SpaceX’s “grasshopper” rocket on October 7 completed a flight test, reached a record height of 744 meters, which is the “grasshopper” rocket eighth “jump.”
SpaceX will use in the next few years, “Falcon” on the 9th and the “Dragon” type spacecraft combination of tasks to complete the International Space Station will initially conducted several unmanned cargo supply, will follow the “Dragon” type spacecraft to improve, so that it can for manned flight. To control costs, SpaceX company tried to recover “Falcon” on the 9th of the first stage and second stage engine, the first level power station consisting of nine Merlin-1D (M erli n-1D) kerosene and liquid oxygen engine, single thrust can reach 55 tons, recycling engine test falls on the “grasshopper” rocket, 2011 SpaceX’s open right “grasshopper” rocket preliminary work, test and validate reusable, vertical launch, vertical landing (VTVL) technologies.
“Falcon” 9 rocket per launch price of only $ 50 million or so, to achieve low emission rates rocket parts will be reused as much as possible, the shuttle’s solid boosters was the first one of the reusable booster , which requires the use of a parachute to splash sea, then also need to spend some money to fix it.”Grasshopper” rocket test reuse technology landed safely at the predetermined location, not only the first stage can be returned, even second stage rocket can also return to the reentry landing at the predetermined location, it will increase the take-off of the dead weight, to achieve this goal is to have a strong foundation thrust of the engine, the Merlin-1D is clearly capable of this mission.
“Grasshopper” reusable rocket technology is not unusual, “triangular sail fast testing machine” has demonstrated the feasibility of rocket-powered vertical takeoff and landing, the previous technology also can be reused to help stay in the parachute drop, a large envelope cushion landing, etc. Technically, these techniques can achieve reuse booster, but the technical status and there is no “grasshopper” rocket advanced. “Grasshopper” rocket test not only vertical takeoff and landing rocket, but also for SpaceX company has accumulated advanced attitude control technology, in the seventh test flight, “grasshopper” rocket carried a 100 m horizontal flight, the horizontal wind interference remained fairly stable.