Pitch on DX7

[Bell 206]

I can't for the life of me work out how you centralise the pitch on the dx7 - this is making the Phoenix Sim extremely difficult! When I look at the status window in System Mode of all the respective channels, the Pitch is either way off to the left, or right depending on how I set it up on the Pitch Curve - never centralised!?? The only heli that has been reasonably stable has been the Hughes 500 turbine... With the pitch turned off (via the curve) on Norm setting, the heli's just yaw uncontrollably to starboard when even small amounts of Collective are applied...

[robgt]

Do you have a linear pitch curve.
Points 1 to 5 being 0%, 25%, 50% 75%, 100% respectively?
Cheers,
Rob

[Bell 206]

Yes, I do now, but is this meant to be concurrent with Throttle?? I'm not sure as I understand the concept of Pitch on RC and am not afraid to admit it - please explain someone!?! Collective/Throttle, yes, but Pitch/Throttle????

[robgt]

Collective = Pitch
No worries!!

As far as setting up the Tx for the sim goes, all you have to do is use a blank model memory setup to use "1 servo 90°" which equates to mechanical mixing. This is set in the "first" menu which you access by switching on the Tx while holding down the bottom left two buttons (Select and the down rocker switch).

From there, you can set everything on the sim software itself.

Any other questions - just ask!!
Cheers,
Rob

[Bell 206]

Of course - collective is just short for 'collective pitch' (clang)! In this case Throttle (turbine rpm) and rotor blade Pitch are combined, just the same but in RC terms. I'll set everything on the TX to the factory defaults! I have the single 90 degree gyro set via the 'first menu', but this is still seemingly causing problems. Nothing as yet set in the model memory, just Gyro set up..

[robgt]

I think there is confusion here, but getting there
The 90 degree setting refers to the swashplate setup - you would use this 90 degree value if you owned a Raptor helicopter, for example, which doesn't have 120° ccpm (by default anyway!). Whereas a Trex600 has 120° ccpm - just examples.

You don't need to worry about gyro settings or anything else (literally, nothing else - just 90° swashplate setup and that's it) .

The next set of issues are likely to be down to reversing of channels. This can all be done in the simulator.

Make sure you calibrate the Tx and test it - if it's wrong you need to figure out what is wrong and then you need to edit the Tx settings.

So, for example, if you push forward elevator and the heli uses back elevator - revers the elevator channel in the Tx setup.

Cheers,
Rob

[Bell 206]

I presume '1 servo Norm' is equivalent to 90 degree?? The only swashplate setup with a 90 degree value is with 3 servos on the DX7 (as far as I can see).

[robgt]

I presume '1 servo Norm' is equivalent to 90 degree?

Yes, thats correct.
It equates to using 1 servo for each swashplate movement (as on Raptor helicopters) - also known as mCCPM (mechanical ccpm) as opposed to eCCPM (electronic ccpm).

Cheers,
Rob

[elektromodely.com]

With the pitch turned off (via the curve) on Norm setting, the heli's just yaw uncontrollably to starboard when even small amounts of Collective are applied...

Upps, that's about the sim... Are all channels assigned correctly ?

[HiltonSteve]

Did you program a 0 25 50 75 100 curve in both the pitch and throttle curves before calibrating?

I adjust mine to this then calibrate and then put them back to my normal values.

Just a thought....

[unwind-protect]

Leave your normal (or idle up, depending on how you like things) as linear, then calibration can be done simply by selecting that flight mode.

Personally I have normal as linear throttle & pitch, and idle up as V (or flat, no difference really for phoenix as it models a governor) throttle with linear pitch. Normal is used for calibration, and I fly around in idle up all the time.

I also use dual rates to tame down the cyclic for some models for the same reason, it makes recalibration a doddle.