Tag: overture

Boom Supersonic’s XB-1 test plane breaks the sound barrier

9:09 am

UPDATE: The XB-1, using the exact same air corridor used by Chuck Yeager when he became the first pilot to break the sound barrier in 1947, has successfully become the first privately funded and constructed airplane to fly faster than the speed of sound, doing it three times for about six minutes total.

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The airplane startup Boom Supersonic is hoping to complete its first manned supersonic flight today, piloted by chief test tilot Tristan “Geppetto” Brandenburg.

The flight will be manned, using its prototype XB-1 test plane.

Since March 2024, Boom has carried out 11 test flights as it gradually pushed the envelope toward breaking the sound barrier. [Today’s] flight of the 68-ft-long (21-m) XB-1 prototype will be conducted in a special air corridor reserved for supersonic aircraft. During the 38-minute flight at an altitude of 34.000 ft (10,000 m), the aircraft is expected to reach Mach 1.1, which is half of the ultimate goal of Mach 2.2.

Once the company completes test flights of XB-1 it will begin building its Overture commercial supersonic plane for sale to airline companies, capable of carrying up to 80 passengers. It already has contracts and financial support from a number of major airlines, including United and Japan Airlines.

I have embedded the live stream below. It has already started.
» Read more

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Boom about to go supersonic

9:29 am

The commercial supersonic airplane company Boom is on the verge of flying its XB-1 test vehicle faster than the speed of sound.

The company has been doing a regular test flight program, each time increasing the plane’s speed.

During the latest 44-minute flight at an altitude of 29,481 ft (8,986 m) with Chief Test Pilot Tristan “Geppetto” Brandenburg at the controls, the prototype aircraft reached transonic speed. That is, flight so close to Mach 1 that some areas of airflow over the airframe exceed the speed of sound.

It’s also the point where the XB-1 was subjected to a maximum dynamic pressure of 383 Knots Equivalent Air Speed (KEAS), which is a pressure on the fuselage and wings greater than what it would experience when flying supersonic at Mach 1.1.

In short, XB-1 pushed what was once called the Sound Barrier.

Next step: break the sound barrier.

At the completion of this testing the company will then begin manufacture of its full scale supersonic passenger plane, dubbed Overture, that will carry up to 80 passengers and will sell to airlines. It already has contracts and financial support from a number of major airlines, including United and Japan Airlines.

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On-going manned test flights of Boom’s prototype supersonic plane inching towards the supersonic

9:28 am

During the on-going manned test flights of Boom’s one-third scale prototype supersonic plane, dubbed XB-1, the maximum flight speeds have been steadily increased as they company tests the plane’s design and structure.

[On October 7th on the fifth manned flight] Chief Test Pilot Tristan “Geppetto” Brandenburg set a record for the XB-1 shod with GE J85-15 turbojet engines, taking it up to 17,800 ft (5,425 m) and as fast as Mach 0.69 (428 knots / 492 mph / 791 km/h, true airspeed) over its 50-minute-long test flight, marking the highest and the fastest it’s flown so far.

Boom tested its flutter excitation system (FES) at Mach 0.6 … which must be unnerving for a test pilot. The FES is a system that deliberately induces vibrations into an aircraft’s airframe to help engineers find potential structural issues, particularly at higher speeds. They do this so structural issues (that could cause flutter) don’t rear their ugly head mid-flight.

The plan is to do five more test flights before attempted to break the sound barrier.

At the completion of this testing the company will then begin manufacture of its full scale supersonic passenger plane, dubbed Overture, that will carry up to 80 passengers and will sell to airlines. It already has contracts and financial support from a number of major airlines, including United and Japan Airlines.

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Boom completes second flight test of one-third-scale prototype supersonic jet

9:28 am

The airplane startup Boom Supersonic on August 26, 2024 successfully completed the second test flight of its one-third-scale prototype XB-1 supersonic jet, taking off from the Mojave Air & Space Port in California.

The flight was manned by the company’s chief test pilot Tristan Brandenburg, and had as its primary engineering goal to test the retraction and deployment of the jet’s landing gear. During the fifteen minute flight the plane climbed to 10,400 feet and a maximum speed of 277 miles per hour.

The test checklist included retracting and extending the undercarriage for the first time, checking the plane’s handling, and the activation of a new digital stability augmentation system for roll damping to help maintain control in stall conditions. In addition, the right wing of the XB-1 was fitted with tufting to monitor the direction and strength of airflow over the wing.

The company plans a 10-flight test program with this prototype, eventually leading to flights exceeding the speed of sound. Boom also claims that its design will reduce the sound of the sonic boom, thus allowing its commercial supersonic jet to fly over land and increasing its commercial value. At the moment it has orders to sell as many as 96 of its full-scale plane to various airlines, including United and Japan.

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Boom’s one-third-scale prototype supersonic jet finally takes off

9:05 am

The private startup Boom has finally flown its third-scale prototype supersonic jet, dubbed XB-1, on its first short flight, taking off on March 22, 2024 from the flight test facility in Mojave, California.

