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RE: Alan CalverdI would like to hear your take on Thermal Mass . This being the increase in invariant mass caused by significantly raised or lowered temperature . It is a tiny , but measurable difference . This means that raising & lowering the temp. of a free-piston in an engine could give you a weak , but extant , reactionless drive . Whoa , Unnecessary Zoom ! Unnecessary Zoom ! Now my head won't fit through the door dagnabbit !Otay , need wood saw . Bye , PM.
You task me , Alan Calverd ! But I shall think 3 dimensionally ! I believe ye are referring to the slight drag the piston accrues as it intercepts the photons from the cylinders emitters . The easy answer is to have the piston be irradiated almost instantly when it is TDC ( top dead center ) , then allow it to radiate the heat away as it traverses the cylinder. When pushed from Hot TDC it should weigh more than when it reaches Cold TDC . Ignoring drag throughout it's travel , the impact ( yank ) at the cold end should be marginally less than the force applied ( shove ) . If 100% of the remaining momentum is used up on the return stroke , overcoming friction , then the cycle can be repeated endlessly . This would produce slightly more force applied on the action end , than on the reaction end . Just finish the cooling before Cold TDC and you are good-to-go . I do believe I have you fellow big-head ! You can scream " Khaaan ! " now ! Just remember , in space , no one can hear you... , well , you know the saying . Adios Amigos , I'm off to get my pimples popped ! P.M.
To: Janus Effect You sound like a Doc Brown devotee ! Dogma & Doctrine not be the best way to make new discoveries .
Neither is floating out wild ideas without any basis in reality
Several prototypes of this concept have been constructed and tested, including by the Advanced Propulsion Physics Laboratory at NASA. As of 2017, a few tests of prototype drives were reported to produce a small apparent thrust,[9] while other prototype tests did not report any thrust. No prototype has been successfully tested more than once.
The laws of physics are correct only until a counter example is found to exist consistently. The same section of NASA is working on Warp Field Mechanics. A method to travel back in time is taught at MIT by some of the top ranking physicists in the world. Its called the Gott Time Machine. One day antigravity is unheard of and the next its being used by Einstein to create a static universe and later to create the inflationary model of the universe, vacuum domain walls and cosmic strings.
Warp Drive antigravity and dark energy, are stuff of science fiction which might one day become fact.
Quote from: JanusNeither is floating out wild ideas without any basis in realityHere's a basis in reality of a reactionless drive. Have you ever heard of the EM drive? It's under development at NASA's Johnson Space Station Advanced Propulsion Physics Laboratory. See: https://en.wikipedia.org/wiki/RF_resonant_cavity_thrusterWhether it works or not is still being investigated. As that website states, i.e. QuoteSeveral prototypes of this concept have been constructed and tested, including by the Advanced Propulsion Physics Laboratory at NASA. As of 2017, a few tests of prototype drives were reported to produce a small apparent thrust,[9] while other prototype tests did not report any thrust. No prototype has been successfully tested more than once. Probably a loose cable or something. But its something which is being taken seriously.
I think your flash light produces 1 N of thrust for every 300 megawatts of radiation it produces
Classically , light has not been considered a " thing " because it is a disturbance , not an object . This is why it has no rest mass , only virtual mass . This is analogous to waves in water . They are disturbances , not something that was thrown in . Have you noticed how poor waves are at moving floating objects ? Lightwaves similar . By the way , the mass differential between hot and cold objects is actual measured , scientific fact . Think relativity ; Energy=Mass . Using different mass/energy densities is the operating principle for most engines .OK , you got yer Gerber .Don't worry , be happy ! P.M.
To : Pimby Phi & Janus Effect Gentlemen , it's Hammer Time !Consider a free-floating toy car racetrack , complete w/several pinballs circulating around it separately . Momentarily , a friction-pad pops up , and slows one of the balls way down . A series of collisions then ensues , which cause the entire track to slowly move in one direction . If the track mechanism regularly brings the ball's back up to speed , the process can be repeated endlessly . This , also , would constitute a DEFACTO reactionless drive . It might have 1% efficiency when refined , versus the .00000001% efficiency of a photon drive . The Photonic Rocket definitely " Can't Touch This ! " .As was previously agreed , R.D.s work by ejecting/transmuting energy ( not matter ) uni-directionally . I will take your bows now . P.M.
To : Kryptic God of Science .
The word of the day is CONTRA-ROTATION . Two units linked together prevent net torque upon the ship . Worked great for P-38s , works great elsewhere too . Think gyroscopic stabilizers . Spinning up the balls contra/symmetrically is also necessary . Okay , I still champ ! P. M.