YES! We used to have sooooo much fun with those little engines and would wonder how something so small could generate so much power. We would take those engines and duct tape them to crudely made Styrofoam 'cars' with four little wheels then set them in the street and watch them go.. Where? No one knows! LOL The fuel would eventually eat through the Styrofoam but we sure had fun.
I had the red, white and blue P-51 that you hold on two strings and go around in circles.
Check this out! http://www.ebay.com/sch/i.html?_sacat=0&_sop=10&_nkw=cox+engine+049&_frs=1