B-21 on track for critical design review

The Northrop Grumman B-21 Raider, the new US Air Force stealth bomber, will go through its critical design review before the end of the year, according to the Air Force Rapid Capabilities Office, responsible for managing the programme. While all elements of the programme remain heavily classified – including the number of engines – the design is reportedly going well. There have been reports from congressional sources that it has encountered some problems in areas such as wing design, the engine mounts and the engine intakes. David C Isby