It's been a long time since my last log. Thank you to all the people that liked and followed the project.
Kite design is way more complicated than what I anticipated. There's a lot of ressources on the web and a decent kite usually mean a bigger budget than what I had in mind when I started this project. So I think I'll focus on the balloons for now.
I already know that I'll need multiple balloons but I still haven't determined how I'm going to produce the hydrogen. The first option is to use electrolysis.
Pros : I've done it in the past and there's a lot of documentation on it.
Cons : It's a slow process. It needs a power source so it's not portable. It means that you'll have to produce it at home first, then take it with you and I don't really like the idea of moving around a big quantity of flammable gas. Finally it's kind of power hungry so not a very cheap solution.
Second option is to use a chemical reaction. For example : when iron reacts with hydrochloric acid, hydrogen gas is produced. It's quick if the contact area is big (you can use iron powder for example). It can be done anywhere if you bring the chemicals with you. The chemicals are quite cheap and easilly available. The only problem that I can think of is to find a way to stop the reaction once you've produced enough so that you don't waste chemicals and produce more hydrogen that could cause a fire hazard.
I've already got some ideas on how I'm going to solve this problem so I think I'll go whith the second option. If you can think of any other option please comment !