Rocket car

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Opel RAK.2 rocket car OpelRAK2.JPG
Opel RAK.2 rocket car

A rocket car is a land vehicle propelled by a rocket engine. A rocket dragster is a rocket car used for competing in drag racing, and this type holds the unofficial world record for the 1/4 mile.

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Opel RAK.1 - World's first public flight of a manned rocket-powered plane on September 30, 1929 Opel RAK1 2.jpg
Opel RAK.1 - World's first public flight of a manned rocket-powered plane on September 30, 1929

Fritz von Opel was instrumental in popularizing rockets as means of propulsion for vehicles. In the 1920s, he initiated together with Max Valier, co-founder of the "Verein für Raumschiffahrt", the world's first rocket program, Opel-RAK, leading to speed records for automobiles, rail vehicles and the first manned rocket-powered flight in September of 1929. [1] Months earlier in 1928, one of his rocket-powered prototypes, the Opel RAK2, reached piloted by von Opel himself at the AVUS speedway in Berlin a record speed of 238 km/h, watched by 3000 spectators and world media, among them Fritz Lang, director of Metropolis and Woman in the Moon , world boxing champion Max Schmeling and many more sports and show business celebrities. A world record for rail vehicles was reached with RAK3 and a top speed of 256 km/h. [2] After these successes, von Opel piloted the world's first public rocket-powered flight using Opel RAK.1, a rocket plane designed by Julius Hatry. World media reported on these efforts, including UNIVERSAL Newsreel of the US, causing as "Raketen-Rummel" or "Rocket Rumble" immense global public excitement, and in particular in Germany, where inter alia Wernher von Braun was highly influenced. [3] The Great Depression led to an end of the Opel-RAK program, but Max Valier continued the efforts. After switching from solid-fuel to liquid-fuel rockets, he died while testing and is considered the first fatality of the dawning space age.

Rocket cars are capable of very high speeds, and at one time held the land speed record (now held by a jet car). Rocket cars differ from jet-powered cars in that they carry both fuel and oxidizer on board, eliminating the need for an air inlet and compressor which add weight and increase drag. Rocket cars run their engines for relatively short periods of time, usually less than 20 seconds, but the acceleration levels that rocket cars can reach due to their high thrust-to-weight ratio are very high and high speeds are fairly easily achieved.

Sammy Miller in 1984 at Santa Pod Raceway recorded the quickest quarter mile elapsed time ever of 3.58 seconds at 386.26 mph using a hydrogen peroxide powered engine car called Vanishing Point. The record was witnessed by 10,000 spectators and officials in attendance. This is in excess of the performance of more familiar piston-engined dragsters. [4]

A different type of rocket propulsion uses hybrid rockets with nitrous oxide as the oxidant such as the British rocket dragster, 'Laffin-Gas'. [5]

In America, rocket dragsters fell into disuse after their hydrogen peroxide propellant became too expensive and they are banned in most events for safety reasons, mostly due to their very high performance. However, they continue to run at several European venues.

Tesla Motors plans to produce a rocket-power-assisted production road car, as an option package. The "SpaceX" option package for the 2020s Tesla Roadster was announced in 2018. This optioned-up Roadster package would add cold gas thrusters powered by compressed air to improve performance. [6] [7] [8]

History

Notable rocket cars

Opel Rak.6 rocket car Bundesarchiv Bild 102-01338, Max Valier im Raketenauto.jpg
Opel Rak.6 rocket car

See also

Related Research Articles

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This article gives a concise timeline of rocket and missile technology.

<span class="mw-page-title-main">Rocket engine</span> Non-air breathing jet engine used to propel a missile or vehicle

A rocket engine uses stored rocket propellants as the reaction mass for forming a high-speed propulsive jet of fluid, usually high-temperature gas. Rocket engines are reaction engines, producing thrust by ejecting mass rearward, in accordance with Newton's third law. Most rocket engines use the combustion of reactive chemicals to supply the necessary energy, but non-combusting forms such as cold gas thrusters and nuclear thermal rockets also exist. Vehicles propelled by rocket engines are commonly called rockets. Rocket vehicles carry their own oxidiser, unlike most combustion engines, so rocket engines can be used in a vacuum to propel spacecraft and ballistic missiles.

