New answers tagged

2 votes

Orbit design guidelines for rendezvous with ISS?

Are there any constraints I can use to properly choose the values for these parameters? Two key constraints are the approach ellipsoid and the keep-out sphere. Most vehicles have additional ...
user avatar
  • 64.2k
3 votes

Has a rocket from a torpedo tube ever reached space?

Certainly not to Orbit The smallest rocket to deliver a payload to orbit is a Japanese sounding rocket that is 9.7 meters tall. The US heavy-weight torpedo (Mk. 48 ADCAP) is 5.8m and the Russia heavy-...
user avatar
4 votes

Powered Explicit Guidance: Should rocket be pitching down at orbital insertion?

This is a result of having low TWR on the orbital insertion stage, typically a characteristic of hydrolox. If you watch ULA streams, you'll see the DCSS & Centaur both do this as well. Basically, ...
user avatar
  • 9,928
0 votes

Powered Explicit Guidance: Should rocket be pitching down at orbital insertion?

Think about just the vertical motion. The vehicle has a lot of upward velocity. What reduces that to the small or zero amount needed for orbit? You could wait for gravity to do it, but at 10m/s^2 that’...
user avatar
  • 12.3k
4 votes

Horizontal vs Vertical Takeoff

They aren't doing the same thing. All the vehicles mentioned are staged rockets. In the case of the X-37, the first stage is an Atlas 5 rocket. The others are dropped at altitude from a carrier ...
user avatar
  • 1,593

Top 50 recent answers are included