Reply to post: No singes.

Jeff Bezos fires off a blue dart, singes Elon Musk and SpaceX

DrMordrid No singes.

BE-4 has burned for exactly 3 seconds at 50% thrust, and several months ago the power head on it (turbopumps etc.) failed, delaying the program.

Raptor has been on the test since September of 2016, accumulating over 1,200 seconds of burn time with many tests running from 40 to 100 seconds - the duration limited due to the size of the test stand's propellant tanks.

Some commenters make a big deal out of the Raptor under test being a "subscale" version, but this is a full flow staged combustion engine, the first modern engine of its type (Russia built one in the 1960's but never flew it.) Growing Raptor the extra 15-20% to get to a full size production engine is easier than it would be for most other engine cycles. This is because the pumps are only pumping gases, not fluids. This makes life easier on the turbopumps, and it also makes the engine more scalable and reusable.

BE-4 is not a full flow staged combustion engine.

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