I've upgraded to a stronger battery and newer more powerful engines, but I also had these problems right out of the box. It seems that when I have the helo 0in a hover, it "dances" back and forth and from side to side. I don't know what's causing this but it makes flying it a pain. What can I do to fix this?? Also, when I do manage to get a nice hover, when I ask the helo to make any kind of movement, the engines seem like they want to give up and I end up with a slight power loss resulting in the helo falling to the earth. Now, I do recover before it hits the ground, but it just seems like this isn't something that should be happening. I made some slight adjustments (like the manual said) to the 3-in-1 to try to control the small amount of tail spin that I always hear people talking about, but nothing else. I really enjoy the cx2 and I want to get better at it and won't give up, but right now it's more of a pain than anything. Help......please!?!?!?!?!

By dances back and forth, how much do you mean? It will always move a little, helis do not stay in one spot long. They will usually move around but should stay within a 1 foot area if balanced properly.
As for your loss of power, when you spin the heli left or right, one motor will spin faster. Particularly when you spin to the left the heli will usually drop a little, not to the floor, but a foot or two depending on how fast you spin it.

Now some common problems which are all over this forum:
1. Blade Balance: Check to see that your blades are balanced. Do this by hooking your blades together off the heli and then placing them between two soup cans on the control knubs. If the blades tip one way, put tape on the opposite side till they sit level

2. Make sure there is free movement between linkages and balls on blades. Sometimes there is flash there. Might need a little sanding. Put a small drop of oil there too

3. Check gear mesh, should not be too tight or loose between motor and gears.

4. Bent shafts? Make sure your outer and inner shafts are straight, they bend easy from a fall or mild crash. Push your left control stick to one side and spin up slowly so only one blade spins a little to visually see

5. Fly bar straight? Does it bind?

6. Tracking: Do the blades track the same? Adjust by turning the linkage on the top flybar


How many hours are on it? Motors only last so long, mine gave out after 300 flights or so.

Let us know how it works.

Yes, please expain this "dancing" some more. It almost sounds like a servo glitch problem I was having a while back.

All of the items pointed out above should be checked as well.

Was it flying fine before your upgrades?
Does it still do it with your stock battery?
Did you break in your new motors?
What kind of upgraded motors and battery did you get?
Whats your maximum flying time?
Did you change blades?

As for the "dancing" maybe the lower main assembly might be loose.

Well, if it's supposed to move like that within a 1 foot span, than I think it's okay. By "dancing", I mean that it rocks back on forth, it will fly forward about 8 inches, then fly backwards about 8 inches, almost in a rocking chair pattern. Sometimes it makes flys in circles without any stick movement. What do I have to do to break in my new engines. I'm new to electric flight, so this is all brand new to me!! Thanks for the help!! As for some of the other things: I haven't changed blades, it still did this with my old stock motors, max flying time is between 10-15 minutes but I can't do much flying right now because I have to fight it to keep it on track. I've tried to trim the radio out, but it still moves even after I've maxed out the trim. Also, when I give it left rudder, it moves really slowly, but right rudder is fast as normal. The heli doesn't have a lot of hours on it, all in all, I would say it probably only has 1 hour on it.

sounds like some sort of uni-directional tbe, like when you've almost got it gone, but not quite

is this a stock flybar - if it isn't then try one and see what happens - heck, i'd try one anyway as 90% of the problems are always in the blades or flybar - if that doesn't fix it check the shafts,some binding maybe from the lower hub bolts?

to see if its a tx problem, you could, although a bit dangerous, disconnect the servo to swash linkages and see what it does - if it quits rocking you know the servos were fighting each other or something else, if it flies off at a hundred miles an hour and crashes into a tree, well, it wasn't the tx


edge

It's sounding like you may have a flybar that is binding and probably a little bent. Check for proper operation of teh flybar. It should be loose enough so that you can flick it with your finger and have it bounce up and down a couple of times. Another thing to check is blade balance. Have you done that yet?

You do not strictly HAVE to break in new motors, though it's better if you do. With your other problems, let's leave that aside for now.

