With quadruple engines, twin fuselages and a wingspan of over 140 feet (43m), White Knight Two is capable of carrying Space Ship Two to an altitude of 50,000 feet (15,000m). There, Space Ship Two separates, the rocket boosters kick in and the vessel reaches 361,000 ft (110,000m). For five minutes passengers are weightless before the engines cut and the vessel begins its unpowered glide back to the spaceport. Most of us can't afford the $250,000 price tag of a ticket, but we can keep the dream alive with this model. Skill level: 3. Parts: 45.