<span class="mw-page-title-main">AC Propulsion tzero</span> Motor vehicle

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<span class="mw-page-title-main">Lippisch Ente</span> Type of aircraft

The Ente was the world's first full-sized rocket-powered aircraft. It was designed by Alexander Lippisch as a sailplane and first flown under power on June 11, 1928, piloted by Fritz Stamer as part of the Opel-RAK rocket program led by Fritz von Opel and Max Valier.

<span class="mw-page-title-main">Opel RAK.1</span>

The Opel RAK.1 was the world's first purpose-built rocket-powered aircraft. It was designed and built by Julius Hatry under commission from Fritz von Opel, who flew it on September 30, 1929 in front of a large crowd at Rebstock airport near Frankfurt am Main. The RAK.1 plane was part of a series of rocket-powered vehicles that were developed and demonstrated within the Opel RAK program, the world's first large-scale rocket program.

<span class="mw-page-title-main">Fritz von Opel</span>

Fritz Adam Hermann von Opel was a German rocket technology pioneer and automotive executive, nicknamed "Rocket-Fritz". He is remembered mostly for his spectacular demonstrations of rocket propulsion that earned him an important place in the history of aviation and spaceflight as head of the world's first large-scale rocket program, Opel-RAK. Fritz von Opel, known as Fritz Adam Hermann Opel until his father was ennobled in 1917, was the only son of Wilhelm von Opel and a grandson of Adam Opel, founder of the Opel company.

<span class="mw-page-title-main">Julius Hatry</span> German aircraft designer and builder

Julius Hatry was a German aircraft designer and builder. He is remembered for his contributions to sailplane development in the early twentieth century and for building the world's first purpose-built rocket plane, the Opel RAK.1.

<span class="mw-page-title-main">Friedrich Wilhelm Sander</span>

Friedrich Wilhelm Sander was a German pyrotechnics and rocket technology engineer as well as manufacturer remembered for his contributions to rocket-powered flight as key protagonist of the Opel-RAK program.

<span class="mw-page-title-main">Max Valier</span> Austrian rocketry pioneer

Max Valier was an Austrian rocketry pioneer. He was a leading figure in the world's first large-scale rocket program, Opel-RAK, and helped found the German Verein für Raumschiffahrt that would bring together many of the minds that would later make spaceflight a reality in the 20th century.

The Verein für Raumschiffahrt was a German amateur rocket association prior to World War II that included members outside Germany. The first successful VfR test firing with liquid fuel was conducted by Max Valier at the Heylandt Works on January 25, 1930; and additional rocket experiments were conducted at a farm near Bernstadt, Saxony.

<span class="mw-page-title-main">Liquid-propellant rocket</span> Rocket engine that uses liquid fuels and oxidizers

A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses liquid propellants. Gaseous propellants may also be used but are not common because of their low density and difficulty with common pumping methods. Liquids are desirable because they have a reasonably high density and high specific impulse (Isp). This allows the volume of the propellant tanks to be relatively low. The rocket propellants are usually pumped into the combustion chamber with a lightweight centrifugal turbopump, although some aerospace companies have found ways to use electric pumps with batteries, allowing the propellants to be kept under low pressure. This permits the use of low-mass propellant tanks that do not need to resist the high pressures needed to store significant amounts of gasses, resulting in a low mass ratio for the rocket.

<span class="mw-page-title-main">Rocket-powered aircraft</span> Aircraft which uses a rocket engine for propulsion

A rocket-powered aircraft or rocket plane is an aircraft that uses a rocket engine for propulsion, sometimes in addition to airbreathing jet engines. Rocket planes can achieve much higher speeds than similarly sized jet aircraft, but typically for at most a few minutes of powered operation, followed by a gliding flight. Unhindered by the need for oxygen from the atmosphere, they are suitable for very high-altitude flight. They are also capable of delivering much higher acceleration and shorter takeoffs. Many rocket aircraft may be drop launched from transport planes, as take-off from ground may leave them with insufficient time to reach high altitudes.

