I have a few customers making bent tubes, using the bladder method. Although the principle is simple, there are quite some tricks needed to get things right. Some of the problems you might encounter:
-moulds. Your mould split should be exactly halfway the pipe, or it will be stuck in the mould.
Moulds can be made with fiberglass or carbon. The same material as the part is preferred. Make sure there is plenty of lock between the 2 halves, using domes or dowels. Make the mould strong enough to resist some force.
-fiber placement. This is a nasty one. depending on size of the tube you can use a carbon sock, or wovens and UD, placed strategically. Either 2 seperate halves with overlap, or 1 slab of carbon, wrapped around the bladder, forced in place by the bladder.
-bladder end. One end can be a simple knot. The other end should have a connector that connects the bladder with as little leaks as possible. My customers make them theirselves on a lathe.
-epoxy laminating. As such that you will end up with a pinhole free tube, but also without excess resin. I have seen people use drain systems in the mould to get rid of the excess resin.
Airtech has gusseted tube, which can be an advantage.