Difference between revisions of "Cheat sheet"

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= Mathematics =
 
= Mathematics =
== Thrust to weight ratio (TWR) ==
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== Thrust to Weight Ratio (TWR) ==
 
{{See also|Terminology#TWR|Terminology}}
 
{{See also|Terminology#TWR|Terminology}}
 
This is Newton's Second Law. If the ratio is less than 1 the craft will not lift off the ground.
 
This is Newton's Second Law. If the ratio is less than 1 the craft will not lift off the ground.
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<math>\text{TWR} = \frac{F}{m \cdot g}</math>
 
<math>\text{TWR} = \frac{F}{m \cdot g}</math>
  
== Combined specific impulse (I<sub>sp</sub>) ==
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== Combined Specific Impulse (I<sub>sp</sub>) ==
 
If the I<sub>sp</sub> is the same for all engines in a stage, then the I<sub>sp</sub> is equal to a single engine. If the I<sub>sp</sub> is different for engines in a single stage, then use the following equation:
 
If the I<sub>sp</sub> is the same for all engines in a stage, then the I<sub>sp</sub> is equal to a single engine. If the I<sub>sp</sub> is different for engines in a single stage, then use the following equation:
  
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== Delta-v (&Delta;v) ==
 
== Delta-v (&Delta;v) ==
===&Delta;v Basic calculation ===
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===&Delta;v Basic Calculation ===
 
{{See also|Tutorial:Advanced Rocket Design}}
 
{{See also|Tutorial:Advanced Rocket Design}}
 
Basic calculation of a rocket's &Delta;v. Use the atmospheric and vacuum thrust values for atmospheric and vacuum &Delta;v, respectively.
 
Basic calculation of a rocket's &Delta;v. Use the atmospheric and vacuum thrust values for atmospheric and vacuum &Delta;v, respectively.

Revision as of 17:54, 3 July 2013

Kerbal Space Program rocket scientist's cheat sheet: Delta-v maps, equations and more for your reference so you can get from here to there and back again.

Mathematics

Thrust to Weight Ratio (TWR)

→ See also: Terminology

This is Newton's Second Law. If the ratio is less than 1 the craft will not lift off the ground.

Combined Specific Impulse (Isp)

If the Isp is the same for all engines in a stage, then the Isp is equal to a single engine. If the Isp is different for engines in a single stage, then use the following equation:

Delta-v (Δv)

Δv Basic Calculation

→ See also: Tutorial:Advanced Rocket Design

Basic calculation of a rocket's Δv. Use the atmospheric and vacuum thrust values for atmospheric and vacuum Δv, respectively.

Transitional (true) Δv of a Stage that Crosses from Atmosphere to Vacuum

Body Δvout
Kerbin 1000 m/s2
other bodies' data missing

Calculation of a rocket stage's Δv, taking into account transitioning from atmosphere to vacuum. Δvout is the amount of Δv required to leave a body's atmosphere, not reach orbit. This equation is useful to figure out the actual Δv of a stage that transitions from atmosphere to vacuum.

Maps

Δv to all bodies in the Kerbol System Various fan-made maps showing the Δv required to travel to a certain body.

Total Δv values

Δv change values

Δv nomogram

Math Examples

TWR

draft

(Isp)

draft

(Δv)

draft

See also

Links to collections of reference material.