Traditionally in aircraft design, you can't rely on adhesives for primary structural integrity. It's mainly because it's hard to ensure you glued right, it's ha

Traditionally in aircraft design, you can't rely on adhesives for primary structural integrity. It's mainly because it's hard to ensure you glued right, it's hard to inspect. Also we don't like it too much because it's harder to repair. Adhesives are used, but normally for secondary structure, or as reinforcement to fasteners. So for example you'd ensure that a failure of the adhesive wouldn't lead to catastrophic failure, but it may lead to early cracks that would be detected in regular maintenance. In the case of Boom they seem to rely more on adhesives than the traditional airframe methods. At the same time they are making a one-off demonstrator here, so they can afford to choose methods that need particular care and inspection, even if it would be unrealistic to expect that level of quality on a real production line.