Difference between revisions of "Template talk:Stats Table Jet Engines"

Latest revision as of 15:13, 28 May 2015

I've seen also what is written in the game, but they are "fake" values - the thrust drops to 0 at that speed values in contradistinction with the given values... NWM (talk) 02:40, 28 May 2015 (UTC)

The thrust of jet engines is defined in a way that makes it difficult to display in the stats table. The thrust at a given velocity and altitude is derived from two pre-defined curves in the .cfg files (specific impulse is constant regardless of thrust, unlike rocket engines). The turbojet, for example, has a maximum thrust of 1044 kN, but that's only achieved when traveling at exactly Mach 3 and exactly at sea level, which is a rare scenario in practice. A more complete way to define the thrust than what I put in the table is to list the thrust while stationary at sea level, the optimal velocity, the thrust at that velocity, and the maximum velocity. I couldn't figure out a nice-looking way to display that in the table, but if someone else wants to try, here's the values:

Engine	ASL stationary thrust	optimal velocity	thrust at optimal velocity	maximum velocity
Basic jet engine	115	Mach 1.67	1.46x	Mach 2.5
Turbojet engine	180	Mach 3	4.9x	Mach 5.5
Rapier engine	140	Mach 3.7	8.5	Mach 6

The rapier engine will probably switch to rocket mode well before it hits Mach 6

VariousMetals (talk) 12:30, 28 May 2015 (UTC)

I see you already incorporated the new data into the table. The only “missing” part is the maximum velocity. — xZise [talk] 14:28, 28 May 2015 (UTC)

Maybe, the altitude should be involved in the table somehow, as that "1044 kN" is unreachable. Although the jet engine model seems somewhat unrealistic, as the Isp is constant by the speed instead of decreasing exponentially...- NWM (talk) 15:02, 28 May 2015 (UTC)

Right, but the information I put there is misleading because thrust scales with both velocity and altitude, and the figures I used only apply to thrust at sea level. Also, the table I had above is still somewhat incomplete, because I didn't include any information on the effect of atmospheric pressure. VariousMetals (talk) 15:13, 28 May 2015 (UTC)