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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › CGY750 Ail/Elev Rate Percentages
04-08-2014 01:46 PM  4 years agoPost 1
Ironside

rrApprentice

Baltimore, MD

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When it's said to keep the Ail and Ele rates the same, can one be pos(+) and the other neg(-) [i.e. Ail+60 and Ele-60] (to provide correct direction of travel) or do I need to reverse the channel in the TX so that both numbers will either be pos(+) or neg(-)?

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04-08-2014 09:29 PM  4 years agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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Keep the percentages the same and change the sign(s) in the 750 as needed for proper direction. Do not reverse the transmitter channels.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-08-2014 09:44 PM  4 years agoPost 3
Ironside

rrApprentice

Baltimore, MD

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Did you mean change the signs in the CGY750? You said the radio.

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04-09-2014 02:16 AM  4 years agoPost 4
Olorin5

rrNovice

Taupo, New Zealand

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All adjustments should be done in the 750, not the radio.
In answer to the original question, adjust the sign (in the 750) to get the swash tilting in the correct orientation for cyclic stick input, just keep the final aileron and elevator percentages the same. This is assuming you've already set the correct combination in the ServoDir menu - refer to item (6) on page 10 of the updated CGY750 manual.

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04-09-2014 12:41 PM  4 years agoPost 5
Ironside

rrApprentice

Baltimore, MD

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Yep I've already set the correct combination. The default combo had everything moving in the correct direction other than the elevator which I then changed the sign within the 750. Both aileron and elevator are set to 60% (60% Aileron -60% Elevator) with 10° of pitch on each. Although I had already done it, I just wanted to make sure I was to change the sign in the 750 and not the TX. Thanks for the help.

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04-10-2014 01:54 AM  4 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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Sorry. Typo about in the radio vs 750. I meant 750.
Edited my post.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-11-2014 06:00 PM  4 years agoPost 7
Ironside

rrApprentice

Baltimore, MD

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Alright I have another question, I switched my Vario E-Benzin Trainer from a 4-Servo 90 degree CCPM to a 3-Servo 120 Degree setup because of binding. I set up the swash last night and ended up with an Aileron and Elevator Rate of 75% at 9.5 degrees of deflection. Looking at the manual, it states the recommended rates should be between 50-70% at 9-10 degrees of deflection. If I go down to 70% to get in the recommended range, the cyclic deflection drops to just around 8.7 degrees. I'm using the big Futaba servo wheels but it appears the only way to get the rate down to around the 60% mark and keep the 9-10 degree of deflection would be to go with an even larger servo horn. Just curious as to how others are keeping the rates down but still able to get 9-10 of deflection on the cyclic? Does it simply depend on the helicopter you're using or am I setting it up wrong?

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04-11-2014 06:25 PM  4 years agoPost 8
ssmith512

rrKey Veteran

Indianapolis, IN USA

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The mechanical geometry of the helicopter definitely plays a part. Bell crank ratios, inner and outer swash ratios and blade grip arm ratios will all be a dictating factor.

You are not so far off that I doubt the control loop of the 750 would have any serious issues, but I will have to defer to the 750 experts to comment on your particular settings. But it certainly doesnt sound like you are setting it up "wrong", sounds as if it is simply a geometry issue, which can be solved by using different servo arms, and/or if available, different ball link lengths on the swash (inner or outer) or different grip arm lengths. It's all about lever arm lengths.

Steve

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04-11-2014 06:47 PM  4 years agoPost 9
Ironside

rrApprentice

Baltimore, MD

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Would you recommend staying with the 75% @ 9.5 degrees or to go with the 70% @ 8.7 degrees? I had planned on trying the 75% just to see. My thought process was since I won't be doing 3D with this heli, maybe it wouldn't matter. I also never considered looking into different lengths on the inner swashring. Since I'm not off that much, that may be a viable solution. I'll have to look to see what Vario has available.

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