AI equiped with Super Brakes?

Keelbuster · 06-19-06, 07:01 PM

What are realistic deceleration values? If a destroyer at ahead flank suddenly goes emergency reverse, how long would it take it to reach 1/3 of it's forward speed? In my mind it should be FAST, due to the wicked friction of the ocean. However, my opinion has been generated by the SH3 physics engine...

Kb

Kruger · 06-20-06, 02:43 AM

Quote:

Originally Posted by Keelbuster

What are realistic deceleration values? If a destroyer at ahead flank suddenly goes emergency reverse, how long would it take it to reach 1/3 of it's forward speed? In my mind it should be FAST, due to the wicked friction of the ocean. However, my opinion has been generated by the SH3 physics engine...

Kb

I somehow doubt that a destroyer running at 33 knots would be able to reverse his propellors instantly, in part because of the geering boxes, and in part due to the fact that it would risk fracturing the shafts and propellors. Not to mention that everyone on board would have to wear some seat belts

)

The Noob · 06-20-06, 04:12 AM

This Reminds me of Spaceballs...

Sandurz: We can't Stop, it's to Dangerous! We've got to Slow down First!

Dark Helmet: Bullsh!t! Just stop this Thing! I order you: STOOOOOOOOOOOOP!

:rotfl::rotfl::rotfl:

Khayman · 06-20-06, 04:35 AM

Perhaps they have a primitive form of the inertial dampeners they use in Star Trek. The ones that enable the ship to go from zero to faster than the speed of light in an instant without the crew being splatters of blood and gore on the walls. Would make a good, if rather short, episode if they didn't have them.

Keelbuster · 06-20-06, 08:33 AM

Quote:

Originally Posted by Kruger

Quote:

Originally Posted by Keelbuster

What are realistic deceleration values? If a destroyer at ahead flank suddenly goes emergency reverse, how long would it take it to reach 1/3 of it's forward speed? In my mind it should be FAST, due to the wicked friction of the ocean. However, my opinion has been generated by the SH3 physics engine...

Kb

I somehow doubt that a destroyer running at 33 knots would be able to reverse his propellors instantly, in part because of the geering boxes, and in part due to the fact that it would risk fracturing the shafts and propellors. Not to mention that everyone on board would have to wear some seat belts

)

Har - yea. The forces against the machinery could be great. On the other hand, the ocean has a lot of give against the propeller, right? I assume that this would dampen things a bit. It's not like the road against a tire (throwing yer tranny into reverse at high speed). Also - how fast is 40kts in kph (i.e. land vehicle speed)? A knot is like a mile, is it like a mile/hour? If so 40kts = ~65kph or so? At that speed slowing down a third of your speed isn't that severe (though I usually wear a seatbelt anyway). Maybe I've got the numbers all wrong. How fast do warships go, compared say, to cars?

I guess the issue is that the destroyers in this game have a virtually instantaneous reduction in speed, which is probably impossible.

Kb

06-20-06, 10:53 AM

First the captain would have to give the order "All reverse full!". Then the lee helmsman (the guy manning the engine telegraph) has to yank the levers all the way forward and back again, which sounds the alarm on the telegraph in the engine room, and set it to all reverse full. Then the chief engineer has to shout the order to the guy manning the throttles. After that the chief does the same with his telegraph to tell the bridge he got the order right. At the same time the engineer on the throttles has to disengage the transmission (old ships with reciprocating engines would have had to bring them to a halt and reverse them, but that's old technology. Steam turbines have to run at high speeds to be efficent, so they have gears for lower speeds and reverse). Once the engines are disengaged they have to wait for the propellors to come to a halt. Then they engage the reverse gears and go for it.

All told if the crew are good enough then a destroyer should come to a compete stop in about two minutes.

Kruger · 06-20-06, 12:56 PM

Well, thank you Steve...

Actually, destroyers were (and still are I think) the fastest anf most agile machines, taking in account their weight and dimensions. I once spoke with a venerable gentleman who serverd on an american destroyer in the Royal Navy, and amongst other things, he told me that when a ship blew up in their convoy, or the alarm was given that a submarine was in the area, you could not stand on you feet on the deck when the ship was accelerating to full ahead and zigzaging in the same time.

LE...thank Lord I'm not a bilge rat anymore

)

06-19-06, 07:01 PM	#1
Keelbuster Ace of the Deep Join Date: Oct 2005 Location: BA 72 Posts: 1,092 Downloads: 43 Uploads: 0	What are realistic deceleration values? If a destroyer at ahead flank suddenly goes emergency reverse, how long would it take it to reach 1/3 of it's forward speed? In my mind it should be FAST, due to the wicked friction of the ocean. However, my opinion has been generated by the SH3 physics engine... Kb __________________

06-20-06, 04:12 AM	#3
The Noob The Old Man Join Date: Sep 2005 Location: de_dust2 Posts: 1,417 Downloads: 0 Uploads: 0	This Reminds me of Spaceballs... Sandurz: We can't Stop, it's to Dangerous! We've got to Slow down First! Dark Helmet: Bullsh!t! Just stop this Thing! I order you: STOOOOOOOOOOOOP! :rotfl::rotfl::rotfl:

06-20-06, 04:35 AM	#4
Khayman Lieutenant Join Date: Apr 2005 Location: Scotland Posts: 258 Downloads: 2 Uploads: 0	Perhaps they have a primitive form of the inertial dampeners they use in Star Trek. The ones that enable the ship to go from zero to faster than the speed of light in an instant without the crew being splatters of blood and gore on the walls. Would make a good, if rather short, episode if they didn't have them.

06-20-06, 10:53 AM	#6
Sailor Steve Stowaway Posts: n/a Downloads: Uploads:	First the captain would have to give the order "All reverse full!". Then the lee helmsman (the guy manning the engine telegraph) has to yank the levers all the way forward and back again, which sounds the alarm on the telegraph in the engine room, and set it to all reverse full. Then the chief engineer has to shout the order to the guy manning the throttles. After that the chief does the same with his telegraph to tell the bridge he got the order right. At the same time the engineer on the throttles has to disengage the transmission (old ships with reciprocating engines would have had to bring them to a halt and reverse them, but that's old technology. Steam turbines have to run at high speeds to be efficent, so they have gears for lower speeds and reverse). Once the engines are disengaged they have to wait for the propellors to come to a halt. Then they engage the reverse gears and go for it. All told if the crew are good enough then a destroyer should come to a compete stop in about two minutes.

06-20-06, 12:56 PM	#7
Kruger Commander Join Date: Jun 2006 Posts: 476 Downloads: 21 Uploads: 0	Well, thank you Steve... Actually, destroyers were (and still are I think) the fastest anf most agile machines, taking in account their weight and dimensions. I once spoke with a venerable gentleman who serverd on an american destroyer in the Royal Navy, and amongst other things, he told me that when a ship blew up in their convoy, or the alarm was given that a submarine was in the area, you could not stand on you feet on the deck when the ship was accelerating to full ahead and zigzaging in the same time. LE...thank Lord I'm not a bilge rat anymore )