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HelicopterFlybarless Rotor Head SystemsFutaba CGY › Futaba CGY750 Videos by Ron Lund!
08-05-2011 04:13 PM  6 years agoPost 1
bkervaski

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Birmingham, AL, USA

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Watch at YouTube

Watch at YouTube

Watch at YouTube

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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08-05-2011 09:15 PM  6 years agoPost 2
Charlie R

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Lafayette Ca

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Great job Ron !
Please keep them coming !
Charlie Rice

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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08-06-2011 10:05 PM  6 years agoPost 3
hookmaker

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Copenhagen, Denmark

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+1! - Waiting up for the next one!

/Henrik

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08-06-2011 10:10 PM  6 years agoPost 4
Mputu

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Killeen, TX

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Great stuff

Fly hard, Land safe

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08-06-2011 10:11 PM  6 years agoPost 5
Mputu

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Killeen, TX

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is there an adapter for 750 to enable the use of other radio system such as JR?

Fly hard, Land safe

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08-07-2011 02:25 AM  6 years agoPost 6
kcordell

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O Fallon, MO

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Will be shortly.

https://rc.runryder.com/helicopter/t646052p1/

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

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08-07-2011 02:48 AM  6 years agoPost 7
Mputu

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Killeen, TX

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Thanks Kcordell, it will be nice if it can be all incorporated in a single unit.

Fly hard, Land safe

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08-21-2011 09:25 AM  6 years agoPost 8
wbplomp

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Den Haag, The Netherlands

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Ron (and Dr.Ben),

I want to point at something. I have a T-Rex 500 and 550. On my 500 I have tried the tip to increase the Control Feel (Cnt.feel) from 5n to 10n. You must be aware of something...

At first I thought my heli flew nicer. Personaly, more flybar like. But then I noticed the heli seems to bail out a little bit on me. Cyclic behaviors. And at a certein point, I came out of a backwards loop the heli went totally out of control! I had a very hard time to get it back into control. It did not result into a crash, but it was very close and kind of dangerous as well.

After I set it back, no problems at all anymore. I share you this information, because I wonder if this setting works for smaller models like a T-Rex 500.

Any suggestions?

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08-21-2011 02:21 PM  6 years agoPost 9
Dr.Ben

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Richmond, VA, USA

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Try it at 7. I actually went back and revised my team tip to reflect this two weeks ago. That said, I've not experienced the adverse behavior that you observed. The only reason I changed to 7 is because the model felt a little "heavy" on the stick with the control feel @ 10. I've done multiple backwards loops with no issues on exit. I know that Gary Wright is still flying his at 10, and while he's not a smack pilot, and does just about everything backwards and forwards, upright and inverted. He's no seen that odd behavior either. The one wildcard is that you have a 500 class model, and I'm flying 600 and 700 class models as is Gary. The smaller models do react differently to parameter changes.

Drop back to 7 and see if it acts up again. If it does, we need to look closely at why it's doing it on your model.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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08-22-2011 12:50 PM  6 years agoPost 10
gwright

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Champaign Il

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I've never noticed what you stated above , but I'd like to just mention that my setup is for smooth "old school" 3D,.. that most people wouldn't even classify as 3D in this day and age. It's quite different from the norm as I run far lower headspeeds than are thought to be "standard", to smooth things out, lower the noise level, and increase flight times (I average 10 to 12 minutes). With lower rpms you can see some strange flight behaviours (flybarred/flybarless,.. doesn't matter) and the increased control feel is sort of like adding weight to the paddles, thus smoothing things out,.. ESPECIALLY when flying with some forward/sideways/backwards speed. At lower control feels and 1600~1700 rpm range you can get into situations where the heli will "bite" rather abruptly when you give elevator commands in fast flight, be it forwards, backwards, or sideways. The higher control feel smooths it out and reduces and/or eliminates the harsh bite, the same as heavier paddles would do. due to my lower rpm setup, many things are different in the 750 so I'm not sure it's good to even take my setup into consideration if you run higher rpms. For example,.. stop delays on cyclics are over 300, rate constants are maxed out at 150, and Diff gain down to 30. This was all to "dumb down" the 750 so the machine wouldn't rebound and do small oscilations when stopping from pitch/roll commands or "bite hard" when it has some speed. With higher rpms, there is enough response in the control loop so that none of this is needed, and the control feel can be lower too.

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08-22-2011 06:09 PM  6 years agoPost 11
wbplomp

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Den Haag, The Netherlands

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Thank you for your input.

Today I had a lot of time for flying. But right before I was able to test Cnt.feel at 7 it started to rain And currently it is still raining out here. So, I need to try it out later.

