Fayme Chandonnet Quadcopter June 11th, 2018 - 19:37:31
If the Kv of the motors is too low you may need to increase the number of series cells in your battery pack. That is what happened in my saucer quadcopter. Three cells in series were not enough to provide the power I wanted. When I switched to a 4S battery pack it came alive. This is also a highly demanding application with constant high current flows. I needed a quality battery with at least a 30C rating. If you lose power while flying a quadrotor you are dead. It is not like an airplane where you can glide to a safe landing. With a quad you need to keep a close watch on the flying time and land long before the battery runs out. Dont try and beat a flying duration record! A low battery on-board alarm might be a wise investment too.
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Now then for the outer assembly - more safety is garnered by outer bearings but reduced friction is the key thus electromagnetic system makes sense but due to weight perhaps not 100% magnetic. This article explains the concept of Thrust Bearings and the combinations I propose we employ. "Design Fabrication and Performance of Foil Gas Thrust Bearings for Microturbomachinery Applications" by Brian Dykas Robert Bruckner Christopher DellaCorte Brian Edmonds and Joseph Prahl. (NASA/TM-2008-215062 January 2008; GT2008-50377). Currently we know that the quadcopter design is probably one of the most stable designs yet but most quadcopters are only toys small drones and have a limited payload. If we want these types of designs to fly around people heavy weight or become our future flying cars and air taxis commuter shuttles well need near 100% safety that means current rotorcraft components may not be viable. Please think about the future maybe you can have a flying car after all?
A good rule of thumb is to use speed controls that can handle one and a half times the current needed to maintain a hover. My two pound (1 kg) quad needs 150 watts to hover which is approximately 40 watts per motor. With three cells in series in the battery this is less than four amps per speed control (there is one per motor). I originally chose a 25 amp ESC because I was afraid of overloading it. In the future I would use a 10 to 15 amp ESC for a quad like that. I used a 10x4.7 propeller for a simple reason. It is very common and lots of other quadcopters use it. It is also easy to find in reverse rotation versions. A larger-diameter low-pitch propeller is a good choice for a quad.