Well, mister garcia. I almost belived you... till "IE was far superior to Mozilla" comment. Sorry, after Opera, Mozilla feels a bit sluggish, but IE just unbearable -- long unexplained delays with no indication of doing anything, no reaction to mouse -- nothing, brain dead.
Fare well, mister garcia. I'm going exactly in opposite direction for reasons too long to explain here. Biggest one is Q: "Who owns your arse?" -- I'm dead serious:-|
the photons reflecting off the sail are red-shifted by the sail's motion, removing energy from the photons and imparting it to the sail by accelerating it.
Does it imply, that faster SAT spinning, more energy it extracts? IMHO photons do not red-shifted by sail. From sail point of view they are already red.
Regarding sunlight pressure on SAT, I would be much more easily convinced with theory that sun heats up surface of SAT and excited atoms blows away like from nanojets.
Then there is solar wind. Sounds like real application for sails;)
You can absorb as much enegy as you wish, but without matter it useless. E=m*c*c should give you an idea of how much reactive mass you can squeeze out of this.
When the sail is moving, then the reflected photons are Doppler shifted, and leave the sail with lower energy than they arrived.
Holy cow! Faster you move -- more impulse you receive!!
------------------- And going towards another star wouldn't help, because you can't sail against the "wind" in this case (ship sails can because of how the wind will curve and press on the sail in a different direction than what it was originally travelling, which won't happen with light). -------------------
Ships goes agains wind not because there is sail, it's because there are _two_ "sails": sail and _keel_. Water resistance is what makes it work. Without it, ship will gone with a wind, like a balloon does.
Look at the kite -- it goes up because of the rope it can hold on against wind. Cut the rope and kite goes down. Same with a solar sailing -- gravity is the rope you holding on.
BTW I am not convinced that sail will work against sunlight, but there is a solar "wind" (particles) and against that, sail will certainly work.
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So money saved on outsorcing will go to testers and lawers. Is it really worth it?
Well, mister garcia. I almost belived you... till "IE was far superior to Mozilla" comment. Sorry, after Opera, Mozilla feels a bit sluggish, but IE just unbearable -- long unexplained delays with no indication of doing anything, no reaction to mouse -- nothing, brain dead.
:-|
Fare well, mister garcia. I'm going exactly in opposite direction for reasons too long to explain here. Biggest one is Q: "Who owns your arse?" -- I'm dead serious
Does it imply, that faster SAT spinning, more energy it extracts? IMHO photons do not red-shifted by sail. From sail point of view they are already red.
Regarding sunlight pressure on SAT, I would be much more easily convinced with theory that sun heats up surface of SAT and excited atoms blows away like from nanojets.
Then there is solar wind. Sounds like real application for sails ;)
You can absorb as much enegy as you wish, but without matter it useless. E=m*c*c should give you an idea of how much reactive mass you can squeeze out of this.
- Sun emits "yellow" photons.
- Observer on runaway sail, due to Doppler, see "red" photons.
- Sail reflects perfectly "red" photons back to the sun.
Where you got an idea, that changing wavelength accomplished by loss of energy?
When the sail is moving, then the reflected photons are Doppler shifted, and leave the sail with lower energy than they arrived. Holy cow! Faster you move -- more impulse you receive!!
-------------------
And going towards another star wouldn't help, because you can't sail against the "wind" in this case (ship sails can because of how the wind will curve and press on the sail in a different direction than what it was originally travelling, which won't happen with light).
-------------------
Ships goes agains wind not because there is sail, it's because there are _two_ "sails": sail and _keel_. Water resistance is what makes it work. Without it, ship will gone with a wind, like a balloon does.
Look at the kite -- it goes up because of the rope it can hold on against wind. Cut the rope and kite goes down. Same with a solar sailing -- gravity is the rope you holding on.
BTW I am not convinced that sail will work against sunlight, but there is a solar "wind" (particles) and against that, sail will certainly work.