How long still?

Project Kingfisher is about building a plane which is able to fly and dive into water and fly out of it again - just like the bird can. If possible, it should also be able to film it’s flight/dive.
To start, I am learning how to use a radio controlled plane. I thought it would be the easy part but actually it’s pretty difficult so I looked around and found somebody willing to teach me the basics. I’ll have my first lessons in a week.
Also I’m reading books about RC-Planes and how to construct them right now to get some background knowledge. Once I have sufficient information about planes and how they are built, I’ll dive into the matter of Submarines. I’ll have to learn how they are built, how they function and how they are commandet.
To gain experience with planes I bought five different ones. One is still waiting for repairings, two are completely destroyed and two are not yet assembled. All but one plane were for beginners so you can imagine how much more time it will take me to become an o.k. pilot and I assume it will not be much quicker to become an ok captain.
For the Planes I know now that there are several clubs around who also support you in training, insurance and who offer you an airfield. For the subs I have no Idea so far but I think these informations will come up as soon as I start looking.

For now I have tons of Ideas in my head. About how to cool an engine that is closed in an waterproof capsule while running as fast as a plane engine has to run. About the different propellers needed in the air and underwater. About how to change the weight of the kingfisher when it dives into water and about how to get rid of this added weight once it comes out of the water. About which and how many engines to use and about the force and size of the servos.
The longer I look into the different categories of the RC-World, the more I see and the more solutions I find. It’s a fascinating world filled with tons of things I still have to learn.
Project Kingfisher will - at the pace that I’ve taken so far - be finished not before the next two years.