10 - 15 min. flight time is great! It's hard for me to believe that you're having all of these problems and yet you're getting more flight time than a lot of us with perfectly operational Helis....

It is normal for the Heli to turn (yaw) faster one way than another, though with your prop mix pot properly adjusted and with a fresh LiPo, there shouldnot be that much difference. Try this, put your Heli on a surface clear of othe robjects, like a workbench or kitchen table. Turn on Tx and plug in battery. SLOWLY raise throttle until one of the shafts starts to turn. Note which one it is. Ideally, both shafts should start to turn at the same time, or very close to one another when raising the throttle. If you notice a large difference between the two, then your Prop mix pot on your 3-in-1 unit needs adjustment.

The bottom line is that flying a Heli does require that you actively control it. To get one of these Helis to a true hands-off hover can be done, but it takes a lot of tuning and perfect parts.

Since you are new, have you read these links yet. If not check them out. They will help you get your heli tunned for hands free hovering.
I remeber that I've had that "rocking chair" effect before but I can't remember what caused it. I think it was my lower head assembly scews and swashplate were off.


http://www.heli-max.net/mediawiki/in..._and_CX2_Setup

http://www.dacaur.com/bladecxhelp.html

http://www.rcgroups.com/forums/showthread.php?t=642401

Please remind me what the problem was when you find it.

Thanks a lot of the help guys, I'm going to go and check all this out and see what I can come up with!!!!

Alright, when I power up my blades, I noticed that I have a slight wobble in the top of the shaft. Obviously this means that my shafts are bent. Should I replace both of them at the same time? Also, what all do I need to buy when it comes to replacing them??

Oh, and eat2muchrice, Thanks A LOT for those links, they really really helped a lot!!! And also, my dog did the same thing when I got mine. But still, he wonders what that strange thing floating in the air is when I'm flying it!!!! Thanks again!!

Another thing to check is your upper blade tracking, have a look through the illustrations in the manual and it will show you the basic steps to get your tracking correct.
Does the wobble stay constant or does it get worse when you throttle up? Sometimes an imbalance with the upper blades can cause a wobble, adjust your blade tracking first then check the wobble. If the wobble remains ensure the upper bearing is seated correctly on top of the outer hub, if it is then replace the inner shaft. If you have a 3in1 you obviously have the latest version of the CX2 with the aluminum upper hub. You should be able to pick up an new inner shaft without the upper hub for around 4 bucks.
Let us know how you make out.

Well, I acutally noticed the wobble when I barely powered up the bottom blades. I wanted to see how long it took for both sets to start spinning at the same time (which was only one click on the throttle) but when the bottom was spinning by itself is when I noticed the wobble. When I power up past that, I can't really notice the wobble at all.

Another question, what is the best way to deal with the wires from the motors. They're pretty long, should you leave them that way and just zip tie them together?? Thanks for all the help to all for getting my bird in tip top shape!!!

I zip tied mine.

I zipped tied my wires up onto the bottom of the 3-1. It allows better airflow throught the canopy.
If you have slight wobble on the inner shaft its OK. If you buy a new one then it too will be bent in no time. Its almost impossible to get them perfect.

Sounds good, I likes the way that looks too, keeps it all away from moving parts!! Thanks for all the help, I'm sure I'll be on here again in a few days with more questions. I'm off on Wednesday, so I'm making the CX2 day!!

try to loop it (just kidding)!!!!!


edge

Alright, so now I'm an avid reader of these forums, I blame all of you!!!!!!! Just kidding, thanks for putting out such great information on these forums, it's a really great help. I'll be toying around with my cx2 tomorrow and implementing a lot of the things that you guys have said and hopefully by the end of the day, I'll have a cx2 that behaves itself!! LOL

One question I have though....now keep in mind I won't mess with this unless I have to, but I always see people talking about gearmesh. What exactly is this? I figure that it's the wire bundle thing inside the moter, but not sure. Now, what exactly do you do to this to modify it?? Remember, I won't mess with it, just curious. Thanks!!!

