DJI Mavic Pro Salt water damage

Heres another project and that is raise a DJI Mavic Pro Platinum from the dead!

This is a Quad that crashed landed into the sea, have no idea why but my guess would be who ever was flying it ran the battery to low to get back in time?

As you can see below quite a sorry sight.

The main bottom sensor board is very salt damaged as you can see.

This was removed and run through clean warm water and then dryed off and cleaned more with isopropyl and looks better at least now:-

The esc/imu board did not look too bad apart from a tiny bit of salt corrosion around the fets. If the motors were running when it hit the sea, they will be totally shot.

The battery connector was very green and corroded, which is what I would expect as the reaction of hitting water , especially nice conductive salt water.

2 of the motors were seized and although now freed up with some oil into bearings and windings, these would need to be stripped cleaned and new bearings.

The wifi board at the back was not too bad, slight salt deposits and the gps module was also not too bad.

The gimbal was okay on 2 of the motors but seized on 1. A bit of cleaning and oil and they are now free. The camera is sealed and hence unless connector badly corroded is prob fine.

The gimbal board though got a fair bit of corrorsion on the connectors and doubt that will work again.

The battery as expected was dead. Once apart…..

Which taking these batts apart is a royal pain in the butt!!

After removing the battery pcb totally and measuring the pack, it read 0.4 volts total.

Selected nicad on the charger and slowly at 0.1 of amp started to see if it would take any charge, it slowly rose up and once it got near 9 volts, I switched to charging the pack via the lipo setting at 0.1 amp charge rate. I left it charging with a fan blowing on the pack to keep it cool. End result was it stopped charging at 12.6volts. I had to turn off the balance charge as I was charging direct to the 3 cells.

Also on a safety note, I have a metal tin close by and also was in room all the time to keep a eye out for the pack starting to puff up and turn into a fire.

(Would not advise this unless you 100% know what you doing, once cells gone this low charging can be dangerous and dont charge at anything but min charge levels.)

Not tested the fully charged pack, but I expect the cells to fall through the floor with any kind of load.

Question I hear people ask…

Is this worth a rebuild???

Really depends on how much of the quad electronics , if any still works…

Almost certainly will need 2 user parts to make it economically viable.

As using all new parts and new battery and new controller = not worth it.

Will add posts on the journey to get this to work again….

Some other pics, more cleaning required before can test what if anything still works 😉

Well the internal fan still works 😉 Although a pic wont really show that, but hey thats the first part that works ticked off list!

 

 

 

 

 

 

 

 

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DJI Mavic Mini Different models

Need to bear this in mind if you are buying a DJI Mavic Mini!!!!.

There are different versions depending on what country you buy it in!

As I read all new dji models will be hardware power locked CE or FCC etc.

If in the Uk like I am , we are stuck with the low power CE version. So about only 500 metres.

But if you buy out of the EU , you get the FCC version and about 2,500 metres.

Big issue I have is if you buy one in the EU and travel abroad in FCC countries , you are stuck with the CE , as it cant be changed to FCC unlike the older dji models that the app decides what mode to put you in, depending on whether you in CE or FCC area.

This puts me right off a Mavic Mini now, as when out of country I would be stuck in low power version. Seems crazy for a travel drone, that you stay stuck like that.

So no point in me aiming to get ones of these while I am in the CE zone.

Info and part numbers on DJI Mavic Mini models

FCC version:- Model MT1SS5      – 5.8 GHz: <30 dBm (FCC); <28 dBm (SRRC)

CE version:-   Model MT1SD25   – 2.4 GHz: <19 dBm (MIC/CE) 5.8 GHz: <14 dBm (CE)

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DJI Mavic Mini

Well its out and I have to say, think I found my replacement for the Wingsland S6.

The dji is indeed 249 grams and 2.7k 3 axis gimbal and upto 30 mins flight time.

To think the Wingsland S6 weighed 260 grams and fixed 4k camera and flight time of 5/6 mins. So no contest, even though the camera not 4k, but 2.7k is fine with a 3 axis gimbal.

And base price is with remote! Uk price £369

and £459 the fly more combo pack

Totally amazing job DJI have done with this and get the weight below 250 grams and long flight time, almost certainly by using 18650 cells and having designed there electronics and esc and motors to run at the lower voltages the 18650 cells go down too.

Would love to order one now, but going have to save the pennies and get one when I can.

These are sure going to sell like hot cakes me thinks!

 

 

 

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Wingsland S6 replacement?

Maybe for those that like the Wingsland S6 size, there will finally be another folding quad of similar size very soon!

The Mavic Mini

Okay so will be a fair bit thicker then the S6.

But leaks say anything from 18 mins to 30 mins???? stated flight time.

When I First see leaks a while back I thought the battery bay looks a lot like dual 18650 cells.

If this is true then maybe with there electronics aimed to use the lower voltage of 18650 cells on there esc motors and electronics they could get a decent flight time.

But all up weight of 245 grams??? I have a feeling thats the weight without battery?

Bear in mind the Wingsland S6 was approx 265 grams with no gimbal , thats why I sceptical about the mavic mini being 245 grams all up weight. I was guessing more like 330-350 grams for the new mavic mini myself with battery in.

But if it is that weight is with battery, that will be ideal for us flyers in the UK who will soon have that waste of time registration for craft over 250 grams.

For sure at under 250 grams, this would sell like hot cakes.

If anyone could pull this off, for sure woudl be DJI

Rumours of specs are 2.7k , 3 axis gimbal and front and downward sensors and using the enhanced wifi which is rumoured to be using same mavic air controller, if so wont be able to use Spark controller with it for sure.

Price $399 . Is that just for the quad????

Anyway, all guesswork until the 30th October 2019

DJI Event October the 30th 2019 – Fly as you are

 

 

 

 

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SkyViper V2450 GPS

Got hold of one of these SkyViper V2450 GPS a while back as a good friend of mine in the USA put me onto this quad because it uses arducopter firmware, and might be a way to cram this into a broken S6 I have lying about.

Really nice little quad considering the price and features, with only drawbacks are it uses brushed motors which will always wear out real quick and it use a very low quality 720 camera which from flight I done suffers really bad jello.

But apart from that works pretty well along with the remote it comes with.

Some teardown photos:-

The flight controller is based off the pixhawk racer hardware and is very compact with the rx for the control built on the pcb, so really nice size.

After a few flights of this until the brushed motors wore out and then onto getting this to work in a s6 shell with the original s6 motors.

 

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