sentences:  "Aurora", "Patrician" and "Patriot" performed a training cruise to the West Indies in spring/summer 1921.During a visit to Puntarenas, Costa Rica, the Canadian vessels supported negotiations by the Royal Bank of Canada in a dispute over oil with the Costa Rican government.In September 1921, "Patriot" assisted Alexander Graham Bell's hydrofoil research by towing his high speed experimental hydrofoil "HD-4".