Bedding in lipo’s

Something I keep meaning to write is a post about is the old wives tales so many keep making on forums and youtube videos, and that is you need to make 10/20 flights before you get the best flight time from a new battery.

Drives me nuts this one!

Lipo batteries DO NOT need any bedding in for 10/20 flights!!!!

Even the manufacturer’s of these batteries state you do not need to do this and there battery will not perform any better , and yet people still advise people to run there new batteries in!

If the manufacturer’s state its not needed, then why do users think they know better????

There are even some youtube videos that have tested this and they also come to same conclusion , bedding in lipo packs does nothing to increase flight time or battery life.

Looking after your packs and not running them to low or charging at a excessive charge rate and keeping at storage voltage when not used for a while is best common sense approach.

There is a small chance that as the bearings wear in , it could and I state only could increase flight time a very very tiny bit, but for sure the battery chemistry does not work like this and those that manufacture the packs certainly never state they need bedding in.

I dare say people out there will still push this old wives tale, but that is all it is … A tale…

Happy flying 🙂

 

Posted in Radio Control Models, Technology | Leave a comment

DJI Mavic Pro Platinum repair

Update on the salt water damaged DJI Mavic pro platinum.

Sadly although the esc was making the startup dji tones, it turns out it was damaged and its not supplying the supply voltages to the main board.

On closer inspection the print tracks going to connectors are all badly corroded and if available , would at least need all new connectors.

So for now this project has hit a brick wall as thus far parts it would need to get it working again will at least be:-

Esc board , main board , 2 x motors.

Issue is getting hold of a platinum esc board is very difficult in the uk.

Can order from China , but many suppliers claim there esc is for platinum version , but show the older board. The platinum version has the newer esc chips on and so hence would rather get the correct board.

Anyway with how much the prices of second user Mavic pro’s have dropped, that means the cost of a esc board and main board etc really makes this uneconomical at present.

Its a shame, but when a craft has landed in the sea and left to dry out with battery left in = a uneconomical mess.

There is a chance the main board still works, but for sure at all the quadcopters I have looked at that have landed in the sea and not rinsed with clean or distilled water asap and battery removed, the esc part always dies.

Links to other posts on this project:-

1 DJI Mavic Pro Salt water damage

2 DJI Mavic pro ESC test

3 DJI Mavic pro Camera teardown

 

 

 

Posted in DJI Mavic Pro, Radio Control Models | Leave a comment

Mavic pro camera disassembly

Just a quick teardown of the Mavic Pro camera to see if any salt water corrosion made it into the camera and connector and surprisingly there was none.

So maybe camera part still fine, but no doubt the gimbal motors which were almost seized when I got it and even though I cleaned them up and they move freely now will prob show gimbal over load error as they are very sensitive to any friction and bearings prob shot.

But we shall see and the gimbal part with just motors is available as a spare part which is not expensive as long as camera lens and camera and gimbal pcb works still.

Links to other posts on this project:-

1 DJI Mavic Pro Salt water damage

2 DJI Mavic pro ESC test

Posted in DJI Mavic Pro, Radio Control Models | Leave a comment

Mavic Pro ESC test

Carrying on my testing after getting hold of a insurance write off Mavic Pro Platinum that landed/crashed into the sea.

Now time to test the esc board and after much cleaning with fresh water and removing the salt deposits and then cleaning with switch cleaner any remaining residue .

I connected it up to start with a 18650 cell , as wanted to see if anything got hot or it drew a lot of amps.

All seemed fine and even the motor led came on.!

Then tested with a 2s 18650 pack and this time the dji start up esc tones came through.

Then a final test with the original mavic battery pack minus the battery pcb as thats history.

Apart from the startup tones, all 4 motors twitched as they should normally do.

One thing for sure, one of the motors has totally useless bearings as spining it in a small hobby drill attached to the shaft , its as noisey as hell the other 3 sound okay although will replace the bearings anyhow.

 

So hopefully this is a sign the esc board is possibly okay? Will be pretty amazing if it is after landing in the sea and then had its battery left in it and sat in a insurance office for god knows how long festing away.

Do wonder if this hit the sea after the motors had already stopped? as the mosfets on the esc seem to be okay. I would expect them to blow normally with motors running hitting water.

Also amazing the lipo which was reading 0.4 volts total when I got it and it charges all the way back up and seems to have decent life in it apart from 1 cell which after 2 days drops to 0 volts again, but other 2 cells stay put. Intresting as a test and nothing more, will never be used in flight again.

The gps board that I had plugged in was sending a charge to its onboard backup battery, but to see whether it actually survived will need the main board connected.

The fan motor, I already know works okay.

Next thing will no doubt be the main board and that was in the worst condition , as it has salt deposits all over it and has had lots of cleaning, especially to connectors which were badly oxidised. I dont expect this to work , but will test it anyways as long as I dont find any shorts on the boards first.

Links below to other posts on this project.

1 DJI Mavic Pro Salt water damage

 

Posted in DJI Mavic Pro, Radio Control Models | Tagged | 1 Comment

Onagofly

Just got hold of one of these discontinued Onagofly’s.

Just curious really as all the reviews back in the day were terrible.

Is it really so bad????

Another pic compared to Wingsland S6 for size.

Its weighs about 200 grams, so at least does not need registering in the Uk (at present)

The battery is a 800mah 2s lipo inside the quad and charged from a lead underneath into the Onagofly supplied charger.

First thing I done before flying was to load up mission planner and do the Accelerometer calibration and level one and then into the compass and do that too.

Dont know if this is needed as it might be self checking this on every boot, but done it anyways.

Risked a flight indoors, and took off okay and jumped up about 6/7 feet and then settled down a bit lower than that, but it wanders around a lot and controlling this by the phone was tricky and laggy.

The Onagofly app will not run on my iphone 6 with ios 12.4 , it crashes all the time.

So had it running on a iphone 5 with ios 10.3.4, which worked okay apart from being extremely laggy, even with video view settings set lower on app.

I did try a small tethered test outside and it took off and went to fly back into the wall , but as I had it terthered on a bit of string, was able to yank it back and then it caught up in string and ended the test.

It did show on app and via blue lights on craft it has gps lock, but as this shows at locked with 6 gps Sats, me thinks that not enough for this craft and needing at least 8+ would make more sense.

So pretty much un useable via the app as far as I am concerned, but I know there are some ppm pads inside to connect a normal rx receiver, so that is the next thing I shall try.

So onto some mods next.

 

 

 

 

 

 

Posted in Onagofly, Radio Control Models | Leave a comment