Original Item: Only One Available. Now this is a fantastic example of a rocket motor that had various uses it not only the US Military, but used by NASA with a sounding rocket in Suborbital flights to take measurements and perform scientific experiments. This example is in fantastic condition and still retains all original paint and yellow stenciling.

The Loki-Dart was the sounding rocket version of the Loki surface-to-air spin-stabilized missile briefly used as a barrage weapon by the U.S. Army in 1949. The Loki is small, light, but powerful for its size and very inexpensive. It was therefore adapted by the Jet Propulsion Laboratory and State University of Iowa for upper-atmospheric sounding and meteorological work.

Loki-Darts were designed to measure temperature and wind velocity up to a height of 65 kilometers (40 miles). The Loki burned out at a 1,524-meter (5,000 feet) altitude, then dropped off while the Dart inert payload section continued on a ballistic trajectory up to peak altitude and conducted its measurements.

This example measures 66 inches in total length with a 3 inch diameter and retains all original OD Green paint, which is an indicator that this one was produced for use by the Military. Not Available for Export.

A lovely, hard to find rocket motor that comes more than ready for further research and display.

Loki (rocket)
Loki, officially designated 76mm HEAA Rocket T220, was an American unguided anti-aircraft rocket based on the German Taifun. Like the Taifun, Loki never saw service in its original role, but later found widespread use as a sounding rocket. It was so successful in this role that several advanced versions were developed on the basic Loki layout, including the final Super Loki.

As part of their anti-aircraft development program of 1942, the Luftwaffe began developing a number of guided missile projects. However, there was concern that these would not develop in time to be useful in the 1943/44 time frame. To fill the gap, Klaus Scheufelen suggested building a simple unguided rocket that would be fired en-masse directly up into the bomber streams. The result was the Taifun.

Taifun was powered by a hypergolic mixture pressure-fed into the combustion chamber. The pressure was provided by small cordite charges that were fired into the fuel tanks, in the process bursting a pair of thin diaphragms to allow the fuel and oxidizer to flow into the combustion chamber. The Germans were never able to get the engine to work reliably, and the rocket was never deployed operationally.

The US Army had initially studied the Taifun in 1946, and the German engineers now working for the Army were convinced the concept deserved more development. When similar concerns about the development time of their own guided missile projects were raised, the Taifun was reconsidered and a development program started at Bendix in 1948. One major change was to replace the warhead area with a dart-like version, which was separated from the main rocket body at engine burnout to continue on without the drag of the airframe and thereby reach higher altitudes.

Like the Germans before them, Bendix had significant problems with the engine, and eventually decided to develop a solid-fuel engine based on a new elastomeric fuel from the Jet Propulsion Laboratory (JPL), starting in March 1951. The first flight of a solid-fuel Loki occurred on 22 June 1951. The new engine was successful, and the liquid engine was abandoned in February 1952.

An initial meeting on June 25, 1954, at the Redstone Arsenal, of Dr. Wernher von Braun, Frederick C. Durant, Alexander Satin, David Young, Dr. Fred L. Whipple, Dr. S. Fred Singer, and Commander George W. Hoover resulted in an agreement that a Redstone rocket with a Loki cluster as the second stage could launch a satellite into a 200-mile (320 km) orbit without major new developments.

JPL eventually fired 3,544 Lokis at White Sands during the testing program. These tests demonstrated that the launch of one rocket would affect the flight path of the ones behind it, making the dispersion too large to be a useful weapon. Although this problem was studied in depth, it appeared there was no obvious solution. The Army eventually gave up on Loki in September 1955, in favor of the Nike-Ajax missile, which had recently reached operational status, and the MIM-23 Hawk which was expected to be available shortly.

In 1955 the United States Navy took many of the already-completed Lokis and replaced the explosive warhead with a chaff dispenser. These WASP rockets were fired from ships directly upward, and the chaff released at apogee where it was tracked by radar in order to accurately measure the winds aloft. The USAF also used the Loki for this role, assigning it the name XRM-82. The ONR also used the Loki in some of its Rockoon launches, lofting the Loki to high altitudes on a helium balloon before firing.

Many other Lokis were sold into the civilian market, where they became quite popular for meteorological work, referred to as the Loki-Dart. To better serve the needs in this role, a larger-diameter motor with 50% more fuel was developed in 1957, creating the Loki II, the original retroactively becoming Loki I. Other companies developed additional versions, including the Cooper Development /Marquardt Rocksonde 100 with a 100,000 ft maximum altitude and Rocksonde 200 able to reach 200,000 ft.

A variant known as HASP (High Altitude Sounding Projectile) was launched directly from a 5-inch gun barrel. To stabilize the HASP during firing, the dart's small fins were fitted with "bore riders", which guided the rocket along the rifled barrel and thereby also imparted a spin. The bore riders fell free as soon as the dart exited the gun barrel.