Star Citizen Discussion Thread v11

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StuartGT

StuartGT
[VR] Mr Teatime said:
If there are any flight sim developers on CIG's payroll, then they either need a trout to the face or to hang their heads in shame/bewilderment. How the hell does an atmosphere affect a self contained thruster's efficiency (has to be self contained or it doesn't work in space)?....there is just so much "wrong" in that statement, whoever wrote it should get thrown into a propeller as a lesson.

Thrust vs. Drag and Lift vs. Gravity - these are the forces you're taught about in the first flight school lesson before you even get into an aircraft for the first time and also where you start when you're coding a flight model....if CIG don't know this or the engine doesn't support it, then the results will be "interesting" at best, but probably comical/laughable.

I agree with the the "let's make this a saleable feature angle" - where there's muck, there's brass as they say...
Click to expand...
Good news! Chris Roberts himself is recoding the physics overhaul and refactoring development
Source: https://www.youtube.com/watch?v=fxxlrKlLO9g
 

Tippis

Tippis
[VR] Mr Teatime said:
If there are any flight sim developers on CIG's payroll, then they either need a trout to the face or to hang their heads in shame/bewilderment. How the hell does an atmosphere affect a self contained thruster's efficiency (has to be self contained or it doesn't work in space)?....there is just so much "wrong" in that statement, whoever wrote it should get thrown into a propeller as a lesson.
Click to expand...
Weeeeeell… there are some effects on specific impulse that depend on the pressure difference between the interior and exterior of a combustion chamber, and that will obviously depend on altitude in atmo, up to and including being in a vacuum. It's not a “drastic difference”, however, but a continuum going from a minimum at the surface to a maximum in open space. It sounds more like someone at CI¬G opened up the KSP wiki and started copying ideas… :D

e: Or to just steal the wikipedia entry:
Wikipedia said:
Rocketry
In rocketry, the only reaction mass is the propellant, so an equivalent way of calculating the specific impulse in seconds is used. Specific impulse is defined as the thrust integrated over time per unit weight-on-Earth of the propellant:
{\displaystyle I_{\rm {sp}}={\frac {v_{\text{e}}}{g_{0}}},}

where

{\displaystyle I_{\rm {sp}}}
is the specific impulse measured in seconds,
v_{\text{e}}
is the average exhaust speed along the axis of the engine (in ft/s or m/s),
g_{0}
is the standard gravity (in ft/s2 or m/s2).

In rockets, due to atmospheric effects, the specific impulse varies with altitude, reaching a maximum in a vacuum. This is because the exhaust velocity isn't simply a function of the chamber pressure, but is a function of the difference between the interior and exterior of the combustion chamber. Values are usually given for operation at sea level ("sl") or in a vacuum ("vac").
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Yaffle

Volunteer Moderator
Yaffle
Another 10,000 posts, so it's time for a new thread!

Game Discussions - Star Citizen Discussion Thread v12

Hello all, Our previous SC thread reached the 10,000 post limit. As such, it's time for a new thread for Star Citizen discussions. If you want to discuss Star Citizen, this is the place to do so! As always, the following rules are in effect for this thread (in addition to the per-forum rules...
forums.frontier.co.uk
 
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