I’m flying a hexacopter that carries a partially filled water tank (sprayer use-case). When the tank is half-filled, water sloshing might cause shifting CoG and oscillatory moments, which might lead to instability. I’m looking for any advice to handle this or any setup that I need to do before testing with partially filled water tank. I’m using this tank: https://electrocomps.in/product/buy-10-litre-eft-agriculture-drone-spraying-tank-lowest-at-price/?srsltid=AfmBOopasO-6vgiJd3_9G7eo8PBMgxZetXDSpHiwTRwTmzh3cRDWGXjKd6k
Generally of the drone is big enough it shouldn’t cause issues. If you have issues you would need to put baffles in the tank.
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You could put some explosafe foam in the tank. It takes up about 4% of the total volume and would stop any liquid movement.
You can squeeze it in through the filler cap and it will expand again to fill the tank space.