I had a welcome email from Dr Jan Zigmund himself, with scans of a most delightful model published in 'Model Hobby', a magazine published in the Czech Republic. I cannot read the Czech script of course (can anybody out there?) but here are the illustrations from the article:
and here is the plan:
Note the angle of the motor, which keeps the exhaust well clear of the model and may explain the lack of scorching - or is this an example of Jan's 'cool running' motors?
I think the article was published some time ago and I would guess construction is is 'paper over balsa' (or Depron). I do not know if it is available as a kit, but it looks a real 'goer' and I look forward to further details from Jan