First make a 3 by 3 square!
Make a hole in the middle of it, make the hole go 2 blocks down. Place your first Sticky Piston facing upward.
Then take your one Slime Block on top of the Sticky Piston.
Then dig one block down on all sides except for the corners.
Now take your Repeater and place it this way on the side. When you place it on the left side it still means you go straight. After you place it down, bring your Repeater to 2 ticks (Right click once).
Then go behind your Repeater and dig 2 blocks down and 2 blocks wide like this.^^Next after you dig, place down your 2 Redstone. Thy should connect to the Repeater.
Go to the left of the blocks that you just destroyed and deleted those three blocks. In the 3 block space put your Sticky Piston and top and then put your Redstone block under. Then nothing else.
Cover that space up with block of choice but leave the Repeater open and the other open spaces too.
Fill the 4 spaces with Obsidian.
Then go to the front of it place block of your choice on the sides like this ^^
Next take your 2 tripwire hooks and place them on the inside of the blocks of your choice.
Get your string and connect to the tripwire hooks. You can kind of see the string in this picture, its there.
Then start digging the hole out as long as you want. I have mine 1 block downwards.
The hole should look something like this.
Start filling that hole with water.
Then go around to the back and place the block of your choice 5 blocks wide.
Make it 4 blocks up too.
Then go 2 blocks away from the wall and start making another hole that you can land in.
This is what it should look like.
Fill this hole with water also.
Then place your boat down and go forward...
When you hit the trip wire it makes the Slime Block push your boat up into the air!! You are flying!!
You can even make it fancy looking! Hope you enjoy flying through the air! :)