Most interesting plane i built & flew was a Blackburn 1912 monoplane with a 1.5cc diesel engine spinning a 9" prop! Everything about it was so slow and lathargic but it was 100% flying all the time!
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That actually sounds pretty interesting! I can't even imagine flying a gas or diesel engine plane... I would end up killing somebody

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I also race RC cars, but only with my coworkers. Everytime they upgrade theirs, I have to upgrade mine to be faster. I currently have a 3.3 T-maxx that is loaded with about $1,000 in upgrades. I LOVE that thing!!! I also have a Team Associated rc18t which is about the best little rc car I have ever had. I have about $500 in upgrades on it (Mamba 6500 kit, aluminum parts...) To me, RC cars (and planes) is an extremely addicting hobby!