Delta-V calculator

[TheMacTester]

As far as I know stretching engines only changes the thrust, not the mass or the ISP so the delta-V should not change?

if there is more thrust, but it uses the same amount of fuel, it make more lsp

 

[Dahzito]

if there is more thrust, but it uses the same amount of fuel, it make more lsp

Isn't it the contrary, if there is more thrust over the same amount of fuel there is less Isp? Also, I think that the DeltaV does stay the same indeed, but I will do some tests to see if that's the case.
(May be very wrong tho)

 

[Altaïr]

so for some reason, on my mac, when i stretch engines the delta-v stays the same, why is this, does a mod make this happen, did i do somthing wrong?

This is surprising, this should normally work, the mod was designed to take it into account... Unless you play in challenge mode? The stretch factor is not taken into account in challenge mode.

 

[Darthan]

With twice the thrust the fuel is used twice as fast so the ISP stays the same.

I did a test:

Teleport each of them to 33km LEO and send them to Jupiter direct aiming for a 200km orbit.

Unstretched:
41.5% fuel @ Jupiter SOI
apoapsis @ Jupiter 6454km



Stretched:
43.5% fuel @ Jupiter SOI
apoapsis @ Jupiter 5896km



If the 2x stretched engine used fuel at the same rate it's delta-v should be doubled and it should easily be able to reach Jupiter low orbit. As it was it was only slightly more efficient since it could spend more time closer to the Earth when accellerating so could make more use of the Oberth effect.

 

[TheMacTester]

With twice the thrust the fuel is used twice as fast so the ISP stays the same.

I did a test:
View attachment 130393

Teleport each of them to 33km LEO and send them to Jupiter direct aiming for a 200km orbit.

Unstretched:
41.5% fuel @ Jupiter SOI
apoapsis @ Jupiter 6454km

View attachment 130394 View attachment 130395

Stretched:
43.5% fuel @ Jupiter SOI
apoapsis @ Jupiter 5896km

View attachment 130396 View attachment 130397

If the 2x stretched engine used fuel at the same rate it's delta-v should be doubled and it should easily be able to reach Jupiter low orbit. As it was it was only slightly more efficient since it could spend more time closer to the Earth when accellerating so could make more use of the Oberth effect.

so what is happening? does the mod change engine strech?

 

[Darthan]

so what is happening? does the mod change engine strech?

With twice the thrust the fuel is used twice as fast so the ISP stays the same.

From my test engine stretching does not affect isp. Since I would not expect it to, I doubt that any mod is causing this. You could confirm this by running the test on mobile or teleporting the rockets to a 33km orbit using warpinator, disabling all mods then running the test.

Blueprint of test rockets

 

[Axiom]

if there is more thrust, but it uses the same amount of fuel, it make more lsp

Currently stretching engines increases thrust but also increases fuel consumption so the ISP is left unchanged. In earlier versions (like 1.4) stretching engines didn't increase fuel consumption so you could have a titan engine with 300 TWR and twice the efficiency of an ion engine

 

[Altaïr]

I double-checked, you're correct guys, stretching an engine increases both thrust and fuel consumption, so Isp (and thus ΔV) remains the same. I coded it in ΔV calculator, but I never stretch engines myself...

This is how it is coded:

maxThrust takes the stretch factor into account, and consumption takes it implicitely into account since it's calculated from maxThrust.
But Isp is not influenced by the stretch factor, so it's normal that delta-V remains the same.

A possible scenario where it would make a difference is if you mix engines: for example, if a stage runs with 2 Titan and 2 Frontier. If you stretch the Frontier engines, those will consume more fuel, and in the end, a more important fraction of the fuel available will be consumed by the Frontiers. In this case the ΔV would increase because of stretching. But in the case of a single engine, stretching it won't change ΔV.

 

[TheMacTester]

I double-checked, you're correct guys, stretching an engine increases both thrust and fuel consumption, so Isp (and thus ΔV) remains the same. I coded it in ΔV calculator, but I never stretch engines myself...

This is how it is coded:
View attachment 130425
maxThrust takes the stretch factor into account, and consumption takes it implicitely into account since it's calculated from maxThrust.
But Isp is not influenced by the stretch factor, so it's normal that delta-V remains the same.

