Difference between revisions of "Parachute Hatch"

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{{itembox
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{{SimpleItembox|Mod:Vanilla/CubeBlock/LgParachute
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| item = Parachute Hatch
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|Size|Mass|Integrity|BuildTimeSeconds|MaterialDeployCost|PowerConsumptionMoving#W|PowerConsumptionIdle#W|ResourceSinkGroup|IsAirTight|PCU
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| description =
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}}{{SimpleItembox|Mod:Vanilla/CubeBlock/SmParachute
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| tool = no
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|Size|Mass|Integrity|BuildTimeSeconds|MaterialDeployCost|PowerConsumptionMoving#W|PowerConsumptionIdle#W|ResourceSinkGroup|IsAirTight|PCU
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| largeship = yes
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}}{{CategorizeComponents|Mod:Vanilla/CubeBlock/LgParachute}}
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| smallship = yes
 
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| component = no
 
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| rawmaterial = no
 
−
| material = no
 
  
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| sresourcesinkgroup = Doors
 
−
| spowerconsumption = 0.001
 
−
| spowerstandby = 0.00001
 
−
| sbuildtime = 24
 
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| sdisassembleratio = 1.5
 
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| sairtightness = yes
 
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| sheight = 1
 
−
| swidth = 1
 
−
| sdepth = 1
 
  
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| scomponentstructure = 2
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==Overview==
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| scomponent1 = Steel Plate
+
The '''Parachute Hatch''' is a re-loadable parachute deployment block. It consumes [[Canvas]] materials with each deployment (1 for small grid, 5 for large grid), but is otherwise reusable. It allows players to rapidly slow their craft in-atmosphere (regardless of which direction they are moving in) and/or gently lower their craft to the ground. Thus, players can deliver craft or items from orbit to ground without requiring expensive [[thruster]]s on the craft to prevent a crash. It can also be used as a backup landing mechanism in case too many lift thrusters are damaged or destroyed. The block itself is based on the Ship Parachutes mod which was developed by Harax, Mexpex and Draygo.
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| scomponent1amt = 1
 
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| scomponent2 = Computer
 
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| scomponent2amt = 1
 
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| scomponent3 = Motor
 
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| scomponent3amt = 1
 
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| scomponent4 = Small Steel Tube
 
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| scomponent4amt = 1
 
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| scomponent5 = Construction Component
 
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| scomponent5amt = 2
 
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| scomponent6 = Steel Plate
 
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| scomponent6amt = 1
 
  
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| lresourcesinkgroup = Doors
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==Usage==
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| lpowerconsumption = 0.001
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To use, place 1 or more parachute hatches on your craft and stock them with canvas. It is recommended to keep parachutes aligned with your center-of-mass, since once the parachute is opened your craft will hang from it at whatever point it is attached. The parachute can be deployed manually by "Opening" the hatch, or automatically at a specified altitude. The hatch will "Close" and the parachute will be automatically detached (and cease to exist) when the craft comes to a complete stop either on the ground or in a hover (if the craft has sufficient downwards thrust and dampeners enabled). The hatch can also be manually closed at any time, discarding the parachute.
−
| lpowerstandby = 0.00001
 
−
| lbuildtime = 24
 
−
| ldisassembleratio = 1.5
 
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| lairtightness = yes
 
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| lheight = 1
 
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| lwidth = 1
 
−
| ldepth = 1
 
  
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| lcomponentstructure = 2
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===Control Panel===
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| lcomponent1 = Steel Plate
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{| class="wikitable"
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| lcomponent1amt = 4
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!Open / Closed
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| lcomponent2 = Computer
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|style="padding-left: 5px;"|Deploys ("Open") or detaches ("Closed") the parachute.
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| lcomponent2amt = 2
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|-
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| lcomponent3 = Motor
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!Auto deploy
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| lcomponent3amt = 3
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|style="padding-left: 5px;"|Whether auto deploy is on or off
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| lcomponent4 = Small Steel Tube
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|-
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| lcomponent4amt = 5
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!Auto deploy height
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| lcomponent5 = Construction Component
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|style="padding-left: 5px;"|Height that the parachute will automatically deploy if auto deploy is On<br>'''Min:''' 10m&emsp;&emsp;'''Max:''' 10,000m
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| lcomponent5amt = 25
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|}
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| lcomponent6 = Steel Plate
 
