I have studied aerodinamics and I`m aware of all those things. I saw a RC SV-51 that can fly and I realy think that my proyect can be made to. If you would show the blue prints of any modern aircraft to Bristol or any of those designers, they would think the same as you. In other hand, there are in the market a lot of turbine engines for model airplanes that can give 15 kg of thrust, and I`m planning to use two of these. Besides, with all the robotics and material tecnology that we have now a days I think I`s very posible. dreams cost nothing,