gearmesh is the pressure of the pinion on the shaft of the motor contacting the drive gear on the shaft (in the cx, there are two of them) - hard to see unless you have a modded battery tray i guess - unless the motor has been messed with or replaced, the gearmesh will usually be ok

too much pressure is bad, so is too little




edge

Well, I did upgrade my motors to a more powerful one. At least I hope it is and I didn't get ripped off. Either way, I changed out motors, so is the gear mesh something I need to look into?? If so, how do I do it and what am I looking for??

it's not really that adjustable on the cx2, more done by off-center motor screws than by mistake (unless you get one that has the motor mount holes dremeled out and intentionally elongated) - just make sure the holes the motor screws go into are aligned straight up vertically with the holes in the motor and it should be fine


edge

Good to know. The one I bought was brand new so it shouldn't be a problem. Thanks for the help!!!

Alrighty guys, here's what's up. I finally had time to take my cx2 apart during my Christmas time off and here's what I found. Turns out that my inner and outer shafts aren't bent, thank goodness!! My flybar was ever so slight bent at the tips, probably from some of my *fine* landings I've had so far... I bent it back to what appears to be straight, at least it rolls flat on a flat surface. I do want to replace it though, I've been reading some of the things on flybars in here and it all seems very interesting. Is lighter really better?? Anyways, what flybar do you recommend?? I would like to replace it, just want to know what's good and what to stay away from!! I ordered my heat sink and the heat gel and put that on and opened up my 3-in-1 and vented in with some holes in the case. Seems that everyone recommends this, so I went ahead and did it. I'm going to be working on venting my body so it allows more air into the motors for cooling, but don't know what I want to do. I want it to be effective, but still look good. Anybody have any suggestions or pics to share?? Oh, and one more thing, see if this might have been the cause of some of my problems. I was reading a reply in one of the posts and it was saying that when all your controls sticks and slider knobs are centered, your servo arms and linkage should be at a 90 degree angle with the swash. Well, turns out my elevator arms was off by one click and was causing the swash to lean a little bit. I think that was the reason I couldn't get my heli to stop flying back and forth at it's own will. What do you think?? Well, I loosened the screw and moved it up a notch and now it's at a 90, tightened it up and now it looks like it should. Haven't had a chance to fly it yet to see if there are any changes, but hopefully I will have some success. Wish my luck!!

Please don't forget, what are your recommendations for flybars and venting?
Also, I was looking into getting the folding blades and found this: www.bladecx2.com It's under Step 1 upgrade.

Thanks for the help guys, you've been great!!!

Couple of things. That site is not recommended by any of us. May I suggest Jamie at Boomtown Hobbies. Great service, excellent pricing. His website is somewhere in this forum.

If you shorten/lighten the flybar, you get more maneuverability, but less stability. It's a tradeoff. The most efficient way to modify your flybar is to read this link, and go from there. I followed his direction, and love the mod. I've moved my servo arms out one hole, and done the flybar mod. For me, it's a perfect tradeoff of stability/maneuverability and for me, great for indoor and outdoor no wind/2-3mph MAX wind.

All props to Soloboss..

http://www.heli-max.net/mediawiki/in..._and_CX2_Setup

Here is a new venting project I'm working on. It might give you some ideas.
I used a dremel disc, razor blade and files.

Awesome!! Thanks for the pic's, I was actually thinking about something like that myself because I think the cuts look really good like that!! Won't try to copy your's but might do something similar...

Thanks for the link lse, I think I have that one, but just in case, thanks again. I will have to go back and read up on it again. Should I investigate purchasing another stock flybar just in case this one bends really bad or breaks, or is there a better one out there!!

Also, thanks for the heads up on that site. I was actually about to purchase that setup, but I'm glad I asked first. Now, I see a lot of people talking about folding blades. Are they really a good thing to have?? I know that they help in the moment of a blade strike, but it probably helps with storage too I would think. Correct?? If you find the link for Jamie at Boomtown Hobbies before I do, can somebody post it for me. Thanks again!!