Recent comments in /f/technology

Bensemus t1_j7we29w wrote

They need multiple engines for landing. An empty Falcon 9 is already too light to hover or descend on a single Merlin engine at minimum throttle.

Both Starship and SuperHeavy can hover and descend with multiple Raptor engines firing. This gives them engine out capability while landing and a much safer landing profile. There's no need to perform a suicide burn where you only have a brief moment to get it right or you are crashing.

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Bensemus t1_j7wdlho wrote

> If not takeoff and max q, for sure during landing.

They aren't turning any engines off during launch. Max Q doesn't' require a greater than 40% reduce in thrush.

Engines are turned off during separation. Then some are turned back on for the boost back burn and maybe a reentry burn. Then finally some are used for the landing burn.

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coldblade2000 t1_j7w9l0y wrote

>you accepted government funding to research

It'd be nice if you actually pointed to this "research funding". I looked over and all the money SpaceX was given by NASA was "service contracts" which are fulfilled or being fulfilled, or the Commercial Crew Program. In this one, SpaceX didn't receive money in the first round. In the second, seed money was first given to a few companies like BlueOrigin, Boeing and SpaceX to develop technologies for crewed vehicles. In SpaceX's case, their proposal was making their ALREADY EXISTING Dragon capsule human-rated, and finishing its abort system. The Falcon 9 had already flown various resupply missions to the ISS by then. The rest of their funding was NASA paying SpaceX to render services, or specifically making changes to SpaceX's vehicles for NASA's purposes

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