RCX H250 Composite Mini quad Build thread

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Lee
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RCX H250 Composite Mini quad Build thread

Post by Lee »

Here is my write up on the RCX250 mini quad from My RC Mart.

I will be using an OpenPilot board I had lying around, and I have ordered some Zippy Compact 1500mah 35C batteries.

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First the frame.
Well I was very nicely surprised to see the quality. The carbon is well woven and the finish is slightly satin like, similar to the QAV250.
All the CNC cuts are clean. No burring. Meaning I either got lucky and they had just changed the tool, or the QC is better than the other companies frames of this type.
The pieces had a light oil over them. Not sure if this is from the manufacturing, or to stop them scratching each other in the bag.
The arms look very strong. The seems to be more material around the motor mounts. Something lacking in other companies versions.
Here comes the kicker.
This frame is only $17 !!!!! Although the price is ment to go up later.
I have thought to build my own frames, but at this price, why bother.

Only one thing let the frame down. A coupe of the metal posts had too large a thread for the screws to grip.
I had to swap the screws around a few times, but eventually got a combination that worked.

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The reason I had to wait so long for my quad to arrive, was the new 2400KV H1806 motors. These are hot out of the factory.
They are and upgraded version of there popular 2300KV motors.
Bearings feel very smooth, and the windings look very carefully assembled.
They come with two prop mounts, one for standard style props, and one for Tiger style.
The standard version come with a 5mm shaft. This negates the need for a prop adapter to shim the Gem fan props.
Warning about the screws supplied with the motors, they are too short to go through the arms.
Lucky I had some longer ones from an old 450 heli. Just be careful not to make them too long as to touch the windings.

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The ESCs are Simon K flashed 12A. I removed the ESC motor wires, and solder the wires from the motor straight to the board.
One downside to these ESCs, is the battery wires are too short for the mini copter without adding extensions to allow all wires to be soldered together.
I have opted to replace the wire completely with longer ones. I have informed myrcmart to suggest lengthening them by 20mm.

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When cutting the motor wires, I found the enamel coating goes all the way up the wire. So when you cut them to length, you will need to scrape the coating off, before they can be soldered.
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Next I will wire up the power distribution. I did start this, but got annoyed with the short ESC wires, so I'm waiting for some 18AUW wire to arrive with my batteries.



So I'm going with the single Gopro as my Recording and FPV cam.
The is zero lag when testing on the bench, so it should work fine as FPV.

I had a spare piece of carbon, the same width as the arms.
It came from my Goblin 570, used for a separate Gyro sensor, if you have one, which I don't.

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The frame kit comes with some useless flimsy landing skids, that nobody uses.So I made my own.
These are standoffs from a Trex 600 tail boom case.
I cut them in half and screwed them to the legs.

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Ok all finished :D
If I can give anyone some advice with building these mini quads, it would be to use a Power distribution board.
The air was think with bad language today, trying to solder all the wires together.
So much easier with a PDB, but I got it done eventually :D

I replaced all the ESC wires with longer ones to make bundling the wire together more easy.
Then instead of Heat shrink tubing, I use balloons to cover the ESC as a temporary measure until the new heat shrink arrives :D

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Wiring is a bit messy at the moment. I will tidy it up once I know everything is working properly.
Gopro with FPV cable connected
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Rear has blue LEDs Looks like a space craft when flying away from me.
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All setup and ready. I did take it for a test flight tonight, but it was pitch black, so the video is useless.
With the Open Pilot CC3D set up with some settings I found on Luminiers website for the QAV250, it flies pretty good.

