/sci/ - Science & Math

>>15998365
RD-172 (what was planned for Vulkan, and what RD-191 was derived from): 784 tons SL thrust in a 3.56m diameter circle = 78.76t/m2 (base RD-171 = 5% lower), that's between F9 (72t/m2) and Superheavy (99t/m2, considering nozzles stick out slightly from the 9m diameter)

For the time, it was good,

I agree the calculation change when you aim for reuse, but from the soviet's point of view, RD-171 was a clear improvement compared to the NK-15 and NK-33