Setting up controls on ERGO 30 CCPM Helo

I am attempting to set up an ERGO 30 CCPM along with a JR XP652 Transmitter. Here is my situation. Following the instructions in the manual I have the throttle/collective at mid-point on the transmitter. I have the swashplate nice and level. All the flight controls appear to move nicely and evenly as long as I am above the halfway point on the throttle/collective on the transmitter.
Once I move below the halfway point, the swashplate lowers unevenly. When it bottoms out, I have about a 5 degree slant towards the right side of the helo. The manual describes setting up at the 50%/halfway point. Nothing below or how to correct this.
Can anyone help me through this?

[darren_uk]

Hi Ignatiussr,

I'm not familiar with the Ergo (I have only had one model heli, my trusty Shuttle).

However, what you've said does seem incorrect (or maybe it's a design feature - someone else correct me?)

The aileron and elevator servos should be the ones that tilt the swashplate. The collective's only job is to collectively increase or decrease the pitch on all the blades at once - and one way it achieves this is to raise or lower the swashplate. It certainly shouldn't be tilting the swashplate in any way.


If this were me investigating the problem on my helicopter: When I raised/lowered the collective, the only servos that should move are:
Collective
Probably the throttle too (throttle mix)
Possibly the tail rotor too (revo mix I think it's called).

If my aileron or elevator servos also moved, I'd consider this an incorrect setup (perhaps I've plugged the servos into the wrong sockets on the receiver? For example, maybe I've plugged my aileron servo into my tail-rotor output? If you move your tail rotor control then this will eliminate this possible cause if you see the tail rotor move correctly)

I'd also watch carefully the interaction of the push/pull rods that connect the servos to the various bits and bobs: perhaps there's something touching, and maybe pushing the aileron connections hence tilting the swashplate?

Or maybe it is a design feature? Check with Ergo users on other boards (e.g., http://runryder.com/ seem to have lots of users)

I believe that the servos are connected to the receiver correctly. Above the halfway point on collective/throttle, the two servos mounted on the sides move evenly, left/right, fwd/back.
It appears that the travel of each left/right servo is different below the halfway point. I am just starting out so I am not real familar with all the settings on the transmitter. I think that there is a setup procedure for travel of each servo above and below the halfway point. I followed the instructions in the ERGO manual for initial set-up. Both servos are centered when the collective/throttle stick is bottomed out. As I increase collective, the right servo moves up and, at the halfway point the swashplate is level and then both servos travel evenly as required.

[darren_uk]

Hi again,

Your setup is new to me. On the Shuttle, only one servo raises and lowers the swashplate. This is the collective.

Then there's one servo for the aileron, and one servo for the elevator (aileron tilts left/right, elevator tilts forward/back).

All three servos are independent of each other.

Let me just look at your post in more details:

From what you've said, it sounds like there is no separate collective servo, but rather the collective is controlled by the aileron and elevator servos? Can you clarify this?

"It appears that the travel of each left/right servo is different below the halfway point"
'each left/right servo'? But there's only one servo for left/right (the aileron servo) right?


I think you're right, there could be different rates of movement (and things like exponential rates) for the servos. I've got an XP642 which is almost the same as yours (you've got a few additional things on your radio).

I've got to dash out now, but if you can post a reply addressing my queries above, I'll see if I can visualise better what could be going on.

(and when an Ergo flyer sees this thread, all will be revealed no doubt!!) Chat later.

Here is what I understand. With a 120 degree CCPM swashplate, power inputs change all swashplate servos (let's leave out throttle and tail rotor). As power is increased, all three servos move up or down evenly. When a turn is input only two servos should move simultaneously, one up, one down, and the front elevator remains still. I pretty much achieve all of this when the collective/throttle is above the halfway mark on the transmitter. It's interesting that you mentioned exponential rates.

[darren_uk]

Hi again,

This is out of my league - I'm not familiar with CCPM (I've only this week come across these 120degree swashplates)

We both need help from someone else with more knowledge.

Anyone??

(also, another board that might be able to shed more light (simply because they have more numbers) is: http://runryder.com/

I posted the situation on runryder.com No help yet.

[colin]

Have you tried the newsgroup?

rec.models.rc.helicopters?