CGY750 Expert Settings effects

[AcidDrink]

A question - I am new to fbl systems (cgy750 is my first besides mcpx), can someone briefly describe how "98% to 100% which increased the stability of my heli without compromising on my control feel/accuracy" would feel?
My AFRs are quite high (50-70 on 450 class heli12/8 pitch collective/cyclic), so I am going to play with AVCS damping, but I just don't know when the value would be too high.

Right now I have it setup at 99% both aileron/elev, flight mode 3 and -15% expo (rest stock) and heli feels quite a lot too soft/tame (or like too much expo). I am used to 250 size FB heli setup with almost no expo and about 8 degrees on cyclic - controls are immediate and very linear, which I like.

[benwhite22]

Thanks for the very useful info, joe1l!

Originally Posted by AcidDrink

A question - I am new to fbl systems (cgy750 is my first besides mcpx), can someone briefly describe how "98% to 100% which increased the stability of my heli without compromising on my control feel/accuracy" would feel?
My AFRs are quite high (50-70 on 450 class heli12/8 pitch collective/cyclic), so I am going to play with AVCS damping, but I just don't know when the value would be too high.

Right now I have it setup at 99% both aileron/elev, flight mode 3 and -15% expo (rest stock) and heli feels quite a lot too soft/tame (or like too much expo). I am used to 250 size FB heli setup with almost no expo and about 8 degrees on cyclic - controls are immediate and very linear, which I like.

AcidDrink, try changing your Flight Mode to 4 or even 5. This will liven the control feel up considerably.

[joe1l]

thanks guys! i'm glad the info is helping. Well i hope it is helping. A product can be the better than all of its competitors but if people don't understand how to use it then it might as well be the worst. im hoping now that people understand the Expert settings that more will tune and provide even more feedback. bbremer is the person everyone should be thanking considering he cleared up some of the most confusing settings. I'm still a new pilot but i know what i like and if a system doesnt inspire confidence then i'll have a hard time flying it. The CGY750 inspires confidence and thats what i like...but it needs some tuning to get it right for me.

[AcidDrink]

Just came back from the field, did some tweaking based on info from this thread and it's fantastic.
Stayed with flt mode 3 for time being, but upped AVCS damp to 100, igain to 50% (both elev/aileron) and flew in 20 mph winds, heli didn't even feel it... (it's mini protos, 450 size).
After lowering in/out values a notch it feels just right now!
I have to adjust tail gain a bit, but that's it I think.

Thanks again!

[Knud Pedersen DENMARK]

Rudder delay mode (Dly.Mode) from Function to Constant. (manual Page 92)
Defualt: Function.

Anybody tried the Constant mode?
Ill try on my next flight

PS: what a great Sticky

[joe1l]

Originally Posted by AcidDrink

A question - I am new to fbl systems (cgy750 is my first besides mcpx), can someone briefly describe how "98% to 100% which increased the stability of my heli without compromising on my control feel/accuracy" would feel?
My AFRs are quite high (50-70 on 450 class heli12/8 pitch collective/cyclic), so I am going to play with AVCS damping, but I just don't know when the value would be too high.

Right now I have it setup at 99% both aileron/elev, flight mode 3 and -15% expo (rest stock) and heli feels quite a lot too soft/tame (or like too much expo). I am used to 250 size FB heli setup with almost no expo and about 8 degrees on cyclic - controls are immediate and very linear, which I like.

With a 450 start at the default value of AVCS.dmp and increase 1 point on both ail and elev and test fly. You will see that heli would feel more solid but you may feel a slight decrease in accuracy or sensitivity. Now from what you are describing, AVCS.dmp will not help with, instead increasing flight mode will help. If you find that increasing your flight mode from 3 to 4 doesnt help then chances are your AFR's are too high then you may need to go out 1 position on your servo arms to get a little more throw. IF you are getting 8 degrees of Ailerion at 60% or more AFR then i would go and increase your throw and see if you can land at 50-60 range instead. Elevator on the other hand 60% AFR is norm. You should try increasing your cyclic gains in the TX as this will help with that feeling. A trex250 is a fast heli so the 450 will always feel slower compared to it, therefore increasing your cyclic to 8.5 or 9 degrees might be better.

