For those of you who have been in the hobby for a while the name "Cox" will be no stranger. Many of us started into the hobby with a Cox plastic control line model and many RCers have used the venerable Cox .049 in various forms to power small aircraft, gliders and even helicopters.
Cox engines use a hardened, formed-steel piston which runs in a softer steel cylinder, this does mean however that they require a reasonable break-in time before they get really consistent but this does pay of in the long run with a engine that will go on for years and years. These engines have the typical Cox extruded crankcase, rear mylar reed valve, counter weighted crankshaft with pressed on aluminum drive washer. The backplate is made of plastic and incorporates the needle valve and the intake pipe from the small carb which controls the airflow to the engine, it also acts as the radial mount for mounting the engine. The conrod is Cox's traditional captured ball and socket link to the steel piston and the one piece machined steel cylinder has bypass ports and slots for the exhaust.Due to this engine having a reed valve fitted between the plastic backplate and the crankcase this will allow the engine to run either clockwise or counter-clockwise, this is determined in which direction you flick it to start, so its great for normal tractor and pusher designs.
Enjoy the fun and excitement of running a small glow engine for a relatively low price and for those of us who remember them from years ago, re-live a little bit of your childhood.
NB: Cox glow engines have a glowhead that requires a 1.2-1.5v power source, do not use anything with a higher voltage or it will blow the element, also best to use fuel with a nitro content of 20% or more.
• Small and lightweight
• Very powerful for its size
• Easy to start
• Can run clockwise or counter-clockwise
Capacity: .049 cu ins
Dimensions: H52 x L55 (not inc spinner) x W27mm
Max RPM: 18,000 (Using a 5x3 with 25% nitro fuel)
Min RPM: 6,500
Recommended Prop sizes: 5x3 to 6x4