Movies and Films
This is the forum for Movie and Film discussions. Again, our topic is naval warfare in WWII for the most part.
RE: U-571 Accuracy
Posted by:
Greg Day-Camp
()
Date: January 04, 2001 05:40AM
<HTML>Oh, but this is fun. . . I just thought of another error (or is it two?). My wife even noticed this one while watching the movie, and she thinks I\'ve dived around the bend when it comes to submarines.
Remember when the Lieutenant orders Harvey Keitel to dive to 200 meters? The Chief, after some argument, takes the boat down. The trouble is that he only orders the planesmen to level out the hydroplanes once the boat reached 200 meters. That would have made the sub shoot below the desired depth. This guy\'s been a submariner for over twenty years?
One question, again regarding the hydroplanes. The Chief orders both the bow and stern planes down, in that same scene, if I remember correctly. Wasn\'t it standard to lower the bow planes and raise the stern planes, thus making the bow sink and the stern rise? That way, the force vector created by the propeller is pointing in the same direction as the boat is going. (I once considered physics as a carrier. . .) By lowering both planes, the boat stays level while descending, as does the force vector of the propeller, which wastes energy. The propeller is having to push the entire keel through the water at a downward slope this way, instead of just the narrow profile of the bow. I think this is right, but somebody say something informed here.</HTML>
Remember when the Lieutenant orders Harvey Keitel to dive to 200 meters? The Chief, after some argument, takes the boat down. The trouble is that he only orders the planesmen to level out the hydroplanes once the boat reached 200 meters. That would have made the sub shoot below the desired depth. This guy\'s been a submariner for over twenty years?
One question, again regarding the hydroplanes. The Chief orders both the bow and stern planes down, in that same scene, if I remember correctly. Wasn\'t it standard to lower the bow planes and raise the stern planes, thus making the bow sink and the stern rise? That way, the force vector created by the propeller is pointing in the same direction as the boat is going. (I once considered physics as a carrier. . .) By lowering both planes, the boat stays level while descending, as does the force vector of the propeller, which wastes energy. The propeller is having to push the entire keel through the water at a downward slope this way, instead of just the narrow profile of the bow. I think this is right, but somebody say something informed here.</HTML>