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Like rocket sleds?

sferrin

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http://www.youtube.com/watch?v=Kjxk8qIEoWA

Includes a good shot of an F-111 escape module test (guarantee if Hollywood saw it we'd see the concept used in the next alien invasion movie). Good Trek music there too (well maybe not but it sure sounds like TOS music to me ;D )
 

Michel Van

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impressing

and how to use a rocket sled today TV ?
[flash=200,200]http://www.youtube.com/watch?v=aSVfYwdGSsQ[/flash]
 

sferrin

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Michel Van said:
impressing

and how to use a rocket sled today TV ?

Yeah there's another one where they split a car in two with a rocket sled.
 

ohpossum

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Awesome! This is the first I've ever seen of Col. Stapp speaking in film. Anyone who drives or rides in a car or truck has reason to be thankful for his work.

http://www.af.mil/information/heritage/person.asp?dec=&pid=123006472

"Stapp's Ironical Paradox - "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle.""
 

shockonlip

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Rocket sleds are also currently the fastest land based vehicles.

Record currently held by a Holloman sled at 9000 + ft/sec (Mach 8.5).
 

sferrin

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shockonlip said:
Rocket sleds are also currently the fastest land based vehicles.

Record currently held by a Holloman sled at 9000 + ft/sec (Mach 8.5).

There's footage of that run on youtube. (I'd love to know the details of the "Roadrunner" motors they used to power two of the stages.)
 

robunos

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http://www.af.mil/information/heritage/person.asp?dec=&pid=123006472


And from the above,here's another derivation of 'Murphy's Law'....

"Stapp is also credited with coining one of the most famous phrases in American history. One of his assistants, Capt. Edward A. Murphy Jr., rigged a harness incorrectly and it failed to register the strains Stapp was being subjected to. After he discovered what happened, Stapp observed that "Whatever can go wrong, will go wrong." It's been called "Murphy's Law" ever since."


cheers,
Robin.
 

bobbymike

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sferrin said:
shockonlip said:
Rocket sleds are also currently the fastest land based vehicles.

Record currently held by a Holloman sled at 9000 + ft/sec (Mach 8.5).

There's footage of that run on youtube. (I'd love to know the details of the "Roadrunner" motors they used to power two of the stages.)

The chemical makeup of the energetic material would be interesting. 9000 ft/sec is 60% of the speed of detcord (pure explosives) so the propellant must be, I'm speculating, a very high percentage of HMX/RDX or CL20 (or other HEDM).

Interestingly 9000ft/sec coverts to about 2.75km/sec and MDA is talking about 3.5km/sec boost phase air and ship based interceptors. That would be close to 11,550ft/sec.

We are obviously talking cutting edge propulsion systems.
 

sferrin

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bobbymike said:
sferrin said:
shockonlip said:
Rocket sleds are also currently the fastest land based vehicles.

Record currently held by a Holloman sled at 9000 + ft/sec (Mach 8.5).

There's footage of that run on youtube. (I'd love to know the details of the "Roadrunner" motors they used to power two of the stages.)

The chemical makeup of the energetic material would be interesting. 9000 ft/sec is 60% of the speed of detcord (pure explosives) so the propellant must be, I'm speculating, a very high percentage of HMX/RDX or CL20 (or other HEDM).

Interestingly 9000ft/sec coverts to about 2.75km/sec and MDA is talking about 3.5km/sec boost phase air and ship based interceptors. That would be close to 11,550ft/sec.

We are obviously talking cutting edge propulsion systems.

If you can stand all the pop-ups globalsecurity finally updated some of the missile defense info on their site (you only get 8-page views a month now unless you want to pay for it though). The one to look at is here:

http://www.globalsecurity.org/space/systems/hedi.htm

Over on the right there are several links to endoatmospheric programs that were follow-ons to HEDI. I've not seen much on any of them beyond what's on those pages (and since I'm not willing to pay 8$/month for a spam assault I won't see them again until next month). I've seen other hints at things they've played around with but not much in the way of details. There's a brief write-up of HiBEX in which they refer to the use of external burning (achieving 800-1000isp IIRC) for manuevering terminal-phase ABMs in the atmosphere in a seperate program. (Come to think of it they mentioned external burning in another application in that book "Lightning Bolts".) They also looked at the possiblity of running down manuevering ICBM RVs in the atmosphere.

Back to the Roadrunner motor. I may have posted this elsewhere on this site but what I do have is this:

"The Super Roadrunner motor developed specifically for the Hypersonic Upgrade Program produced 228,000 pounds of thrust for 1.4 seconds and weighed only 1,100 pounds. The maximum acceleration of the sled was 157-g’s, or 157 times the force exerted by gravity. When the payload impacted the target, it had 363 mega joules of energy – that’s equal to a car impacting a brick wall at 2,020 miles per hour."

If we just pick an arbitrary 100lbs for the case weight that's an ISP of 319 for a solid motor. It may be that it can be that "hot" though because it doesn't have sensitivity requirements.
 

fredymac

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They don't seem to be rushing development of the Maglev Rocket Sled. Probably low on funding priorities. They finally got up to 633mph on a 2000 foot long test track (the steel wheel high speed track in comparison is 50,000 feet long). They are mainly going for a reduction in transient g forces induced when solid wheels roll down a track at extreme speeds.

https://www.youtube.com/watch?v=NSMIOPkNuCQ&feature=youtu.be
 

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