Before changing the Cnt.feel settings I started to tweak my cyclic gains a bit more accuratie. Before I had 75%/75% for AIL/ELE. Equal gains. I know that the ELE gain should mostly be a bit higer. Since I recently increased my I.Gain from 30 to 50 I am now able to get 85%/95% cyclic gains for AIL/ELE. I am actually very surprised to be able to have such high gains. The heli felt more locked in. But... what I noticed is that during elevator movements, like stationary flips it became a bit jumpy. As if jumpy collective inputs where given. Really weird. I have lowerd the gains to 80%/85%, now it is less jumpy, but still present.

Does this sound familiar?

Sorry, maybe this is a bit off-topic. If so, just let me know. I just started this because it looks like wat Cnt.feel does for you.

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08-22-2011 06:25 PM  6 years agoPost 12
gwright

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Champaign Il

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I'm not sure what you mean by "jumpy",.. unless it's the stops rebounding.

Those gains are not really all that high. My cyclic gains are well above 100,.. something like 135/120 if I remember correctly. The higher the better.

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08-22-2011 06:33 PM  6 years agoPost 13
wbplomp

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Den Haag, The Netherlands

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Ok, that high!? Hmmm.. I will try to go higher then. Don't know if it possible on my model, but maybe it does. I will try next time and let you know.

With jumpy I mean I cannot get the stationary flips spot on, as if little collective inputs are given by itself during elevator input. Noticable during flips. Hard to explain. If I lower the gain(s) it is more accurate.

It looks like what the Speed.Cmp settings in the Swash Expert menu can solve. I was never able to set that one right either.

At this point there are three settings I am going to work on.

- AGn and EGn
- Cnt.feel
- Speed.Cmp

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08-22-2011 07:12 PM  6 years agoPost 14
knightofcarnage

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chicago

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FYI 120 is the max gain you can set on the unit. Having it that high will mostly like toast your servos or at least suck your batts dry. An idea main gain for A/E is bettween 65 to 85 in my option.

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08-22-2011 07:54 PM  6 years agoPost 15
gwright

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Champaign Il

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Strange,.. I've had gains that high for a long time now. Measure servo temps regularly and I rarely even see three digits (temp in farenheight, servos 9255's with 6V supply). If you go into the unit, you can increase gains to 150,just remember that afterwards, each digit you increase gain in the radio is then more than one percent.
I fly pretty long flights and use 220 to 280 mah per flight now. I use a 3-cell 1350 regulated to 6V.

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08-22-2011 07:57 PM  6 years agoPost 16
wbplomp

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Den Haag, The Netherlands

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I don't have a 8FG, it doesn't fit my hands very well, to small.

I have set my ELE/AIL gains in the CGY750. Maybe that makes sence.

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08-22-2011 08:09 PM  6 years agoPost 17
gwright

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Champaign Il

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Setting the gains in the unit is fine,.. you just won't be able to change them with different flight conditions from the transmitter. The 14MZ gives me 3 rates per flight condition, so I can drop the gains for auto's, and for lower rpm hovering stuff. By setting it in the unit, you simply need to set the gains for the lowest common denominator. If you only fly a one rpm setup like most folks these days, it's irrelevant anyway.

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08-22-2011 10:06 PM  6 years agoPost 18
knightofcarnage

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chicago

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Does anyone else think that Ron looks like a huge bad ass. Some you would not want to get in a fight with. Kind reminds me of charles bronson lol.

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08-22-2011 11:11 PM  6 years agoPost 19
Kevin Dalrymple

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Indianapolis

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Those gains are not really all that high. My cyclic gains are well above 100,.. something like 135/120 if I remember correctly.
Gains are affected by the mechanical set up of the heli. If you are using large servo throws to to move the heli then you will have a high gain.

It is like a tail gyro set up. If you run a small horn then you can crank the gain up. But if you use a large horn and use high gain the tail will wag. I believe there is a balance between mechanical set up and electronic set up. Also tunning that depends on your flying style and how fast you want the heli to move off center.

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08-23-2011 12:34 AM  6 years agoPost 20
gwright

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Champaign Il

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very well stated! It is like tail setup, but with a difference in that the higher the rpm the higher you can run the gain, so that one bit is opposite the tail setup. my rpms in three flight modes are "roughly" (due to slight variances in battery packs), 1600,1700,2000, and the gains can be pretty dramatically higher in the highest rpm mode than they can in the lower rpm modes.

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HelicopterFlybarless Rotor Head SystemsFutaba CGY › Futaba CGY750 Videos by Ron Lund!
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