Difference between revisions of "Parachute"

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(add info about losing chute during reentry)
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[[File:Mk16-XL Parachute.jpg|thumb|A [[Mk1-2 Command Pod]] hanging on a [[Mk16-XL Parachute]]]]
 
'''Parachutes''' are parts that when deployed slow down the speed of a [[craft]] in an [[atmosphere]] by creating drag. If/when part reuse becomes part of the game, it might become important to attach parachutes to detached booster stages to help try to recover them.
 
'''Parachutes''' are parts that when deployed slow down the speed of a [[craft]] in an [[atmosphere]] by creating drag. If/when part reuse becomes part of the game, it might become important to attach parachutes to detached booster stages to help try to recover them.
  
 
== Usage ==
 
== Usage ==
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[[File:Tweakable.png|thumb|left|The options on a [[Mk16 Parachute]]]]
  
 
Parachutes are used on bodies with atmospheres such as [[Kerbin]] and [[Eve]] to slow the craft for a landing. The deceleration depends on both the mass of the craft and the density of the atmosphere. Therefore crafts that are either very heavy or land on bodies with thin atmospheres ([[Duna]], [[Laythe]]) require either multiple parachutes or additional engines for a soft landing. Parachutes can also be used to aid with [[aerobraking]] to create additional drag. On the other hand, a heavier parachute part generates more drag than a lighter parachute. Parachutes can also be used to help stop space planes as they land.
 
Parachutes are used on bodies with atmospheres such as [[Kerbin]] and [[Eve]] to slow the craft for a landing. The deceleration depends on both the mass of the craft and the density of the atmosphere. Therefore crafts that are either very heavy or land on bodies with thin atmospheres ([[Duna]], [[Laythe]]) require either multiple parachutes or additional engines for a soft landing. Parachutes can also be used to aid with [[aerobraking]] to create additional drag. On the other hand, a heavier parachute part generates more drag than a lighter parachute. Parachutes can also be used to help stop space planes as they land.
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A deployed parachute can also be cut manually (right-click on parachute and executing ''Cut Parachute''). Once cut, they can be repacked by nearby Kerbals on [[EVA]] (right-click on parachute and executing ''Repack Chute''). Repacked Parachutes can be deployed like fresh ones.
 
A deployed parachute can also be cut manually (right-click on parachute and executing ''Cut Parachute''). Once cut, they can be repacked by nearby Kerbals on [[EVA]] (right-click on parachute and executing ''Repack Chute''). Repacked Parachutes can be deployed like fresh ones.
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With the [[tweakable]]s added in {{version|0.23}} the deployment pressures and altitudes can be modified. It is not possible to semi-deploy the parachute sooner.
  
 
== Parts ==
 
== Parts ==

Revision as of 22:06, 1 January 2014

Parachutes are parts that when deployed slow down the speed of a craft in an atmosphere by creating drag. If/when part reuse becomes part of the game, it might become important to attach parachutes to detached booster stages to help try to recover them.

Usage

The options on a Mk16 Parachute

Parachutes are used on bodies with atmospheres such as Kerbin and Eve to slow the craft for a landing. The deceleration depends on both the mass of the craft and the density of the atmosphere. Therefore crafts that are either very heavy or land on bodies with thin atmospheres (Duna, Laythe) require either multiple parachutes or additional engines for a soft landing. Parachutes can also be used to aid with aerobraking to create additional drag. On the other hand, a heavier parachute part generates more drag than a lighter parachute. Parachutes can also be used to help stop space planes as they land.

Parachutes require a minimum air pressure to deploy, so they will work neither in higher parts of atmospheres nor in a vacuum (see Deployment). In addition, parachutes are cut automatically on the ground and so can't be used to, for example, aid in slowing landing aircraft once they are on the runway. The part's mass isn't affected when the parachute is cut. A deployed parachute will cut automatically during descent if propulsion is used to increase vertical speed past zero.

A deployed parachute can also be cut manually (right-click on parachute and executing Cut Parachute). Once cut, they can be repacked by nearby Kerbals on EVA (right-click on parachute and executing Repack Chute). Repacked Parachutes can be deployed like fresh ones.

With the tweakables added in version 0.23 the deployment pressures and altitudes can be modified. It is not possible to semi-deploy the parachute sooner.

Parts

There are currently four options for parachutes.

Image Part Radial size Cost
(Funds)
Mass
(t)
Max. Temp.
(K)
Tolerance
(m/s)
Tolerance
(g)
Semi-Deployed
Diameter
Fully Deployed
Diameter
Semi-Deploy
Pressure
(atm) [Note 1]
Full-Deploy
Altitude
(m AGL) [Note 1]
Mk16 Parachute.png
Mk16 Parachute Tiny 422 0.1 2 500 12 50 0.8 20.7 0.04 1 000
Mk16-XL Parachute.png
Mk16-XL Parachute Small 850 0.3 2 500 12 50 2.5 51.2 0.04 1 000
Mk2-R Parachute.png
Mk2-R Radial-Mount Parachute Radial mounted 400 0.1 2 500 12 50 1.6 41.3 0.04 1 000
Mk25 Parachute.png
Mk25 Parachute Small 400 0.2 2 500 12 50 0.9 6.3 0.02 2 500
Mk12-R Radial-Mount Drogue Chute.png
Mk12-R Radial-Mount Drogue Chute Radial mounted 150 0.075 2 500 12 50 1.3 7.7 0.02 2 500
  1. 1.0 1.1 This setting is tweakable


Deployment

Parachutes deploy at different altitudes on different bodies, depending on the local atmospheric pressure. Rough deployment altitudes are shown below. Note that full deployment depends on height above ground, not pressure. Full-deploy altitudes can be found in the above table.

Semi-Deployment Altitude (m)
Image Part Eve Kerbin Duna Jool Laythe
Mk16 Parachute.png
Mk16 Parachute 44 226 20 004 10 689 126 238 25 146
Mk16-XL Parachute.png
Mk16-XL Parachute 44 226 20 004 10 689 126 238 25 146
Mk2-R Parachute.png
Mk2-R Radial-Mount Parachute 44 226 20 004 10 689 126 238 25 146
Mk25 Parachute.png
Mk25 Parachute 46 315 23 547 14 912 134 228 31 829
Mk12-R Radial-Mount Drogue Chute.png
Mk12-R Radial-Mount Drogue Chute 46 315 23 547 14 912 134 228 31 829