Redesign the Islander so that it's really clean and pointy. Mag-lev it down the runway and up a ramp, both of which point at the destination. At some point c 3,000' with runway in sight, flick the engine's two big toggle switches to the ON position . . . preferably at the same instant.
As with all forms of transport - not needing the power in the first place is the best route to economy.