Help me and my cx2

[JESSTER02]

I got my first heli about 2 weeks ago i can't seem to get it aligned. The trims don't adjust enough and the proportional mix trim and gain adjust to much. it is balanced and every part is functioning properly, but it moves when i'm trying to hover. The hobby store said it is impossible to keep one hovering in the same general spot, but i know thats not true because i've seen youtube videos of cx2's that are being flown perfectly. Please help and just for my knowledge what is the gyro and do cx2 have them?.

thanks,[/quote]

[rufusis]

Re-read your manual. Make sure your upper blades are tracking right. I assume you are hovering indoors. I was trying to fly one day with the stereo cranked up and couldn't hear my box fan still running. I couldn't figure why the little heli kept freaking out until I turned the music down. LOL. The gyroscope is the mechanism that allows the bird (and you) to maintain it's tail orientation. I won't explain exactly how it works (you'll get a much better answer if you look it up) but the CX2 has one. Also, I use a 3/16 spacer to nudge my battery back a little further in the tray, mine balances better this way. "Perfect" hover does still require almost constant, minute stick input.
Good Luck!

[DaveR]

Alright, I'm a noob but I'll give it a shot.

First a couple of questions. When you connect the battery, are you waiting for the controller to initialize before moving the helicopter? Have you checked tracking of the upper blades? if they aren't tracking in the same plane, you could have some trouble. Adjust the ball link attached to the flybar until the blades track in a plane. Did you try balancing the blades? Is the swashplate levelled?

Even when you have all that stuff taken care of your helicopter is unlikely to just hover in one spot. There will be "terrain" induced turbulence esepecially in a room with furniture. The helicopter will be stirring up the air and the air currents will be changing as long as the rotors are turning. This in turn will change the conditions the heli is flying in.

Even the helicopters you see in the video clips are being controlled as they are being flown. It is unreasonable to expect any helicopter to hoiver without moving around some. You need to always be flying it. This means you'll always be making at least small control inputs.

Oh, and yes, I believe you'll find the BCX2 has a gyro.

[Raysun]

Need to mechanically trim as follows....one direction at at time. First center all trim sliders on TX.

Trim for rotation of tail, ignore sideways or fore/back drift. Read manual, adjust rear trim pot gradually disconnecting battery each time, until heli doesn't rotate either way...as close as you can get anyway. It will rotate gradually as battery gets lower during flight.

Next trim out sideways drift..if it drifts left, unsnap right servo link from swash, turn clockwise one full turn (ie. shorten it), reconnect and check. If it drifts right, lenghten the right servo link...turn counterclockwise.

Last, trim out fore/aft drift...if it drifts back, unsnap both servo links and turn counterclockwise same amount...half or full turn, ie. lenghten them. If it drifts forward, shorten both servo links.

Eventually you will want some forward drift built in as the CX2 is just too stable to get any forward speed at all. But thats a month or so away for you.

This is easier than it looks and if done well, will give you a very good hover. Also need to do this procedure after every rebuild ( ie. post crash).

Trim sliders on TX are for fine tuning during flight, not for correcting out of trim heli. Most CX's I've seen are a bit or a lot out of trim when new, and this procedure is usually very helpful.

Hope this helps,

Ray

[rufusis]

I did not start this thread but I must thank Raysun for the info. While enjoying the CX2 I have been saving & researching for a CCPM bird. I've read the manual for the TrexSEV2 & watched some of Bob's videos. I think I have the basic understanding of the critical ball linkage set up. Somehow it never crossed my mind to apply those techniques to the CX2. Though 100 times less complex, the same physics apply. Thanks again.