I have been thinking about sending my X-UAV Talon on a 100km flight and despite pondering it for a long time today I hit the milestone in an unplanned way.

During a checkout flight for our spare support aircraft for West Coast UAV's entry in the 2016 Medical Express challenge I noticed that we had an amazingly efficient combination of airframe/motor/prop and the numbers were looking good for a 100km run.

So up the Talon went carrying 20AH of 3S Multistar batteries driving a NTM1100KV motor and APC 12x10 prop. The average speed was kept low and despite encountering some airspeed measurement issues it crossed the 100km mark at just over 1 hour and 40 minutes airborne.

Logfile Link

The landing was unfortunately a bit hairy and fast as the voltage had dropped fairly low and the airframe copped a few dents but really happy to have knocked over the 100km milestone.

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Comment by Jason Franciosa on September 11, 2016 at 12:55pm

ESC Losses are much more difficult to calculate as it will change throughout the switching speed required by the ESC and the quality of FETs used. I don't know how to calculate it accurately as it is quite complex and dependent on many factors, Motors are much simpler.

Comment by Damian on September 11, 2016 at 12:59pm

Ok Jason; I assumed the same resistance. You are right. Lower kV motors have much higher resistance. 

Great I can keep designing my drones on 3S as it is much cheaper .. :)))

Comment by Rob_Lefebvre on September 11, 2016 at 1:22pm

I'm going to throw my support behind Jason on this.  He's got it.  You don't automatically get better efficiency using higher voltage.  Yes, it breaks the internet.  This happens a lot.

Comment by John Arne Birkeland on September 12, 2016 at 1:27am

And if we learned something in the process, it's a win-win. :)


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