Reactionless drives...

BobTPH

Joined Jun 5, 2013
11,535
Trying to imagine the size and weight of a sustained fusion reactor for the magnetic fusion drive. I'm guessing we are at least a few orders of magnitude away from practical now.
 

nsaspook

Joined Aug 27, 2009
16,330
https://www.nextbigfuture.com/2024/01/darpa-partially-funded-quantum-space-drive-orbital-test.html


As of January 2024, there have been no public statements from either Rogue Space Systems or IVO Limited regarding the performance of the experimental propulsion system. Independent analysis of the satellite’s TLE data indicates a gradual decay in its orbital altitude.

IVO claims that its engine can get 52 millinewtons (mN) of thrust from just one watt of electricity. If true, that’s a huge step up from Hall-Effect thrusters (also known as ion thrusters), which have an overall lower energy efficiency. The Quantum Drive is also only 300 grams, whereas an ion engine can weigh upward of 200 kilograms. Hall thrusters have a thrust-to-power ratio of about 60 mN/kW. The IVO would be nearly 1000 times more powerful for the same power as Hall Effect Thruster.
"Yes. It is a disgrace that bull…t like this is pushed and financed. It all boils down to scientific illiteracy. It is exactly like saying “if magic carpets could fly we could use them to send stuff tu mars, please pay me millions si that i can verify if my loom can produce magic carpets…"
"
At more than 10 meters per second, the whole contraption would generate MORE energy (as kinetic energy) than invested into its thruster. 10 m/s isn’t very fast; one could conjure up large flywheels with these devices on the rim to provide the thrust well in excess of invested energy to make never-ending electricity generators. Brilliant!

The space travel gambit is sure sexy-enough-to-get-millions of investment monies. But the real money is in having huge flywheels making FREE energy, down here on Planet Dirt. Us babbling Terrans could use a whole lot of free energy.
________________________________________

In short, this doesn’t pass the Free Energy sniff test."

+1 those comments.
 

joeyd999

Joined Jun 6, 2011
6,323
https://www.nextbigfuture.com/2024/01/darpa-partially-funded-quantum-space-drive-orbital-test.html




"Yes. It is a disgrace that bull…t like this is pushed and financed. It all boils down to scientific illiteracy. It is exactly like saying “if magic carpets could fly we could use them to send stuff tu mars, please pay me millions si that i can verify if my loom can produce magic carpets…"
"
At more than 10 meters per second, the whole contraption would generate MORE energy (as kinetic energy) than invested into its thruster. 10 m/s isn’t very fast; one could conjure up large flywheels with these devices on the rim to provide the thrust well in excess of invested energy to make never-ending electricity generators. Brilliant!

The space travel gambit is sure sexy-enough-to-get-millions of investment monies. But the real money is in having huge flywheels making FREE energy, down here on Planet Dirt. Us babbling Terrans could use a whole lot of free energy.
________________________________________

In short, this doesn’t pass the Free Energy sniff test."

+1 those comments.
It's immoral to let a sucker keep his money.
 

nsaspook

Joined Aug 27, 2009
16,330
It seems a little convenient that the cubesat went bust before the quantum drives could even be activated.
https://thedebrief.org/breaking-sat...-space-test-of-physics-defying-quantum-drive/
Rogue Space Systems has announced the failure of its Barry 1 satellite, which occurred before the company could test a controversial quantum drive propellantless propulsion system.

In a posted statement, the company said Barry 1 was able to complete a portion of its primary mission, including tests of their Scalable Compute Platform (SCP). Unfortunately, they lost contact with the satellite before they could perform any tests of IVO Ltd.’s Quantum Drive.
 

Thread Starter

cmartinez

Joined Jan 17, 2007
8,777
OMG. What a load of crackpot crap. Woodward is a total crackpot and IMO anyone that listens to him risks permanent brain damage.
It draws my attention that two "respectable" physics professors can pursue this sort of thing ... brb, gotta go make an appointment with my neurologist
 

nsaspook

Joined Aug 27, 2009
16,330
As usual, she's exactly right and It will violate causality if you have more than one warp-drive ship. With two you can devise a CTC to travel (physically or informationally) to your past self.
https://en.wikipedia.org/wiki/Closed_timelike_curve
One feature of a CTC is that it opens the possibility of a worldline which is not connected to earlier times, and so the existence of events that cannot be traced to an earlier cause. Ordinarily, causality demands that each event in spacetime is preceded by its cause in every rest frame. This principle is critical in determinism, which in the language of general relativity states complete knowledge of the universe on a spacelike Cauchy surface can be used to calculate the complete state of the rest of spacetime. However, in a CTC, causality breaks down, because an event can be "simultaneous" with its cause—in some sense an event may be able to cause itself. It is impossible to determine based only on knowledge of the past whether or not something exists in the CTC that can interfere with other objects in spacetime. A CTC therefore results in a Cauchy horizon, and a region of spacetime that cannot be predicted from perfect knowledge of some past time.

https://en.wikipedia.org/wiki/Tachyonic_antitelephone

Benford et al.[5] wrote about such paradoxes in general, offering a scenario in which two parties are able to send a message two hours into the past:

The paradoxes of backward-in-time communication are well known. Suppose A and B enter into the following agreement: A will send a message at three o'clock if and only if he does not receive one at one o'clock. B sends a message to reach A at one o'clock immediately on receiving one from A at three o'clock. Then the exchange of messages will take place if and only if it does not take place. This is a genuine paradox, a causal contradiction.
They concluded that superluminal particles such as tachyons are therefore not allowed to convey signals.
 
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Thread Starter

cmartinez

Joined Jan 17, 2007
8,777
Yet another quack?


“Essentially, what we’ve discovered is that systems that contain an asymmetry in either electrostatic pressure or some kind of electrostatic divergent field can give a system of a center of mass a non-zero force component,” Buhler explained. “So, what that basically means is that there’s some underlying physics that can essentially place force on an object should those two constraints be met.”
 

nsaspook

Joined Aug 27, 2009
16,330
Complete babbling pseudoscience. "Some underlying physics" means total B.S. I just made up.
“Essentially, what we’ve discovered is that systems that contain an asymmetry in either electrostatic pressure or some kind of electrostatic divergent field can give a system of a center of mass a non-zero force component,” Buhler explained. “So, what that basically means is that there’s some underlying physics that can essentially place force on an object should those two constraints be met.”
This crap is not even wrong.
 
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