[AcidDrink]

Originally Posted by joe1l

With a 450 start at the default value of AVCS.dmp and increase 1 point on both ail and elev and test fly. You will see that heli would feel more solid but you may feel a slight decrease in accuracy or sensitivity. Now from what you are describing, AVCS.dmp will not help with, instead increasing flight mode will help. If you find that increasing your flight mode from 3 to 4 doesnt help then chances are your AFR's are too high then you may need to go out 1 position on your servo arms to get a little more throw. IF you are getting 8 degrees of Ailerion at 60% or more AFR then i would go and increase your throw and see if you can land at 50-60 range instead. Elevator on the other hand 60% AFR is norm. You should try increasing your cyclic gains in the TX as this will help with that feeling. A trex250 is a fast heli so the 450 will always feel slower compared to it, therefore increasing your cyclic to 8.5 or 9 degrees might be better.

Thanks for that, very good explanation.
I have decreased my in/out values for aile/elev by 1 and it's all good now. My AVCS damp is set to 100% and I don't think I feel any decrease in accuracy or sensitivity - I asked an experienced pilot who flies a 700 FBL to test fly it and he said it was very sensitive . I'll try to lower it to 99% just to see how it feel and see what happens. All I know is that heli is very stable even in 20 mph gusty winds.

Thanks again!

[Knud Pedersen DENMARK]

My AVCS damp is set to 100% and I don't think I feel any decrease in accuracy or sensitivity - I asked an experienced pilot who flies a 700 FBL to test fly it and he said it was very sensitive . I'll try to lower it to 99%

i guess the sensitive-ness could also be becuase of low Expo.
100 AVCS.damp is default in FM5

[AcidDrink]

Originally Posted by Knud Pedersen DENMARK

i guess the sensitive-ness could also be becuase of low Expo.
100 AVCS.damp is default in FM5

I like how it reacts now, very immediate (just a matter of preference - I am not big fan of expo).
Going to play round with AVCS damp just to feel how it changes heli's behaviour.

[Knud Pedersen DENMARK]

I like how it reacts now, very immediate (just a matter of preference - I am not big fan of expo).

me to

You could also try to play with the Igain

[Steve Evans]

Most of my flying with the CGY750 has been in flight mode 3 as that seemed a good place to start. I've read this thread with interest, noting what's been said, but given the poor documentation, I've reckoned that once you get your AFRs setup for good resolution it was probably best to start by trying the other flight modes.

I've therefore given flight mode four a try. My immediate impression was that my 500ESP became very lively; more precise but rather more twitchy. To be honest, although impressed by the evident control being offered I liked the feel of flight mode 3.

Then I checked the table in the manual and saw that the AIL/ELE expo is -40% in FM3, but -30% in FM4. So this lunchtime at the park I set both to -40% in FM4. Wow, what a difference. Now I have all the control, but extra crisp and precise. It gave me the confidence to try inverted for the first time on the 500 and it was just like the sim!

Steve

[wbplomp]

Originally Posted by Steve Evans

Most of my flying with the CGY750 has been in flight mode 3 as that seemed a good place to start. I've read this thread with interest, noting what's been said, but given the poor documentation, I've reckoned that once you get your AFRs setup for good resolution it was probably best to start by trying the other flight modes.

I've therefore given flight mode four a try. My immediate impression was that my 500ESP became very lively; more precise but rather more twitchy. To be honest, although impressed by the evident control being offered I liked the feel of flight mode 3.

Then I checked the table in the manual and saw that the AIL/ELE expo is -40% in FM3, but -30% in FM4. So this lunchtime at the park I set both to -40% in FM4. Wow, what a difference. Now I have all the control, but extra crisp and precise. It gave me the confidence to try inverted for the first time on the 500 and it was just like the sim!

Steve

This sounds interesting. I also fly my 500 in FM 3. But I have lowered my EXPO and lowered the ANG.Rate as well. That gave me a very comfortable feeling. Apart from the one or two problems I still encounter. FM 4 is to twichy for me. EXPO does not change that for me. Did you change the ANG.Rate as well?

[joe1l]

Originally Posted by Steve Evans

Most of my flying with the CGY750 has been in flight mode 3 as that seemed a good place to start. I've read this thread with interest, noting what's been said, but given the poor documentation, I've reckoned that once you get your AFRs setup for good resolution it was probably best to start by trying the other flight modes.

