This build is probably the most difficult one I've ever made, and that is not just because Pwegoable's tutorial was somewhat difficult to follow (sorry Pwegoable). This structure simply looks weird. Take a look at this:
|The silver blocks make up the structure.|
However, this is a very specific build, and a few requirements must be satisfied before the jumps will occur.
1. A multi-cart is required. The multi-cart can be made using my multi-cart station build or Pwogoable's slightly more primitive method of dropping carts onto each other from above. See his tutorial vid for the details.
2. If you are using Pwegoable's double cart making method, a certain amount of spacing is needed between the carts for the launcher to work. See his tutorial vid for details. This spacing is already provided automatically if you use my multi-cart structure. However, with my structure you must be sure not to allow too much spacing or the minecarts will break apart.
3. A relatively long track must lead to the minecart launcher, and that track needs at least one booster. A large amount of momentum is needed for the minecarts to jump, so at least one booster is necessary. The track must be of a good length too. I used a track of about 40 blocks for my prototype.
4. A launcher must be placed at a turn that travels outward one block and one block only. This is the only place where a minecart launcher works.
Here is a grid drawing of the minecart launcher. The launcher has three levels: top, middle, and bottom. The rail is only on the top level.
|Top level. The brown represents the rail track. The silver represents the launcher.|
|The middle level. The brown represents the rail track above and does not need to be added to this level.|
|The bottom. Only one block needs to be placed here.|