Hi Pavlos,
welcome to 152VO and be sure, that writing in english is definitely no problem. Just the opposite. We're glad that we got members from two dozend countries in our club. On our forum you'll find postings written in german, english, french, dutch and maybe some other languages which we even don't know. The coincident connection of professional modelers and absolute beginners, of original raceboat drivers and model drivers, of people all over Europe and some other parts of the world is the main spirit of our club. So we're glad that you found us... don't hesitate to write in english.
One word on the Aquacraft OB: some of us used this outboard some years ago. It's a nice looking engine, but the drawback is that it's not too reliable. The bevel gear is much too weak. The Aquacraft was originally constructed for small brushed motors, but todays brushless motors are way too powerful for the tiny gear-wheels. That's why they break quickly. My suggestion: use an outboard with a flexible shaft. There are a lot of alternatives to the Aquacraft, e.g. the pretty cheap TFL engine. When you change the bearings of the TFL it becomes a reliable engine.