High-test peroxide (HTP) is a highly concentrated solution of hydrogen peroxide, with the remainder consisting predominantly of water. In contact with a catalyst, it decomposes into a high-temperature mixture of steam and oxygen, with no remaining liquid water. It was used as a propellant of HTP rockets and torpedoes, and has been used for high-performance vernier engines.

The highest specific impulse chemical rockets use liquid propellants. They can consist of a single chemical or a mix of two chemicals, called bipropellants. Bipropellants can further be divided into two categories; hypergolic propellants, which ignite when the fuel and oxidizer make contact, and non-hypergolic propellants which require an ignition source.

<span class="mw-page-title-main">Tesla Roadster (first generation)</span> Electric convertible sports car produced 2008–2012

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A cold gas thruster is a type of rocket engine which uses the expansion of a pressurized gas to generate thrust. As opposed to traditional rocket engines, a cold gas thruster does not house any combustion and therefore has lower thrust and efficiency compared to conventional monopropellant and bipropellant rocket engines. Cold gas thrusters have been referred to as the "simplest manifestation of a rocket engine" because their design consists only of a fuel tank, a regulating valve, a propelling nozzle, and the little required plumbing. They are the cheapest, simplest, and most reliable propulsion systems available for orbital maintenance, maneuvering and attitude control.

<span class="mw-page-title-main">Opel-RAK</span>

Opel-RAK were a series of rocket vehicles produced by German automobile manufacturer Fritz von Opel, of the Opel car company, in association with others, including Max Valier, Julius Hatry, and Friedrich Wilhelm Sander. Opel RAK is generally considered the world's first large-scale rocket program, significantly advancing rocket and aviation technology as well as instrumental in popularizing rockets as means of propulsion. In addition Opel RAK demonstrations were also highly successful as publicity stunts for the Opel car company. The Lippisch Ente, the world's first rocket-powered glider and piloted for its first flight on June 11, 1928, by Fritz Stamer at Wasserkuppe, was bought and operated by Opel in context of the Opel RAK program but is not formally designated an Opel RAK series number. Also a rocket-powered RAK-Motoclub motorbike, based on a conventional Opel Motoclub 500 SS and presented at the Berlin Motorshow 1928, did not receive a formal RAK number.

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<span class="mw-page-title-main">Tesla Roadster (second generation)</span> Sports car from Tesla, Inc.

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<span class="mw-page-title-main">Elon Musk's Tesla Roadster</span> Sports car launched into space in 2018

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References

  1. https://www.airforcemag.com/article/0904rocket/ article by Walter J. Boyne in Air Force Magazine, September 1, 2004
  2. "Opel Sounds in the Era of Rockets". 23 May 2018.
  3. https://www.airspacemag.com/daily-planet/century-elon-musk-there-was-fritz-von-opel-180977634/ article by Frank H. Winter in Air&Space, April 30, 2021
  4. "Drag Racing Story of the Day - The Rocketman Checks In: Ky Michaelson Lists All his Rocket Dragsters". Draglist.com. Retrieved 2011-08-06.
  5. "The Laffin Gas Project". Laffin-gas.com. Archived from the original on 2011-07-13. Retrieved 2011-08-06.
  6. Fred Lambert (10 June 2018). "Elon Musk is serious about adding thrusters to the new Tesla Roadster, the option will replace the back seats". electrek.
  7. DAVID Z. MORRIS (10 June 2018). "Elon Musk Says Tesla's Next Roadster Will Feature Actual SpaceX Rocket Thrusters". Fortune Magazine.
  8. ANDREW KROK (11 June 2018). "Elon Musk is 100 percent serious about Roadster thrusters". Roadshow. CNET.