President Limo - Mercedes-Benz Forum

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post #1 of 15 (permalink) Old 04-08-2003, 06:27 AM Thread Starter
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President Limo

Does anyone know anything about the Cadillac limos that the President of the United States travel in?
I saw a shot of a limo with the door opened, and it looks extremely armoured, probably way past the standard classifications (I think the highest one is P7 or something like that). I wonder what kind of impact these limos are built to withstand. It would be interesting to know who builds these limos, what is the weight, motorization and other modifications. Maybe the details are classified information, but someone might still know something about these cars.

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post #2 of 15 (permalink) Old 06-30-2004, 05:56 AM
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RE: President Limo

Hi

The limos are built by a company called O'GARA Hess and Eisenhardt.

They at Level 6 and beyond....(scale from 1-6) They can withstand direct hits from Bazookas, grenades, gas attacks, and probabyl the fall out of a nuclear explosion (although a direct hit would melt the metal as ground 0 of a nuke must be thousands of degrees. The passengers would literally melt or something.


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post #3 of 15 (permalink) Old 06-30-2004, 01:03 PM
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RE: President Limo

Chuck300 hits the nail on the head with his assessment of what the presidential limo can handle (not including the nuclear fallout - don't know about that).

Car and Driver did an article on the limo a number of years ago. Many aspects of the vehicle, such as weight, are classified. No doubt, there are a few extra goodies of which we are not aware. If memory serves, the engine isn't heavily modified as far as performance goes.

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post #4 of 15 (permalink) Old 06-30-2004, 02:13 PM
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Re: If memory serves, the engine isn't heavily modified as far as performance goes.

I would have thought that given the extra weight, if they want these to move quickly in case of an emergency, the engine would have been beefed up.

About the nuclear blast. The use of a Neutron bomb detonated at low altitude would ensure reuseability of the limos...

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post #5 of 15 (permalink) Old 06-30-2004, 02:31 PM
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RE: President Limo

All I know is you can purchase Mercedes from www.firstdefense.com that can deffinitely take a lickin'
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post #6 of 15 (permalink) Old 07-01-2004, 05:29 AM
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RE: President Limo

I would love to armor my S. but the weight of it would render it useless for me. It would run out of gas instantly and make driving very difficult.

But Maybe one day!!!!


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post #7 of 15 (permalink) Old 07-01-2004, 05:32 AM
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Re: If memory serves, the engine isn't heavily modified as far as performance goes.

I always thought that a direct hit or near by hit of a nuke would heat the surface to sufch a high degree that it would literally MELT the cars shell. Does anyone know the following :

a) How hot ground zero of nuke blast would be?

b) What is the melting point of metal (how hot does it need to be for the metal to liquify

Brad

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post #8 of 15 (permalink) Old 07-01-2004, 08:37 AM
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Temps

Quote:
Chucky300 - 7/1/2004 6:32 AM

I always thought that a direct hit or near by hit of a nuke would heat the surface to sufch a high degree that it would literally MELT the cars shell. Does anyone know the following :

a) How hot ground zero of nuke blast would be?

b) What is the melting point of metal (how hot does it need to be for the metal to liquify

Brad
a) Depends on the yield of which thermonuclear device is used with your choice of Hydrogen Bomb, Uranium Bomb, Plutonium Bomb, and ...

Some devices are fusion based (H-Bomb fuses hydrogen into deuterium and tritium, but uses an outer shell of uranium to increase the yield, so it is also a fission bomb), some fission based.

The first H-Bomb tested by the US in March of 1954 was actually a fission-fusion-fission bomb, and produced a fireball of 4.8 km in diameter!

Anyway. To sustain the fusion process in H-bomb, temperatures for Deuterium-deuterium fusion of 4.0*10^8 K and for Deuterium-Tritium fusion 4.5*10^7 K. These are necessary to brake what is known as the Coulomb barrier whereby particle's electric repulsion needs to be fought to allow nuclear strong force to fuse the particles. Keep in mind that we are only talking about a sphere of about 2 inches in diameter where these temperatures exist.

Check <a href = "http://encyclopedia.thefreedictionary.com/H-bomb"> this </a> for a description of energy released in blast, thermal radiation, ionization radiation and fallout. Note this:

Quote:
Most of the damage caused by a nuclear weapon is not directly related to the nuclear process of energy release, but would be present for any explosion of the same magnitude
hence the conversion in to an equivalent yield in TNT used to rate the devices (in TNT kilotons and megatons).

The yield will determine how high the temperatures reached by the fireball are. For maximum efficiency of the blast's destructive effects, devices are exploded in the air, so the high temps talked about earlier will not occur where the limo sits.

Assume a Russian SS-17 attack in the 80s, at about 1 second after detonation of the 5 warheads in altitude, the fireball is 1.1 mile in diameter, with surface temperature of 6,000° C (10,800° F). At 8 seconds, the fireball has grown to its max size of under 1.3 miles and surface temps are around 2,100°C

b) Depends on the metal. Each has separate characteritics for melting point and sublimation (transformation from solid into gas).
Assuming steel sheet metal, steel melts at around 1,370°C (2500°F), (iron melts at around 1,510°C) so the car could melt, depending on the altitude of detonation, certainly if it was a portable device exploding in the vicinity of the limo.
Steel boils at around 3,000°C, it could theoretically vaporize (but the cost would be very high, above the 6000C mark for a "delta H of vaporization"), but sublimation is not likely to exist for steel.

A cool example of sublimation is "dry-ice"


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post #9 of 15 (permalink) Old 07-01-2004, 08:18 PM
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RE: President Limo

There are some nice shots of the limo in "Fahrenheit 9/11" It took multiple egg impacts during the Inaugural Parade quite effectively.
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post #10 of 15 (permalink) Old 07-01-2004, 08:19 PM
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RE: President Limo

There are some nice shots of the limo in "Fahrenheit 9/11" It took multiple egg impacts during the Inaugural Parade quite effectively.

GW Bush, Duly Appointed Deserter in Chief. Somewhere in Texas a village is missing it's idiot.
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