Linked Questions

9 votes
2 answers
10k views

Optimal speed per altitude for orbit launch

On Kerbin, rockets have an optimal speed depending on altitude for maximum fuel efficiency, as You can save fuel by being close to your terminal velocity during ascent. Lower velocity wastes delta-...
Antzi's user avatar
  • 12.7k
16 votes
1 answer
1k views

Cause of apparent plume deflection on SES-10?

While watching the SES-10 flight, starting a little after T+1:30, I noticed that the direction of the first-stage exhaust plume started to diverge from the alignment of the rocket body. The ...
Russell Borogove's user avatar
11 votes
4 answers
440 views

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

I simulated an orbital insertion using Powered Explicit Guidance as used in the space shuttle. The PEG algorithm works great. I hit all my targets: altitude, velocity, orbital inclination, longitude ...
user avatar
1 vote
1 answer
4k views

Angle of attack, or displacement angle?

When I hear "angle of attack" or AoA, I think of an airplane. Usually, both the airfoil and the plane itself have a clearly defined 'top' and 'bottom'. In this case, the concept of angle of attack is ...
uhoh's user avatar
  • 149k
5 votes
1 answer
3k views

How to find the optimal launch trajectory for a rocket launched from a planet with an atmosphere?

I originally asked this question on maths stack exchange As the title states I am trying to find the optimal launch trajectory for a rocket launched from a planet with an atmosphere (Earth) in order ...
Glum_Mathematician's user avatar
5 votes
3 answers
902 views

Would a standard gravity turn still be the most optimal path to orbit if Earth did not have an atmosphere?

If Earth had no atmosphere, then would a standard gravity turn still be the most optimal path to orbit? Why or why not?
Mark Smith's user avatar
2 votes
1 answer
405 views

Was the gravity turn used in early spaceflight?

Reading through the Wikipedia article about Gravity Turn, specifically the Use in spaceflight section, it seems that the Gravity Turn was not used in early spaceflight. Is that correct? For example, ...
DarkDust's user avatar
  • 12.5k
2 votes
1 answer
825 views

How does a rocket go from gravity turn to orbit?

A rocket launch normally begins with a roll to align with the orbital plane and a pitch to allow gravity to gradually torque the rocket down as it climbs. The combined roll and pitchover maneuver last ...
user avatar
2 votes
1 answer
378 views

Would a lunar or interstellar rocket use a gravity turn on take-off, today?

Is a gravity turn only used for rockets interested in orbit or a gravitational slingshot? From this answer it sounds like Apollo 11 only used a gravity turn for the crew to maneuver. Are there ...
larry909's user avatar
  • 131
4 votes
0 answers
696 views

Why is a 1.5:1 TWR desirable for a reusable launcher?

According to a Teslerati article linked from another QA: The most critical component for the booster, according to Musk, is that there is “a lot of force pushing up.” He states that to launch ...
Russell Borogove's user avatar
2 votes
1 answer
485 views

Why Celestrak has Archived TLEs for most space stations from Russia and the US, but not Tiangong-1, Tiangong-2 or Skylab?

Thinking about this question, I wanted to look at historical data. Then I noticed that while Celestrak does provide Archived TLE data for Salyut 7, Mir, Kvant-1, Kvant-2, Kristallm, Spektr, Priroda, ...
uhoh's user avatar
  • 149k