With the 1500Mah 35C Zippy compact, I got 7mins on the test flight. Still had 3.74V per cell :D

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Last edited by Lee on Fri Nov 21, 2014 12:08 am, edited 2 times in total.
GOBLIN 570------IKON
WARP 360--------IKON
QAV 500----------Open Pilot
RCXH250---------Open Pilot


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Tony
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Re: RCX250 Mini quad Build thread

Post by Tony »

Wow Lee, that is a great build thread mate.... Do I see an orange RX on there....
Tony - AKA Blackwarrior - nice to be home again
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HK450 FBL - Hubsan X4 - RCX H250 FPV Quad with Skyzone goggles..
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Re: RCX250 Mini quad Build thread

Post by cml001 »

I want one.. But I've got to finish up the 2 projects iv got goin first.. But I really want one.
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Re: RCX H250 Composite Mini quad Build thread

Post by Stambo »

I found the same thing with the standoffs on my Banggood 250 frame.
Luckily I had some slightly longer screws lying around.
As for motor screws, my motors are zip tied on. :)
Something to be careful of with those ESCs.
Using a balloon instead of heatshrink is really thin.
Zip tied to a conductive carbon arm is a recipe for disaster.
With all the vibrations that can go on the balloon may wear through fairly quickly and the ESCs short on the arms.
I have used rubber bands wrapped around my ESCs multiple times to secure mine.
One thing that is undeniable, these things are loads of fun to fly FPV.
RCX 250 Minquad FPV addiction
500 X quad FPV/AP platform
450 X quad set up for night flight
Multiple WLToys V911, V949, V959
Taranis, Turnigy 9X
Fatshark Predator, Immersion 5800 Duo
Trex 500 Esky Belt CP V2
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Lee
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Re: RCX H250 Composite Mini quad Build thread

Post by Lee »

Balloon was just temporary mate until i got the new heat shrink. You'll see them in the other 250 thread.
The second frame had no issue with the standoffs :)
GOBLIN 570------IKON
WARP 360--------IKON
QAV 500----------Open Pilot
RCXH250---------Open Pilot


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Re: RCX H250 Composite Mini quad Build thread

Post by Stambo »

Hey Lee, I hope those 1500 35c Zippy compacts work ok for you.
I have been reading lots about them not being up to scratch.
I am using 1500 and 1800 25c and they seem to be ok but my friend got the 1500 35c and found they did not perform as well as my 1500 25c.
There may be a bad batch out there somewhere as I have had nothing but success with all the Zippy's I have used.
RCX 250 Minquad FPV addiction
500 X quad FPV/AP platform
450 X quad set up for night flight
Multiple WLToys V911, V949, V959
Taranis, Turnigy 9X
Fatshark Predator, Immersion 5800 Duo
Trex 500 Esky Belt CP V2
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Lee
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Re: RCX H250 Composite Mini quad Build thread

Post by Lee »

Mine seem to be fine.
Well balanced.
What problems have people had?
GOBLIN 570------IKON
WARP 360--------IKON
QAV 500----------Open Pilot
RCXH250---------Open Pilot


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Stambo
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Re: RCX H250 Composite Mini quad Build thread

Post by Stambo »

Lee wrote:Mine seem to be fine.
Well balanced.
What problems have people had?
My friend Rob got 3 from Aus warehouse and all of them had limited flight times (less than 2 minutes before low voltage alarm)
and one low cell on recharge. I have seen similar complaints on HK web site.
I get about 6 minutes from my 1500 25c but that's not flying hard, they are probably not going to last.
I also use 1800 25c and they give me 8 minutes plus.
No real point in going back to HK as the return shipping would probably be more than the price of the batteries.
I thinking maybe we pull them apart and build 2 good ones out of the 3.
RCX 250 Minquad FPV addiction
500 X quad FPV/AP platform
450 X quad set up for night flight
Multiple WLToys V911, V949, V959
Taranis, Turnigy 9X
Fatshark Predator, Immersion 5800 Duo
Trex 500 Esky Belt CP V2
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Lee
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Re: RCX H250 Composite Mini quad Build thread

Post by Lee »

I got mine from the EU warehouse, and Tony's from the HK one.
All are balanced well. The internal resistance is pretty high though at 10ohms
Compare that to my Revolectrix packs that are 0.9ohms.
But they seem to run well at the moment. I fly 5 mins of fast acro flying, and they come down cool and 3.8V per cell.
GOBLIN 570------IKON
WARP 360--------IKON
QAV 500----------Open Pilot
RCXH250---------Open Pilot


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