I have been flying the CX2 for about a month now and have always had problems with yaw. Since this is my first helicopter I don't know if the problem is me or the machine. I thought the whole idea of a gyro system was to keep the heli on a heading until commanded otherwise. I find myself constantly adjusting the trim to keep the heli pointed in one direction. I'm not talking about the slow change caused by heat. I mean every 10 seconds or so. I get it up and hovering, and as I start forward motion the heli begins to yaw. I correct the yaw, and I notice the heli starts to drift sideways. In the time it takes me to correct that, it is yawing again. I have worked with the gain and proportional adjustments, but it didn't help. Is this normal, am I expecting too much from the gyro system, or is something wrong?

My second problem. I replaced the plastic head inner shaft with the aluminum one. While I had it apart I lubed the inner shaft and gears, but I could not lube the outer shaft because I was not sure how to get it apart and put it back together again. Now the heli yaws left even though I have the trim all the way right and the proportional all the way clockwise. Could this be because I lubed the inner shaft but not the outer shaft? I can't imagine what else could have changed. I would also appreciate step-by-step instructions on how to remove the outer shaft and put it back together correctly. Any help you can offer would be greatly appreciated.

There are several things that can cause the heli to rotate. If you like, I'll send you a paper that I wrote explaining many of the heli functions, and setup tips for the heli. It's lengthy, but it may contain an answer or two. If you want a copy, send me your email address.
Mark

Thanks, I would appreciate that. You can reach me at [email protected]. Could you also include the procedure for removing and replacing the outer shaft and head? Thanks again.

Hi Mark...say your post about a paper on CX2 flight characteristics and would like a copy if not a big hassle...my email is [email protected] thanks, John H.

Me, too! Please. . .

[email protected]

Thank You !

Solo gave this to me to post here it is for everyone.


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

DY

Hey, just a quick thought on your yaw problem, you said you lubed up the inner and outer shafts, Make sure the gear on the bottom connected to the inner shaft has the screw properly fitted into the notch at the bottom of the innter shaft. If you lubed it all up, which really is not necessary unless your having some issues, that gear could be slipping. A small slip could allow the heli to fly but stop the top rotor from turning at the proper speed, causing yaw issues. Just a thought.

marrec159,

I lubed the inner shaft but NOT the outer shaft, because I can't find information on how to take the outer shaft apart. I was wondering if this could be the problem causing my excessive left yaw that I can't get rid of.

Soloboss,

I appreciate the info you directed me to, but it did not solve my two problems. Could you please look at my original posting and see if you have any suggestions? Thanks.

The outer shaft comes out through the bottom of the heli. Remove the rear body and front canopy first. Then remove the blades and the inner shaft. I always lay parts on a towel in the order removed to ease reassembly. Next remove the battery tray and skids. You then take the upper bearing cup holder and bearing off the top of the outer shaft, then remove the lower rotor hub taking out the 4 screws. Note that on the top set of screws, they have to go back in the holes in the outer shaft. Loosen the retaining collar on the top of the upper Main shaft bearing block. Gently slide the outer shaft out thru the bottom of the heli. Some times there is a burr or a slight jag on the outer shaft, you may have to sand or file the offending metal bit before the shaft will slide thru the bearings. There is a bearing that holds the inner shaft straight and keeps your spacing between gears in the bottom of the outer shaft. Usually it stays in place and you don't need to worry about it. I had it fall out on mine once, and spent 2 hours figuring out why the gears were binding and slop in the inner shaft. While you have it out, be sure to check that its straight by rolling it on a known flat surface with the gear hanging over the edge. If not straight, follow solo's instructions on how to straighten it. I always lightly polish the outer shaft with 600 grit wet dry sandpaper, and have heard guys using steel wool to finish it off. when ready to reinstall, use a light coating of your preferred oil on the shaft and bearings. that should get yo where you want to be.

Consider that one of your motors is not quite as strong as the other one as a possible cause of your continual Yaw. Not sure how many flights you have on that heli, but those motors do wear out. Also consider gear mesh on both gears,,,,,,,,tight? loose? Keep in mind, there are a number of factors that can baffle all of us, solo's process of elimination is quite detailed and pretty much covers all but the most complex troubleshooting issues. Good Luck, Roll up your sleeves, and keep firing, eventually the target will get hit!


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Of all the things I ever lost............................................ I miss my mind the most!

PROBLEM SOLVED! Thanks everyone for the input.