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"He was there, so this is no sh!t:"SaintsWillWin wrote: A site I was on posed the question of the top speed of a USN nuclear carrier; below is a response.
I did hear a story once from a very old hand, many, many years ago, about the time USS Theodore Roosevelt got into a race with USS Pegasus. He was there, so this is no sh!t:
According to the guy who told me, the ship's captain at the time was a former RA-5C Vigilante pilot, and he still had his need for speed.
So the two ships were operating in the same formation, when the Captain of the Pegasus kicked in the gas turbine, put the ship on her foils, and sped away.
The Captain of the TR saw this, and ordered the ship's top speed, and was still unable to catch the hydrofoil.
He started calling down to the engineering plants, and after making a lot of incredibly unorthodox changes in plant lineup, the ship was able to not only catch and pass the Pegasus, but did so with such a massive bow wave generated that it damaged the foils on the smaller ship, and she had to put in for repairs.
Steve Crandell wrote: One thing I don't understand is why cavitation would limit maximum speed. Don't surface ships cavitate most of the time? I know that on SSNs we tried not to cavitate, but if necessary we could increase speed well beyond the point of cavitation, depending on the depth we were at ... we would just be a lot noisier if we did. Of course, the deeper you go, the higher the shaft rpm where cavitation begins.
The point being "where are the bubbles being generated, and can the water-flow keep them clear of the prop blades"?pilikia wrote: Cavitation builds up as the propeller speed increases. The power the propeller can put into the water decreases as it does. At some point, the point will be reached that more propeller speed just creates more cavitation and no more power into the water. Heck, at some point (theoretically) I bet you could have a super-cavitating prop putting absolutely no power into the water in terms of usable thrust.
I agree that CVN speeds are probably grossly exaggerated, but they do make high speed redeployments without escorts or with only one, which they slow to refuel daily. To say they "can't out-pace the safety of their escorts" is simply not true.Rmor wrote: The nuclear carriers are designed for a fleet speed and it's just over 30 knots. There's no point in going to the trouble and expense of making them faster as what would be the point? They can't out-pace the safety of their escorts.