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| lcomponent6amt = 5
 
  
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| version = 1.183.0
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===Terminal Velocity===
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}}
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When deployed, parachutes quickly slow the craft to a fraction of its original speed, however they do not immediately slow the craft to its [https://en.wikipedia.org/wiki/Terminal_velocity terminal velocity]. After the rapid deceleration immediately following deployment, the craft will gradually slow to its terminal velocity.
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{{Template:Stub}}
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−
The '''Parachute Hatch''' is a re-loadable parachute deployment block. It consumes [[Canvas]] materials with each deployment (1 for small grid, 5 for large grid), but is otherwise reusable. They are ineffective in less than 20% atmosphere.
+
It is possible to calculate a craft's terminal velocity, in order to gauge how soft or hard the landing will be:
 +
<!-- div margin is necessary to prevent it extending behind itembox -->
 +
<div style="margin-right:370px">
 +
<!-- Begin Code Block - IMPORTANT: Each line here MUST start with a space, except headings -->
 +
'''Ship-specific variables'''
 +
'''MASS''' - in kg
 +
'''GRIDSIZE''' - 0.5 for small grid parachute, 2.5 for large grid parachute
 +
'''QTY''' - number of parachutes
 +
'''Planet-specific variables'''
 +
'''GRAVITY''' - in m/s2 (9.81 for Earth-like planets)
 +
'''ATM''' - atmosphere, changes with altitude (from 0 to 1.0 on Earth-like planets)
 +
'''Constants'''
 +
'''RADMULT''' - radius multiplier, always = 8
 +
'''REEFLEVEL''' - reefing level, always = 0.6
 +
'''CD''' - drag coefficient, always = 1.0
 +
'''Calculations'''
 +
parachute diameter = (log((10*(ATM-REEFLEVEL))-0.99)+5)*RADMULT*GRIDSIZE
 +
 +
area = PI*(diameter/2)^2
 +
 +
terminal velocity = squareroot((MASS*GRAVITY)/(area*CD*QTY*ATM*1.225*2.5))
 +
 +
'''Example: Standard Red Ship'''
 +
MASS = 2927310
 +
GRIDSIZE = 2.5 ''(large grid)''
 +
QTY = 10 ''(it's a big ship!)''
 +
GRAVITY = 9.81 ''(we'll say this is an Earth-like planet)''
 +
ATM = 0.85 ''(avoid using 1.0 - 0.85 gives a more conservative result)''
 +
 +
diameter = (log((10*(ATM-REEFLEVEL))-0.99)+5)*RADMULT*GRIDSIZE
 +
          = (log((10*(0.85-0.6))-0.99)+5)*8*2.5
 +
          = 103.6
 +
 +
area = PI*(diameter/2)^2
 +
      = 8,429.6
 +
 +
terminal velocity = squareroot((MASS*GRAVITY)/(area*CD*QTY*ATM*1.225*2.5))
 +
                  = squareroot((2927310*9.81)/(8429.6*1.0*10*0.85*1.225*2.5))
 +
                  = 11.4 m/s
 +
<!-- End Code Block -->
 +
</div>
 +
 
 +
==Media==
 +
<gallery mode="nolines" widths="560px" heights="315px">
 +
File:Parachute01.png|Two parachutes of different colors, deployed.
 +
File:Parachute02.png|View of parachutes from below.
 +
File:Parachute_Hatch_Blocks.jpg|Large grid and small grid parachute hatch blocks.
 +
</gallery>
 +
{{#ev:youtube| _XvDL5zrReQ |560}}
 +
 
 +
==Tips==
 +
* Parachutes and mountains do not get along. Where possible, try to use a parachute over low-elevation terrain.
 +
* Large grid parachutes have 25x more drag than a small grid parachute. Use large grid parachutes for heavy drops.
 +
* Parachute drag will oppose your direction of motion in atmosphere, even if you are trying to fly UP.
 +
* You need electrical power on a grid to deploy or cut the chutes, but while the chutes are deployed power is not strictly necessary. The parachute will stay out while the power is gone, and will even stay out if the block is damaged to a non-functional state!
 +
* On a ship with low weight and many parachutes, parachutes might automatically cut when the ship velocity drops below 2 m/s. If you start falling because of this then the chutes will re-deploy if set for automatic deployment. In Survival Mode this would cause you to expend more canvas. If this happened repeatedly, you could run out of canvas before reaching the ground.
 +
 
 +
==Known Issues==
 +
 
 +
==Programming==
 +
 
 +
==Update History==
 +
{| class="wikitable"
 +
|-
 +
| style="text-align: center;width:10%;"| [[Update 1.183.1]] ||style="padding-left: 10px;padding-right: 10px;"|
 +
*Fixed parachute not working with conveyor system
 +
|-
 +
| style="text-align: center;width:10%;"| [[Update 1.183.0]] ||style="padding-left: 10px;padding-right: 10px;"|
 +
*Parachute Hatch introduced
 +
|}
 +
[[Category:Functional Blocks]]

Latest revision as of 22:52, 19 May 2020

Parachute Hatch Icon.png
Large Ship / Station
Parachute Hatch
Large Ship Icon.png
ComponentsRequired
 Functional 
 Hack 
Dimensions (W,H,L)1,1,1
Mass472.4 kg
472,400 g
472,400,000 mg
0.472 t
Integrity1,847
Build time22 s
Deploy Canvas Cost5
Moving Power Consumption1,000 W
1.0e-3 MW
1 kW
Idle Power Consumption10 W
1.0e-5 MW
0.01 kW
Power Consumer GroupDoors
Is AirtightYes
PCU Cost50
BrowseLast edit: 2020-04-15
Parachute Hatch Icon.png
Small Ship
Parachute Hatch
Small Ship Icon.png
ComponentsRequired
 Functional 
 Hack 
Dimensions (W,H,L)1,1,1
Mass84.2 kg
84,200 g
84,200,000 mg
0.0842 t
Integrity316
Build time10 s
Deploy Canvas Cost1
Moving Power Consumption1,000 W
1.0e-3 MW
1 kW
Idle Power Consumption10 W
1.0e-5 MW
0.01 kW
Power Consumer GroupDoors
Is AirtightYes
PCU Cost50
BrowseLast edit: 2020-04-15


