Difference between revisions of "Reaction wheel"
From Kerbal Space Program Wiki
(Created page with "A '''reaction wheel''' provides torque to a craft and allows it to rotate in space with using only electric charge and is thus available as long as there is a electric pow...") |
(+text about location of reaction wheels; *hide parts without reaction wheels;) |
||
| Line 1: | Line 1: | ||
A '''reaction wheel''' provides torque to a craft and allows it to rotate in space with using only [[electric charge]] and is thus available as long as there is a electric power generator on board. | A '''reaction wheel''' provides torque to a craft and allows it to rotate in space with using only [[electric charge]] and is thus available as long as there is a electric power generator on board. | ||
| − | All [[command module]]s except the [[EAS-1 External Command Seat]] have a reaction wheel and can provide torque. Adding additional parts utilising torque allows faster change in rotation. | + | All [[command module]]s except the [[EAS-1 External Command Seat]] have a reaction wheel and can provide torque. Adding additional parts utilising torque allows faster change in rotation. The placement does matter for reaction wheels. Generally speaking they can cause some problems if placed far from the center of mass. They function like grabbing the point where the reaction wheel is located and rotating around that point. The rotation will get anywhere other then near the center fo mass.<ref>[http://forum.kerbalspaceprogram.com/entry.php/740#comment4254 Answer from C7] in his blog entry “[http://forum.kerbalspaceprogram.com/entry.php/740 Updated Information on SAS in 0.21.1]”</ref> |
To operate reaction wheels electric power needs to be available. The electric consumption is defined by it's torque. While command modules needs 0.1× the electric charge to generate the maximum torque (e.g. a torque of 4.2 needs 0.42 E), all dedicated parts needs only 0.3 E but supplying 20 torque (0.015×). | To operate reaction wheels electric power needs to be available. The electric consumption is defined by it's torque. While command modules needs 0.1× the electric charge to generate the maximum torque (e.g. a torque of 4.2 needs 0.42 E), all dedicated parts needs only 0.3 E but supplying 20 torque (0.015×). | ||
| Line 8: | Line 8: | ||
== Reaction wheels == | == Reaction wheels == | ||
| − | |||
===Dedicated Units=== | ===Dedicated Units=== | ||
| − | {{Stats Table SAS}} | + | {{Stats Table SAS|torque=Yes}} |
===Command Pods=== | ===Command Pods=== | ||
| − | {{Stats Table Command Pods}} | + | {{Stats Table Command Pods|torque=Yes}} |
| + | |||
| + | == Notes == | ||
| + | <references /> | ||
[[Category:Control]] | [[Category:Control]] | ||
Revision as of 08:24, 14 August 2013
A reaction wheel provides torque to a craft and allows it to rotate in space with using only electric charge and is thus available as long as there is a electric power generator on board.
All command modules except the EAS-1 External Command Seat have a reaction wheel and can provide torque. Adding additional parts utilising torque allows faster change in rotation. The placement does matter for reaction wheels. Generally speaking they can cause some problems if placed far from the center of mass. They function like grabbing the point where the reaction wheel is located and rotating around that point. The rotation will get anywhere other then near the center fo mass.[1]
To operate reaction wheels electric power needs to be available. The electric consumption is defined by it's torque. While command modules needs 0.1× the electric charge to generate the maximum torque (e.g. a torque of 4.2 needs 0.42 E), all dedicated parts needs only 0.3 E but supplying 20 torque (0.015×).
This is one of the systems used by the Stability Augmentation System.
