Originally Posted by
ThreeThreeMike
Based on current power densities, a 90 Kg battery will provide enough power to support a Twin Otter for three or four minutes.
You are a bit off and misunderstood the point Pattern_is_full was making. The MagniX - Harbour Air retrofit of the Beaver with electric power is pretty much based on the PT6 STC and 6000 lb increased gross weight, which allows for 40 minutes endurance with 6 passengers with a 600 - 700 kg battery and still within the STC weights. Harbour Air typically does 15 minutes hops with their Beavers so the numbers check out ok in my book.