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HomeAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › Adjusting responsiveness/pitch
02-02-2012 09:25 PM  6 years agoPost 1
mdeeRocks

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UK

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I am still on a bit of quest to make my mini protos fly as I like.
Trouble is that it's very responsive small machine and this is amplified by responsiveness of FBL system (CGY750). I can fly it like that (actually did whole season), but response is a bit too much/twitchy.

I really like linear type of response, so lots of expo (more than 10-15) doesn't really work for me.

I have tried to adjust D/R on my radio, but it doesn't really feel good, I loose a lot of resolution and precision. Adjusting Angular rate percentage on the unit doesn't have any noticeable effect

I've read a post here by Dr. Ben who recommends adjusting AFRs on the unit, just like on flybar heli. My question is, if I manage to have recommended 8 pitch with AFRs in 60+ by setting heli up mechanically, then lower AFRs to recommended 50s to get less cyclic pitch (approx 6) and lower roll/flip rates, would CGY750 still work optimally having only 6 pitch range?

Thanks in advance!

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02-02-2012 10:52 PM  6 years agoPost 2
JPhillips

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Waco, TX

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Have you tried changing your flight modes?

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02-03-2012 02:38 AM  6 years agoPost 3
Dr.Ben

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Richmond, VA, USA

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If the suggested 8 degrees of cyclic pitch range in the suggested swash AFR range is yielding too much control rate for your taste, it is acceptable to reduce the mechanical travel in the system so that you have 6 or maybe 7 degrees of cyclic pitch in the suggested AFR range. Unlike some flybarless systems on the market, the CGY 750 does not require a significant amount of throw "headroom" to function well. If you compress the AFR's down to less than 50% to yield (control) the maximum pitch and roll rate you desire, system performance will indeed suffer.

NB: In reducing the cyclic pitch as described, keep an eye on how high you have to drive the PITCH AFR to keep the collective where you want it. It's OK to have the PITCH AFR up a bit over 60%, but you don't want it much higher or you will drive the servos too far off neutral to allow for reasonable cyclic travel on top of whatever collective pitch is in the model. Also.......when you reduce the cyclic pitch travel in the model, you are also reducing the mechanical gain in the system. What this means is your cyclic gyro total gains will run a little higher than you may have seen on other set ups. This is not a problem per se, but when you do your initial tuning, make sure you turn up the cyclic gyro gains to the point the system tries to hunt/wobble so you have your baseline.

You MAY like the feel a bit better in the lower flight modes because the control delays are a little less aggressive, but if you try this route, I would still go into the EXPERT menus for the AIL and ELE gyros and keep the AVCS.DMP at min 98% on AIL and min 99% on ELE.

If any of this is unclear, please ask more questions.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-03-2012 08:40 AM  6 years agoPost 4
mdeeRocks

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UK

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All clear - thank you! I am going to try this out this weekend, weather permitting.
Flexibility of CGY750 is truly amazing
I have to admit that I've never tried flight mode 1, I am going to try this one first, with some adjustments (AVCS damp and expo, maybe control delays) before I change the setup mechanically.

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02-15-2012 12:50 AM  6 years agoPost 5
eppler

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Baytown, TX

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Can you use DR to adjust the amount of cyclic pitch?

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02-15-2012 01:05 PM  6 years agoPost 6
Dr.Ben

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Richmond, VA, USA

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You will use swash AFR to set the maximum pitch and roll rates, and then use D/R to fine tune (match) the throws if needed and to reduce throw if desired in certain flight conditions such as hover.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-17-2012 03:52 PM  6 years agoPost 7
gwright

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Champaign Il

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You may also want to play with the "control feel" setting. Simply leaving everything as-is and increasing control feel may give you what you want. I like it maxed out to 10, and most folks like it in the 3 to 7 range. I like a very smooth setup, although there is lots of overal control rate when needed. I think I'm the only person that uses 10 on this setting, but you might find 7,8,9 etc. to your liking. I don't like any control delays,.. at least not in the 750 itself, as I think that gives too much of a "detached" sense . I do have a tiny bit of control out delay however in the elevator,.. but I use the transmitter rather than the cgy, as I like to have as many things as possible adjustable without having to stop the blades. This is simply to stop a bit of bounce when decelerating on that axis. stop delay, derivative gain, and control out delay need to be balanced for this if you want it absolutely perfect, but I digress. I think if you increase control feel on both cyclics you may just find what you want. You may not, but worth trying.

Gary Wright

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02-17-2012 04:24 PM  6 years agoPost 8
eppler

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Baytown, TX

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I'll give it shot thank you i am going try all the diffrent ways and see witch one I like the best.

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02-17-2012 05:58 PM  6 years agoPost 9
Wyorcflyer

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Cheyenne, Wyoming USA

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If you do try different flight modes it will reset the Expo in the CGY750. I don't like layering Expo in the radio over the top of expo in the CGY750. I therefore zero the Expo in Pitch and roll in the CGY750 and just set it in the Transmitter. You can do it the other way around as well if you prefer.

Just be aware that there is expo in the CGY750 and it resets if you change flight modes.

Jack

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