"A company with a single glider and low production rate doesn't instill confidence that they can remain viable."

The common theme amongst manufacturers that go bust, gliders or powered, is expanding beyond their means and abilities. There's a very good reason Boeing and Airbus lift their production rates by fractions of an aircraft per month.

From where I sit, Jonkers appears to have provided a masterclass in how to do that. They created a non-aviation income source to fund expansion, formed partnerships with a university and a symbiotic business (M&D), kept their production increases incremental & considered (within their abilities and maintaining a healthy order book). They're presently working on a second model. I'd suggest it to be rather unfair to mention them in the same sentence as Lange.

CJ