5 ms·
At least we know Rocket Lab's webcast uses real telemetry, unlike Blue Origin, where they break the laws of Physics by pausing at 0 MPH: https://youtu.be/sUEj4d
by p1mrx 6y ago
At least we know Rocket Lab's webcast uses real telemetry, unlike Blue Origin, where they break the laws of Physics by pausing at 0 MPH: https://youtu.be/sUEj4dxPMbI?t=2658 https://youtu.be/sUEj4dxPMbI?t=2658
- danbr 6y agoNew Shepard is a suborbital rocket. It reaches apogee (velocity drops to zero), and drops back to land propulsively. It’s possible it experiences zero-G for more than just a few milliseconds at its apogee. Hence the 0mph velocity.
- p1mrx 6y agoYou fell victim to one of the classic blunders: conflating velocity with its derivative. The (approximately) zero-G period lasts for minutes, not milliseconds, and during that time, the velocity changes by 9.8 m/s (22 MPH) every second. The velocity should not pause at 0, or any other value.
- dmurray 6y ago22 mph per second is an abomination of a mixed unit I'd never heard before, but it's actually much more intuitive to me than the standard 9.8 metres per second per second. Maybe we can compromise on 35 km/h per second though.
- p1mrx 6y agoI wouldn't normally use MPH/s, but it fits the units in the Blue Origin video.
- mlindner 6y agoNew Shepard is not traveling perfectly vertical, there's always a horizontal component so the velocity will never be zero. Even if you fly up in a perfectly vertical line, you'll gain horizontal velocity as you climb as the Earth's surface moves away from you from it's rotation.
- google234123 6y agoI like how a 1 second pause in telemetry makes you so certain that Blue Origin is fraudulent. Anyway, what is the point of your comment on this thread anyway?
- p1mrx 6y agoI don't think Blue Origin as a whole is fraudulent, just that they're not showing real telemetry data. By way of comparison, I think it's commendable that Rocket Lab's stream was accurate enough for viewers to see the failure occurring live.
- google234123 6y agoFaking the data seems like more work than just showing the data they are getting from the rocket which is why I'm personally skeptical.
- p1mrx 6y agoRe-watching the numbers during the Blue Origin launch, it would've been tedious to fake the jumpiness using a pre-rendered animation, so perhaps the number fudging is limited to a "pause at zero" hack. Still, the presence of a "marketing telemetry" algorithm makes it seem less trustworthy for determining whether a failure occurred.
- reitzensteinm 6y agoIt shows that they're not showing unfiltered telemetry data, but it absolutely does not prove it's not real at all. Interpolation, rounding, sampling frequency in combination would easily explain this. Not to mention that the speed freezes quite frequently at other points in the video...
- SergeAx 6y agoYes, I was impressed by Rocket Lab telemetry too. The picture is freezing and I can see by numbers that vehicle gone ballistic...