HomeLatest ThreadsGreatest ThreadsForums & GroupsMy SubscriptionsMy Posts
DU Home » Latest Threads » Forums & Groups » Main » General Discussion (Forum) » NASA Tests "Impossib... » Reply #38

Response to DirkGently (Reply #35)

Fri Aug 1, 2014, 03:52 PM

38. Same difference

Perpetual motion = perpetual energy. Even in space, there's a tiny, micro amount of friction--which would become very, very important as you accelerate.

Effectively, in this case, externally generated electricity turns into thrust. Energy goes into the system. Thrust comes out. It's no different from a conventional rocket except that you don't have to carry fuel.

It's as inaccurate to call this perpetual motion/thrust/energy as it is to call a solar sail perpetual motion. Both simply use external particles--solar photons in the sail's case, particle pairs in this one.

In both cases, however, distance from the Sun matters if you're using solar panels for this engine. They're very nice things, but not terribly effective in the outer solar system and completely ineffective in interstellar space.

We'd need a different energy source to generate electricity further out. Historically, we use a nuclear engine for that. And nobody's claiming you can exploit this quantum trick to generate the electricity that also generates the thrust (if they were, the claim becomes extraordinary and the proof becomes correspondingly more rigorous).

Reply to this post

Back to OP Alert abuse Link to post in-thread

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 108 replies Author Time Post
DirkGently Aug 2014 OP
enlightenment Aug 2014 #1
Logical Aug 2014 #11
enlightenment Aug 2014 #12
backscatter712 Aug 2014 #59
DirkGently Aug 2014 #86
Logical Aug 2014 #87
DirkGently Aug 2014 #88
kelliekat44 Aug 2014 #55
enlightenment Aug 2014 #57
Marr Aug 2014 #100
enlightenment Aug 2014 #103
nashville_brook Aug 2014 #2
Logical Aug 2014 #17
crim son Aug 2014 #27
aint_no_life_nowhere Aug 2014 #89
G_j Aug 2014 #95
Uncle Joe Aug 2014 #3
jeff47 Aug 2014 #4
DirkGently Aug 2014 #8
jeff47 Aug 2014 #20
The Traveler Aug 2014 #24
jeff47 Aug 2014 #26
DirkGently Aug 2014 #30
jeff47 Aug 2014 #32
jberryhill Aug 2014 #101
Uncle Joe Aug 2014 #77
jeff47 Aug 2014 #78
Sirveri Aug 2014 #96
jeff47 Aug 2014 #97
Humanist_Activist Aug 2014 #69
hifiguy Aug 2014 #5
Orrex Aug 2014 #34
hifiguy Aug 2014 #36
Orrex Aug 2014 #37
Frank Cannon Aug 2014 #56
mathematic Aug 2014 #80
Go Vols Aug 2014 #6
MineralMan Aug 2014 #7
Kablooie Aug 2014 #14
MineralMan Aug 2014 #15
Treant Aug 2014 #19
DirkGently Aug 2014 #35
LineLineLineLineLineReply Same difference
Treant Aug 2014 #38
DirkGently Aug 2014 #45
Treant Aug 2014 #50
backscatter712 Aug 2014 #60
sir pball Aug 2014 #74
joshcryer Aug 2014 #79
hunter Aug 2014 #9
DirkGently Aug 2014 #16
colsohlibgal Aug 2014 #10
Bosonic Aug 2014 #13
IDemo Aug 2014 #18
sarisataka Aug 2014 #21
jmowreader Aug 2014 #22
sarisataka Aug 2014 #28
awoke_in_2003 Aug 2014 #49
DirkGently Aug 2014 #53
awoke_in_2003 Aug 2014 #54
DirkGently Aug 2014 #61
DeSwiss Aug 2014 #23
DirkGently Aug 2014 #63
DRoseDARs Aug 2014 #25
paulkienitz Aug 2014 #33
DRoseDARs Aug 2014 #51
Spitfire of ATJ Aug 2014 #29
paulkienitz Aug 2014 #31
Treant Aug 2014 #39
paulkienitz Aug 2014 #43
caraher Aug 2014 #40
Eleanors38 Aug 2014 #42
paulkienitz Aug 2014 #44
caraher Aug 2014 #47
paulkienitz Aug 2014 #104
caraher Aug 2014 #105
paulkienitz Aug 2014 #107
caraher Aug 2014 #108
silverweb Aug 2014 #41
Rex Aug 2014 #46
DirkGently Aug 2014 #48
Rex Aug 2014 #52
nashville_brook Aug 2014 #62
backscatter712 Aug 2014 #58
Rex Aug 2014 #81
nashville_brook Aug 2014 #64
Motown_Johnny Aug 2014 #65
DirkGently Aug 2014 #66
Motown_Johnny Aug 2014 #67
Humanist_Activist Aug 2014 #68
DirkGently Aug 2014 #71
Humanist_Activist Aug 2014 #82
DirkGently Aug 2014 #83
Marr Aug 2014 #102
derby378 Aug 2014 #70
DirkGently Aug 2014 #72
derby378 Aug 2014 #73
DirkGently Aug 2014 #85
derby378 Aug 2014 #90
DirkGently Aug 2014 #91
derby378 Aug 2014 #92
Hugabear Aug 2014 #99
struggle4progress Aug 2014 #75
DirkGently Aug 2014 #84
intaglio Aug 2014 #76
backscatter712 Aug 2014 #93
DirkGently Aug 2014 #94
Rex Aug 2014 #98
Nye Bevan Aug 2014 #106
Please login to view edit histories.