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The tribrid used hybrid startup for a fraction of a second to avoid hard start issues. It started as a hybrid with ABS plastic fuel IIRC, then alcohol flow started. The increased heat melted and blew out the remainder of the ABS and the rest of the burn was liquid. The hybrid mode was just for startup.
Liquid motor starting sequence can be more complex than is the case for solids, or hybrids. Using hybrid startup was a good idea. It provided a softer startup, and at the same time still produced somewhere near full thrust.
Gerald
Liquid motor starting sequence can be more complex than is the case for solids, or hybrids. Using hybrid startup was a good idea. It provided a softer startup, and at the same time still produced somewhere near full thrust.
Gerald