Hi! I ordered 2 small keychain cameras from Hobbycity and planned to have them on the heli. And to have the big picture a hat cam was used in addition. These cameras cost 15 USD with a 2 gigabyte Micro SD (or Transflash) Sandisk memory card. If you take away the key ring and chain weight ends up similar to price, something around 15 grams. Good feature set. However I faced some issues. You can see following layout on screen: - top-left frame is a keychain camera mounted on tail boom, opposite to tail rotor - top-right frame is a Fuji F480 point and shoot camera on a baseball hat (that is on my head BTW) - bottom-right is second keychain camera mounted inverted on canopy nose, below ESC I received my cameras after some stock refilling at Hobbycity, these were coming from another batch than what reviewers had in first place. My cameras do not adjust sound level according to noise level. And they have issues to provide fluid picture. As you can see the footage has framedrops every 3-4 seconds. I suspect that the memory card cannot write as quickly as needed, so some frames are actually missed. There are some other issues worth addressing. These small cameras cannot really handle if a propeller or rotor is in the frame. Video compression gets crazy of rotating high-speed objects. The image gets wavy in this case. The other nemesis of video compression is vibration. You get plenty of that on a heli. I am not really sure how to dampen vibration, the heli is quite well balanced ...
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