The Red Bull Soapbox Race proves the best motorsports don't need motors. Here's your gravity-powered racing bucket list: 🛷 Red Bull Crashed Ice: High-speed downhill skating through obstacle courses 🚗 Power Racing Series: $500 electric go-karts built from power tools and scrap 🎃 Punkin Chunkin: Medieval catapults launching pumpkins over 4,000 feet