[Coley] sent in this port of jetpack for the propeller uc, but when I started poking around I discovered this sweet hybrid robot platform. A four stroke Robin/Subaru 35cc motor drives a car alternator, providing virtually unlimited (in the robot world) power on demand. Hit the video after the break for a quick R/C demo and an idea of how loud the engine is. Offhand, I recognize the lovejoy coupler that was used to connect the engine to the alternator.
By the way, this bot is featured in the latest Robot magazine, so you can get details there if you hate reading forums.