Antares rocket’s launching in 1 Hour to space – OA-8 cargo mission NASA

The Antares ATK Orbital rocket will place the commercial supply vessel Cygnus in orbit at the height of 117 miles (189 kilometers) and 184 miles (296 kilometers) within nine minutes of Saturday’s take-off from the east coast of Virginia.

The two rocket RD-181 engines will be detonated approximately 3.6 seconds before take-off from Station 0A at the Mid-Atlantic Regional Spaceport, a complex owned by the state of Virginia at NASA’s Wallops Flight Facility.

The race will begin on Saturday at 7:37 a.m. EST (1237 GMT).

The first two RD-181 first-stage engines will provide up to 864,000 pounds of thrust and burn for 3 minutes, 35 seconds to reach more than 8,950 mph (3.9 kilometers per second) and 61 miles (99 miles per hour). Kilometers). Then, disconnect from the Beaver 30XL top stage engine six seconds later.

The launch, known as OA-8 in the replenishment manifest of the ATK Orbital, will be the second mission of the Antares RD-181 engine that the company has commissioned to NPO Energomash of Russia, AJ26 engines built decades ago in Russia. To replace. By an Antares missile accident seconds after launch in October 2014.

The RD-181 engines performed better than anticipated at an Antares launch in October 2016, which gave engineers the confidence to relax the performance limits for the start of OA-8. The engines generate more thrust than the AJ26 and are programmed to fire six more seconds when the OA-8 is launched than on the last Antares flight.

“We flew to a delta speed threshold,” said Kurt Eberly, director of the Antares program at Orbital ATK, at a press conference earlier this year. “When we did it, we turned off the engines; we had a lot of fuel in the tanks, now we are going to move that threshold a little higher and burn more fuel in the first stage, at that point of the flight regime the acceleration is quite high. Because The scenario is quite light, most of the fuel has disappeared, so you can get some performance by burning a few more seconds in the fuel residues in the tanks.”

With the highest performance, the upgraded Antares can carry approximately 300 pounds more cargo than the planned managers initially. The elimination of additional conservative flight restrictions, along with other minor changes in the vehicle, will increase the carrying capacity of the Antares rocket by an extra 300 pounds in the coming years.

Once the first stage is finished working on the launch of OA-8, the payload shield of the 3.8 meters (3.8 meters) Antares rocket will be halved at T + plus 4 minutes and 11 seconds, An interstage adapter connecting the first and second stage is separated into T + plus 4 minutes, 16 seconds.
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