NCR18650GA Test #2

Test number 2 – This time a constant 7 Amp discharge down to 3v per cell.

Ill let the video do the talking Smile

But to summarize you can get a good safe 9000mah out of these packs going down to 3.2v/cell which is very safe for these GA Li-Ions :)

The log file showing discharge voltages is in the excel file below.


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New NCR18650GA Li-Ion Packs by Pompecukor

Quick preliminary review of the new Panasonic packs which have a 30Amp discharge rating. Each cell is rated at 10Amp each.

I only intend to pull a maximum 10amps from a 4S3P configuration whilst flying my X-UAV Mini Talon, and cruise amps will be about 4-5amps.
Using a 4S5000mah pack consuming 4200mah i can do 30 miles so hoping for 55-60miles on these cells.

Firstly, Alex from makes nice packs they came well packaged, really well shrink-wrapped as well.
Alex is from Europe so you don’t get hit by import taxes and only took a week to arrive.

Firstly some visual size and real weight comparisons with pictures.
Below you will see the following.

Multistar 4S8000mah 10C lipo which is 648grams
Nanotech 4S5000mah 25-50C Lipo which is 527 grams
Pompecukor 4S3P 10,300mah 3C lipo 623 grams.


First charge took them from storage charge to full which is 4.2v/cell using a 4 amp charge rate as you can see they balance perfectly 4.2v across all 8 cells.


Next i left them to rest for an hour to simulate a trip to the field and then i put them on a constant 4amp discharge down to 3v/cell, now they are rated to 2.5v full discharge but i want them to last so will only ever run them down to 3v at most.

Discharge rig – need tidying and more load.


The initial results are brilliant, tomorrow I will complete an 8amp discharge run and graph the same

Below is the final discharge results as you can see i decided to stop at 3.15v per cell which gave me a little over 9200mah consumed. I expect the 8amp drain to bring this down to about 8000mah


The pack is a little big to fit the mini talon so i had to modify the top hatch by cutting some of the surrounding foam and gluing it to the top hatch so the battery slides in and out nicely. Some pictures below.

hatch (1)hatch (2)

hatch (3)hatch (4)

Next week will be a real world test where ill put these in my mini talon and leave it to loiter in a circle and see what kind of results i get.

For further information please go to for pricing and technical specs direct from the pack maker himself.

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Naza Can Bus Pinouts

Doing some tidying up on the quad the quad build, so decided to get some 4 pin JWT connectors.

Anyway this is the pic out from the can bus connector with it upside down.

These correspond to the OSD silkscreen text for easy if identification

Ground is brown – Top
Rx is yellow – 2nd down
TX is orange – 3rd down
5v is red – bottom


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Mini UAV Talon Build #3

OK so I’ve documented the last two builds via various blogs and videos, this is just a quick collection of pictures and notes from build #3.

Few things to note on this build.

  1. As tidy external appearance as possible.
  2. GPS telemetry back to ground station using TBS Xfire Micro RX,.
  3. No extras in this build its a simple build and I’ve made it so i can remove the wings.
  4. No UBEC this time, the Hobbywing ESC has a 7amp UBEC built in.

So again as always click pictures for bigger versions,and please leave comments or ask questions.

Weaved motor wires to help reduce RFI/EMI interference.


Love hobbywing ESC’s real quality bits of kit and this will have the brake programmed for a better glide ratio.

electronics (1)

Couple of folding props.

electronics (2)

Cut a small access hole to allow easy access to the ET Vector USB Port.

Access Hole (1)Access Hole (2)Access Hole (3)Access Hole (4)

Decided to mount the TBS Micro Receiver in the aft portion of the plane on a small piece of foam, dipole mounted vertically.

crossfire (2)crossfire (3)crossfire (4)crossfire (5)crossfire (6)crossfire (7)

Here you can see the BST connection from the ET Vecter GPS into the crossfire BST connector for telemetry back to the ground station.

crossfire (1)

Mounted the v2 GPS at the rear and flushed mounted it a little lower.

GPSv2 (1)GPSv2 (2)

Testing different positions for the VTX.

VTX Position (2)VTX Position (3)VTX Position (4)

Nice and tidy with twisted cables where possible and here you can also see the Flytron Microphone for audio.

various (1)

Opened out the V-Tail server channel holes.

various (2)various (3)

Hinged the top hatch.

various (4)various (5)various (6)various (8)various (11)

Couple of external pictures, I epoxied a mobius mount onto the pod

external (1)external (3)external (4)

And a final couple of pictures of my talons together Smile

squadron (1)squadron (2)

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2.4 Ghz Antenna Weights

Bit of a random post this but thought i would measure the weight of a few antennas as i was calculating wing counterbalance weights.

