All Candela vessels use fully submerged hydrofoils in a specific configuration. We employ one large, straight main foil close to the center of gravity and a smaller foil in the aft, attached to the propulsion unit. All Candela foil systems are retractable for trailing, storage and shallow water operation. As for the wing profile, in the pursuit of the perfect relation between efficiency and performance, we have designed our own proprietary shape for our foils. To offset the environmental footprint of the carbon fiber and batteries in our vessels, we have built them to last a long time. Moreover, we build light, meaning we need less carbon fiber and smaller batteries and end up using a lot less energy to transport passengers than our competitors.here are no alternative materials that meet our expectations of stiffness, weight, longevity and cost.