I've therefore given flight mode four a try. My immediate impression was that my 500ESP became very lively; more precise but rather more twitchy. To be honest, although impressed by the evident control being offered I liked the feel of flight mode 3.

Then I checked the table in the manual and saw that the AIL/ELE expo is -40% in FM3, but -30% in FM4. So this lunchtime at the park I set both to -40% in FM4. Wow, what a difference. Now I have all the control, but extra crisp and precise. It gave me the confidence to try inverted for the first time on the 500 and it was just like the sim!

Steve

That is exactly what i encourage many people to do. The other big setting you can look at is Control delay in and Out. It is similar to expo and can help smooth out any twitchy behavior sometimes. There is a difference between the values for FM3 and 4 and you might want to right in the middle.

[wbplomp]

With my T-Rex 500 I fly in FM2 and lowered the ANG.Rate to 90%. I want more stability and precision, but I don't want have a twitchy heli.

Is it worth to switch over to FM3 or FM4 and lower the ANG.Rate and maybe some other settings?

[AcidDrink]

Originally Posted by wbplomp

With my T-Rex 500 I fly in FM2 and lowered the ANG.Rate to 90%. I want more stability and precision, but I don't want have a twitchy heli.

Is it worth to switch over to FM3 or FM4 and lower the ANG.Rate and maybe some other settings?

http://www.facebook.com/notes/futaba...50225340356618

[wbplomp]

I think I am going to try FM4 then. The only thing is, I don't like to tweak that much as described in the link. I also wonder the different effect between ANG.Rate (CGY750) and AFR/DR (Tx).

[Steve Evans]

See HERE for some relevent discussion of ANG.Base, ANG.Rate and AFRs.

Steve

[joe1l]

Originally Posted by wbplomp

With my T-Rex 500 I fly in FM2 and lowered the ANG.Rate to 90%. I want more stability and precision, but I don't want have a twitchy heli.

Is it worth to switch over to FM3 or FM4 and lower the ANG.Rate and maybe some other settings?

Many people have stated that the higher flight modes offer a more stable heli...the reason i see for this is because the higher the flight mode the higher the default value for AVCS.dmp. I suggest choosing a flight mode that feels closest to how you want your heli to feel. If you want quick cyclic then probably one of the higher flight modes but if you want something slower then go with lower ones. If you feel FM3 or 4 is twitchy then go start with 2 and make changes. Whatever flight mode you are in, i always suggest having optimal resolution so that you can increase your AVCS.dmp to 100% which increases the overall stability feeling of your heli without loss of feel.

[BladesOfFire]

hi, just got my 750 3 days ago and i've been doing alot of reading trying to set this thing up. I got my swash going the right directions when i move the stick and I noticed that my PIT servo (channel 6) has less up throw than down throw. I would assume that i have to go to endpoint setting on the 750 and adjust from there, but i can't find it anywhere (basic or expert). Its a simple thing to do but can't find it for the life of me. I'm getting 7 degress right cyclic and 11 degrees left cyclic?

I even tried changing endpoint on my radio(T8FG) but all i got was more or less pitch. coming from the 7C radio, i would think it would adjust the servos individually but guess not, so i ditch that idea.

[joe1l]

Originally Posted by BladesOfFire

hi, just got my 750 3 days ago and i've been doing alot of reading trying to set this thing up. I got my swash going the right directions when i move the stick and I noticed that my PIT servo (channel 6) has less up throw than down throw. I would assume that i have to go to endpoint setting on the 750 and adjust from there, but i can't find it anywhere (basic or expert). Its a simple thing to do but can't find it for the life of me. I'm getting 7 degress right cyclic and 11 degrees left cyclic?

I even tried changing endpoint on my radio(T8FG) but all i got was more or less pitch. coming from the 7C radio, i would think it would adjust the servos individually but guess not, so i ditch that idea.

there isnt a menu on the CGY750 to adjust this . f you are getting more Right cyclic then left, you should be instead trying to adjust it via Ailerion endpoint (Ch1) for left and right. You should not adjust the pitch endpoint.

My only guess as to why it is so off is that you either acidently have subtrim programmed in your radio or it may be due to your neutral point set in the swash menu. Maybe you have it adjusted so high that it is hindering the movement. I would go take a look at your neutral values and see if you have any that are more than 90. If i find that i need more than 90 points of adjustment on any servo, i instead move the servo horn.