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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › Tx program mix and The FU CGY750 allowed/possible?
12-05-2015 01:51 AM  34 months agoPost 1
Yeager

rrApprentice

Lisbon, Portugal

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Gents,

Is it acceptable to do Transmitter "program mix" (as JR Propo calls it) to mix minor control inputs like ELEVATOR-)PITCH together with the CGY750?

Thanks.

Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas.

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12-06-2015 04:59 AM  34 months agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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Except for tiny amounts for precision hover work, no you cannot because the gyro builds heading upon the mix resulting in progressively greater effect. All mixing has to be in the 750.

Tell me more about what you are trying to accomplish.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-07-2015 01:29 PM  33 months agoPost 3
Yeager

rrApprentice

Lisbon, Portugal

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Hi Ben,

Many thanks for your reply.

I'm setting up multi blade heads on some of my helis.

You may know, or recall, that on the older Robbe Novas/Cuatros/Millis etc, they were using a mechanically 45 deg. offset system, called System 88, where the servos rock with the collective pitch, it is a mechanical mix, so there is no need for electronic mixing with respect to this.

Now, there is a minor "interaction" between the elevator input and the collective pitch, whereby when introducing full elevator (up or down) the "interaction" results in a slight collective pitch decrease, which I am almost able to remove by introducing transmitter (JR 11X) program mix (ELE->PIT).

I was exactly concerned that the Tx program mixing would not work when introduced with the CGY750.
I did try and play with the CGY750 features, instead of the Tx program mix, but I did not seem to archive any visible movement on the swash plate. Possibly because my CGY750 is setup as "Normal" swash plate, which should be the correct choice as it is a mechanical mix.

Please let me know your thoughts, many thanks.

Claus

Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas.

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12-08-2015 02:05 AM  33 months agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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Claus,
You're kinda stuck here because you need pregyro mixing for ele>pit which the 750 has, but only in a eccpm mixing swashplate mode. Is this model for scale or sport?

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-08-2015 02:23 AM  33 months agoPost 5
Yeager

rrApprentice

Lisbon, Portugal

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Hi Ben,

It's for sports flying only, and soft multi blade sports flying like big loops and rolls etc. that is, so I'm really not too fuzzed about the minor mechanical interaction, and I actually think that the CGY750 may even be able to correct out that mechanical interaction itself (WITHOUT any mixing on the Tx, as discussed). Correct me if I'm wrong, but wouldn't the 750 interpet an uncommanded (pilot) mechanical/linkage input as an external factor and thereby try and correct the input?
In the case of my helis, that's the minor uncommanded mechanical collective pitch, when pilot commands elevator ( up and down ).

Many thanks for your time, Ben.

Cheers,
Claus

Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas.

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12-08-2015 04:10 AM  33 months agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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Claus,

To an extent you are correct for cyclic>cyclic interactions, bit since the z axis collective interaction is not stabilized, the gyro won't correct for the collective change. As noted though, the fact that collective will likely be manipulated by you at the same time as any full elevator command, it's not likely to be a problem for you.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-08-2015 05:50 AM  33 months agoPost 7
Yeager

rrApprentice

Lisbon, Portugal

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Ben,

So just for my confirmation. Do you think that ELE->PIT (collective pitch) program mix on the Tx would make any difference/influence to to CGY750 manipulations/algorithms as the resulting mix is only a manipulation of the collective pitch axis (swash plate moving up/down) and not a manipulation to the lateral and vertical axis'.

Once again, appreciate your time in helping.

Cheers,
Claus

Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas.

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01-07-2016 05:38 AM  32 months agoPost 8
Yeager

rrApprentice

Lisbon, Portugal

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Dr. Ben,

I see that you're obviously busy on another thread (the V2.0 update), so no rush to answer here, just when you have a minute.

Do you know if the updated (V2.0) version of the CGY750 has changed the possibility/option of doing "..pregyro mixing for ele>pit.." in the "NORMAL" Swash mode?

Once again, thanks for you time and effort,
Claus

Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas.

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01-07-2016 06:20 AM  32 months agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

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Lemme check on that.....

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-07-2016 07:47 PM  32 months agoPost 10
Dr.Ben

rrMaster

Richmond, VA, USA

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Do it. It'll work for the reason you theorized.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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