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Coobs commented on June 26, 2014
Hi , Is anyone out there in UAV land able to help me. I have a requirement to carry a 20kg payload on an Autonomous UAV with obstacle avoidance capacity. The UAV needs to go to preprogrammed GPS waypoints and hover over each waypoint 2m above ground for 30 seconds then go to th next preprogrammed way point. We have IP that's exists and commercial that we would like to adapt to a UAV with this capacity . We require a lot of UAV units. Regards Steve iS ANYONE OUT THERE ABLE TO HELP
Jim H. commented on May 22, 2014
Lee: There are strong limitations on energy and power implications of what you see in most small drones - the smaller the swept area of the propellers, the higher the power usage for a given ability to move that load. I dabble in simpler ways to explain efficiency to those who design and build small aircraft and it can always be explained by two pressures - the drag area pressure and therefore the terminal velocity and, at right angles, the induced drag pressure (weight over drag area) and supporting pressure (weight over span efficiency times the span squared in fixed-wing aircraft). Sooner or later the folks who do not understand these important concepts will stumble upon the vital need to get slower rotation speed props with larger diameters and a longer range on a given battery size. also, the selection of a motor to be most efficient at it actual loading point is very important indeed - the efficiency of a motor-prop combination has two zeros: at zero total pressure and at zero total flow. The efficiency peaks in between, but falls of very rapidly if the operating point is not close to the max efficiency point. Jim H. White systemsc@xplorn­
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