Most folk could mount a plausible explanation of Intake Momentum Drag and its effect if you didn’t play by the rules...everyone’s story on the effect was aligned but the explanation always seemed to be a bit woolly!
In my experience it was because the vane being straight made perfect sense, the speed band of impending disappointment seemed logical - and at some point alpha came into the conversation as a ‘it just does’ ingredient.
Hence most conversations about IMD seemed to end with someone saying ‘Look, let’s not get bogged down in this - just take one element of ‘the triangle’ out and you’ll be fine...’
Still, I suppose it allowed the QFIs to talk knowledgably about something that didn’t include a single weapon system or tactic...😉