When the U.S. military is looking for a custom bike, they look to DARPA. This time, they needed a stealthy dirt bike that could handle rough terrain… and maybe a few other tasks SEALs and Green Berets might need during an operation.
Two potential models were the frontrunners for DARPA’s project. The Silent Hawk, designed by Logos Technology, and the Nightmare, built by LSA Autonomy. They are both hybrids, capable of running on lithium-ion batteries or a variety of fuels, including JP-8, propane, or even olive oil.
Both are about as loud as a garbage disposal while running on fuel and about as loud as an indoor conversation when running on batteries.