the rotors. The normal power path was directly from the engine into a speed-reduction gearbox and into the rotor without any vulnerable shafts involved. A driveshaft remained in the wings for emergency use to transfer power to the opposite rotor in case of a single engine failure, but that shaft did not normally carry any power loads, making it lighter. Colonel Burnett picked me to fly the aircraft perhaps because I had test flight
1. INTRODUCTION. Nowadays, social scientist and engineers, as well as the architects put a lot of attention and take a lot of care about, not only housing, but also tertiary buildings like museums, hotels, restaurants, office buildings, etc. But fortunately we live in a time where electronic and electric engineering is present in all sides and is making a deep impact in all society, for this fact engineers of XXI century have a great knowledge, skills, information and technology for making