CX2 Nose Heavy?

[etm]

My CX2 was nose heavy and was trimmed to compensate for it when I took it out of the box. I tried to move the battery back to balance it but I would need to leave about 75% of the battery sticking out from its rack to achieve a correct balance. This is not practical as it is difficult to secure the battery in this position and it makes the lipo relatively exposed to shocks in crashes - plus it does not look cool. I ended up attaching a metal binder clip at the end of the boom, but this adds some weight to the bird and it increases inertia in pirouettes with all the weight at the far end of the boom... I am getting a carbon boom but my guess is that it is not going to be any heavier than the stock plastic tail and will not solve the issue.

Have you had the same experience with the CX2 and how did you solve the issue? All the components are at the right place, so I assume all the CX2s exhibit the same nose heavy characteristic. I am contemplating keeping it nose heavy and adjusting the trims to compensate, pretty much as it was delivered. Not a totally satisfactory solution...

ETM

[carlo_the_wonder_frog]

Have 3 Cx's, not a single one ever exhibited a forward CG. I don't see how its possible either unless they built it wrong. Have you tried to put the battery all the way forward, remove the binder clip and flown? Try it and use the trim, it will fly best that way.

[etm]

This is really weird indeed. I need to move the battery back by 1.5 inch in the track to achieve balance. All the components are in the right place (tough to build the heli otherwise..) I can only think of motors that are heavier than they should be.

If I trim the heli to negate the forward drift, it will fly fine - a little sluggish for tail-in flying and a much happy camper for forward flying as we can imagine. It also hovers more easily with proper balance. When trimmed correctly while nose heavy, the elevator servo has too much range for the swashplate motion when pushing the linkage down but this has no effect on flying abilities.

I am puzzled..

ETM

[etm]

I replaced the stock plastic tail with a carbon boom (ESPH1000 made by esp hobby mfg.) and this solved the issue. The boom's weight of 17grms is enough to make a huge difference. The empty plastic shell of the stock tail weights probably nothing.

The boom looks good and I will have less wind drift. I am happy!

Note that I had to replace 3 of the provided mounting screws and reglue the support rods when installing the esp hobby boom. The quality of the hardware is poor but the end result is fine after those replacements. I also added two small nylon washers to better secure the boom mount to the CX2's shaft that holds the rear of the canopy and boom (the mount is too wide and would have a lot of play with the heli frame otherwise).

Eric

[heyjack8]

i would try unhooking your servo linkage from the swash plateand turn out the little hook ups two full turns to try and compensate for nose heavy and get your servos better hooked up to your trim tabs i had to adjuts mine in order to make my heli hover a bit better.....also your swash plate will not always be in the level position at hover because of weight charateristics of your particular aircraft...it does take some tinkering to get the cx2 to hover out of the box...but evan at best your gonna have to make small inputs because of voltage drops and battery specifics..... any way thats my two sence worth hope it helps....my extream tail made a huge difference in the way te heli flew so i had to re calibrate 3in one also whe i installed it as well as fine tune servo linkage