Despite tragedy, Virgin Galactic presses on: Bob McDonald

Space tourism company Virgin Galactic unveilsits new spaceplane this week, a successor to one destroyed in a tragic accident in 2014. The company is forging ahead, despite serious setbacks, confident it can make space travel safe for citizens.

The new SpaceShipTwolooks exactly like its predecessor a rocket-powered space plane that is launched at 15,000 metresfrom the belly of a carrier aircraft.

It'sdesigned to take six tourists and two pilots above the atmosphere for a five-minute sub-orbital visit to space. Hundreds of people have signed up for the $200,000 experience, but before anyone flies, the company has to be sure the vehicle is safe.

SpaceShipTwo's innovative design is the brainchild of Burt Rutan, famous for building unusual-looking aircraft, including Voyager, which made the first non-stop round-the-world flight in 1986;Global Flyer, which made the first solo non-stop circumnavigation in 2005;and SpaceShipOne,which won the $10-million X-Prize in 2004 for being the first private rocket to reach space, twice within two weeks.

Rutan believes that getting to space does not have to involve military rocket boosters and capsuleslike those that kicked off the space raceor ultra-expensive space shuttles.

Instead, lightweight, carbon-composite, winged vehicles with hybrid rocket engines should be able to fly to space routinely and cheaply. It's interesting to note that a similar promise was made in the 1970s, when the space shuttles were being designed to replace the giant Apollo moon rockets.

As history has shown, the shuttles were neither cheap nor completely safe, with two out of five destroyed during flight killing 14crew members.

Sadly, fatal accidents are part of the process any time humans have tried to leave the ground, and unfortunately, Virgin Galactic is no exception.

On two occasions, disaster struck, and each time, the company pressed on, wiser for the experience.

During a test firing in 2007, a rocket engine exploded, killing three people and injuring others.The program was put on hold while questions were raised about the safety of the engine on a vehicle designed to carry people. The cause of the accident was investigated and improvements to the engine were made.

Then, during a test flight in 2014, co-pilot Michael Alsbury prematurely deployed a feathering system designed to slow the vehicle on the way downby tilting the tail up at a sharp angle.

But the rocket was still under power at supersonic speed on the way up. The stresses on the airframe caused the spacecraft to break apart, killing Alsbury and injuring pilot Peter Siebold.

Again, the accident raised serious concerns about the safety of the entire space tourism industry.

Butrather than give up in the face of tragedyor scrap the design and start over with a new type of spaceship, the operators felt that the design was sound and they continued to build a replacement equipped with safeguardsso that type of accident cannot happen again.

They will now proceed with a step-by-step test program and will not be ready totake on passengers until they are confident the vehicle is reliable and safe. That is why they are, wisely, not announcing a date for the first commercial flights.

Accidents are a hard reality for the space and aviation industries. While no one wants them to happen, and the loss to family members is unfathomable, accidents point out flaws that were either overlookedor only show up after long-term use.

The only consolation is that out of tragedy comeaircraft that are safer for future fliers. But they are also a grim reminder of how dangerous space travel is, especially in newly designed vehicles.

During the race to the moon in the 1960s, a fire broke out in the Apollo 1 capsule that killed three astronauts and that spacecraft had not even left the ground.

The moon program was put on holdwhile the problem was identified. Faulty wiring, flammable materialsand a pure oxygen environment were to blame for the blaze, along with a hatch that could not be opened from the inside. The problemswerefixed, then NASA continued on to successfully land on the moon.

Virgin Galactic is doing it right by taking their time to follow a step-by-step test program, where no new step is taken until the previous one is totally successful.

In the end, they hope to prove the vehicle is safe for public transit to space. To demonstrate his confidence in the engineers, billionaire Richard Branson, who owns Virgin Galactic, will put his own life on the linewhen he becomes a passenger on one of the first commercial flights.

It's a bold move that everyone will be watching.