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    Hidden Flight Controller restrictions/tricks

    What can a proprietary FC hide or do without our knowledge or control? What can they do beyond the following example? DJI blocks flying above Tiananmen Square with software update http://www.dronejournalism.org/blog/dji-blocks-tiananmen "In the release notes for the latest upgrade of its...
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    Why frames are soo expensive?

    I am a newbie and I am surprised by the frame prices? Can you please explain the factors that contribute to the cost?
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    Performance Metrics ?

    How do we measure the performance of a multirotor? What metrics we can use to compare between different designs?
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