Otto, the first of the two ALMA antenna transporters, was given its name at a ceremony on the compounds of heavy-vehicle specialist Scheuerle Fahrzeugfabrik GmbH, in Baden-Württemberg. This new colossus is 10 meters wide, 20 meters long and 6 meters high and will be shipped to Chile by the end of the month.

The transporter was named 'Otto' in honor of Otto Rettenmaier, the owner of the Scheuerle company. "The rather unusual move to name a vehicle is a recognition of the remarkable achievement these unique machines represent," said Hans Rykaczewski, the European ALMA Project Manager. "Their sizes alone would justify using superlatives to describe them. But they are also outstanding as they will operate at 5000 metres altitude, where the air is rare, and they have to be able to place 115-ton antennas with a precision of a few millimetres," he added.



The ALMA Project, in which ESO leads the construction and the operations on behalf of Europe, is a giant, international observatory currently in construction on the high-altitude Chajnantor site in Chile, which will be composed initially of 66 high-precision telescopes, operating at wavelengths of 0.3 to 9.6 mm. The ALMA antennas will be electronically combined and provide astronomical observations which are equivalent to a single large telescope of tremendous size and resolution.

Given their important functions in transporting high-tech antennas with the required care, the transport vehicles must live up to very demanding operational requirements, since the two engines of Otto will lose about half of their power (compared to sea level) because of the reduced oxygen content of the air. With their two 500 kW diesel engines (nearly as much as two Formula 1 engines), the ALMA transporters will be able to move at the speed of 20 km/h when empty and 12 km/h when loaded with an antenna.

Notwithstanding its impressive dimensions, the transporter can be maneuvered by a single operator, the precise positioning being made possible by a hydrostatic system while the electronic 28-wheel drive allows very precise motions.

"When completed in 2012, ALMA will be the largest and most capable imaging array of telescopes in the world," said Massimo Tarenghi, the ALMA Director. "The ALMA antenna transporters, which are unique technological jewels, beautifully illustrate how we are actively progressing towards this goal."

- ESO