I own a number of other quads ranging in size from 250mm to 120mm and I wanted something a little smaller and less intimidating to fly around the neighborhood with and at the local parks. I also wanted to leave some room for future upgrades in the event that I ever wanna switch it over to 3S so I based this build on the same stack found in the leader 120 (Omnibus Micro F3 x 20a 4in1 esc). This means its already 3s capable but will require a simple motor upgrade before switching over from 2S. The FC also feature beta flight OSD for flight stats and the whole thing minus batteries / rx / props can at this time be built for less than 75 dollars shipped.

Design Tips:

Its very hard to come by m2 standoffs smaller than 6mm so to keep the distance between the 4in1esc and FC to a minimum I actually used 2x m2 bolts in each corner beneath both the flight controller and the esc. I also had to rotate the flight controller 90 degress clockwise in order to allow for enough room for the Micro USB / VBAT and 8pin ports to not touch eachother.

Design Obstacles:

Frame: The frame I chose is very well designed but the standoffs included for the bottom half I found were too short to allow for much clearance in terms of the 4in1esc and flight controller. Additionally, there was no room to secure the RX anywhere but to the side of the camera housing which leaves it exposed and positioned in an odd place. So what I did was use taller standoffs (m2x15) which allowes for more clearance beneath the camera and I was then able to zip tie the RX in place below.

Motors/Props: The 1103 Motors I used have a very low profile and with 2inch props there is just barely enough room between the props tips and the esc. This makes me nervous especially since in the event of a crash they can easily bend down and at that point probably touch. So as a workaround you can use 110x vibration dampners to slightly elevate the motor from the frame. Alternatively you can just purchase 1104, 1105, 1106 motors which will naturally be taller or use smaller 1935/1735 props.

Betaflight: Since this build uses an AIO LST S2 800TVL/VTX if you plan on using the betaflight OSD for flight stats you will need to snip the top pin found on the right hand side of the cam/vtx combo. From there you can solder wire to both pins indvidually that way you can split them to the video in / video out on the flight controller. Also, w/ the placement of the flight controller (the only orientation that will work for this build) if you need to plug it in to betaflight for configuration or updates it will require that you remove the front standoff each time since it blocks access to the Micro USB port (minor inconvenience).

Maiden Flight:

Battery Testing:

Update 11/21/2018 - Switched batteries to Crazypony 450mah 2s 80c lipos (https://amzn.to/2KmsfG5). Weight is slightly less than the fullspeed lipos + they have a much higher discharge rate and only 50 less mah per lipo.

Quick test using the Fullspeed 500mah 2s 30c lipos vs Tattu 650mah 2S 75C vs Turnigy Nanotech 450mah 2S 65C. The full speed lipos seen in the first clip are defintely my battery of choice right now. The other two seem to work good also but arent quite as punchy and are much heavier / wider which you can defintely notice during acro maneuvers.

Updates:

6) After breaking the camera housing in a crash Ive switched from m3 bolts to m3 nylon screws. They save weight and will break in the event of a crash rather than the frame itself.

5) No longer using the pictured battery strap. Instead I am now using the method @ h t t p s://www.youtube.com/watch?v=CCE0X30dxtU

4) RX Antenna wire has been removed from between the two rear props and ziptied to the right side of the camera housing

3) Upgraded props to Gemfan 2035 quad blades. Also really liking the Rotor X 1940s / Gemfan Hulkies 2040's

2) The flight stack used in the original build has been discontinued at Gearbest. I have updated the parts list below with another similar Omnibus F3 / 20a esc stack.

1) 3D Printed some custom 110x vibration dampeners in TPU for the arms. They have helped big time with keeping vibrations to a minimum with larger sized lipos and also serve as a layer of protection for the frame in the event of a crash. Dl them @ https://www.thingiverse.com/thing:2857509