"That is a weapon, NOT a teleporter" - Samuel "Whyamieventrying" Hayden
The concept is fairly simple. You have a crazy, but crazy talented kobold inventor with lots of spare time and junk. This kobold really wanted to get into a science festival. Unfortunately, the event is hosted by humans and in this world, humans don't really like kobolds, or demi-humans, or...
Anyway, the kobold decided to take revenge and get into the festival Aaand dominate it by launching himself over the audience's heads (some parts of the festival are held outdoors) and safely descending into the crowd with a parachute.
So, the invention, he intends to launch himself with, is the Kobold Cannon. The KC is a
mobile portable coilgun of the kobold's own design. The cannon and the power source have to be carried separately and assembled on-site.
The primary purpose of this cannon is to safely launch fragile and even perishable cargo over long distances. It could revolutionize toilet paper delivery and bypass the defenses of Győrfi Pál (last time I checked he wasn't able to fly, I swear!) if it worked correctly.
Obviously, the kobold has to use a multi-stage coilgun, as a railgun would zap him out of existence.
He also has to find a lightweight, magnetizable carrier and a lightweight carrier (weight!=density) projectile,
come up with a way to discard the magnetic carrier once its payload exits the cannon,
and have the parachute open automatically when near the target.
Not to mention, it's important to minimalize the drag of the carrier projectile.
The power source is given, graphene supercapacitors, a diesel generator and lots of patience. What I'm having trouble with is the structure and composition of the carrier projectile. How could it work reliably and as efficiently (minimal weight and drag) as possible?
While I assume the kobold can build just about anything, simpler mechanisms are, of course, better.
When it comes to range, I didn't really have any concrete numbers only an "as far as it can travel". I think if the cannon can deliver cargo to a point, 1-2 kilometers away. That's sufficient.
As far as cargo weight comes, 50 kg should be the maximum, the cannon could safely launch.