If interested, here are the details of how to build a high-performance and light weight gimbal for the GoPro.
http://diydrones.com/forum/topics/building-a-3-axis-gimbal-for-gopro
Even though the build is a 3-axis gimbal, for the GoPro I actually recommend only building a 2-axis gimbal:
- tune ship yaw PIDs to keep side to side motion to less than one pixel.
- make yaw on the Tx heavily expo'd so ship yaw movements have gradual accelerations and low velocities
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