becomes more critical and construction more difficult. Modeling of airflow around the wings also remains a challenge. The unusual "clap and fling" motion of the DelFlies, where a pair of wings on each side of the body meet each other and then flap apart, is especially difficult
to model. So far, the Micro can fly forwards, but unlike the DelFly II it has yet to master hovering and flying backwards. "We hope to be able to do that this year," says Ruijsink.