Hi.

I have some issues with my CP2 heli:

Trimmer confusions:
The receiver have two trimmers. (1)Gain trimmer and (2)Proportion trimmer. The manual instructs me to adjust trimmer 2 (Proportion, according to the manual) in order to keep the heli in the same direction when encreasing thrust. If the heli turns left or right, adjust this trimmer + or -. However, on my receiver, which is the same as in the manual, the numbers on the switches are oposite. Or have I misunderstood something? When I adjust the (1)Gain trimmer to +, the tail rotor goes faster and the heli turns right. When I adjust (2)Proportion to +, the tail starts wobbeling. Something is wrong in this manual I guess.

Pitch problem:
Another thing. If I panic, while hovering in my livingroom, I want the heli down. But the pitch does not respond accordingly to decreased thrust so the heli keeps its level long enough to destroy some furnitures and blades. I have also seen that the pitch is increased slowly and normal while increasing thrust, but at a certain level of thrust, the pitch goes from normal to MUCH in no time, and the heli suddely goes fast upwards. If I inspect the servo movements, they move smooth all the way, so I guess there is something with the plastic parts in the main rotor. If I manually force one blade to pitch without moving the resvos, it feels quite loose, and I can see that the mechanics in the swash-plate is loose (It is a small metal ball in there which have too much room - so to speak).

In the same time, when adjusting Gain and Proportion to the best possible position, the heli want to turn right until liftoff. In the air the heli is pointing in the same direction when howering. Maybe this is also linked to the pitch problem above?

What to do with this? Buy a more expencive heli?[]

Br.

Vidar

Ok maybe this will help.
Proportion = amount of motor speed as compared to pitch at a given setting.
Gain = amount of sensitivity the gyro has to tail rotation not induced by stick position.

Turn the gain down below half setting. Set the heli on a slick surface. (tile floor, concrete floor, kids trampoline) the latter works great beause it is waist high. LOL Now you need to set the proportion first and the gain second. Do a normal power up on the transmitter and heli. Tx first then batt on heli. Set on slick surface and bring heli up to speed trim centered. Get it light on the skids is all. NOW does the heli spin one way or the other. If it does you need to adjust the proportion control. If the nose goes to the right you need to turn the proportion to the right (up) until it stops. Turn it down it the nose goes to the left. NOTICE you need to pay attention to the nose not the tail. Now if you make a change in the proportion control you have to unplug the battery and let the 4 in 1 reset each time you make a change. NO EXCEPTIONS! Now once you get this set you are ready to set the gain control. Starting at about 50% or less pick the heli up in a hover and set the trim again to hold the heli straight. The gyro should be holding the tail fairly straight now if you have it trimmed as close as possible and the tail is still moving you may need a little more gain. The rule for the gain is if you turn it up too far then the tail will start wagging back and forth real fast (twitchy like). If the heli starts doing this then you need to back the gain off a tad bit. Be sure and reset the 4 in 1 each time you make a change in the gyro gain. Maybe this will help you. Give it a try and Always have fun. Gittle

OK Thanks. What about the uncontrolled pitch? It seems to be quite unstable. If i power up to 3/4 throttle, the heli starts bearly to lift off. If I push the aileron to right or left a bit, and back again, the heli suddely lifts off rapidly - like the pitch suddenly increases. So I must reduce throttle to keep the heli at the same level.

To explain the pitch problem:
1. 3/4 throttle the heli bearly lifts off.
2. 7/8 throttle the heli really lifts off.
3. back to 3/4 throttle the heli still lifts off.
4. further back to 1/2 throttle (Where the pitch is suppose to be zero) it hovers nicely.
5. further back to 1/3 throttle it starts to go down slowly.

Something is wrong here. From 0 to 1/2 throttle the pitch ends at zero at 1/2 throttle. From full throttle down to 1/2 throttle, the pitch ends positive (4-5 degrees) at 1/2 throttle.

Vidar

OK disconnect the rods going to the swash plate and move the swash up and down by hand and see if there is any tight or sticky places. It sounds like it is binding. If I remember correctly the cp2 has some binding in the head assembly. Inside the flybar mechanism. Look there for it. If it is not binding then you could have some slack in the head. I will look for the fix in the forums and get back with you. Gittle

OK Low-Q I remember the sticky collective thing now. It is in the blade grips and how the washers are arranged inside them. Disconnect the links to the blade grips and see if the rotate freely up and down. If not the washers inside the blade grips are binding. There are 2 stepped washers that are placed wrongly inside the grips. A stepped washer has a smaller OD on one side than the other and the smaller side needs to be against the inside race of the bearing. Mine were placed in there backwards from the factory and causing the same thing you are talking about. The washers need to be turner around and placed in the correct order. I will try and find some diagrams for you but, I am sure that is it.


http://www.rcgroups.com/forums/showthread.php?t=382982 Here is a link to some pics on another forum. Good Luck Gittle

Thanks for the info. Almost all washers was placed incorrectly. Now the pitch is going smooth, and the heli flies perfectly. Thanks!

Br.

Vidar