A possible scenario where it would make a difference is if you mix engines: for example, if a stage runs with 2 Titan and 2 Frontier. If you stretch the Frontier engines, those will consume more fuel, and in the end, a more important fraction of the fuel available will be consumed by the Frontiers. In this case the ΔV would increase because of stretching. But in the case of a single engine, stretching it won't change ΔV.

I didnt know this, i was hoping to make a weak engine for my alternate universe (releasing soon!)

 

[QMSP]

Is it possible to see the delta v readout in the build screen?

 

[Altaïr]

Is it possible to see the delta v readout in the build screen?

No, it's only available in the world scene.

 

[roshan]

Do i have permission to add this to SFS Mod Installer

 

[Altaïr]

Do i have permission to add this to SFS Mod Installer

Sure. You can add all my mods if you wish.

 

[Heitor Montoni]

Will you make a mobile supported version for this mod and for ANAIS? I like both of them very much, and i would appreciate if you made a version mobile supported. Also, i'm not rushing you, just take your time on it.

 

[roshan]

Will you make a mobile supported version for this mod and for ANAIS? I like both of them very much, and i would appreciate if you made a version mobile supported. Also, i'm not rushing you, just take your time on it.

for ANAIS and this it wont happen cuz custom code execution cant happen on mobile sorry

 

[Heitor Montoni]

for ANAIS and this it wont happen cuz custom code execution cant happen on mobile sorry

Damn. It's ok, i understand it.

 

[AllanMedina]

para ANAIS y esto no sucederá porque la ejecución de código personalizado no puede suceder en el móvil, lo siento

¡Rayos! Está bien, lo entiendo.

Aquí hay un mod simple, pero muy útil, la calculadora ΔV.

Este mod agrega tu estadística ΔV a tu panel de información de vuelo:
View attachment 110471

¿Cómo funciona?

Simplemente calcula el ΔV disponible para tu cohete en todos los motores actualmente encendidos. Básicamente, muestra cuánto ΔV obtendrías si dejaras que el cohete consumiera su combustible sin tocar nada más. Esto significa que, por ejemplo, tu ΔV cambiará si enciendes otro motor o si activas un separador (ya que esto alivia el peso del cohete).
Es compatible con muchas situaciones:

• puede manejar múltiples etapas trabajando juntas (normalmente una primera etapa flanqueada por propulsores), también tiene en cuenta el hecho de que algunas etapas pueden quedarse sin combustible antes que otras.
• Funciona con precisión con motores en ángulo.
• Compatible con potenciadores (si tienes un paquete de piezas personalizado para agregarlos)
• funciona con motores iónicos
• funciona con motores estirados

Limitaciones conocidas:

• no tiene en cuenta RCS (generalmente no se agregan para ΔV...)

Espera, ¿qué es "ΔV" para empezar?

"ΔV" se pronuncia "delta-V". "Δ" es una letra griega comúnmente usada en física para expresar una diferencia. En este caso, significa "diferencia de velocidad". Se trata de un recurso abstracto sobre cohetes que indica cuánto se puede variar la velocidad del cohete.

Por ejemplo, si tu cohete corre a 1000 m/sy acelera hasta alcanzar 1100 m/s, entonces ha gastado 100 m/s de ΔV.

¿Cómo lo instalo?

1. Abre tu carpeta de mods (desde el juego, ve al menú del cargador de mods y haz clic en "Abrir carpeta de mods")
2. Descargar DeltaV_Calculator.dll
3. Colócalo en tu carpeta de mods.
4. Reinicia tu juego y activa el mod (asegúrate de que las herramientas de UI estén activadas, de lo contrario el mod no aparecerá)

Así es como se ve el mod en el menú del cargador de mods:
View attachment 110472

Disfrutar:Frío:

Nota : este mod es compatible con Vanilla Upgrade (también agrega datos adicionales al panel de información de vuelo)

Código fuente disponible aquí .

¿Se puede para Android? Ahora se le puede meter mods al sfs en Android pero parece que no funciona.

 

[Altaïr]

Will you make a mobile supported version for this mod and for ANAIS? I like both of them very much, and i would appreciate if you made a version mobile supported. Also, i'm not rushing you, just take your time on it.

Exactly what said roshan. It's just not possible right now, but I would certainly do it otherwise.