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Racerstar BR2307S 2500KV review

Edit: I have flow these today 12.11.2017, they are smooth and quiet, I have flown 7 packs and it they aren’t even getting warm after 3 minute flight in typical racing conditions with DAL 5046C props. They really open up and show full potential above 60-65% throttle. It seems that these motors have a lot of power and accelerate really fast.

Here is a test video with the first pack

Edit 2: I have been flying these with Dal Cyclone 5046 and I really like the torque they provide on low throttle, they seem to be more than able to work with heavier props. I have found this youtube review with thrust results https://www.youtube.com/watch?v=l3fxH… and they seem to pull 1400 grams and drawing around 40 amps on 5046C at max throttle.

You are getting what you have paid for. These motors are certainly a bargain for a cheaper builds and also as motors used for training without worrying if you destroy them. I have ordered these as soon as they were available for sale on BangGood. I was worried a bit since there were no reviews, but based on my previous experience with Racerstar motors, I have decided to bite the bullet and order them.

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The Racerstar BR2307S 2500KV arrived in regular Racerstar motor paperbox packaging  protected in bubble wrap. There were no extras in the box except for a nylon bag with 4X M3x8 and 4X M3x6 motor screws.

It seems that Racerstar stopped the practice of offering CW and CCW motors and from now on they are only offering CW ones. Anyway in my experience,  the previous models as BR2306S the CCW ones had problems with the build quality.

Overall look and quality

These are very nice looking motors and they look exceptionally good when mounted on a miniquad. The overall build quality seems similar or a bit lower than the one on BR2306S, there are small dents on the bell edge, the anodizing of screw nuts seems like unfinished. Maybe this is due to the fact that this is first series of these motors but it is worth noting. It looks that these motors are painted instead of anodized. There are visible traces on the motor screw nut and at the motor bottom.

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One of the things that I have found to be improved is the bearing quality, all 4 motors have decent bearings and no vertical movement on the bell.
The magnets that are used in these motors look lake the ones used in BR2306S. They aren’t curved and the air gap has considerable height.
The windings seem to be machine filled with multi-strand wires.

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The motor wires are 7cm long which is unfavorable for a builds with 4in1 ESCs where you should put some extra effort in extending the wires.

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The motor weight is 37 grams with the wires, probably 34 grams with shorter wires on a normal build with 4 ESCs.

The height is 34mm and the width is 28.5mm

I have yet to test these, and I’m going to install them on one of my KISS builds tonight as soon as I finish this post. They should serve as a replacement for Emax RS2205 2300KV so on paper they should be a considerable improvement. I will update this post with my impressions.

You can buy these motors here

 

 

Pros and Cons

Pros: Cheap great looking motors, for budget builds or for race practice. No play in the bell and the bearings are smooth on all 4 motors that I have got.

Cons: Build quality seems similar or a bit lower then previous models. The motor seems painted and not anodized. The motors use C-clip. It would be great improvement to see the similar motors with a screw instead. There is considerable airgap between the magnets and the stator. They seem a bit heavy and the wire length is not suitable for 4in1 ESC builds

Moments from the photo session

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iFlight iX5 and Thor Loki carbon frames

Recently I have finished a build based on Omnibus F4 Pro and Racerstar 33A 4in1 ESCs. I have flown it three times and the FC stopped working so I had to replace it and since it was clone I have bought the original Omnibus from a friend. After that I have had some problems with ESC desyncs and I have managed to break my X-Foot frame, so instead of ordering another one, since I started to suspect that this will be a problematic build, I have started looking for affordable 200-210mm carbon frames with 4-5mm thick base plate.

After doing some research I have ordered one Loki V1 with 5mm base plate and one V2  with T700 carbon. The V1 one arrived sooner than the other so I have moved everything on this frame. These frames are versatile and could be used both for racing and freestyle. The battery can be placed on the bottom and on the top depending on your style of flying.

Loki V1

THOR210 Loki (nevermind the naming)

This frame costs $30 on Aliexpress. The baseplate is 5mm thick and the top plate is 2mm thick and the overall weight is around 90 grams with hardware.
I have read that some people complain that the carbon isn’t stiff enough and it bends on crashes and I can confirm that this is true, since I have managed to slightly bend one of the arms without breaking it. After that I was able to straighten it up and I have reinforced the arms side walls with super glue which made the arms stiffer.
Overall I’m satisfied with this frame but if I should decide between this one and the V2, I would get the V2

THOR V2 Loki

This is upgraded version of the V1, it costs around $36, it is a bit lighter,  82 grams it has titanium screws and it is made of T700 high quality carbon. The bottom plate has recessed bolt holes. The kit also includes camera side plates. I haven’t got my hands on this one, since I’m still waiting it to arrive, but I will update this post with my findings as soon as I got it.

Thor v2

iFlight iX5 V2

iFlight has been producing a high quality frames for a affordable price for quite a while now. They have several versions of the iX5 based on the build material: carbon fiber, carbon fiber composite and carbon and molding composite material. The overall frame geometry is similar to the Thor frames. The carbon fiber costs $35 and it weights 85 grams, the baseplate is made from 4mm carbon fiber and 2mm top plate. Be aware that this frame uses 28mm standoffs and some cameras may not fit in.

Carbon fiber iFlight iX5

When ordering from iFlight website you have the ability to choose and combine it with additional accessories.
Overall this is really high quality carbon frame that is widely used as a goto frame for cheaper builds. A lot of pilots are flying rigs based on this frame that are around 250 grams range.

