This is Link - The best 2.5" freestyle quad in the world.

By The Van on Mar 11, 2018

34  1,875  18

And I do mean the best.

Ever since the Split Mini came out, I'd been determined to fit it into a nice package. Reviews mentioned stack height being a setback, but they all used 4in1 ESC, stack VTX, etc.. If you go that route, then yes you're going to have a ridiculous stack and most likely a pretty dumb looking quad that may or may not fly all weird!

Enter the Nemesis X. Another product that, once I saw it, I knew it was the 2.5" frame for me. I'm a sucker for a low CG and it doesn't seem like many micro frames really give a damn about that. I've heard from a few people that 'CG doesn't matter on quads that size' - but I would argue the opposite, that it matters just as much if not more than on a 5" build. It's about easing the load on your components. Your FC, Motors, and ESC don't have to work as hard to make small adjustments rotating on an axis when they aren't pulling a bunch of weight from underneath. I've flown a lot of micros that - for lack of a better term - just feel WONKY and I attribute much of that to the fact that they're fighting weird weight distribution. Bottom mount batteries only make sense when they're balanced with significant weight at the top (i.e. an action cam in a typical mini quad). Most micros use a bottom mount and yada yada they all fly like weird little micros. (Spared some redundant lecturing here)

So the goal was a low CG micro that shoots decent HD footage and FLIES WELL.

Stack height being tricky, I had to choose a FC board that didn't need a separate PDB (or 4in1 ESC). DYS F4 has a nice layout and most importantly a built in PDB. I also like that I get to run an F4 chip and OSD at this size. This is mounted directly to the bottom plate on its soft-mounts with no standoffs. To achieve this I had to make some cuts in the base plate where the board's tallest components sit, in order to sink it down into the base plate. ! One more tip: Originally I soldered the battery lead straight upward from the board. This gave me nothing to secure it to AND blocked the SD card slot on the Split (think I actually broke the SD card slot on the first Split Mini I used.. replacement arrives today :/ ). I reoriented them to come out of the side (the way you'd normally do it) and from there it twists up and is secured to the front right standoff. Will update with photos.

Needed power. Hyperlite 1106 @7122kv on 3S delivers and then some. Met with a throttle curve for smoother control (for me this is a freestyle quad)

Now, I could very well have used the 20a or maybe even the 15a bullet - BUT - those are the exact same size as the 30a and about the same price. Sold.

The VTX03 is the smallest VTX with at least 200mw output. That new TBS thing, the micro Unify or whatnot would have fit a lot more easily but only delivers 50mw max output. Not ideal for me as I want range enough to explore and fly around trees etc. The VTX03 fits just behind the camera with almost no room to spare. All wires and antenna are routed in between the Split Mini and DYS F4.

I almost always buy my FPV antennae as leaps of faith. New ones come out all the time and are seldom talked about at length. This Lumenier dipole looked interesting - lightweight, small, rather durable it seemed. Big surprise is just how fantastic reception is. I've used some pretty good antennae: AXII, VAS Ion, Triumph, some Pagodas (not a big fan), and this little dipole seems to be able to hang with all those. Much, much better than a dipole whip.

I've now doubled up on the Tattu 450mah 3S 45C packs. The cell size is just perfect for the Nemesis' top plate, it provides plenty of power and lasts a good 3min on this quad. I'm sure other packs will work great, you could probably get more flight time out of a 550 or 600mah pack, maybe squeeze a little bit more thrust out of a higher C rating but for me, these rock.

Still playing with prop choices and working on a tune. PID values are a good bit lower than stock in BF. Pictured are the Gemfan 2540 but I'm liking the HQ 2535 more so far. The HQ seems more durable and trades just a tiny bit of smoothness for responsiveness when compared to the Gemfan.

UPDATE: This build inspired production of the 20mm hop-up kit. BRDM sent me one to try out and it's a much nicer fit! New photos added.

Photos

Discussion

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Abonacci   Mar 30, 2018  
1

Could you elaborate on your throttle curve  adjustments? Interested!

The Van   Apr 02, 2018 

Totally! As far as how they're applied, I do it in my Taranis. I believe some people use Throttle Expo in betaflight, but I don't know anything about that.

In Open TX, you just go to your model, page over to the Curves section and add a Curve. You can add points to the curve and plot their locations on the graph to adjust the line. Then you apply the curve to the Throttle channel (in the Outputs tab I believe) I've used this both to reduce low end thrust when it feels like there's just too much power at low throttle; and to add it, like when it feels like you have to be at 60% just to hover. I've attached a shot of the curve I use for this model on 3S.

The Van   Mar 11, 2018  

Here are the cuts I had to make to lower the FC a bit further. I don't think any carbon contact is made, but I laid down some electrical tape to be sure.

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Whiffles   Mar 26, 2018 

Is there still carbon on the right side there? Seems like the structure might be affected by that cut.

The Van   Mar 27, 2018 
1

There's maybe 1mm of carbon left. I was really nervous about making that cut.. and like someone mentioned, I could very well have just removed the connector from the board instead.

That being said, with a 3mm base plate on something like this I don't think it's lost much in terms of durability!

The Van   Mar 27, 2018 

pazifist I used a dremel tool with a cutting bit. Marked the cuts with sharpie and using a tabletop vise to grip the base plate (Also I put a rag between the vise and the carbon), made the cuts carefully and incrementally. Keep the FC nearby (but probably away from carbon dust) so you can keep checking as you go. Good luck!

Burning North   Mar 12, 2018  
1

What a gem of a build! Would love to see the HD footage when you take it out for a spin. :)

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Pimpmykwad   Mar 23, 2018 

Can you give us your YT Channel please ??

The Van   Mar 23, 2018 

There are a couple more clips from this build since I last posted here. Though, it's proven difficult to get a really nice tune (I think it's because of these motors). Also, I've had some issues with the Split Mini not recognizing SD cards. Runcam's solution is to put tape on the card, essentially to press the contacts together.

Pimpmykwad   Mar 19, 2018  

Very nice build!! love it!!! can you give the weight of this wonder?? ;-)

The Van   Mar 23, 2018 

Thanks! All up is 147g with a Tattu 450mah 45C 3S, Dry weight is a little under 110 :)

Watsamatta   Mar 13, 2018  

Awesome build! If i may ask, why a JST connection on the battery lead and not an xt60 ?

The Van   Mar 13, 2018 
1

Not sure what you mean, that's an XT30. An XT60 would look pretty funny on this!

QuadStar Drones   Mar 11, 2018  

Really nice! I agree: battery on top makes the most sense, looks like it puts CG right at center of thrust :) I still need to try a micro - probably this summer.

UnderDawg   Mar 11, 2018  
1

Nice build!! I would love to see some flight footage.

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