Nice pic of the USS Harry S. Truman running trials.

[dennilfloss]

I find it funny that "Hauling ass" for a ship is about 30-35mph.

All other things being equal... If you look at the Admiralty Coefficient equation, the power needed to take a ship of a certain tonnage to a certain speed is proportional to the cube of the desired speed. So to go from 30 knots to 35 knots, your shaft power needs to increase proportionally from 27000 to 42875, meaning you'd need 1.6 times the horse power for an increase of 5 knots. And that's a definite underestimate since I'm using an index of 2 (meant for a ship going at medium speed) so it gets worse for going at high speed since the resistance increases and the index therefore also goes up. Maybe 'n' reaches 3 for such speeds and then the shaft output needed is proportional to the power of 4 instead of to the cube.

 

[Exterous]

 

[dennilfloss]

Every time I see weee, my mind goes back to gonads and strife.

NSFW probably.

https://www.youtube.com/watch?v=6A0p-U1LBbQ

 

[KMFJD]

1 knot = 1.15 mph just an FYI...so 38 knots is about 44 mph. More amazing about that is the ship can maintain that speed for days or for however long it takes to deplete the reactors.

Another story hehehe: submarine I was on, did a high speed run from Norfolk to the Mediterranean in a little more than a 1 week and half, stopping every once in awhile to get our bearings. (if I remember correctly)

Don't they basically have to carve the ship open to refuel the reactors?

 

[DrPizza]

Don't they basically have to carve the ship open to refuel the reactors?

I wish I could tell you how. But, I'm not exactly sure.
We had a nuclear engineer (lol) from the Navy visit my classroom a couple years ago. He talked about refueling the reactors. He also explained to my physics students how the jets go from one end of the deck to the other in zero point zero one milliseconds when they are launched. I glanced at the class & was happy to see lots of scrunched up eyebrows - but they all remained polite as the Navy recruiter pretended he was an engineer. The next class, I let the kids talk about all the errors they caught.

 

[Exterous]

Every time I see weee, my mind goes back to gonads and strife.

Don't they basically have to carve the ship open to refuel the reactors?

Pretty much:
http://articles.dailypress.com/2012-10-22/business/dp-nws-enterprise-museum-20121021_1_aircraft-carrier-nuclear-reactors-nimitz-class-carriers

I heard some rumors this isn't true of the Ford class but I don't know if thats true or not

 

[alkemyst]

read title as Nude Harry S Truman Running.

left disappointed.

 

[Gibsons]

Pretty much:
http://articles.dailypress.com/2012-10-22/business/dp-nws-enterprise-museum-20121021_1_aircraft-carrier-nuclear-reactors-nimitz-class-carriers

I heard some rumors this isn't true of the Ford class but I don't know if thats true or not

Refueling isn't the same thing as removing the reactor. Not saying it's simple, but the link is about decomissioning a ship/removing the whole reactor.

 

[SunnyD]

All other things being equal... If you look at the Admiralty Coefficient equation, the power needed to take a ship of a certain tonnage to a certain speed is proportional to the cube of the desired speed. So to go from 30 knots to 35 knots, your shaft power needs to increase proportionally from 27000 to 42875, meaning you'd need 1.6 times the horse power for an increase of 5 knots. And that's a definite underestimate since I'm using an index of 2 (meant for a ship going at medium speed) so it gets worse for going at high speed since the resistance increases and the index therefore also goes up. Maybe 'n' reaches 3 for such speeds and then the shaft output needed is proportional to the power of 4 instead of to the cube.

That's a trick question. There's only one matter-antimatter intermix ratio!

:sneaky:

 

[Linflas]

I was on the Indy (CV-62) when they took her out to do some required trials like that. It was a blast when they ran it wide open and did those turns.

 

[Exterous]

Refueling isn't the same thing as removing the reactor. Not saying it's simple, but the link is about decomissioning a ship/removing the whole reactor.

Whoops
<- Reading comprehension failure. I read his post as asking about removing not refueling
I has a fail

 

[velillen]

Don't they basically have to carve the ship open to refuel the reactors?

Yes and no. For an aircraft carrier they have to cut out a section of the "roof" which is basically just the hanger deck. That provides access to be able to refuel/defuel. So its not a huge area that has to come out. The hanger decks are large enough to be able to do most work from there with just the hull cuts and soft patch accesses. Im not to familiar with the carrier refueling since norfolk does it all but thats the basics of it.

Submarines on the other hand....they do cut the entire top off the reactor off. Put a huge 40 foot tall tower over it and do all the refueling/defueling work in there. Then when done they take the tower off and reweld the cut section (which is a good 40 feet long) section of hull back on. Takes a good 8 months. Its pretty impressive as they dismantle pretty much the entire reactor head in order to do this. Not work i want ot do though since the oversight is crazy. Basically an engineer reads you a step (for example, insert bolt A into hole AB), you repeat the step to him, he confirms it, then you do that step. THen go to Bolt B into Hole B in same process

I heard some rumors this isn't true of the Ford class but I don't know if thats true or not

The ford class isnt even out yet (for all practical purposes). With life spans of 40-50 years i highly doubt they have even considered what to do with them left alone cut them up. Hell we are still trying ot figure out how to do the enterprise.