You've got that right! I always know immediately when I hear those engines. There's no mistaking it for any other plane
The RCNVR in WW2 operated motor torpedo and motor gun boats in the English channel that were powered by 4 V12 Rolls Royce merlin marine engines, burning 100 octane aviation gas. Thats about 4000 horsepower in a 110 foot long wooden speed boat, armed with 2 torpedoes, and a number of 6 pounder quick firing guns, plus twin 50 caliber machine guns and Vickers heavy machine guns. Top speed of around 35 miles an hour. Their mission was to go out at sunset, cross to the French coast, and lay in wait for a German coastal convoy to come into range. Floating in the dark with their engines shut down the 4 boats in the squadron were just about invisible. The German S boats were their adversaries.
The Canadian officers had been power boat owners pre war, but now they were facing the nightly dangers of attacking much bigger ships in the dark at ranges of less than 300 yards. Target sighted, green 20, all boats, engage! Crash start of 16 V12's, and then bringing the guns to bear and running in so close that the Germans couldn't depress their deck guns enough to hit the fast boats. Red and green tracers, star shells to illuminate the convoy, blowing through all guns blazing, then reverse course and come back in with torpedoes launched, then gone in a minute.
Later in the war the Canadians were sent to support the invasion of Italy in August of 1943. They navigated from the south coast of the UK down the coasts of France and Spain and into The Med and to Sicily. Remember these boats were only 110 feet long, and they were navigating using coastal charts and astral navigation for a 2500 mile voyage. In the last year of the war, the Canadian motor torpedo boats found them selves in the Adriatic Sea along the cost of Yugoslavia, assisting the partizans with their fighting against the Germans that were occupying their country. Along way from home in Canada.