OD is for overdose; e.g. recreational drug reference; in Oldcrow's case caffeine. Never tried any wacky backy?
Sorry Tomo, you don't have to answer that and I'm straying off topic here!
I remember once seeing a film about the Arrow story with some of Canada's great actors in it and Dan Aykroyd. Apparently they built some full scale mock ups for the film. It was pretty corny, but it told the story quite well, using models for the flying sequences. There was a documentary on the dvd as well which was almost as long as the film, but included interviews from personnel from Avro Canada who built it. I think it featured an interview with Jan Zurakowski, who flew the Arrow for the first time. Great pilot, that guy.