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Bamboo copter Flying Ripcord Launcher . Flying Lego Version 2 - bamboo dragonfly - Chinese top - bamboo copter - taketombo - zhuqingting - . This is a version of Anna Vuurzoon's Flying Lego [1] , also known as a Bamboo copter - bamboo dragonfly - Chinese top [2]. I was very impressed with her design so I had to test out a version of it on my own. This is the end result. My ripcord launcher is more basic but functions in a similar manner. Like the Vuurzoon Launcher, my launcher is using an 8 teeth gear but I've raised the launch platform to accomodate my larger hand - my parts are more common place than hers. I found that the Technic three blade liftarm rotor was essential to this design (part 44374) because it had the ability to hold onto the propellers despite the centrifugal forces acting on it. I found that the propeller assembly could work with just one(1) three-blade-liftarm-rotor instead of two(2) that was used in the original design but that the(1) liftarm rotor arrangement wasn't as strong/robust as the original two(2) liftarm rotor arrangement. The Technic three blade liftarm rotor is a semi-rare piece so its a bit harder to find. My version of the original propeller is white because I got them from a Ninjago Ice Dragon (2260). I also created a second flying propeller using the windmill blades from my Lego Education Renewable Energy Add-on kit (9688). The windmill blades already had a deflection angle so to get the same angle of the original propeller I used angle "4" for the Windmill blades instead of original angle "3" connectors that were used on the original propellers. The windmill blade propeller has more surface area and thus it had better lift and flew higher than the original propeller design using the same energy. While I had to tug at the ripcord pretty vigoriously - both flew rather nicely. Gearing up(1:8) the launcher introduce too much torque and made it even harder to get the propellers to fly so I agree with Vuurzoon that a single 8 tooth gear was really the best solution. The launcher access port for the ripcord is not a tight fit so attempting to pull out the ripcord too fast or too hard (against the gearing) caused my ripcord to fall apart (I was using some old legos which I suspect had less clutching power. I might be able to fix this by using all new lego pieces OR by using some glue). I am very impressed with this design. If I had to do this over again I would focus on improving the overall strength of the ripcord so it would be more reliable and be capable of transferring higher/faster initial velocities. [1] http://www.mocpages.com/moc.php/288875 [2] http://en.wikipedia.org/wiki/Bamboo-copter


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