Gilles Rosenberger, co-founder of Faraday Aerospace with Michael Friend, former Technology Director for Boeing, commented on a recent entry on H55’s Energic two-seat trainer. He expanded on the idea of total operating costs for electric aircraft, including the battery replacement. He congratulated the H55 team and added a point about which your editor will attempt greater diligence. “But why keeping talking about operating cost and not total cost of ownership? No pilot, no student is going to pay only few dollars per hours based on the energy cost. Who do you believe is going to pay for other cost including the battery amortization?” Practicing the best public relations and salesmanship gambits, most aircraft sales operations don’t mention the eventual cost of battery replacement. Gilles, who can speak from experience because of his work on the Airbus E-Fan project, says, “Best industry standards seem to be today 1.000 € (or $1,125) per kWh for a 1,000 cycles non-certified battery pack.” What …