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Roblox began to grow rapidly in the second half of the 2010s, and this growth was accelerated by the COVID-19 pandemic. [11] [12] Roblox is free to play, with in-game purchases available through a virtual currency called Robux. As of August 2020, Roblox had over 164 million monthly active users, including more than half of all American children ...
Executor is a rocket engine developed by ARCA [1] for use on its Haas rocket series and on IAR 111 Excelsior supersonic airplane. Executor uses kerosene [2] and liquid oxygen as propellants in a gas-generator power cycle. The injector of Executor is of the pintle type that was first used in the Apollo Program for the lunar module landing engine.