Reaction wheels
Dedicated Units
| Image | Part | Radial size | Cost (  ) |
Mass (t) |
Max. Temp. (K) |
Tolerance (m/s) |
Tolerance (g) |
Torque (kN·m) |
Electricity (⚡/s) |
|---|---|---|---|---|---|---|---|---|---|
 |
Small Inline Reaction Wheel | Tiny | 600 | 0.05 | 2 000 | 9 | 50 | 5 | 0.25 (15 ⚡/min) |
 |
Advanced Inline Stabilizer | Small | 1 200 | 0.1 | 2 000 | 9 | 50 | 15 | 0.45 (27 ⚡/min) |
 |
Advanced Reaction Wheel Module, Large | Large | 2 100 | 0.2 | 2 000 | 9 | 50 | 30 | 0.6 (36 ⚡/min) |
Command Pods
| Image | Part | Radial size | Cost ( ) |
Mass (t) |
Max. Temp. (K) |
Tolerance (m/s) |
Tolerance (g) |
Torque (kN · m) |
S.A.S. level |
Required Crew/ Power |
Capacity (⚡) |
|---|---|---|---|---|---|---|---|---|---|---|---|
 |
Mk1 Cockpit | Small | 1 250 (1 241) |
1.28 (1.25) |
2 000 (1 100) |
40 | 50 | 10 |  [Note 1]
|
|
50 ⚡ 7.5  MP
|
 |
Mk1 Inline Cockpit | Small | 1 600 (1 591) |
1.03 (1.00) |
2 000 (1 100) |
40 | 50 | 10 | [Note 1]
|
|
50 ⚡ 7.5 MP
|
 |
Mk2 Cockpit | Mk2 | 3 500 (3 482) |
2.06 (2.00) |
2 500 (1 400) |
45 | 50 | 15 | [Note 1]
|
+
|
150 ⚡ 15 MP
|
 |
Mk2 Inline Cockpit | Mk2 | 3 500 (3 470) |
2.10 (2.00) |
2 500 (1 400) |
45 | 50 | 15 | [Note 1]
|
+
|
150 ⚡ 25 MP
|
 |
Mk3 Cockpit | Mk3, Small | 10 000 (9 880) |
3.90 (3.50) |
2 700 (1 500) |
50 | 50 | 40/40/20[Note 2] | [Note 1]
|
+
|
500 ⚡ 100 MP
|
 |
Mk1 Command Pod | Small, Tiny | 600 (588) |
0.84 (0.80) |
2 200 (1 200) |
14 | 50 | 5 | [Note 1]
|
|
50 ⚡ 10 MP
|
 |
Mk1-3 Command Pod | Large, Small | 3 800 (3 764) |
2.72 (2.60) |
2 400 (1 400) |
45 | 50 | 15 | [Note 1]
|
+
|
150 ⚡ 30 MP
|
 |
Mk1 Lander Can | Small | 1 500 (1 482) |
0.66 (0.60) |
2 000 (1 000) |
8 | 50 | 3 | [Note 1]
|
|
50 ⚡ 15 MP
|
 |
Mk2 Lander Can | Large | 3 250 (3 202) |
1.515 (1.355) |
2 000 (1 200) |
8 | 50 | 15 | [Note 1]
|
+
|
100 ⚡ 40 MP
|
 |
PPD-12 Cupola Module | Large, Small | 3 200 (3 188) |
1.80 (1.76) |
2 000 (1 000) |
8 | 50 | 9 | [Note 1]
|
|
200 ⚡ 10 MP
|
 |
Probodobodyne HECS | Tiny | 650 | 0.1 | 1 200 | 12 | 50 | 0.5 | 1 | 1.5 ⚡/min (90 ⚡/h) |
10 ⚡ |
 |
Probodobodyne OKTO | Tiny | 450 | 0.1 | 1 200 | 12 | 50 | 0.3 | 0 | 1.2 ⚡/min (72 ⚡/h) |
10 ⚡ |
 |
Probodobodyne HECS2 | Small | 7 500 | 0.2 | 2 000 | 8 | 50 | 10 | 3 | 3.0 ⚡/min (180 ⚡/h) |
1 000 ⚡ |
 |
RC-001S Remote Guidance Unit | Small | 2 250 | 0.1 | 2 000 | 9 | 50 | 0.5 | 3 | 3.0 ⚡/min (180 ⚡/h) |
15 ⚡ |
 |
RC-L01 Remote Guidance Unit | Large | 3 400 | 0.5 | 2 000 | 9 | 50 | 1.5 | 3 | 4.8 ⚡/min (288 ⚡/h) |
30 ⚡ |
 |
MK2 Drone Core | Mk2 | 2 700 | 0.2 | 2 500 | 20 | 50 | 15/3/3[Note 2] | 3 | 3.0 ⚡/min (180 ⚡/h) |
250 ⚡ |
 |
MPO Probe | Small | 9 900 (9 854) |
0.895 (0.395) |
2 200 | 9 | 50 | 6 | 3 | 3.0 ⚡/min (180 ⚡/h) |
1 000 ⚡ 45 LF55 O
|
 |
MTM Stage | Small | 21 500 (6 300) |
0.795 (0.415) |
2 200 | 12 | 50 | 12 | 2 | 1.8 ⚡/min (108 ⚡/h) |
4 000 ⚡ 3 800  XE
|
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 In the "Career" mode in manned command modules, the performance and functionality of the SAS is determined by the presence of at least one kerbonaut with the specialization "Pilot" and the level of his specialization. In the "Science" and "Sandbox" modes, a kerbonaut with any specialization can use all the functionality of the SAS on board the manned command module without restrictions.
- ↑ 2.0 2.1 Torque differs between axes. These numbers are for pitch/yaw/roll respectively.
Notes
- ↑ Answer from C7 in his blog entry “Updated Information on SAS in 0.21.1”
