Hello everyone, I did refer to the commercial aircraft and I like the design of the Eagle R & D framework very sure, simple, aesthetic, a smart design. But I don't find its parameters. Someone who owns Eagle Helicycle R & D can you tell me the size of the frame to be? The diameter of the steel tube is how many mm? And what type of steel used or just normal steel? weight of the frame? A more important thing is the Eagle R & D has a retail parts main tail rotor and main rotor, tranmission,...? I will have to enter a 4-stroke engine from Japan to enjoy lower import tariffs. I will start building as soon as get information! Sorry for my bad English! I would thank everyone for your help! Thiện.