XK Detect V303 – X380 Hybrid Quadcopter FPV Build – Mods and Overview (video)

I’m going to use this article as a base starting point to outline all the mods and changes I’ve made to the quad since I first got it around December 2015.  I’ll also provide some feedback on how I feel the quad performs as a sort of overview, but not a full in depth review in that sense.  Look for updates in this article over time.

V303 Quad Overview

I first purchased the quad back in December 2015 as my first full-fledged quad.  The V303 that I ended up with was of the newer generation, more x380 in internal components.  It came with the usual stock v303 battery, a 2700mah 3S.

I modified my v303 right off the bat by swapping the lower portion of the quad for the lower half shell of the x380.  By doing this I had more room to put the x380 5400 3S battery and get longer flight times.

20160305_212336 quad base x380 before install

Here is a look at the quad’s internals after I swapped the bottom shell, using the shell sold here by Banggood for $29.99

20160329_190416 cover off v303 to do gps mod close view of board

As a result of the bigger shell, I had to also order the legs for the x380, which were longer than the v303 legs.  Here is the view from above after the shell was swapped and legs put on…

20160309_201356 quad with x380 base battery view from above

Until I later got the XK 2D Brushless Gimbal, I have used the v303’s stock camera mount, which i modified to take both a CCD camera for FPV/OSD and the Runcam HD camera.

In addition to these changes, I also have the following components:

Video RX:  600 mw 5.8 GHz ImmersionRC Raceband $69.99
Video RX Antenna:  Airscrew Clover RHCP (IBcrazy) $26.95

The weight of all this at this point rings in at 40.9 oz (1159.495 grams), roughly 40.1 oz with the minimosd mod and more recently with the Git2 HD camera + XK Gimbal it weighs 46.6 oz.

I also tapped into the 12 volt solder points on the mainboard under the canopy and extended those wires to the outside of the quad.  Also, while the canopy was off, i removed the gold shielding from the GPS and applied a fresh and expanded amount around the GPS and hot glued the wires closer to the GPS module to prevent loose connections.

To make all the wires work, I had to drill holes for access into the lower shell.  This made life a lot easier in routing all the wires in the long run.

I also found this aluminum case for $64 which holds both sets of my goggles, my transmitter and the quad in the same box with extra room.  Its designed for the Phantom 1 or 2, but works perfectly.

20160514_221633 x380 quad box

20160514_221621 x380 quad box 2

This takes us to my first full blown mods beyond the ones above.


I wanted to get an OSD working with the quad, for use with Goggles, in my case the Headplay HD and Quanum V2 goggles which I have also modified.  I decided to try the EZOSD by ImmersionRC.  I had found one online from classifieds and wired it into the quad.  I paid around $80 for the used one, new its around $165.

My first try I put it on the rear of the quad, below the light.  I had issues with the GPS (its standalone/doesn’t tie in with the quads gps).  The GPS would take a long time to get an adequate lock.  I would get an altitude reading at first, which seemed ok for the first 95 feet or so, but after that it would stick at the same 95 feet or so altitude, until the quad was in the air for about 6 or 8 minutes, then suddenly catch up.  Here is an example video showing this:

20160327_192156 ezosd ontop1

So to mitigate this issue, I then tried putting it on the canopy (above), so it was facing upward, more proper.  Same results.

Then for a last resort, I installed it inside the canopy, just above the “eyes” (led front lights) of the quad and added the copper shielding tape.  Unfortunately, I ended up with the same exact situation.  From research, it seems this is just how this GPS module is.. rather slow to start.

I decided to give up on this mod and rolled onto another idea…

DragonOSD Mod

I received a used DragonOSD and wired it up in a similar manner.  I found it for around $95, where new its around $160.   Unfortunately I couldn’t even get this one to work at all.  No GPS signal could be locked.  Seemed I had a dud in this case.

I then moved onto a more custom OSD option.

Micro Minim OSD Mod

micro osd with plugged in wires better angle hereWEB

With this one you can find the full details on my dedicated article located here.  The total cost is around $12 for this guy on Amazon.  Basically it is working great at this point, though I had one “die”, where the video stopped working, but that might have been because I was doing a lot of testing of power on and off and caused a spike.  I’m able to get GPS info from the built in GPS module, as well as RSSI information from my receiver, which is not the stock receiver at this point.  So this takes us to the stock receiver swap + taranis x9D mod.

Stock Receiver Swap + Taranis x9D Mod


This is another mod where I have full details in the separate article here.  The overall goal here was to swap out the stock receiver and use my Taranis x9D Transmitter, so I could see RSSI information in the goggles and have voice driven switches.

In the end it worked out, though it took some getting used to not having the throttle stick auto snap back to center.  I use a beep to remind me if i’m on center.

XK Stock 2D Brushless Gimbal + Git 2

The latest adventure has me adding the stock XK Detect Gimbal and a Git2.  For the full breakdown on these details check out my dedicated thread here.


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