails
• 50-HT Hopped-Up Jetex - March-April 1963 American Modeler
• Allyn .049 Sky Fury Engine Review - May 1954 Model Airplane News
• CO2 Power is Coming Back - April 1969 American Aircraft Modeler
• Cordless Electric Flight Motors - July 1973 American Aircraft Modeler
• Cox Babe Bee .049 Engine - Operation & Troubleshooting Guide
• Babe Bee: New Member of the Cox Family - April 1957 American Modeler
• Cox Golden Bee .049 Engine - Photo of disassembled engine
• Cox Thimble Drone PeeWee .020 Engine - Engine photo & operation sheet
• Junior 451 / DP-03 CO2 Model Airplane Motor - Photos, user's guide, and video of it running
• Designing a Ducted Fan - February 1971 American Aircraft Modeler
• Ducted Fans!  --  Scale-Like R/C Planes - March 1962 American Modeler
• Dyna-Jet Engine - June 1957 American Modeler
• Engine Idling Secrets (Part 1) | (Part 2)

      November & December 1962 American Modeler

• Engine Roundup - 1955 Air Trails Annual Edition
• Eureka Importing Company "Tiger Jet" Ad - July 1957 American Modeler
• Fox 15 C/L Engine - Photo of my 1st engine bigger than a Cox .049
• Fox 35 C/L Stunt Engine - Photo of my next C/L engine,
• Fox 40 R/C Advertisement - April 1962 American Modeler
• Gentlemen, Start Your Engines! - August 1969 American Aircraft Modeler
• Global Engine Review - 1963 Annual Edition American Modeler
• Hot Engines! - January/February 1963 American Modeler Article
• How Bill Wisniewski Reworks His Engines - June 1957 American Modeler
• How to Select the Proper Glow Plug ... and Why - 1963 Annual Edition American Modeler
• Inside the Two-Cycle Engine - February 1968 American Aircraft Modeler
• Iron Curtain Engines - Da? Nyet? - August 1962 American Modeler
• Jetex Jet Engine Ad - May 1954 Model Airplane News
• Jetex Motors & Fuel Pellets - Photos of my collection of motors
• Johnson Engines Continue on Improvement Program - February 1957 American Modeler
• Powerplant Revue: Hi's Radio Mill Proves Potent Yet Docile .35 - February 1962 American Modeler
• McCoy .35 Red Head C/L Engine - Photos of my engine and the user's sheet
• Model Motor Museums (Part 1) | (Part 2)

      November & December 1959 American Modeler

• Netzeband Reports on a Horizontal Piston Engine

       September/October 1963 American Modeler

• Norvell .15BB Revlite C/L Engine - Photos of my engine
• O.S. 25 LA Engine - Photos of my engine
• Outboard Model Boat Motors - Advertisements of many different outboards
• Rubber Motor Testing - August 1968 American Aircraft Modeler
• There's a Wankel in Your Future - June 1968 American Aircraft Modeler
• Thimble-Drome Piper Super Cub 105 - October 1957 American Modeler
• The Visible Wasp Airplane and V-8 Automobile Engines - Advertisements
• The Wright Cyclone 9 Radial Aircraft Engine - by Monogram

Posted August 24, 2019