MOJAVE, 15 JUNE 2011: More exciting news from the Mojave Desert this morning with confirmation that SpaceShipTwo, VSS Enterprise, had completed two successful glide flights within 24 hours.
This was the quickest turnaround time yet between VSS Enterprise solo flights, reinforcing the unique and transformational ability of Virgin Galactic’s spaceflight system to undertake daily flights to space.
Both flights saw early morning take-offs for VSS Enterprise, in mated configuration with the WhiteKnightTwo carrier aircraft, followed by high altitude releases at around 52,000ft and glides back to smooth touch-downs on the Mojave Air and Spaceport runway. Both flights were part of a continuing program of envelope expansion, specifically focussing on speed and susceptibility for flutter.
This morning’s flight was the 12th solo flight for SpaceShipTwo since its inaugural glide flight on 10th October 2010, including two successful “feather” flights which demonstrated the spaceship’s unique re-entry configuration.
The quick turnaround between the latest two flights demonstrates an important factor in Virgin Galactic’s planned commercial operations, which will see daily flights of both carrier aircraft and spaceship to accommodate the fast growing demand from both space tourists and researchers.
Congratulations to the whole team at Scaled Composites and particularly to SpaceShipTwo test pilots Pete Siebold, Doug Shane, Mark Stucky and Clint Nichols.
More exciting news from Mojave this morning! At 7am, SpaceShipTwo touched down safely having completed a second “feather” flight.
One further glide flight, potentially within the next week or so, will see the completion of an unprecedented period of successful test flight activity (six flights in around a month) and herald the start of a couple of months of slightly less visible activity.
Scaled has amassed a wealth of data and experience from the recent flurry of test flights which is now undergoing thorough analysis. Engineers will be addressing any issues arising from this, as well as performing detailed vehicle checks as they prepare the spaceship and carrier aircraft for the next phase of flight testing.
Congratulations to the whole team at Scaled for the dedication and hard work that has made so many flights possible in such a short time period.
Rocketeer comments: There is speculation as to whether the 'couple of months of ... less visible activity' involves integration of the hybrid motor, so that the 'next phase' of flight tests will be powered flights.
Early on Wednesday 4th May 2011, in the skies above Mojave Air and Spaceport CA, SpaceShipTwo, the world’s first commercial spaceship, demonstrated its unique reentry ‘feather’ configuration for the first time. This test flight, the third in less than two weeks, marks another major milestone on the path to powered test flights and commercial operations.
SpaceShipTwo (SS2), named VSS Enterprise, has now flown solo seven times since its public roll-out in December 2009 and since the completion of its ground and captive -carry test program.
This latest flight saw a 6:43AM (local) runway take off for VSS Enterprise, attached to its WhiteKnightTwo (WK2) carrier aircraft, VMS Eve. At the controls of the of the spaceship were Scaled Composites’ test pilots Pete Siebold and Clint Nichols whilst Mark Stucky, Brian Maisler and Brandon Inks crewed the purpose built, all composite, twin fuselage WK2.
After a 45 minute climb to the desired altitude of 51,500 feet, SS2 was released cleanly from VMS Eve and established a stable glide profile before deploying, for the first time, its re-entry or “feathered” configuration by rotating the tail section of the vehicle upwards to a 65 degree angle to the fuselage. It remained in this configuration with the vehicle’s body at a level pitch for approximately 1 minute and 15 seconds whilst descending, almost vertically, at around 15,500 feet per minute, slowed by the powerful shuttlecock-like drag created by the raised tail section. At around 33,500 feet the pilots reconfigured the spaceship to its normal glide mode and executed a smooth runway touch down, approximately 11 minutes and 5 seconds after its release from VMS Eve.
All objectives for the flight were met and detailed flight data is now being analysed by the engineers at Scaled Composites, designers and builders of Virgin Galactic’s sub-orbital spacecraft.
George Whitesides, CEO and President of Virgin Galactic, said: “This morning’s spectacular flight by VSS Enterprise was its third in 12 days, reinforcing the fast turnaround and frequent flight-rate potential of Virgin Galactic’s new vehicles. We have also shown this morning that the unique feathering re-entry mechanism, probably the single most important safety innovation within the whole system, works perfectly. This is yet another important milestone successfully passed for Virgin Galactic, and brings us ever closer to the start of commercial operations. Credit is due to the whole Scaled team, whose meticulous planning and great skill are changing the course of history.”
Pete Siebold, who along with Clint Nichols piloted the spaceship added:
“In all test flight programs, after the training, planning and rehearsing, there comes the moment when you have to go up there and fly it for real. This morning’s flight was a test pilot’s dream. The spaceship is a joy to fly and the feathered descent portion added a new, unusual but wonderful dynamic to the ride. The fact that it all went to plan, that there were no surprises and that we brought VSS Enterprise back to Mojave safe and sound is a great testament to the whole team.”
Wing Feathering for Re-Entry
Perhaps the most innovative safety feature employed by SpaceshipOne and now SpaceShipTwo is the unique way it returns into the dense atmosphere from the vacuum of space. This part of space flight has always been considered as one of the most technically challenging and dangerous and Burt Rutan was determined to find a failsafe solution which remained true to Scaled Composite’s philosophy of safety through simplicity. His inspiration for what is known as the feathered re-entry was the humble shuttlecock, which like SpaceShipTwo relies on aerodynamic design and laws of physics to control speed and attitude.
Once out of the atmosphere the entire tail structure of the spaceship can be rotated upwards to about 65º. The feathered configuration allows an automatic control of attitude with the fuselage parallel to the horizon. This creates very high drag as the spacecraft descends through the upper regions of the atmosphere. The feather configuration is also highly stable, effectively giving the pilot a hands-free re-entry capability, something that has not been possible on spacecraft before, without resorting to computer controlled fly-by-wire systems. The combination of high drag and low weight (due to the very light materials used to construct the vehicle) mean that the skin temperature during re-entry stays very low compared to previous manned spacecraft and thermal protection systems such as heat shields or tiles are not needed. During a full sub-orbital spaceflight, at around 70,000ft following re-entry, the feather lowers to its original configuration and the spaceship becomes a glider for the flight back to the spaceport runway.