This video is about a twin cylinder model airplane motor that my dad built back in the late 1960's or early 1970's. He used plans from an article that was in the May/June 1966 issue of American Modeler Magazine.

Link to NightFlyyer    / @nightflyyer  

Link to NightFlyyer Twin Cox .049 cylinders equals one .098 Nitro Engine.
   • Twin Cox .049 cylinders equals one .0...  

Here are a few more of the Cox based twin and multi cylinder engines that I found by Googleing cox twin motor. A link will be in the description.
https://www.google.com/search?q=cox+t...

Cox based twin and multi cylinder engine on EBAY https://www.ebay.com/itm/324541412304

URL for Boston Gear https://www.bostongear.com/products/o...
Transcript