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Previous posting in this Debunking Series.

In this post we will look at the last three types of engines. Can these engine technologies be debunked?

Start with the boring stuff. Nuclear/plasma engines. For more information look up Franklin Chang-Diaz’s Variable Specific Impulse Magnetoplasma Rocket (VASIMR). Real. Cannot be debunked.

Now for the more interesting stuff. The second is Pulse Detonation Engines (PDE). This type of engine uses detonation waves to combust fuel and oxidizer mixture. “The engine is pulsed because the mixture must be renewed in the combustion chamber between each detonation wave initiated by an ignition source.” Theoretically this type of engine is capable of speeds from subsonic to Mach 5.

Here is an UT Arlington Feb 2008 YouTube video that shows how elegantly simple, a workable engineering concept is. According to the posting this engine was built and tested in 2005.

Here is a link to Mojave Skies blog posting which shows photographs of an Air Force Research Laboratory (AFRL) subsonic pulsed detonation engine trials (about May 2008), made from off-the-shelf automotive parts. Impressive!

Some history regarding the Mojave Skies blog posting. Scaled Composites is led by Burt Rutan, whose team won the Ansari X-Prize in 2004. Scaled Composites is now owned by Northrup Grumman a defense contractor. What a small world. Everyone is interconnected to everyone else.

What about supersonic trials?

Here is a link to Military, Aviation & Space forum where the jet plumes appeared to be pulsed. The date of this posting is Feb 2008, while the AFRL’s press release is dated May 2008. Here is the AboveTopSecret’s link to a Jun 2008 discussion about what appears to be PDE aircrafts in action. The writers appear to be experienced and leaning toward the PDE aircrafts in the video being real.

My guess is that conventional fuel pulse detonation engines are a reality in experimental supersonic aircrafts, and that the May 2008 AFRL’s press release is about making PDEs cheaper. These engines are real and cannot be debunked.

Now for the third type of engine technology, atomic bomb or nuclear pulse engines. It is quite obvious from the Medusa design that the nuclear energy released by such a device that is used to propel this starship is only 1/6th of the useful energy. Note, useful energy is less than total energy released. Therefore this is an inefficient design.

Further, as the Wikipedia article on nuclear pulse engines points out, there is the Partial Test Ban Treaty that makes such engines illegal. Debunked.

Therefore, nuclear or atomic bomb pulsed engines are debunked, and people who support such ideas are out of touch with reality. Let me quote Billy Currington “God is great, beer is good, people are crazy”.

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Benjamin T Solomon is the author & principal investigator of the 12-year study into the theoretical & technological feasibility of gravitation modification, titled An Introduction to Gravity Modification, to achieve interstellar travel in our lifetimes. For more information visit iSETI LLC, Interstellar Space Exploration Technology Initiative.

Solomon is inviting all serious participants to his LinkedIn Group Interstellar Travel & Gravity Modification.

Previous post in this Debunking Series.

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This video was broadcast on G4TV, September 19th 2012.

http://www.g4tv.com/videos/60838/dr-eric-w-davis-on-new-light-speed-breaking-science/

Major Notes from the Video are:

a. Dr. Eric Davis, Senior Research Physicist at the Institute for Advanced Studies, Austin TX.

b. Use exotic energy, quantum energy from vacuum energy, to generate warp drive by surfing space.

c. Surfing on space at faster than the velocity of light.

d. Theory requires stupendous amount of vacuum energy.

e. Sonny White (correct name?) suggests that it could be done with much less energy.

f. Disruptive innovations can happen at any time.

g. Richard Obousy of Icarus Interstellar Inc, using string quantum theory shows that the limit of velocity is 10E32 x c (velocity of light) using quantum string theories.

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Need to bear in mind that for interstellar travel to become a reality three factors must be realized.

1) Costs:

From the video this group has not been able to quantify their costs.

2) Technological Feasibility:

As Dr Eric Davis states it might take anywhere from a 100 year to 200 years for this technology to become a reality, but you never know that some disruptive innovation might change all that.

There is another problem with this. Dr. Robert Nemiroff’s Three Photon Observation, which suggests that quantum foam may not exists, therefore falsifying the ability to do interstellar travel in this manner.

Actually come to think about Dr. Eric Davis was describing Dr. Miguel Alcubierre work but substituting Alcubierre’s General Relativity tensors solutions with ‘string quantum’ theory.

3) Safety: Don’t know how to navigate or how to protect crew.

That is a fail on all three counts.

Finally, if I remember correctly, the string theories sits on top of quantum theory and therefore all the discoveries in quantum theory have been translated into string theories. But the string theories by themselves have not been able to predict any new physical behavior, in an ‘a priori’ manner.

For a simple description of quantum foam and vacuum energy see, here.

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I put forward a test for these type of proposals, in the comments section of an earlier posting,

https://lifeboat.com/blog/2012/10/debunking-antimatter-rockets-for-interstellar-travel

And here it is, if you had a few millions dollars can you demonstrate experimental feasibility as a propulsion device?

If the answer is ‘no’ then it is debunked if it is ‘yes’ then let’s get the funding. From Dr Eric Davis comments it is clear that the answer is ‘no’.

