Camera sled for shallow water
A ballasted frame that holds an action camera steady and the right way up when you lower it down the pot line or the mooring.
The problem
A camera on a string spins, films the surface half the time and lands in the silt. You are left with five usable seconds of the thing you actually wanted to look at.
The fix
The sled carries the camera in its own waterproof housing. I do not print pressure housings. A printed wall is not sealed in that sense, and a battery in salt water is not worth the experiment. The frame has a ballast pocket for ordinary lead weights and hangs from a bridle set slightly ahead of the centre of gravity, so it goes down nose a little low. A small tail at the back stops it spinning in current.
It is designed to flood on purpose. Everything is drilled through for drainage, so no air pockets are left to change the trim on the way down and blow out on the way up. The material is PETG, which sinks on its own. The test is the one used at work: put it down, watch the picture, move the ballast and the bridle, and repeat until it hangs still at fifteen metres.
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