Vern Raburn has promoted program transparency as a responsible way for a start-up company to do business. Lately, his transparency has been on the wane.
As an example, he makes the statement that all range figures are based on maximum speed. Does that mean the throttles are jammed all the way forward and the airplane is going as fast as it can or is the airspeed pegged at the redline? And at what altitude is the mission flown? Are step climbs involved?
His website used to diagram the flight profiles showing a direct climb to 41,000 ft and cruising at 375 knots. Now Raburn is just throwing the numbers out and letting the audience draw whatever conclusions they may.
As pointed out by a reader of this blog, Vern was interviewed in early July by Aviation International News, Vern mentioned further performance shortfalls for the first 100 deliveries, range will be 1,050 nm rather than the 1,150 nm as published and planned for the later aircraft. Nowhere on his website will you find this information.