Entwicklungsring Nord
(重定向自ERNO)
The Entwicklungsring Nord (Northern development circle) - abbreviated ERNO - was a 1961 joint venture of Bremen-based Weserflug and Focke-Wulf with Hamburger Flugzeugbau to develop parts for rockets and get involved in space activities.
In 1961 work began on a small, jet-powered transport aircraft initially styled Erno-61-4.