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[SkyNinja]

@SkyNinja. maybe you explained it and I didn't understand, what is your fighting a headwind on your return trip.
it seems like your issue started right after your turn around and continued the rest the way back. i'm just trying to find out if that's from fighting the wind with two externals on

I had a light cross wind, with gusts 1 to 3mph. I stayed under 50 feet off the water until my battery drops below 41% then I increase my altitude to about 95ft. I noticed in my previous testing flys with a single Protek 3600 i got 8mins fly time from 100%-80% battery and only about 4.5mins 20% to 2%

 

[SkyNinja]

Yeah I think I’m going to start from the back of the parking lot[emoji38]

 

[beanbubba]

Don't go by percentage. Instead you should display the voltage. New batteries have a very conservative calibration. At 0 percent you can fly for a another 1 - 2 minutes if the voltage is high enough. Once you get under 3.4V the critically low battery autolanding kicks in. On older batteries you'll see that the 3.4V limit might be reached at some higher percentage like 5% while on a new battery you can fly at 0 percent for a good amount of time. Percentage is misleading. Voltage is what you care about.

hey cybernate, I am down 2x 4.0 LiHv's. What happens if I run with 1x 5.2 plus 1x 3.0?

 

[CyberNate]

hey cybernate, I am down 2x 4.0 LiHv's. What happens if I run with 1x 5.2 plus 1x 3.0?

That works just fine. Should be similar weight.

 

[beanbubba]

That works just fine. Should be similar weight.

OK, I was curious if the mismatched battery capacities has any part of the equation.

 

[Phxbird57]

Will they explode?? I can test that right now!!

Get pictures.......

 

[MacIak]

OK, I was curious if the mismatched battery capacities has any part of the equation.

Exactly my thoughts too. Wanna try 5200/3000 and 3000/4000 lihv combo. Wondering how the cells measure after flight.
Regarding your forced landing: when i lost creep in the drink the same happened. Sudden big drop in battery voltage. Also was using an abused main pack resulted in forced landing.
You have some weird rats around there btw. Sure they rats?

 

[dirtybum]

ive used different mah combos plenty. Even like a 10,000/ 2,000 or a 8.0 & 4.0, there's no harm, they burn down evenly

 

[mavicpro1000]

Its kind of fascinating how different capacity packs can burn down evenly. Can anyone explain how?

 

[CyberNate]

Crashed my new stock Mavic today REALLY hard on concrete trying to reach 30K out and back stock. Too much head wind coming back and came up 306ft short of making back after going 29,180ft out. Flight time of 23:00 going 31.6mph out and 26-27mph back into headwind. I charged this battery a couple days ago. Should have charged it this morning before flight. Probably would have made it. It's a cooler day than usual as well, so that's not helping. Was amazing that it was still flying at around 2.5V per cell. Was so close I had to go for it.

Now I have broken camera sensor, broken processor board (probably), battery casing trashed, and who knows what else. Won't even start. The DJI boot sound gets cut off and Mavic never finishes initialization. Flying over a parking lot is not a good idea when you're at 0 percent battery. Fortunately no cars hit. I'll get it fixed up. I'm pretty much a ninja with fixing stuff on the Mavic these days.

 

[CyberNate]

Its kind of fascinating how different capacity packs can burn down evenly. Can anyone explain how?

Because it is voltage not current that remains the same across the parallel packs. The larger packs will simply flow more current than the smaller packs. The voltage drops evenly across the packs after taking internal resistance into account.

 

[dirtybum]

Wow, 3 downed birds by 3 different members in 3 days!! this is getting really interesting, (or real discouraging)

 

[lolo780]

Crashed my new stock Mavic today REALLY hard on concrete trying to reach 30K out and back stock. Too much head wind coming back and came up 306ft short of making back after going 29,180ft out. Flight time of 23:00 going 31.6mph out and 26-27mph back into headwind. I charged this battery a couple days ago. Should have charged it this morning before flight. Probably would have made it. It's a cooler day than usual as well, so that's not helping. Was amazing that it was still flying at around 2.5V per cell. Was so close I had to go for it.

Now I have broken camera sensor, broken processor board (probably), battery casing trashed, and who knows what else. Won't even start. The DJI boot sound gets cut off and Mavic never finishes initialization. Flying over a parking lot is not a good idea when you're at 0 percent battery. Fortunately no cars hit. I'll get it fixed up. I'm pretty much a ninja with fixing stuff on the Mavic these days.

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**** 306ft is so close. Are you able to pull the internal data?

 

[CyberNate]

**** 306ft is so close. Are you able to pull the internal data?

I will probably have to pull the SD card out from the board, but can try connecting to laptop. You never know.

 

[CyberNate]

Wow, 3 downed birds by 3 different members in 3 days!! this is getting really interesting, (or real discouraging)

It's my own fault. The thing was flying rock solid even at 3.0V (0 percent) in critical autolanding . I simply went for it and can't expect more out of the Mavic. If I was flying at a proper location over grass, I would have been fine bringing it down low. Instead I have to go over a hill, trees, buidings, etc. My own fault.

 

[lolo780]

I will probably have to pull the SD card out from the board, but can try connecting to laptop. You never know.

Flip the WiFi switch on and see if the ID pops up. Reseat all the ribbon cables. Also check the bottom of the ESC board near the #2 motor where the components are placed close to the plastic standoff.

Looks like this board got physically damaged in that area. Motor #2 not working.

 

[Phxbird57]

Crashed my new stock Mavic today REALLY hard on concrete trying to reach 30K out and back stock. Too much head wind coming back and came up 306ft short of making back after going 29,180ft out. Flight time of 23:00 going 31.6mph out and 26-27mph back into headwind. I charged this battery a couple days ago. Should have charged it this morning before flight. Probably would have made it. It's a cooler day than usual as well, so that's not helping. Was amazing that it was still flying at around 2.5V per cell. Was so close I had to go for it.

Now I have broken camera sensor, broken processor board (probably), battery casing trashed, and who knows what else. Won't even start. The DJI boot sound gets cut off and Mavic never finishes initialization. Flying over a parking lot is not a good idea when you're at 0 percent battery. Fortunately no cars hit. I'll get it fixed up. I'm pretty much a ninja with fixing stuff on the Mavic these days.

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I'm happy & sad. great distances for stock BUT sad you lost another one.

 

[CyberNate]

I'm happy & sad. great distances for stock BUT sad you lost another one.

Part of the game. I was being reckless running battery down so low. I'll get it fixed up.

 

[beanbubba]

Part of the game. I was being reckless running battery down so low. I'll get it fixed up.

hey cybernate, can you step us through what happens once you hit 3.4 volts down to 2.5 volts (or crash) and how you react? Got a lot of new folks and there are 200+ pages of articles to read to find this stuff.

 

[beanbubba]

I know exactly how it feels, water is always hungry for another mavic. If i lived near some coast id lose one on a weekly basis and still keep goin'.
@bub: im absolutely sure rear/bottom mount is better.
Anyone heard from MM lately?

Motormouth, motormouth, were art thou motormouth??