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# Tethering a Quadcopter for Longer Flight Times

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Absolutely dumbfounding
3/13/2014 3:39:20 PM
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This video is absolutely dumbfounding to me.

For some reason this video is posted all over the internet, in some places with a 10 minute introduction where the "experimenters" spew forth all their supposed "credentials".

In the end, they simply proved that yes, you can plug an ac adaptor into a battery powered device, and the ac adaptor will last longer than the battery.  What an EARTH SHATTERING revelation!

Amazingly, all their "credentials" failed to help them realize what an 8th grade hobbyist realizes.... a device with a larger battery needs a larger ac adaptor....and that there is current loss through cables (head plant!).  I half-expect them to try to start their automobile with a 9v transistor battery next!

Then, they went on to proudly display their "achievements" (and lack of basic knowledge) by posting this all over the internet...  LoL.

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How to make it work the first time, or close to the first time.
9/24/2013 4:53:11 PM
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In odreder to make it fly with remote power you need to have the cable light enough so that it can be lifted, and you also need to be able to supply enough voltage at the required currentm draw. So you must find out the current draw at the required voltage. And you must determine the amount of lifting force available. If the cable is going to be so small that it has a big amount of voltage drop, then the power supply must deliver enough voltage to compensate for that voltage drop, and it must have enough currnt capacity to supply the needed voltage while delivering that current. Besides that, the weight of the selected cable must be less than the available lifting force.

Calculating or measuring these three things will allow a reasonable chance of a first-time success. Starting to try without knowing those three things is just an excercise in wasting time and effort. You might possibly be lucky and find something that works, but probably not. Which your first few attempts showed.

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Re: IR Drop
9/20/2013 8:38:18 PM
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I would say that a week is not enough time to do much and they at least got something accomplished.  If I were to revisit that effort I would have suggested building a larger quad-copter with greater lift and larger battery options.  The tether is a great starter for debug but not a real long term solution, the full benefits of a copter can only be realized un-tethered.

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Re: IR Drop
9/20/2013 8:37:32 PM
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I would say that a week is not enough time to do much and they at least got something accomplished.  If I were to revisit that effort I would have suggested building a larger quad-copter with greater lift and larger battery options.  The tether is a great starter for debug but not a real long term solution, the full benefits of a copter can only be realized un-tethered.

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Re: IR Drop
9/20/2013 8:50:45 AM
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that's a pretty good idea!

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Re: IR Drop
9/20/2013 8:49:56 AM
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that's a pretty good idea!

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Re: IR Drop
9/20/2013 8:47:17 AM
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yeah, one week is hardly enough time to recognize the issue and come up with a prototype, much less refine it.

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Re: IR Drop
9/19/2013 11:01:46 PM
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I agree with running a local regulator and feeding higher voltage. You could also run much thinner wire and the flight dynamics will respond closer to the final untethered version.

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Re: IR Drop
9/19/2013 9:33:25 PM
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Another option would have been to supply a higher than needed voltage and provide on board voltage regulation.  This would avoid the 4 wire remote sensing and still enable full votage/current at the copter.

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Re: IR Drop
9/19/2013 8:29:12 PM
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We actually discussed having a supply change its voltage to accommodate the large drop depending on the current. While it should work, Tara and Sean had limited time during their hacker-in-residence stay.

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