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CAN A DRONE CARRY A FULL-GROWN HUMAN IN A HAMMOCK?

Sunday, September 10, 2017

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<a href="http://ift.tt/2j3aBgv"> </a><a href="http://ift.tt/2j3aBgv">Wired</a> dives into the science and physics of drones to figure out this age old question. The short answer is yes, with enough rotor area a “drone” can generate enough force. For a standard drone size the power requirements to generate enough lift are too great. Please do not attempt. <blockquote>Let’s focus on the rotor-based drones, though. Their key to lift is their rotors’ thrust: A rotor’s main job is to take air from above the aircraft and push it down at some speed. Let’s imagine that in some short time interval, the rotor takes a cylinder of air above (that was initially at rest) and gives it some final velocity moving down.</blockquote><a href="http://ift.tt/2j3aBgv"><img alt="Spring 2017 sketches key" border="0" class="img-responsive" height="187" src="https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vuRdEz5J5fsae-pf831XanOi-LsaJFKhete3H4tC_11fORUVN8RXlJiqxbBtCTUEsPEOORcOh6qQ=s0-d" style="display:block; margin-left:auto; margin-right:auto;" title="spring_2017_sketches_key.jpg" width="265"></a><blockquote>In the end, the total rotor area is very important. For a given drone weight, you could either make a larger rotor (or more rotors) and push the air down at a slow speed, or you could make a small rotor and push the air down at a fast speed.</blockquote><blockquote>The air starts from rest above the rotors but then has kinetic energy below. This energy depends on the mass and the velocity of the air.</blockquote><a href="http://ift.tt/2j3aBgv"><img alt="La te xi t 1" border="0" class="img-responsive" height="140" src="https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_scjyGzBEfREVQ07Sxi8pafh4IqORXzX30lM99LgPOR5B9NmYv8YIN6RbELVWBb_fakagZKJ41lJw=s0-d" style="display:block; margin-left:auto; margin-right:auto;" title="la_te_xi_t_1.jpg" width="248"></a><blockquote>Theoretically, a drone could lift any amount no matter what size rotor it has. But on a practical level, there are two limitations. First, the maximum air speed is probably around 40 m/s (based on my calculations for the physics of the S.H.I.E.L.D. Helicarrier). Second, if the drone had a power of something crazy like 1,000 Watts, it wouldn’t be able to fly very long.</blockquote><blockquote>I get a rotor radius of 0.188 meters for a total rotor area (6 rotors) of 0.67 m2. Assuming a total drone plus human mass of 70 kg I can first calculate the required thrust speed in order to hover. With these values I get 43 m/s—that seems plausible. Now for the power, I get 14.8 kilowatts (you can see my calculations here. A power of 14.8 kilowatts is sort of crazy high. A normal-sized house could probably get by with less than 3 kilowatts. Just saying.</blockquote><iframe width="532" height="299" src="https://www.youtube.com/embed/RdwMkC0egNs" frameborder="0" allowfullscreen="">

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CAN A DRONE CARRY A FULL-GROWN HUMAN IN A HAMMOCK?

Reviewed by 0x000216 on Sunday, September 10, 2017 Rating: 5

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CAN A DRONE CARRY A FULL-GROWN HUMAN IN A HAMMOCK?

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