What a hoot! While obviously dated, I thoroughly enjoyed watching this. And, after being owned by a pair of DD-671s, I recognized virtually all that was shown on the video, albeit at a significantly smaller scale! A couple of take-aways for me:
a. While produced by a Danish company, the narrator's English is better than mine! Guess that shouldn't surprise me. My Danish cousins often embarrass me with their command of the English language.
b. Enjoyed the description of the PV diagram. Again, dated instrumentation, but the PV diagram shown, and the description of the process, is right on the money.
c. Too bad modern environmental issues doomed the 2-stroke cycle diesel engines in recreational use. I won't comment if this is good or bad, but bemoan the loss of inherently simple engines.