## Search found 1131 matches

Mon Dec 17, 2012 9:35 pm
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
...the ability to generate large thrusts..you need to be ..running on resonance ... If you put a tuned circuit (the piezo and the ceramics) in the feedback loop of an amplifier you get an oscillation at the resonant frequency. (GIT = EE fail ) You need electrical and mechanical resonance simultaneo...
Thu Dec 13, 2012 10:28 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
Is the 'scalar gravity potential' not 'g' here on earth? No, that's the gradient of the gravitational potential, and it's a vector. Not quite the same thing... So, next, one needs to look at whether 'mass fluctuations' can occur. The very essential notion of this, irrespective of any mathematical a...
Thu Dec 13, 2012 9:52 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
@happyjack27: When I said "entropy", I meant what the poster I was responding to seemed to mean by it - the principle of nondecrease of entropy, which I also referred to as the "entropy condition". Known in continuum mechanics as the Clausius-Duhem inequality, as I recall. It's not so much a fundame...
Wed Dec 12, 2012 1:24 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
State which line the error of premise occurs: 1) A 1 kg test thruster is subjected to a 130 uN of thrust generated by a 'Mach thruster' driven by a nuclear thermal battery that has an output electronically governed to 1 W. 2) It accelerates for 10 years (call it 300 Ms) from a given rest frame at w...
Tue Dec 11, 2012 9:41 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
It's (3).

Hint: Define "expended"...

You could in principle be describing a magsail.
Tue Dec 11, 2012 2:38 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
That reminds me - sfuerst is complaining (again) about mass-energy dipoles being impossible in tensor GR; that the lowest-order arrangement possible is a quadrupole, and that this invalidates M-E.

Did that ever get a satisfactory public answer?
Tue Dec 11, 2012 1:13 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
Accelerate at 1 gee half way and decelerate at 1 gee the second half of the trip. Time to the Moon is about 5 hours. To Mars at its furthest approach to Earth is 2 days. Jupiter is 7, Saturn is 9... At the time when Paul and I did this, just after STAIF '06, Jim warned us that this needs a relativi...
Tue Dec 11, 2012 12:12 am
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
I don't think you need to account for propellant when you're not driving a wormhole condition. You're wrong. Jim showed that if you use the GR tool, you get the right numbers for anything. What GR tool? The issue is really that dV is linear and dE is quadratic, so whenever we do these calculations ...
Mon Dec 10, 2012 11:49 pm
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
My whole point about exhaust velocity is that the exhaust is part of the problem that you can't neglect without getting an apparent conservation violation. This is why GoatGuy and chrismb get an apparent violation from M-E - they don't consider the reaction mass. It's the exact same reason you got a...
Mon Dec 10, 2012 11:10 pm
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
GIThruster, what's "wrong with the math" in your example is that the propellant kinetic energy is unaccounted for. The propellant question is not a red herring; it's central to the issue. That's why I suggest one do the calculations with a Hall or Ion thruster, because the energy into the thruster ...
Mon Dec 10, 2012 10:38 pm
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
So just look at the kinetic energy of the rocket. That, alone, cannot be greater than the sum energy expended, let alone some propellant floating around too. That only works if you're hauling propellant around, and/or the propellant used throughout the acceleration is known to be initially stationa...
Mon Dec 10, 2012 8:40 pm
Forum: News
Topic: Mach Effect progress
Replies: 2668
Views: 796417
If you're going to assess energy conservation in a thruster, you have to account for both the thruster (and whatever's attached to it) and its propellant. This is what makes rockets conserve energy - the chemical energy in the propellant is converted into a fixed amount of kinetic energy inherent in...
Fri Dec 07, 2012 10:25 pm
Forum: News
Topic: New Engine Technology
Replies: 30
Views: 8211
Skylon's max takeoff weight was about 325 tonnes, last I heard of the in-progress D1 design (last year). The C1 used in the pictures was 275 tonnes. It's mostly liquid hydrogen, in nonstructural tanks in an airship-style structural frame covered in a nonstructural composite skin; it's a lot lighter ...
Wed Dec 05, 2012 9:36 am
Forum: General
Topic: Minimum size of a power producing polywell?
Replies: 24
Views: 3903
The shielding thickness for a 60 MW P-B11 reactor verses a 6 GW reactor would be less. My understanding of radiation shielding is that a certain thickness of a material would be required to stop 90% (or some other selected portion) of the radiation. An additional same thickness of material would st...
Sun Dec 02, 2012 6:02 am
Forum: General
Topic: Infrastructure Reforms
Replies: 299
Views: 24709
I'm not refering to The Exponential Function but rather what are generally known as exponential functions which are indeed as I described, one that grows exponentially. http://oregonstate.edu/instruct/mth251/cq/FieldGuide/exponential/lesson.html I noted the general case myself - but you used the ex...