Maybe someone will find these useful Smile


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Pictures purely for forum post purposes.


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Bit of NCR18650B testing done this week

4S1P – NCR18650B Discharge Tests cutoff @ 3V/cell
1.9Amp drain = 3005mah expended quickly recovers to 3.45v/cell off load – No temperature difference.
3Amp drain = 2800mah expended quickly recovers to 3.35v/cell off load – 8 degree Celsius temperature rise.

a 4S3P pack will be fine given that i can cruise on 4-6amps and take off is only 8amps.
4S1P pack = 196grams
so a 4S3P would be 590 grams giving me a useable 8400mah with conservative throttle use.

Closest traditional lipo i could find with a weight of under 590grams is a turnigy nano-tech 4S5000mah

Soldering could do with being better,.


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ZMR250 Build PID Tuning Pt1

Finally got the 250 built with the following hardware

ZMR250 with Motormania extended arms
T-Motor 2206 2000KV motors DAL 6×4.5 Props
LittleBee 20A ESC BLHELLI 14.2
Rev 6 Naze32 running latest stable BorisB BetaFlight.
FrSky D4R-ii RX
HS1177 600TVL Camera
Lumenier Race band 5.8Ghz VTX

Quick post build video below – Before anyone comments YES im moving the VTX antenna this was just temporarily mounted for testing purposes.

So first of all i made sure all 4 ESC’s were calibrated and configured the same and as im using the latest BorisB & Naze32 i can configure them with the BLHelli suite through the Naze32 USB port :)
This also enabled me to hardwire the ESC’s and change motor direction using the software. Below is my BLHeli Config

Please bare in mind i’m new to Naze32 and mini quads so my configs might not be right, its a learning curve i’m going through right now.

Here is my cleanflight PID’s which again arnt right as im getting small oscillations on the pitch and roll which you can see in the video at the bottom of the post

CleanFlight PIDS
The resulting flight characteristics can be seen here

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Alien X-Mode Quad v2 Endurance Build Pt3 (Motors & Legs)

Back again and more progress made although I’m still waiting for RC-LOG to release the new v2 Vector Glonas GPS module so I’m kind of in no rush.

OK so last time i mentioned the fact that I’m going to use SunnySky 600KV motors instead of the original 470KV Tigers well here we have some pictures and thoughts on the motors.

Here we see the 470KV right and the Sunny 600KV on the left, the SunnySky’s are slightly heavier, and as you can see wider.

Motors (1)

The build quality is nice and having span them up on a test rig the bearings sound smooth, the windings look nice and tight as well.

Motors (3)

Below you can see the size difference while mounted on the Aeroxcraft X55 arms.

Motors (4)Motors (5)

The legs have finally been cut down and mounted to the bottom plate of the frame along with the carbon fibre lipo tray. I plan to use 4S5000mah lipos although there is space and the airframe will lift a 4S8000mah lipo as well Smile

First you can see how i marked out the extra holes for the alloy leg mounts.


Now with the leg mounts fitted and the lipo tray spacer.


Looking good SmileIMG_20151126_212615~2

Nice side on shot.IMG_20151126_212648~2

And finally we have the legs fitted we can see the ground clearance.

legs (1)

That’s with the 4S5000mah lipo fitted underneath.legs (2)legs (3)

Not far off now just electronics to wire up, FPV gear and then program the flight controller.

Come back soon for another update Smile

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Alien X-Mode Quad v2 Endurance Build Pt3… Motors Props and AUW considerations.!!

Well what can i say apart from I’m a Muppet, my original plan was to use 470KV motors
and 14” props on the Aeroxcraft X55 arms.. How wrong could i be.!!!
14” wont fit, and neither will 13”s Sad smile check this out below … Argghh.!!

prop hit

So after much deliberation i thought the hell with it go with 12” props and MN3508 580KV motors .. But oh wait..,. Nowhere in the UK has them in stock ..Grr!!.

The quad gods are definitely not on my side, so eventually managed to order some SunnySky 4108 600KV motors.

Ecalc comparisons below, shouldn’t loose too much efficiency.
Top is 470KV with 13”x5.5” props and bottom is 600KV with 12”x5.5” props.
Click the picture for full size version


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