I started off with in 1953 with one of the early model O.K. Cub .049's and used it on a Scientific Little Ace, a Baby Barnstormer, an original Looper (vaguely inspired by the Firebaby which I could not afford at the time) to various offshoots of the basic Baby Barnstormer design.  I also used that engine on two free flight planes, the 555, built off of Flying Models magazine plans and an original I designed myself.   I never owned the other models  of Cub engines...... .074, .099, .14, .19, .29 or the .35,  but some of my flying friends did and I got to see them in action.  Great fun, those Cubs, very user friendly, if not very powerful.  My origina Cub .049 was stolen out of my garage about 1968, but I have aquired another of the same vintage from good old Ebay.............I want to build another Looper..........some day.