Now that's an interesting idea. However, I suspect that we would have to more than double the time in order to make it an effective incentive. Has anyone built an actual, flying, chinook style, rubber powered helicopter? I've seen a couple at competitions, but they didn't fly particularly well.
If the National SciOly organization wants to encourage experimentation in the Helicopters event, try a bonus of doubling the flight time of a tandem rotor helicopter, i.e. one that has a pair of separate rotors that spin about different axes spaced apart at least the max allowed rotor dimension. Imagaine the challenges in building and trimming a balsa wood stick version of the Chinook helicopter.
Maybe Jeff can expand more on this, but I don't think there would be any benefit to doing this in a model-based scenario like SO (I could be 100% wrong there though, since I don't think it's ever really been done). In full-scale applications, dual rotors allow for much greater lifting capacity (effectively double that of a single rotor) and also don't require a yaw-adjusting tail rotor to keep from spiraling out of control.The weight will be Very hard to achieve in my opinion, however it does seem kinda interesting (like a pusher Wright Stuff). Maybe I'll build one after States is over. Can Jeff, or anyone with knowledge of aeronautics explain the advantages of using a tandem design?
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