Kerosine/LOX burns very bright, compared to the Methane/LOX tests you may have seen in other tests, which produce almost invisible exhaust and have bright shock diamonds. Unfortunately the cameras were calibrated for the less-bright tests they usually do on this test stand, so the footage is overexposed. We tried to stop down the cameras, for the long duration run, but it was still too bright. So no pretty shock diamonds in the footage. Exhaust is supersonic after engine throat, reaching around 2300m/s at nozzle exit.
If your blowtorch produces 5kN, all the power to you. Even small rocket engines are surprisingly strong.
Lin (co-founder of LEAP 71 — and "I was there, when we heard the rocket rumble through 3m of concrete bunker walls")
Yeah, no pretty looking shock diamonds in that exhaust. Which makes me thing the exhaust velocity is pretty low, which I'm not too surprised by since the throat of that engine looks pretty large. And the specific impulse (efficiency) of a rocket engine is directly tied to the effective exhaust velocity [0].
Still amazingly cool, but to the other questions on this thread I'm sure the performance is not comparable to an existing rocket engine design.
Comments
It's really cool, but the flame profile is that of a blowtorch, not a rocket engine
Kerosine/LOX burns very bright, compared to the Methane/LOX tests you may have seen in other tests, which produce almost invisible exhaust and have bright shock diamonds. Unfortunately the cameras were calibrated for the less-bright tests they usually do on this test stand, so the footage is overexposed. We tried to stop down the cameras, for the long duration run, but it was still too bright. So no pretty shock diamonds in the footage. Exhaust is supersonic after engine throat, reaching around 2300m/s at nozzle exit.
If your blowtorch produces 5kN, all the power to you. Even small rocket engines are surprisingly strong.
Lin (co-founder of LEAP 71 — and "I was there, when we heard the rocket rumble through 3m of concrete bunker walls")
Yeah, no pretty looking shock diamonds in that exhaust. Which makes me thing the exhaust velocity is pretty low, which I'm not too surprised by since the throat of that engine looks pretty large. And the specific impulse (efficiency) of a rocket engine is directly tied to the effective exhaust velocity [0].
Still amazingly cool, but to the other questions on this thread I'm sure the performance is not comparable to an existing rocket engine design.
[0] https://en.wikipedia.org/wiki/Specific_impulse#Specific_impu...