Overview

The Parachute Hatch is a re-loadable parachute deployment block. It consumes Canvas materials with each deployment (1 for small grid, 5 for large grid), but is otherwise reusable. It allows players to rapidly slow their craft in-atmosphere (regardless of which direction they are moving in) and/or gently lower their craft to the ground. Thus, players can deliver craft or items from orbit to ground without requiring expensive thrusters on the craft to prevent a crash. It can also be used as a backup landing mechanism in case too many lift thrusters are damaged or destroyed. The block itself is based on the Ship Parachutes mod which was developed by Harax, Mexpex and Draygo.

Usage

To use, place 1 or more parachute hatches on your craft and stock them with canvas. It is recommended to keep parachutes aligned with your center-of-mass, since once the parachute is opened your craft will hang from it at whatever point it is attached. The parachute can be deployed manually by "Opening" the hatch, or automatically at a specified altitude. The hatch will "Close" and the parachute will be automatically detached (and cease to exist) when the craft comes to a complete stop either on the ground or in a hover (if the craft has sufficient downwards thrust and dampeners enabled). The hatch can also be manually closed at any time, discarding the parachute.

Control Panel

Open / Closed Deploys ("Open") or detaches ("Closed") the parachute.
Auto deploy Whether auto deploy is on or off
Auto deploy height Height that the parachute will automatically deploy if auto deploy is On
Min: 10m  Max: 10,000m

Terminal Velocity

When deployed, parachutes quickly slow the craft to a fraction of its original speed, however they do not immediately slow the craft to its terminal velocity. After the rapid deceleration immediately following deployment, the craft will gradually slow to its terminal velocity.

It is possible to calculate a craft's terminal velocity, in order to gauge how soft or hard the landing will be:

Ship-specific variables 

MASS - in kg
GRIDSIZE - 0.5 for small grid parachute, 2.5 for large grid parachute
QTY - number of parachutes

Planet-specific variables 

GRAVITY - in m/s2 (9.81 for Earth-like planets)
ATM - atmosphere, changes with altitude (from 0 to 1.0 on Earth-like planets)

Constants 

RADMULT - radius multiplier, always = 8
REEFLEVEL - reefing level, always = 0.6
CD - drag coefficient, always = 1.0

Calculations 

parachute diameter = (log((10*(ATM-REEFLEVEL))-0.99)+5)*RADMULT*GRIDSIZE

area = PI*(diameter/2)^2

terminal velocity = squareroot((MASS*GRAVITY)/(area*CD*QTY*ATM*1.225*2.5))

Example: Standard Red Ship 

MASS = 2927310
GRIDSIZE = 2.5 (large grid)
QTY = 10 (it's a big ship!)
GRAVITY = 9.81 (we'll say this is an Earth-like planet)
ATM = 0.85 (avoid using 1.0 - 0.85 gives a more conservative result)

diameter = (log((10*(ATM-REEFLEVEL))-0.99)+5)*RADMULT*GRIDSIZE
         = (log((10*(0.85-0.6))-0.99)+5)*8*2.5
         = 103.6

area = PI*(diameter/2)^2
     = 8,429.6

terminal velocity = squareroot((MASS*GRAVITY)/(area*CD*QTY*ATM*1.225*2.5))
                  = squareroot((2927310*9.81)/(8429.6*1.0*10*0.85*1.225*2.5))
                  = 11.4 m/s

Media

  • Two parachutes of different colors, deployed.

  • View of parachutes from below.

  • Large grid and small grid parachute hatch blocks.

Tips

  • Parachutes and mountains do not get along. Where possible, try to use a parachute over low-elevation terrain.
  • Large grid parachutes have 25x more drag than a small grid parachute. Use large grid parachutes for heavy drops.
  • Parachute drag will oppose your direction of motion in atmosphere, even if you are trying to fly UP.
  • You need electrical power on a grid to deploy or cut the chutes, but while the chutes are deployed power is not strictly necessary. The parachute will stay out while the power is gone, and will even stay out if the block is damaged to a non-functional state!
  • On a ship with low weight and many parachutes, parachutes might automatically cut when the ship velocity drops below 2 m/s. If you start falling because of this then the chutes will re-deploy if set for automatic deployment. In Survival Mode this would cause you to expend more canvas. If this happened repeatedly, you could run out of canvas before reaching the ground.

Known Issues

Programming

Update History

Update 1.183.1
  • Fixed parachute not working with conveyor system
Update 1.183.0
  • Parachute Hatch introduced
Retrieved from "http://spaceengineerswiki.com/index.php?title=Parachute_Hatch&oldid=26239"