RE: What was your first engine?
First R/C engine was a Fox .25 RC. You haven't lived until you've hand started a older vintage, fresh from the box Fox out on the ice...in a northern Michigan winter. I did, and I wouldn't trade those experiences (and memories) for all the tea in China.
There's been plenty of other Foxes in the hangar since then. YES....I'm a Fox fan.
Just for fun...I bought NIB samples of my "first engines" just so I don't lose track of where I came from.
God Bless R/C!!