A rocket sled is a test platform that slides along a set of rails, propelled by rockets.
As its name implies, a rocket sled does not use wheels. Instead, it has sliding pads, called "slippers", which are curved around the head of the rails to prevent the sled from flying off the track. The rail cross-section profile is that of a Vignoles rail, commonly used for railroads.
A rocket sled holds the land-based speed record for a vehicle, at Mach 8.5.
A rocket sled is reported to have been used in the closing days of World War II by the Germans to launch a winged A4b strategic rocket from an underground tunnel on March 16, 1945.
Rocket sleds were used extensively by the United States early in the Cold War to accelerate equipment considered too experimental (hazardous) for testing directly in piloted aircraft. The equipment to be tested under high acceleration or high airspeed conditions was installed along with appropriate instrumentation, data recording and telemetry equipment on the sled. The sled was then accelerated according to the experiment's design requirements for data collection along a length of isolated, precisely level and straight test track.
Testing ejection seat systems and technology prior to their use in experimental or operational aircraft was a common application of the rocket sled at Holloman Air Force Base. Perhaps the most famous, the tracks at Edwards Air Force Base were used to test missiles, supersonic ejection seats, aircraft shapes and the effects of acceleration and deceleration on humans. The rocket sled track at Edwards Air Force Base was dismantled and used to extend the track at Holloman Air Force Base, taking it to almost 10 miles in length.
Unmanned rocket sleds continue to be used to test missile components without requiring costly live missile launches. A world speed record of Mach 8.5 (6,416 mph / 10,325 km/h) was achieved by a four-stage rocket sled at Holloman Air Force Base on April 30, 2003.
|Name||Location||Country||Length (ft)||Gauge (in)||Rail Type||Welded/
|Holloman High Speed Test Track (HHSTT) Rails 1&2||Holloman AFB, Alamogordo, NM||USA||50,788||84||171||Welded||1954||Runs North-South,|
|Supersonic Naval Ordnance Research Track (SNORT)||NAWC-WD, China Lake, CA||USA||21,550||56.5||171||Welded||1953||2006||North-South|
|Holloman High Speed Test Track (HHSTT) Rail 3||Holloman AFB, Alamogordo, NM||USA||20,200||26||171||Welded||North-South|
|Extended High-Speed Rocket Sled Track||Edwards AFB, Edwards, CA||USA||20,000||171||Welded||1949||1959||1963||Rails used to lengthen HHSTT|
|Supersonic Military Air Research Track (SMART)||Aircraft Interior Products Propulsion Systems, Hurricane Mesa, UT||USA||12,000||56.5||105||Welded||1955||1961*||*Now Privately Owned & Operational|
|Sandia 2||Kirtland AFB, Albuquerque, NM||USA||10,000||1966||1985||North-South|
|Russia||50 km from Zvezda||Russia||8,202||Segmented|
|B-4||NAWC-WD, China Lake, CA||USA||6,800||56.5||75||Welded||1940|
|Martin-Baker Langford Lodge||Langford Lodge, Northern Ireland||UK||6,200||30||80||1971||Privately Owned & Operated by Martin-Baker|
|Pendine Long Test Track (LTT)||Qinetiq, Pendine, Wales||UK||4,921||12||103|
|Centre D'essais Des Landes Single Rail R1||Biscarrosse, France||France||3,937||Monorail||Square Beam||Segmented||(Foundation for 2nd rail in place)|
|G4||NAWC-WD, China Lake, CA||USA||3,000||33.875||171||Welded|
|Eglin Track||Eglin AFB, Ft. Walton Beach, FL||USA||2,000||56.5||171||Welded|
|Sandia 1||Kirtland AFB, Albuquerque, NM||USA||2,000||1951|
|Edwards North Base Track "G-Whiz"||Edwards AFB, Edwards, CA||USA||2,000||Welded||1944||1953|
|Redstone Technical Test Center Sled Track 1||Redstone Arsenal, AL||USA||1,900|
|Pendine Impact Test Track||Qinetiq, Pendine, Wales||UK||1,476|
|Centre D'essais Des Landes Single Rail R2||Biscarrosse, France||France||1,312||Square Beam|
|Redstone Technical Test Center Sled Track 2||Redstone Arsenal, AL||USA||1,200|
|New Mexico Tech/EMRTC Sled Track||Socorro, NM||USA||1,000||Monorail||171||Privately Owned & Operated|
|Pendine Short Test Track (STT)||Qinetiq, Pendine, Wales||UK||656|
|General Dynamics Ordnance and Tactical Systems||Rock Hill, FL||USA||656||I-Beam||Privately Owned & Operated|
|Holloman Maglev Track||Holloman AFB, Alamogordo, NM||USA|
See also 
- Land speed record for railed vehicles
- Land speed record
- List of vehicle speed records
- Rocket sled launch
|Wikimedia Commons has media related to: Rocket sleds|
- Holloman High Speed Test Track
- Sandia Sled Tracks
- Redstone Technical Test Center Test Area 1
- Langford Lodge Martin Baker Track
- New Mexico Tech EMRTC Sled Track
- Improbable Research
- Airmen "Crash" on Rocket Sled, March 1950, Popular Science large article