Well, I pulled the trigger and ordered a Droidworx CX4 airframe a few weeks ago. I have been researching and contemplating this build for a while now and am really taking my time...
I already have a Gaui500X which I am setting up (Arducopter) for a friend who says he doesn't have time to set his own one up. Plus he's not that experienced with electronics (soldering etc). I have so far had really good luck with the GAUI. I have recently set up flight modes in my radio and plan to test these more this weekend.
I also have some extra motors and speed controllers from udrones which I will be putting in a 450x airframe with no fancy electronics which I will use to get better at flying these multis.
I have been flying model airplanes for years and have flown a little helicopter, just not enough to consider myself any good, but I don't usually get too mixed up as long as I keep the copter low and close... To assist in my transition to multi's, I bought a used copy of RealFlight 5.5 and am using the multi they have there to get my reactions intuitive like they are when flying planes.
That did it! The nylon washers were included with the kit, I just couldn't see them in the instructions. Well, now I have a secure body!
Well, I have been flying the Gaui500X in stabilize mode for the last week (about 1-3'), and though it's a little bit of a bucking bronco (oscillating), I am feeling more comfortable with Ardu and feel ready to slowly and cautiously, dive in and start adjusting the P value settings.
I am gonna spend tonight looking in to these p value settings, as I assume these scorpion motors are a bit more powerful than the udrones motors the multi is factory set for. Any assistance would be appreciated??
I found this page with tuning tips doing a google search:
Here are some more useful links for me:
Tonight will probably connect up the MK speed controllers and check their functioning. Unless I get this arducopter dead smooth, I won't be running it in my CX, that's for sure. I have the GAUI and a basic clone framed quad to test with, so I am giving it some good time and effort. I know that I could use a different brand commercial grade controller that would not give me all the same, options, but would simply do the job without so much config..
The links above are outdated, here is the tuning link for Ardu2:
It's amazing how outdated much of the information is, I constantly have to look at comments and search to see if what I have got has been updated.. It's not that hard though:)
Well, I guess the inside term is PID values, which I am starting to modify. The GAUI500X has scorpion 960kv motors, and I am running a 3S battery with the factory 10" props.
I lowered a few of the factory values a bit and experimented with them. My last experiment had a little less oscillation, but was way sluggish, so I am going back to the drawing board.. These are good tests, as I assume the majority of those who dislike the arducopter fail to make these corrections properly. I know that I am no exception right now, but unless something crazy happens, I plan to stick with it.. Any assistance is appreciated..
I also note this latest MIssionPlanner constantly states there is an update available, I just cancel it, but I wish there was an option, "Do not automatically check for updates". This would be useful in this case, but who am I to ask.. Just noting in the case anyone who cares is reading this post..
I can't tell you how many products there are, where I read the reviews which basically trashed the product, then I somehow got myself the product, and by following the directions and applying logic and some experience, ended up noting the product worked exactly as they claimed.
Cool, I made a few changes which I saw had worked for someone else's quad airframe, and they seem to be working pretty well for the GAUI500X. I am basically making hops hovering 1-3' and noted a far smoother hover, especially over 2-3' where the washout isn't an additional issue I guess.
I set the Stabilize P to 3.80 and the Rate Roll P to .1.
It's looking like the next thing I gotta check is the Alt_Hold.. I would just rather do that with my cheap clone, but sadly, I am still waiting for the frame parts which were omitted from my kit:(.. I will probably wait, just 'cause I don't want to pay to fix someone else's airframe.
Ok, well the AVROTO motors are tested with the BL2 ESC, but I am not too impressed with these motors so far. Basically, they are advertised for A/V specialty, yet they make a lot of noise, even without having a prop on them. The AXI's are a lot quieter, simple whistle. These AVROTO have a whistle with also a somewhat gritty sound:( At least the ESC's are configured and testing working with my RADIO....:)
The gritty sound is something created by the sound passing though the carbon fiber tubes to the center plates. It's much quieter with props than without for some reason..
Well, I spent some time looking at how I can put another center plate on top of the speed controller/power distributer plate and ended up just using stacked double sided tape. I hope the tape works well for vibration too.
After connecting the APM to the MK ESC's I went ahead and tested the motor directions. I had labeled them in the default MK setup, but as soon as I fired them up, they were spinning all the wrong ways.. This was easy to fix by swapping 2 leads to each motor from each ESC.
With this squared away, I put on some props and checked the controls (while holding the multi). Well, this was another surprise as the thing would have flipped right over had I not done this in my hands. Somethings way off...
I noted that MK uses a different orientation of it's motors, so I had to remap the MK orientation to the Ardu orientation.
I then checked the controls (again in my hands over my head).
Now I do note a strange dip in the motors when I use the rudder, but I am not sure this isn't because I am using big motors on this thing... I will figure this out. Now it's time to set up the xbee's:)
Right now I am using 10x4 props and they are way too small.
I ordered some 12x3.8 props from Quadrocopter which should be in later this week..
I will get some pictures up in the next few days..
I am curious if my ardu GPS will work through my painted body or if I am gonna have to extend the leads and put it on top.. I will figure that out soon..
The GPS works just fine through the painted canopy:)
I swapped in some APC 12x3.8 props today, I don't need the power of the 12x6 props right now. I ordered these props in glass and carbon fiber. I will only use the carbon ones for display for the most part..
Well, I am very happy to report that arducopter 2.3 is a little twitchy with the GAUI500X, but today I took the CX4 out for a short skip maiden flight and am more than happy to report it is more stable than the GAUI with the factory PID settings. In fact I had not a single twitch making a few nice skips, hops and hoverfloats:)
The only thing this newb noted is that the copter tended to float a little right and back and I have to use the sticks to maintain level flight. I assume this is because the CX4 and how it relates to the arducopter APM gyros, isn't perfectly level. I immediately noticed this when starting up the motors as one always (back right) started last and finished first. Since I am a newb and this was the maiden using stabilize mode only, I clicked in about 5 clicks of left trim and about 8 of forward. I will read a lot more this week about exactly how to address this, but I am so excited about the factory PID thing I am just gonna enjoy a successful day:) The copper really looked outstanding on the grass outside.