The composite version – iFlight RACER iX5S costs $34 and it is based on composite material and 3K carbon sandwich. This combination provides a very light frame 66.7 grams and doesn’t sacrifice the overall toughness. The composite material seems to be balsa wood as stated in the product description.

Composite iFlight iX5

The molded composite material version – iFlight Ultimate iX5 costs $35 and is similar to the one above with one difference that the carbon fiber sheets are molded around the balsa instead of sandwiched

Molded iFlight iX5

Let me know your thoughts, what is your favorite carbon frame?

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Hobbywing XRotor Micro 40A 2-5S 4 in 1 BLHeli_S DShot600 Ready

Hobbywing is a long time player on the market of top-notch ESCs and finally, they have come up with a 4 in 1 40 amp DShot600 ready ESC with a current sensor and support for up to 5S voltage.

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To be honest, if I had seen this ESC half year ago I would have been asking myself why 40A, but as the things are developing we may need batteries with double C rating then the ones that are already on the market, especially for motors like BrotherHobby Avenger

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The build quality is up to the Hobbywing standards. They are using EMF8BB21F16G MCUs with the operating frequency of up to 48MHz. The motor soldering pads are neatly placed on the board and not protruding from the sides as on the Racerstar 4 in 1 ESCs which from other side means that you may need a bit longer motor wires compared to the other ESCs but I don’t think that may be a problem on builds that are up to 210mm. Sometimes even on them if you are unlucky enough you may have to extend the motor wires for motors like Racerstar BR2306S that are almost suitable on 210mm frame (one of the wires could reach the soldering pads, but you will have to extend the other two). There is a dedicated connector for Hobbywing XRotor Omnibus F4 Flight Controller which means far less soldering, you will have to solder the video in and video out wires for the OSD and the SBUS connection wires for your receiver. There is also dedicated type connector on the FC, probably for a VTX, but by the time I’m typing this post it is not out yet and it seems that they will be going the “cube” path too by offering all in one stack.

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One thing to note that the ESC could only provide BEC output of 5V for up to 1.5A,  although there are 3.3V, 5.2V and 12V pads on the board they are only for voltage monitoring and they couldn’t provide the load capacity

Specification:
Brand name: Hobbywing
Item name: XRotor 40A ESC
Cont./Peak Current: 40Ax4/50Ax4
Input Voltage: 2-5S Lipo
BEC output: 5V & 1.5A
Firmware: BLHeli_S A-H-50 16.5
Input Wires: Red-14AWG-130mm / Black-14AWG-130mm
Output Wires: No wires but solder tabs
Support: DShot150/300/600,  Oneshot125, Oneshot42
Size: 42.6x36x4mm
Weight: 10g

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Racerstar TattooF4S 30A BLHELI_32 4in1 ESC 5V BEC w/ F4 Flight Controller AIO OSD BEC Current Sensor

Finally, the prayers of many fpv pilots were answered, Racerstar has come with an all in one solution that that incorporates F4 flight controller, 4 in 1 ESC with ‎BLHeli_32, OSD and current sensor – TattooF4S

Is is currently in preorder on BangGood and it sells for $75 which is almost equal to the price of buying decent F4 FC and 4 in 1 ESC.

TattooF4S

This one seems a super solution for neat light builds and also a much better solution for having current sensor than the one on Omnibus boards.

One of my concerns is that it is rated only up to 30A so you should be careful with the choice of motors and props.

Here are some specs:
BLHELI_32 4in1 30A+F4+OSD
Con.current: 30A
Peak current(10s): 35A
SBEC: 3A/5V
Lipo: 2-4s
Programming: yes

F4+OSD+BEC+CURRENT
Input: 2-4s lipo
Output voltage: 5V/2A
STM32F4 CPU
ICM-MPU6000 Accelerometers and Gyroscopes
MicroUSB socket
Weight: 22g
Size(PCB): 36*36mm

TattooF4S - What's in the package

Package inlcuded:
1* 30A 4in1 ESC built-in F4 flight controller
1* power cable
1* bag of screws

 

365

365 photo project with aerial twist

It has been a while since I have posted something here. Probably because I was waiting for something important or maybe because I have spent much more time with my family and outside than by my computer.

There are few other blog posts that I plan to write in near future like the one for my relatively new stone balancing hobby and pottentionally some reviews of the equipment that I’m using for this project.

For the past 9 days I have posted one aerial photo per day on Instagram, so yesterday I have decided to start a 365 project but done only with aerial photos. For those that need an explanation, it is a photography project that requires you to take a photo a day for a whole year. It will be an interesting challenge to go out and take an aerial photo almost every day with exception of the days when it will rain or snow. For such days I will have to have a backup solution, either an aerial photo taken another day or I will use that day for checking the equipment and have a picture of that. Since this is a big commitment I will start with 30 days first and see where will that take me. I would be glad to hear your thoughts.

Here is one photo that I took today, not so good weather but I will have to work with what I have

Skupi archaeological site

Scupi is an archaeological site located between Zajčev Rid (Зајчев Рид ‘Rabbit Hill’) and the Vardar River, several kilometers from the center of Skopje, in the Republic of Macedonia. A Roman military camp was founded here in the second century BC on the site of an older Dardanian settlement.

All photos are shot with GoPro 3 strapped on my QAV210 freestyle mini quad (drone). There is no gimbal and no GPS positioning so it requires some patience and a bit of circling in order to frame the perfect shot.


I certainly hope that at some point in time I would manage to get some sponsors that will help me replace some of the old parts on my quadcopter.

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Feel free to visit my Instagram profile here and check my progress.