Your Longest Litchi Mission with a Phantom 3 Standard ?

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I've been flying Litchi missions for a couple of months now, and have logged over 300 miles cumulatively. Most of the missions are long enough to assure signal loss shortly after departure, but with each successful return to base, my confidence has grown, and thus far 30% charge capacity is about the average remaining battery power left by the time the drone returns.

The technical performance spec sheet of the Phantom 3 Standard shows 25 minutes of flight time as the maximum battery duration possible. I note, however, that Litchi tends to estimate flight time of its Mission Hub flight plans as being on average 5 minutes LONGER than the actual time taken for the drone to run the entire course at its nominal cruise speed of 17.9 miles per hour. Due to my being aware that a flight slated to take 25 minutes, generally ends at the 20 minute mark, I have been gradually pushing the envelope, by programming incrementally longer flight times, with my longest thus far being a 5.4 mile round trip that was estimated to take 24 minutes in the Litchi Mission Hub, but which actually saw the P3S returning to base at the 20 minute mark, with 35% battery capacity remaining.

Like a 'Vegas gambler that doesn't know when to stop, I have now created a couple of flight plans that are 5.8 miles long, round trip, with an estimated flight time of 26 minutes. As I mull over whether or not to roll the dice and launch one of these ambitious missions, I thought there'd be no harm asking fellow P3S pilots how long they have dared program Litchi missions, bearing in mind the generous overestimation of flight time that the Litchi Mission Hub applies to each flight plan. My guess is that very few P3S pilots will ever dare attempt a 6 mile round-trip Litchi mission at cruise speeds, and I suspect that a 5.8 mile round trip, even in calm winds, is most likely the absolute limit of the distance attainable with a P3S flying under Litchi control.

So, let's hear your record trip distances and durations, fellow gamblers, and if anyone actually lost their drone while going for a distance record, I am all ears, and ready to learn from those fatal errors.
 
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If you're familiar with @DirtyBird , he's the expert for Litchi flights with P3S IMO. He's done some phenomenal flights around Baltimore with incredible flight accuracy and distance. You can check out some of his flights here.
 
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Hello John. Oh yes I am very familiar with Dirty Bird's astonishing video clips. It was after reading about his preference for the P3S as a Litchi platform, that I realized what a treasure the lowly P3S is, for anyone interested in taking long range flights.

The footage of those drones in aerial procession across cityscapes by day and night, is just mesmerizing to watch, and the accompanying soundtrack heightens the cinematic grandeur of Dirty Bird's exploits. To say I was inspired by those ultra long range missions, would be an understatement. That man is a renegade for sure ha ha.

Prior to the start of my Litchi adventures, signal loss during a flight, was disappointing. Now, I hear that that Litchi announcement "Warning - Disconnected", with a sense of eager anticipation about the footage my drone is capturing while on auto-pilot, well beyond signal reach.

One thing I quickly learned in Litchi, is to review all waypoint altitude settings very carefully, so as to clear trees that may loom taller than they appear in the Mission Hub satellite imagery. Twice while reviewing footage, I watched as the drone skimmed way too close to treetops, so I quickly went back to the Mission Hub and added twenty feet to the altitude at those locations, for a more generous margin of error.
 
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If you're flying that low in your program, be careful you always take off from the same place for the mission you plan. The heights are ONLY relevant to your launch site elevation. The flight altitudes would vary if you chose a different elevation to launch from, such as down in a valley lower than the original flight launch spot. Also keep in mind that barometer measurements from the craft can have an error of up to 50ft altitude (extreme case), and often have errors of 25'. I'm sure you know all these caveats by now, I only mention it for others reading.
 
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This caution about barometric errors probably saved my drone from disaster, John, and I thank you kindly for bringing that error margin to my attention. I did suspect that the altitude of the Phantom 3 Standard was off, particularly when I flew it over a river valley, and noticed the forest was further below the flight path than I had programmed, but I put that anomaly down to the online mapping feature's topography inaccuracies, and not to the craft itself. Now I know better, and will avoid cutting it too close henceforth.
Bandit Inbound.jpg.jpg
 
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I just successfully completed my longest Litchi Mission thus far. Started out with 98% battery, and the flight time for this 5.8 mile round trip was estimated by the Litchi Mission Hub, at 26 minutes. The altitude ranged from 150 feet over the forest, and climbed to 246 feet over the town, so I could scan for cellphone towers, and mark them on the Mission Hub map.

The drone soared back into view at the 22-minute mark, and when I landed it, the battery level stood at 22%, with the battery icon colored an ominous red, while the Litchi lady's voice prompts issued one dire battery warning after another. The recorded 2.7K footage took up 3.85 GB on the memory card, and there were no close calls to speak of during the entire flight.

Looking at the 22% battery level on landing after this 22- minute flight, I decided to ensure that all future flights do not exceed this 5.8 mile distance, on calm days like today, and no more than 5.6 miles if there is any appreciable wind blowing in the area. All in all it was a successful test, and my next flight along this course will be at a lower altitude, now that I have mapped out the pair of cellphone masts that lurk along the route.
 
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