Crowhurst planned to sail in a trimaran. These boats were starting to gain a reputation, still very much unproven, for speed, along with a darker reputation for unseaworthiness; they were known to be very stable under normal conditions, but extremely difficult to right if knocked over, for example by a rogue wave. Crowhurst planned to tackle the deficiencies of the trimaran with a revolutionary self-righting system, based on an automatically inflated air bag at the masthead. He would prove the system on his voyage, then go into business manufacturing it, thus making trimarans into safe boats for cruisers.