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A working model of a electromagnetic mass accelerator of high power

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V2006

Fri Sept 29 2017, 12:02AM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
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Posts: 86

In the video the operation of the prototype of a electromagnetic mass accelerator (mobile test stand).

1506643242 61550 FT0 Img 20170727 155617

Demonstration of a working model of electromagnetic mass accelerator - a mobile test stand (side view).

kerver

Wed Nov 08 2017, 08:04PM

Registered Member #522 Joined: Thu Feb 15 2007, 01:04AM
Location: The Netherlands
Posts: 33

Wauw man.
Pleasu tell us about your working en the electronics setup of your high power super gun?
Thanks you.

With love, from Amsterdam, The Netherlands. Greets to you all...

V2006

Wed Nov 08 2017, 09:26PM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
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Posts: 86

Dear colleagues!
The diameter of the accelerated object is 21-22 mm; weight of the accelerated object from 370 to 480 g; stored energy 10300 J: 5 pcs 450 V x 8200 mkF (EPCOS) + 2 pcs 450 V x 10,000 mkF (HITANO) + 3 pcs 450 V x 1500 mkF + 54 pcs 450 V x 680 mkF + special design

V2006

Fri Jun 15 2018, 07:24PM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
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Posts: 86

The effect of an electromagnetic mass accelerator on a complex target

The effect of an electromagnetic mass accelerator on a complex target
- side view

Now also available playlist

V2006

Thu Jul 12 2018, 09:19PM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
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Posts: 86

The current model of heavy-duty electromagnetic mass accelerator (working model of the coilgun) - increase in efficiency:

V2006

Thu Nov 01 2018, 09:08PM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

New!

Zuckerstange47

Sat Nov 03 2018, 12:07AM

Registered Member #61926 Joined: Wed Nov 22 2017, 04:08PM
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Posts: 34

Your links don't work, probably because you were in editing-mode when copying the adresses!?

It is hard for me to understand the video, like what components (coil parameters, number of coils, switches, controlling electronics...) did you use in your accelerator? Do you build completely new designs in every experiment, or do you improve it step by step? Have you measured the speed and energy of the projectile?
The result looks very impressive!

V2006

Tue Nov 06 2018, 10:17AM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

Thanks for rating.
The speed is supposedly about 90 meters per second. The kinetic energy exceeds 1600 joules (for a large model, the capacitors are 10,000 joules at 450 volts).
And about 50 meters per second (kinetic energy of more than 600 joules) in a compact model with 100-volt capacitors with a total energy of 2027 joules.
This 450 volt design is 10,000 joules - the coil is improved.
And the design development with a voltage of 100 volts 1727 joules is optimized for the coil, core and 300 joule capacitors.

DerAlbi

Wed Dec 05 2018, 11:50PM

Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727

Ok, so i had email contact to V2006 and i think it is time to debunk his build. He is posting his videos in virtually any thread relating to coilguns in order to get recognized.
He does not want to describe his build openly, so i wont do either. I helped him simulate his setup to understand his optimization, so i got the build details (which i wont share without his consent).

A summary of what he claims he has done and is known public:
- he built several coil guns with very high mass and a massive projectile and a massive capacitor bank. The coilguns share parts. Such builds have a huge potential to have an extreme kinetic energy output.
- his projectile is between 380g to 450g (which is open information). He claims very high speeds and very high energy like 50m/s or 90m/s depending on which capacitor bank is used and which projectile is shot. He also claimed 200m/s once.
- He does not say if the design is SCR, resonant or halfbridge. But in an other thread he described is tuning strategy.. via projectile weight, initial position and capacitor bank size and initial voltage If you like to guess which of the 3 topologies is, consider: he uses a light bulb as capacitor charge resistor (seen in videos) - does he have the technology to drive IGBTs? He uses electrolytics (clearly) - can this be a resonant topology (from Yandersen)? Does his tuning strategy sound similar to how you optimize the SCR design? Would the tuning procedure apply to a halfbridge design too? You judge.
- recently he showed a lot of frustration with the world - mainly with anyone who is driving the world forward. This idea comes from a perceived superiority from having built the most powerful coilgun.
- if any of this posts uses offensive formulation: he uses a translator. I dont think the actually can write english. I found it usefull to write my texts in google translator and see if the translator conveys the intended text content.

But has he actually a special gun? No.
- He sent his design to a Israeli university: they simulated his setup and got ~40m/s output from the 10kJ capacitor bank (where he claims 1.6kJ output energy)
- He gave me his design, i simulated and I got 32m/s.
- Those are agreeing results considering me using 480g as projectile weight while Israel could have used 380g. No matter.. the energy transfer is like 235J.
- This is off by a factor of 8 to his claims. TWO independent simulations cant be that agreeing and be wrong at the same time.

Now, first i was challenged by the result and questioned how he measures the projectile velocity. I asked him to shoot at a barrel at exactly 10m distance to analyze the audio track of the video.
He did not do it, but gave me this video instead and claims this is a 10-12m shot.

I analyzed the audio and it takes 313ms between the shot and the impact. I do not believe that it is a 10m shot - i dont think 2 medium cars would fit in this distance. Also, after he goes around his car, i counted like 12 steps in high grass to reach the target. Expecting 60cm per step, this equates to 7.2m distance. (might be less than 60cm but might also be more steps. the camera does not show)
Now at 7.2m, the sound of the impact at 340m/s speed of sound takes 21ms. So i calculate the velocity to be 24.6m/s. [35m/s if its 10m distance; 43m/s if it is 12m distance taking speed of sound into account]. Interestingly the audio analysis does match the simulation result!

Now V2006 in his own way of course, hates math and every engineer and scientist - because they are all wrong and never reach usefull results - i am the best example, agreeing with bad simulation results, even in face of hard evidence.
His experience in shooting guns, crossbows and stuff makes him believe that the observed recoil/kickback must come from an enormous projectile energy which is even more evidenced by the fact that his heavy coilgun jumps a few cm back when it shoots.
V2006 does not understand that kickback is purely dependent on conservation of impulse and not determined by projectile energy:
My gun at 40m/s and 20J has the same kickback as a 9mm gun when shooting because Impulse = ProjMass*Velocity is nearly equal, while kinetic energy (m/s*v^2) is vastly different.

So because of the experiences recoil/kickback he is convinced that he reaches massive amounts of kinetic energy (like a shotgun) and feels that his coilgun is extremely special. Yet his design is like any other design: 235J out of 10kJ is just 2% efficiency. His lack of recognition to his fake result makes him even more desperate.

The more you know.

V2006

Thu Dec 06 2018, 07:49AM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

I will prepare and publish a refutation in the near future.

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