Hi All,

I purchased a ACK80 Attacking Chicken 2S FPV Drone Frame kit, with 4 RCinpower 11500kv 1205.5 motors as from aliexpress for about AU$92 by the time the frame kit with motors shipped, the only thing that I had to supply was the AIO with the receiver and a walksnail 1S VTX

As built






Unfortunately looks like one of the motors is faulty 


I can get it to fly with the faulty motor if I flash it with Bluejay 24Mhz, but the motor will twitch when flying, so I am going to try and get a replacement motor, as I would prefer to fly with either Bluejay 48Mhz or 96Mhz for this little quad.

The kit was a little dodgy as no nuts were supplied and I had to design and print some of my own 3D parts.

The smaller RCIP motors come packaged in individual hard plastic clam shell boxes which provide decent protection. It is possible that instead the ESC is defective. You can try swapping two motors first to confirm if it is a defective ESC or motor.

Hi Cyberess,

Nice looking quad.     Good Job. 

I like how the whoop part connects to the frame. 

Later, iFly  

did you enable startup power setting for 1s quads in bjc?
if not, it could be a related to that

I pulled the model apart for about the 4th time, unsolderd the motor in position 1 and soldered another motor into the position, a smaller motor just for testing, just to check the stalling issue as notice, then tested with Blujay 96MHz -- the motor started and seemed O.K. rolling on and on throttle and it seemed O.K., now this is where I get silly, I then resolded the old motor back into position, and reassembled.. Once again that one motor can not run on Bluejay 96Hhz, then I rolled down to 48Mhz O.K motor runs, but testing for flight QUad just freaks out on ARM. O.K. Rolled down to 24Mhz, O.K. I can ARM and fly now. I am on Betaflight 4.4 stock PIDs and tune only with RPM filtering enabled, I am flying it sounds O.K. but chewing battery, I am flying very slowly over soft lawn as I don't trust this model -- I did give the throttle a shake, and did some studden yaw movements and came back and landed. Battery change tried to take off and freakout on ARM again, disconnected the battery reconnect and started to fly, O.K. it seems O.K. then another freak out, disarmed and the quad ended up sitting on the edge of the swimming pool.

O.K. this project is going to be put to one side at this moment, as I am certain the main cause is a stuffed motor even though the motors are new, and I have started chasing the Aliexpress vendor for another motor or a solution.

The question about how whoop parts connect to the Frame, the assembly is 4 long screws the main FC is the usual 4 gummy configuration with an nut above the gummy to make sure that the gummy don't get crushed, and that the FC does have dumping from the gummies.

I have now removed the motors that came with the kit -- as I don't have a spare motor

I did like the pink colour of these motors
I am getting quite good at unsoldering and removing components
I have marked the bad motor with a red marker underneath as I never want to see that motor in another build.

I had a another set of motors Diatone Mamba 1103 12000KV that I was planning on using for another project, they are now installed on this Chicken Shit project..

The motors are in and fully it's assembled and I have designed a new camera mount a bit longer, and printed in nice soft TPU.


Passed all tests now, and I have bluejay 96Mhz installed, and these motors are super smooth, this has now been out for 3 flights. There is zero jello -- O.K. it was rather dull when flying.

This build has come in a bit heavy, it's 69g, the Mamba 1103  motors are quite heavy for some reason, they are actually heavier than the RCinpower 1202 motors, and the other issue I guess I used a full size external ELRS receiver, to give an idea how heavy this came in comparing the weight to a Meteor85 Walksnail that I have it comes in at 54g

Comparing sizes:

 Mobula8 vs ACK80 vs Meteor85

O.K. this build actually has a lot of jello, it shows up flying bright light.. I am now working on cinematic settings, for indoor and outdoor flying.

As inspired by this video

Despite the jello everything else is working well, the Walksnail video is excellent but unfortunately this frame kit is a bit of    and certainly not recommended, so this drone might not exist soon, as I am eyeing off a meteor85 frame that I have sitting around. Hmm I could build a much lighter inverted Meteor85 2" build, with bi-blades and get nearly double the flight time.

I will keep tuning and playing with this model for this moment as it looks so pretty (rather good looking model) and see what I come with, never know I might solve the Jello issue, but I doubt it.

Hi Cyberess,

Well, it is still a good looking build. I guess you might say Form over Function.

I like the top TPU piece that mounts the antennas and batteries, that is a
very slick design. GOOD JOB.      

It is actually inspiring and has got me thinking (brain cells burning). 

Keep working on it (at least for a while). There is a solution for everything.
Maybe you will find a way to remove or reduce the Jello. Please let us know
if you do. 

Later, iFly  

I have been flying this build around a bit, and I think the jello is caused by the wrong propeller selection, what the kit came with is  1.6 Inch Gemfan 40MM 1608 3 Blade propellers, being 40mm and I think the 1608 -- 1.6 Inch with 0.8 degree pitch 3 blade, will that's very low pitched small props and they are just over reving, causing vibration, and noise -- hence the Jello effect as in the video feed.



Looking at the hoops and measuring the space I should be able to fit in 45mm props  in the hoops, so I am ordering 1.77 Inch Gemfan 45MM 1715 3 Blade props, that's larger diameter and a much higher pitch so hopefully will make this a better setup, and clean up jello issue.

i missed that you was using 2s in my firat post.
turtle mode is bad for testing, as there is a limited startuppower doe protection

small motors does need higher motortiming and higher startup value, specialy for high khz frequency like 96khz.
if you maybe like to try thw motors again? maybe they are still fresh and well. that thought just came up while reading.

nice you got it solved by other motors anyway :-)

for the jello, either higher startup power could be the solution. lower could be tried either, but i believe its the wrong direction.
wrong startuppower does cause much noise to the system.

after adjusting startup or anyway a thing i would do on 2s and small rotor diameter would be a 220uf 25v rubycon capacitator.

sadly default values doesnt cover whoops at all, some does fly acceptable but startup power and timing is way to low for whoops. bluejay does plaster or somehow solve it by the setting for 1s voltage. it doesnt realy match 1s in general it just focuses the general issue of the to low value for common 1s builds.
focus timing and startup is realy essential for small motors and whoops, befor pids and filtering.

what weight do you have on that build? alot of weight could missmatch the frames stiffness, give vibrations therefor. maybe decrease the weight just for testing a bit, tom come to the source of the jello if nothing else helps

I did manage to try out 45mm propellers 




It did fly better with slightly longer flight but disappointing the jello issues was worse, probably why the kit was supplied with 40mm props. I could redesign the the camera mount, but it's not worth it. Anyway this quad being dismantled, as I have already built what I have called the Mobula8 Nut Job  now and it's a much better quad with longer flight time, handles better and zero jello.. Actually I am quite happy with the Mobula8 Nut Job 

The ACK80 being dismantled 


The new idea and frame I am going to a 2.5 Inch GepRC Quad


I have already hit a snag with the transfer of parts, but I will create a new thread for the the new build.

Hi Cyberess,

Personally, I like that 2.5 inch GEPRC frame and have several builds where
that frame is use as a base plate.

Later, iFly