HMCS Bras d'Or's trial program was abruptly cancelled on 2 November 1971 by Minister of National Defence Donald S. Macdonald, attributing it to a change in defence priority (from anti-submarine warfare to sovereignty protection).is cobblers. The Canadian Armed Forces were still concentrated on anti-submarine warfare throughout the 70s and 80s. 1988 they had 23 ASW Destroyers and Frigates, 18 Canada-eh versions of the Orion, 18 S-2 Trackers, 35 Sea King helos.
HMCS Arm of Gold was clearly though up by someone on heroin. How was it supposed to detect Subs while travelling at 60 kts? Stop and deploy sonar? A ship launched helo could do that and would be faster.
And packed with engines and fuel only it had limited range. A Tracker/Orion carrying sensors and weapons had a longer range and was also faster.
Good points, probably why they cancelled it. Would have been useful in a world without aircraft maybe.