The Newsarama Blog links to the Slash Films article on the Darth Vader Hot Air Balloon (fully authorized by Lucasfilm).
The Hot Air Balloon’s technical details:
- 26 meters ( 86 feet) high, basket included
- 21 meters ( 69 feet) wide
- 24 meters ( 78 feet) depth
- Estimated hot air volume 3.000 m³ ( 106,000 cubic feet)
- Estimated weight 290 kilos ( 640 lb)