Following behind was Test Pilot Tristan “Geppetto” Brandenburg in a T-38 chase plane to observe the flight and confirm altitude and speed. With a length of 62.6 feet (19 m) and a wingspan of 21 ft (6 m) , the XB-1 achieved an altitude of 7,120 ft (2,170 m) and speeds up to 238 knots (273 mph, 440 km/h) under the force of its three GE J85-15 engines generating a maximum thrust of 12,300 lbs.

According to Boom, once its aerodynamic characteristics and flight worthiness are confirmed, the XB-1 will increase speed until it is flying on later tests in excess of Mach 1.

This prototype supersonic test plane was first unveiled in 2020, four years ago, but runway taxi tests did not begin until 2023. I suspect the Wuhan panic contributed to the three year delay between unveiling and first tests, though this is speculation.

The goal is to build the first commercial superonic passenger plane since the Concorde. At present Boom has a contract from United for fifteen Boom 12-passenger planes, plus development deals with Boeing, and Japan Airlines.

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Boom begins taxi tests of a one-third scale prototype of its proposed supersonic passenger plane

9:35 am

Three years after it first unveiled the XB-1 prototype of its proposed supersonic passenger plane, Boom Supersonic is finally about to begin taxi tests.

At the Mojave Air & Space Port in Mojave in California, Boom has been conducting ground tests of its one-third scale XB-1 prototype supersonic jet as part of its project to develop its Overture supersonic airliner. The latest round has included taxi tests in the run up to its maiden flight.

In addition to the tests, the FAA has granted the XB-1 an experimental airworthiness certificate that will allow the test aircraft to make its first flight with Chief Test Pilot Bill “Doc” Shoemaker and Test Pilot Tristan “Gepetto” Brandenburg at the controls. Along with simulator work, the pilots are practicing with a T-38 trainer that will also act as a chase plane during the flight tests.

When the prototype was first unveiled in 2020 — after several years delay — the company said it planned to begin flight tests in 2021, with the full scale jet flying by 2024. The project has clearly been delayed since then. At the same time, the company has already gotten contracts and financial support from a number of major airlines, including United and Japan Airlines.

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United Airlines buys 15 Boom Supersonic airplanes

9:17 am

United Airlines today announced that it has signed a deal with Boom Supersonic to buy fifteen of its supersonic Overture airplanes.

Under the terms of the agreement, United will purchase 15 of Boom’s ‘Overture’ airliners, once Overture meets United’s demanding safety, operating and sustainability requirements, with an option for an additional 35 aircraft. The companies will work together on meeting those requirements before delivery. Once operational, Overture is expected to be the first large commercial aircraft to be net-zero carbon from day one, optimized to run on 100% sustainable aviation fuel (SAF). It is slated to roll out in 2025, fly in 2026 and expected to carry passengers by 2029.

Boom has been developing this supersonic passenger plane since 2016, though little progress has appeared to take place during most of the last five years. This contract appears to be the company’s first real sale. It also appears that it makes United a partner in the plane’s development.

Meanwhile, another company, Aerion, is developing its own supersonic passenger jet, in partnership with Boeing and scheduled for launch in 2023.

We shall have to wait to see which company wins the race to begin commercial flights.

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Boom unveils its first half-scale prototype commercial supersonic jet

1:48 pm

Boom Supersonic, an aviation company that wants to build commercial supersonic passenger jets, has unveiled its first half-scale prototype, dubbed the XB-1, or “Baby Boom”.

They had announced the development of this jet several years ago, and have experienced some delays since. They had hoped to begin commercial operations of their commercial model, dubbed Overture, by ’23, but this remains unclear. Regardless, there does seem interest in this airplane among the commercial carriers, assuming they survive the Wuhan flu panic.

Boom says that the airliner has a projected unit cost of around $200 million each, not including a customer’s desired interior configuration and other unspecified optional extras. This would make it cheaper than many subsonic widebody airliners now on the market, but those aircraft can also carry substantial more passengers. For example, in 2018, Airbus said that the average price of one of its popular A330-200s was approximately $238.5 million, but that aircraft has a maximum seating capacity of 406, nearly four times that of Overture as presently planned. Boeing says that the average price of one of its 767-300ER airliners is around $217.9 million, but again, those planes can seat nearly 300 passengers, depending on the internal configuration.

There has already been not insubstantial interest in the Overture, though, with Boom saying it has commitments to buy up to 76 of the jets from five airlines, including Virgin and Japan Airlines (JAL). Virgin Group has been a major investor in Boom for years now, as well. The Spaceship Company, a Virgin Galactic subsidiary, was previously reported to be preparing to assist in building and testing the airliners.

I will admit, however, that I do not find it encouraging that Virgin Galactic is involved in the plane’s development. In fact, it might even help explain why development was delayed.

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