Factual error: Most uniforms in this movie are worn incorrectly. Between wearing belts incorrectly, not wearing ribbons on dress uniform (shore patrol), female hair regulations, shoes, and having ribbons in the wrong order it's like they didn't even try.
Down Periscope (1996)
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Directed by: David S. Ward
Starring: Bruce Dern, Kelsey Grammer, Rip Torn, Rob Schneider, Harry Dean Stanton, Lauren Holly
Genres: Comedy
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More mistakes in Down Periscope
Pascal: Jesus, Buckman! This stuff has been on the Stingray since Korea! This can expired in 1966!
Buckman: What's the matter, sir? It still tastes like cream corn.
Pascal: Except it's deviled ham.
Trivia: In the scene when Lauren Holly, gives Kelsey Grammer, a kiss, her hitting her elbow was not in the original script. She really did hit her "funny bone" before walking off camera. The director had decided to keep it in the movie so they had to film an alternate shot of Grammer, laughing when it happened.
Question: Would pouring whiskey into the tank have really thinned down the mix, giving the submarine more speed?
Answer: Adding alcohol to gasoline can lower the fuel's viscosity, thinning it to flow more easily. It can only marginally increase an engine's speed and power.
raywest ★
But the question was, would it have actually increased the sub's speed?
Thinning the fuel mix would not increase energy or performance, so it would not make the submarine faster.
Technically, yes, diesel with alcohol burns better. As for what happened in the movie: no. Whiskey is not alcohol; it's water with alcohol, and the water reduces the flammability a lot. Also, a sub has fuel tanks that hold tens of thousands of gallons; adding a few ounces of whiskey will not have any effect at all.