The current schedule for Greensboro, Scholl said, envisions construction in 2023, production launch in 2024, rollout of the first Overture in 2026, flight tests in 2027, and Federal Aviation Administration certification in 2029.Īmbitious, sure, but the Wright Brothers were also ambitious. “If Boom cannot use the facility, it can be converted to a different use,” he said. Baker said he is engaged with 13 companies who would like to locate on property adjoining the airport: about half of them would like to provide aircraft maintenance. But Kevin Baker, airport executive director, said that the facility will be constructed with four garage door-type entrances on the side, so that it could easily be converted to maintenance bays. No engine maker was announced, but the 787 is typically powered by either GE Aerospace’s GEnx or Rolls-Royce Trent 1000.Īsked his thoughts on the simultaneous events, Scholl said, “Supersonic flight is complimentary to subsonic flight.” He said Boom’s “ultimate goal is to enable supersonic flight for everyone who flies, we’re starting with the focus on the premium passenger being able to operate at fares 75% lower than (the norm) - Overture is just the start.”Īt Piedmont Triad, North Carolina will pay $57 million to build a facility to house an assembly line, where supplies enter and finished products emerge. As Scholl spoke in Greensboro, top executives of Boeing BA and United Air Lines were in North Charleston, South Carolina to announce a large United order for Boeing 787s. Tuesday was a big day for aviation in the Carolinas. “We see the narrowbody market as a real opportunity.” “We are 100% focused on existing programs,” he said. He brushed off the question, saying the company is busy making engines for narrowbody subsonic aircraft, including the Airbus A321. In December, I asked the president of Pratt & Whitney’s commercial engine division whether P&W would work with Boom. To review, Boom faced an engine challenge in November, when Rolls-Royce said it would end their partnership, announced in 2020, “to work together to identify a propulsion system that would complement Overture’s airframe.” On Tuesday, Scholl said he was grateful for the effort, noting “We first thought we could adapt a subsonic engine for a supersonic flight.” But the thinking changed.Īlso in November, trade publication Flight Global reported that potential suppliers GE Aviation, Honeywell and Safran Aircraft Engines also showed no interest in developing engines for Overture. This way it’s more capital efficient, working directly with the supply chain.” For them, “Takeoff is the easy part,” he said.Īs usual, Scholl declined to comment on financing, except to say, “We’ve always assumed that Boom would be financing a significant portion of engine development. “All the money is for maintenance and parts.” Additionally, he said, subsonic engines work hardest at takeoff, while supersonic engines operate at full performance for hours. In fact, typically, “the engines are given away,” he said. Again the pressure drop, can be achieved through an expanding volume - hence the divergent shape.With subsonic engines, maintenance is costly and disruptive to operations, he said. The "ordered" molecules develop a shockwave front, on the expense of the random kinetic energy - which is associated with the pressure (thus leading to pressure drop). More specifically you need to transform the random Kinetic energy of the molecules and make it more directed (in a similar way that an electric field in a conductor makes the electrons move towards one direction). Essentially, in supersonic flows to increase the velocity there is a need to increase the quality of kinetic energy of the molecules. So the nozzle area diverges to increase the available volume (and result in density decrease)Īlso while I was trying to remember I found another interesting interpretation of the pressure drop based on molecular dynamics. Therefore the pressure will drop, if the volume increases. However, because the last part of the equation of perfect gases is constant (at a constant temperature): One way that occur (at a set temperature) is through the change in density - which is related to the volume. This resuls in density variations (which are associated to the supersonic wave).įurther acceleration (to higher mach numbers) require greater drop pressure. However, in the case of supersonic (or close to supersonic) the air can be considered compressible. In a subsonic flow air can be considered as incompressible. One explanation I seem to remember (in another lifetime) was that the supersonic nozzle offers higher pressure drop through dropping the density.įigure: subsonic nozzle and diffuser source: wikipedia
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