I'm designing a copter and trying to decide if the propellers should be ducted or open axial flow. I've read some theory on ducted and open air flow but I can't find any where that compares the two. I would prefer to use ducted over open for safety (ie put a safety guard round the propellers so they can't be run into with fingers etc). So are there any major advantages or considerations I should take into account, with ducted vs open axial flow before ploughing ignorantly ahead with one or the other type of flow?
closed as off-topic by Colin McFaul, DavePhD, Brandon Enright, Kyle Kanos, Kyle Oman Jun 19 '14 at 0:01
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Actually, ducted fan propeller are much less efficient than open blade propeller soif efficiency is your priority, open propeller is your option