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Welcome and thank you for your interest in my Autogyro plans. Scratch building saves you money and my autogyros can be fabricated with ordinary shop tools and local hobby shop materials. My designs have been built and flown world wide. I am excited to see how your model turns out. Please send me pics or videos of your bird! Customer service is something I take pride in, send me your questions and if you are doing a build on a forum, please let me know?  I would be more than happy to check out what you guys are doing!                                      You may be wondering how these crazy machines came about? In the early 1900s, vertical take off and landing was the challenge. If this could be achieved, less land would be needed for airports and runways. Also, please understand that the Autogyro was the precurser to the helicopter. Helicopters have powered rotors that lift the the aircraft into the air. The autogyro is different, the rotors are free spinning. The negative pitch of the rotors push the blades forward and the airfoil of the rotors create lift. As the rotors increases speed due to the aircraft moving down the runway, lift is achieved just as a wing would. Juan De La Cierva was the man who had great success with his autogyro as he created the first hinged rotor system. The hinges allowed the rotors to find their way as they spun. You need to understand that if the rotors were mounted rigid….the spinning rotors would create lift on the fuselage side passing the tail and towards the nose. Blades turning counterclockwise would roll to the left.  Now that you understand that…..another force that will roll the autogyro is having rotors spinning too slow as the aircraft lifts off the ground. I know you have seen model autogyros on Youtube rolling over and crashing. This is usually means the rotors are not spinning fast enough. If you follow the directions on the plans, you will be fine. You can contact me via email. Contact me on RCG “Sofamn NJ” anytime.