# 144,000 horsepower

A look at the current - and past - state of the U.S.S. United States.
http://www.popularmechanics.com/technology/transportation/4263478.html?page=2
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wrote:

That is one SHARP bow profile. Yikes.
-Zz
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Which is how/why she could do 44kts(50mph), which is pretty much hauling ass for anything that size in the water.
Zz Yzx wrote:

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Funny thing is, that she would probably do 42 kts with 50,000 HP and the next 2 knots would take 3 times as much. Such is the rule of displacement vessels. To take that one theoretical step further, if they wanted to go 46 knots, they's need 400,000 HP. 47kt 1 million. 50 kts a bezllion HP
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Robatoy wrote:

I think 55 knots or so is the theoretical maximum a vessel can move through the water, irrespective of the power pushing it.
As the speed increases, the vessel begins to outrun its bow wave. It then has to ride over the bow wave or push through it. The faster the vessel, the bigger the bow wave.
Sort of like the increase in mass with velocity and, as the velocity approaches the speed of light, the mass becomes infinite. Only not exactly.
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The maximum speed of a displacement vessel is determined by its length. The longer, the faster.... with the same power.
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"Robatoy" wrote:
The maximum speed of a displacement vessel is determined by its length. The longer, the faster.... with the same power. -----------------------------
Theotretical limit for a displacement is (1.4)*(square root of design waterline length in feet)
Lew
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Zactly. Many folks also don't get it when you tell them that it takes less power to drag an equilateral triangle shape through the water by the flat end than by the pointy end. The drag is called drag for a reason. Wanna make a trailer (As in tractor/trailer van) more efficient? Put a cone on the back end... not the front.
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Nope. not even close
Currently, unlimited power-boat races are in the 160MPH range. in years past, they got up into the 200 MPH range, but engine/fuel restrictions have brought the speeds down.
'Cigarette' boats can reach 80+knots in calm water.
Some torpedoes -- which travel entirely underwater -- have sustained speeds well over 100 knots.
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Robert Bonomi wrote:

unlimiteds aren't displacement boats, they're hydroplanes. Cigarette boats are also on plane at speed and therefore not displacement vessels. My physicist buddy that does torpedo testing says max speed for a conventional torpedo is 55 knots, but supercavitating torpedoes are capable of much higher speeds by essentially traveling in a gas bubble and are therefore also not technically [water] displacement devices.
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I'll simply suggest that _something_ is moving the water out of the way, be it the torpedo body or the 'gas bubble'. Else an elementary fact of physics is being violated. *OR* somebody has managed to implement the tunnel diode at a macro scale. <grin>
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On 3/10/2010 10:39 PM, Doug Winterburn wrote:

Your physicist buddy is playing word games. The torpedo is going so fast that flow detaches from its surface at the transition from the nose cone to the body. But it is most assuredly travelling in water.
In any case the British seem to be laboring under the misconception that their Spearfish torpedo can exceed 60 knots. Perhaps he should call them and inform them of their error.
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On Wed, 10 Mar 2010 20:39:38 -0700, the infamous Doug Winterburn

I can't wait to see the next hydroplaning aircraft carrier!

-- There is no such thing as limits to growth, because there are no limits to the human capacity for intelligence, imagination, and wonder. -- Ronald Reagan
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One of my all-time favourite photographs:
Raw energy at it's glorious finest
http://i123.photobucket.com/albums/o290/Robatoy/WHeeee.jpg
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wrote:

Here, hold my beer...
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On Thu, 11 Mar 2010 09:21:37 -0800 (PST), the infamous Robatoy

Cool. Is that thing listing from just going over a humongous swell, or what?
Here's mine. (Dad was an Air Force pilot; this isn't him.)
http://www.anomalies-unlimited.com/OddPics/Images/sonicboom.jpg
More "power of nature" shots I love:
http://tinyurl.com/ygoavfz trees live on
http://tinyurl.com/c8zkx7 lightning (no "e", guys)
http://tinyurl.com/y9t447t Niagra frozen 1911 (pre-AGWK)
http://tinyurl.com/6jq8w8 we left Anchorage 10 years before the quake
And last but not least, 100 stunning pics everyone should see. There are some real doozies here: http://tinyurl.com/y9oha8e
-- There is no such thing as limits to growth, because there are no limits to the human capacity for intelligence, imagination, and wonder. --Ronald Reagan
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wrote:

Think skid (notice the bubbles off the bow). The swell is his.

Vapor condensing. I've seen some amazing pictures similar to this.

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Thanks for that. She also runs the website
http://www.furrytalk.com /
which has huge numbers of cute animal pictures.
My wife is a big fan of both nature and snimal pictures. This stuff will get sent out through a vast network of folks who apprciate this sort of thing.
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On Thu, 11 Mar 2010 20:10:15 -0500, the infamous "Lee Michaels"

Awwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww! ;)
Did you know: that a baby giraffe is born over 6' off the ground and its mother dumps it on its head at birth? She can't squat so the baby has a very hard time starting out in the world.
-- There is no such thing as limits to growth, because there are no limits to the human capacity for intelligence, imagination, and wonder. --Ronald Reagan
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On Thu, 11 Mar 2010 18:31:43 -0600, the infamous
following:

Wull, ya just don't "whip a U-ey" in a boat which takes a mile and a half to stop or turn.

Yeah, me, too, but this was the first and best I've seen.
-- There is no such thing as limits to growth, because there are no limits to the human capacity for intelligence, imagination, and wonder. --Ronald Reagan
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