Appreciate your comments & feedback.

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Benjamin T Solomon is the author & principal investigator of the 12-year study into the theoretical & technological feasibility of gravitation modification, titled An Introduction to Gravity Modification, to achieve interstellar travel in our lifetimes. For more information visit iSETI LLC, Interstellar Space Exploration Technology Initiative.

Solomon is inviting all serious participants to his LinkedIn Group Interstellar Travel & Gravity Modification.

Previous Post in this Debunking Series.

Why is it necessary to debunk bad or unrealistic technologies? If don’t we live in a dream world idealized by theoretical engineering that has no hope of ever becoming financially feasible. What a waste of money, human resources and talent. I’d rather we know now upfront and channel our energies to finding feasible engineering and financial solutions. Wouldn’t you?

We did the math required to figure out the cost of antimatter fuel one would require just to reach 0.1c and then cost at that velocity, never mind about reaching Alpha Centauri.

Table 2: Antimatter Rocket Fuel Costs to Alpha Centuariat 0.1c (in metric tons)
Source of Estimates Amount of Antimatter Required Maximum Velocity

Spacecraft Mass

Cost of Antimatter per kg
(metric tons) (metric tons)

Gerald Smith

NASA

2.5E+16

6.25E+16

Total $ Cost of Fuel for Trip
A Poor Formula for Interstellar Travel

5

 0.1c

2,000

1.25E+20

3.13E+20
Project Valkyrie

100

 0.1c

100

2.5E+21

6.25E+21

The table above compiled from various sources shows that the cheapest cost of just reaching 0.1c velocity is of the order of $125,000,000,000,000,000,000. This so unthinkably large even I don’t know how to conceptualize it, and by comparison, conventional rockets appear realistic!

Also note that the large variations in the estimates of the amount of antimatter required combined with the larger variations in the mass of the spacecraft antimatter engines could propel. That is no one reallys has a handle on what this would take.

But wait, let me quote EJ Opik, “Is Interstellar Travel Possible?” Irish Astronomical Journal, Vol 6, page 299.

The exhaust power of the antimatter rocket would equal the solar energy power received by the earth — all in gamma rays (and Opik quotes Carl Sagan, Planet. Space Sci., pp. 485–498, 1963) “So the problem is not to shield the payload, the problem is to shield the earth”

I don’t need to say more. Debunked.

Next psot in this Debunking Series.

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Benjamin T Solomon is the author & principal investigator of the 12-year study into the theoretical & technological feasibility of gravitation modification, titled An Introduction to Gravity Modification, to achieve interstellar travel in our lifetimes. For more information visit iSETI LLC, Interstellar Space Exploration Technology Initiative.

Solomon is inviting all serious participants to his LinkedIn Group Interstellar Travel & Gravity Modification.

Previous Post in this Debunking Series.

Why is it necessary to debunk bad or unrealistic technologies? If don’t we live in a dream world idealized by theoretical engineering that has no hope of ever becoming financially feasible. What a waste of money, human resources and talent. I’d rather we know now upfront and channel our energies to finding feasible engineering and financial solutions. Wouldn’t you?

We did the math required to figure out how much fuel one would require just to reach 0.1c and then cost at that velocity until you reach Alpha Centauri and reverse thrust to orbit the star.

Table 1: Conventional Rocket Fuel Costs to travel to Alpha Centauri at 0.1c
Maximum Velocity (km/s)

1980’s cost ($/lb)

Proportion by Weight

Amount (lb)

Cost (in 1980 $)
Apollo Fuel Mass

11.2

5,625,000

$20,250,000.00
Alpha Centauri Liquid H2

0.1c or 29,970 km/s

$3.60

82.46%

6.60E+13

$237,473,684,210,526
LOX

$0.08

17.54%

1.40E+13

$1,122,807,017,544
Total

8.00E+13

$238,596,491,228,070
Note: 1) Fuel mass required to reach 0.1c or 29,970 km/s is twice 5,625,000*(29,979/11.2)^2,
once to accelerate 0.1c on leaving Earth and a second time to decelerate at mid
journey to arrive at zero km/s
2) 8.00E+13 lbs converts into 36,287,389,600 metric tons

This analysis assumes that your payload is the about the same size as the Apollo 11 command, service and lunar modules with a combined mass of 46.7 metric tons. That gives you an idea of how impractically small 100 tons is for an interstellar flight.

The total cost of a conventional rocket interstellar trip is on the order of $238,596 billion! Even if we said that the costs are over estimated by 1,000x it would still costs $238 billion!

It is so unrealistic that if you search the internet the parties who say such a trip never discuss how much it will cost. The parties who say it cannot be will also point out the mass of fuel required.

I don’t need to say more. Debunked.

The next in this Debunking Series.

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Benjamin T Solomon is the author & principal investigator of the 12-year study into the theoretical & technological feasibility of gravitation modification, titled An Introduction to Gravity Modification, to achieve interstellar travel in our lifetimes. For more information visit iSETI LLC, Interstellar Space Exploration Technology Initiative.

Solomon is inviting all serious participants to his LinkedIn Group Interstellar Travel & Gravity Modification.