Jake Blocker
  • Member for 4 years, 11 months
  • Last seen more than a month ago
Can SpaceX Falcon 1st stage hover during landing?
25 votes

The falcon 9 first stage cannot hover as the thrust of one Merlin engine even at its lowest thrust is able to overcome the mass of the almost-empty first stage. The stage appears to decelerate very ...

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How does one dogleg from Florida to a sun-synchronous orbit?
Accepted answer
13 votes

A dogleg maneuver is done to change the inclination of a certain payload, and the reason it limits the payload capacity is most likely due to the cosine losses. In order to perform such a maneuver a ...

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Since the Prob-M Mars Rovers had a motor for locomotion, why not use wheels?
Accepted answer
8 votes

I believe it was because the Soviets at the time did not know the composition of the Martian soil, and how wheels would cope with it. They thought that the soil was too fine for wheels and that they ...

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Pro/cons of burning propellant in stochiometric ratio?
Accepted answer
6 votes

There are several factors as to why an engine would not run the “ideal” stoichiometric ratio of fuels. Here are the two main reasons why rocket engines wouldn’t run the “ideal” ratio. Higher exhaust ...

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How much fuel is needed for the motor landing and taking off on mars?
Accepted answer
5 votes

Assuming that you are talking about a propulsive Landing only, without parachutes, you would need around 3.8 kilometers per second of Delta V (from the map below). It should be noted that the amount ...

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How will the SpaceX ITS return from Mars?
5 votes

It takes 3.8 km/s DV to orbit Mars from the surface, 2.5km/s DV to reach an intercept with Earth, and most likely around 1 km/s to vertically land on Earth as proposed by SpaceX. Altogether the ITS ...

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Merlin 1D Engine
3 votes

The Merlin Engine is a gas generator cycle engine which uses liquid Oxygen(LOX) and refined Kerosene(RP1) as its propellants. The SuperDraco engine is a pressure fed cycle engine which uses mono-...

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SpaceX CRS-11 landing smoke color is weird
3 votes

My best guess is that it's just simply dust. Florida right now is in somewhat of a drought at the moment and this could cause dry dust to settle on the landing pad. After the Static-fire test of CRS-...

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How does Falcon 9 mitigate re-entry pressure?
3 votes

SpaceX has been using supersonic retro-propulsion to slow down the stages enough to not cause significant damage to the engines. This is the same method that will be used to land the Red Dragon probes ...

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Any pressure vessels with more than two fluids?
1 votes

Normally the propellants are stored separately, especially hypergolics, which spontaneously combust upon contact with one another. However SpaceX currently uses Composite Overwrapped Pressure Vessels (...

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