Electronics > Projects, Designs, and Technical Stuff

Everything wrong with amateur railguns and how to make them better

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mzzj:

--- Quote from: Honda Rider 271 on December 27, 2019, 08:58:58 am ---

--- Quote from: mzzj on December 27, 2019, 08:54:18 am ---Where the f** did you get this idea from?

--- End quote ---

Is this a nice way of correcting whatever I got wrong but you forgot to include that part? Please be helpful. I am trying to learn.


--- End quote ---
I don’t know where did you get the idea that 10 times lighter projectile would accelerate to 10 times higher speed with same input energy.

Afaik ETG or electrothermal gun has shown most promise of any hobbyist projects:

Numbers are there for someone to calculate muzzle velocity and efficiency..

LukeW:
The railgun is an Australian invention, thanks to J.P. Barber and Richard Marshall at ANU in the early 1970s, where velocities of 5.9 km/s were achieved.

The trick was to use not a capacitor bank, but a large homopolar generator as the pulsed-power source - it used to be the largest homopolar generator in the world.

Interesting reading:

https://repositories.lib.utexas.edu/bitstream/handle/2152/33197/PN_057_Marshall.pdf

https://link.springer.com/chapter/10.1007%2F978-1-4684-1048-8_25

https://sci-hub.tw/10.1109/20.911872

excitedbox:
Nobody is born an expert. You trying to discourage him now might well rob us of our next expert.

Obviously what has been tried before isn´t working. He want´s to try a different approach and I think that is much better than going with the same old stuff that hasn´t worked.

I like the inductor idea but there have also been huge advances in capacitor technology. You can build your own super caps out of activated carbon, foil sheets and an electrolyte.

I would suggest building a device to cover foil strips in a layer of paint made from activated carbon, graphene and glue. Wrap into jellyrolls with tabs for contacts and shove into PVC pipe and top off with some electrolyte solution. The materials are all extremely cheap and you can make them pretty quickly if you build a few tools.

ogden:

--- Quote from: Honda Rider 271 on December 27, 2019, 08:58:58 am ---Many small railguns firing a few grams to kilometers a second have been built in university labs.

--- End quote ---
You mention many railguns built in university labs, yet provide zero pointers. Give at least few.

Marco:
Why are the armatures on the sabots generally at the back? Wouldn't it be much more stable to have them at the front? Pulling the weight instead of pushing it.

I wonder if it would make sense to have the electrode rails in pairs and precharge the air between a pair of rails with plasma (a given pair would be at the same potential during launch, the armature would be between one pair on one side and another pair on the other to make the conductive path). Give the arc which needs to form to the armature a bit of a head start.

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