Wednesday, December 28, 2016

Testing thrust of Eachine E010 stock motor, Chaoli CL-615 and Chaoli CL-615 Upgraded motors for tiny whoop

Today on the bench: thrust test of Eachine E010 stock motor, Chaoli CL-615 and Chaoli CL-615 Upgraded motors.
Motors used in the test:
Eachine E010 stock motors (
Chaoli CL-615 motor (
Chaoli CL-615 pack of 4x motors (
Chaoli CL-615 upgraded motor (
Chaoli CL-615 upgraded pack of 4x motors (
Test results:
Stock motors have shown very good results. Chaoli motors showed even less static thrust than stock motors. Chaoli CL-615 Upgraded version motors are really more powerfull, they spin a lot faster (you can even tell it by the sound of spinning proppeler).
If you decide to swich to the more powerful motors, I would recommend to upgrade a battery to the 45C 150mAh one (, as Chaoli upgraded motors draws more current (4×1.10A=4.40A) and weaker batteries have a lot of voltage sag.

Monday, December 5, 2016

How to fix Eachine ProDVR PAL cropping issue

Good news for Eachine ProDVR and HMDVR users - newest firmware (2016-09-20) really fixes PAL cropping issue! I have flashed old and new firmware several times without problems. So flashing really works and works for both DVR units - ProDVR and HMDVR as these devices have almost identical hardware.

The old firmware. Screenshot from recorded video with OSD data. Notice the 2 bottomn lines of OSD data are cropped: 

New (2016-09-20) firmware. Screenshot from recorded video with OSD data. No cropping!

I have added the firmware file here for your convienience .

Update instructions:

Unplug power from ProDVR. Put micro SD card into card reader and connect it to the computer. Extract CRESFW.BIN file into root folder of the SD card. Put micro SD card into ProDVR. Plug in the power. ProDVR led will start to flash. First slower then faster then slower. Wait about 1 min until the LED will turn off. Dont hurry and dont unplug power too early! After LED will turn off you can disconnect and reconnect power to the PorDVR. Dont forget that you will need to set PAL/NTSC and other settings again as defaults have been loaded. 

Firmware file here: CREFSFW.BIN or here: CREFSFW.BIN

Warning: Flashing ProDVR sometimes ends in bricking the device. You can restore the bricked device with a help of serial flash reader (arduino can be used). Look for the restoring bricked ProDVR instructions.

Thursday, December 1, 2016

Racerstar RF2205 (RF2205S) motor review and thrust test

   I have recently received a set of Racerstar RF2205 2300Kv motors from Banggood for a review. Motors came well packed in a carton box. Package includes motors, bullet type prop nuts and 3mm steel screws. Motors are sold only in packs by 4 (2 CW + 2CCW). It would be great if Racerstar would offer an option to buy single motor. This will enable buying a spare one or a replacement for broken/bent/burnt motor. Personally I would suggest to sell only CW shaft thread version of these motors with a prop lock nuts. Lock nuts hold props hard enough on CW and CCW rotation motors there is no real need of different threads. Benefit of this is versatility of motor use – every motor can be either CW either CCW, no need to have 2 spares and in case of RF2205 - 4 spares.
Comes in packs by four
Motors have solid hard steel shaft. That is one of the reasons why they are heavier than BR2205.
Solid steel shaft and steel screws
There are a lot of cut-outs for air intake on the lower part of the stator. 
Cutouts for air intake and shaft nut
   Also notice that shaft is locked with 2mm hex screw instead of the C-clip. Dont tighten them too much, because plastic washer starts to rub against the bearing and introduces some drag to motor motion. 
Inside of the motor - the bell (rotor) is reinforced and well balanced. The windings are made of multi-stranded copper wire. Magnets are curved and N45SH strength grade. 

• Steel shaft – harder to bend 
• 20 AWG soft silicone wires
• Cut-outs in the bottom plate for air cooling
• Shaft is locked by hex screw instead of C-clip
• Curved magnets, N45SH
• Reinforced and balanced bell 

• Sold in packs by 4 pcs only
• Bullet type prop nuts

   Build quality is high. Thrust results show high static thrust power, one of the highest in their class. My personal opinion - they can be compared with Emax RS2205.

Here is my humble video review of these good motors:

Racerstar RF2205S 2300KV motor review (7 min 16 sec)

Static thrust tests:

Racerstar RF2205 2300KV thrust test (1 min 35 sec)

Tested with:
Batteries: 3S and 4S, 3500mAh 
ESC: Hobbywing XRotor 40A BLHeli 

Tested props:
DALPROP 5045 V2 2-blade
DALPROP T5040 3-blade 
DALPROP T5046 3-blade
DALPROP Q5040 4-blade 
KingKong 6040 2-blade

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Racerstar RF2205 (RF2205S) motor review and thrust test

   I have recently  received  a set of Racerstar RF2205 2300Kv motors  from Banggood  for a review . Motors came well packed in a carton...