Budget lightweight brushless 2"

By QuadifyRC.com on Jul 25, 2017

2 746  5 

Objective

I already have a power 2 inch mirco based on 1104 motors, this is going as light as possible except taking a 2.5g hit to allow for 3s over limiting to 2s with the 8g 10a flytower I've chose over the 5.5g super_s 6a flytower. I started this with a target weight of 40g but came in at round 45. I can probably get another 2g or so off but am reasonably happy with this weight.

Oh yeah, everything bought on sale since I'm cheap.

Parts

Mini Brushless F3 Flight Control System
Racerstar br1103 motors
x2 EYAS frame 9.5g
GEMFAN BN2035 - 4 Four-blade Propeller 10 Pairs - PURPLE
600TVL 1/4 1.8mm CMOS FPV 170 Degree Wide Angle Lens Camera PAL/NTSC 3.7-5V
Eachine TX01 NTSC Super Mini AIO 5.8G 40CH 25MW VTX 600TVL 1/4 Cmos FPV Camera
FS82 MICRO 2.4G 8CH Flysky Compatible Receiver With PPM I-Bus Output

Building

For OSD I had to intecept the video wire on the TX01. On the bottom connections it is the innermost connector. Snip this and put a wire loop in like I've done in yellow. Snip this loop and it becomes the Vin and Vout. CP antenna was replace with a dipole and heat shrunk. Saves about 0.5g and is more durable.

F3 board soldered up with ESC including VBat wires for monitoring in betaflight OSD. No issues with the wiring diagram on Aliexpress. I've trimmed the flytower standoffs so the props clear and the FS82 receiver can be wedged underneath the camera assembly.

Added the little LED-buzzer assembly. No issues with the led in betaflight which has been programmed but the buzzer seems to want an earth switch? Will figure that one out later.

Xt30 is an overkill on this probably but all my batteries now have these and it should be capable of 3s.

Have swapped the babyhawk battery strap for the little rubber bands it came with to save about 0.8g

I've also left the rear standoff off for easy usb access while I set up.

Just got back from the maiden with a 49g 950mah 2s. Clearly too heavy but got a 9 minute (sluggish) flight.

Nanotech 2s 300mah have arrived, 63g including battery and 3-4 minutes flight time. Feels light and very easy to fly.

Update

Have rubuilt the stack to be lower using 12mm m2 nylon screws and nylon nuts/ orings as spacers. Have removed the buzzer/led to use escs beeps for lost model. Lastly, switched xt30 for jst. Down to 40g dry, 58g with 2s 300mah which flies for around 4-5 minutes.

Photos

Discussion

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Rad199   Aug 24, 2017  

How durable is it

QuadifyRC.com   Aug 24, 2017 

Not sure, I don't crash.

J/K it is actually very durable so far thanks in large to the light weight means it has very little inertia. Building it is scary given how fragile the components look even though I didn't break it. Once together it is compact and feels tough.

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