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HomeAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › Futaba going to fix issues with CGY750?
08-02-2011 02:29 AM  6 years agoPost 61
joe1l

rrNovice

long valley, NJ

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I have 3x CGY750's 1x vbar5.1pro 1x BeastX. I've had mine for quite a while now and am very happy with them. The biggest problems i've seen with them has been mostly related to setup. Since the 1.10 firmware, the biggest issue that i have seen is that the heli doesn't stay perfectly level in pitch pumps when using the std trim flight directions. I've since come up with my own method that actually seems to work though. There have been other reported issues that i have read about but haven't had myself. That being said..every other FBL system out there on the market has issues. One other issue i keep seeing is that people try the CGY750 for a day or two and then write up a whole thread on how disappointed they are with it. I've yet to try a FBL system that worked perfect the first time...the BeastX probably has the highest success rate in that department because of its stellar setup guide and more important lack of user customization. Where as the CGY, vbar and SK720 will allow a wide variety of customization allowing the heli to feel and fly differently.

Its funny but the way i look at it is that if Futaba continues improving the firmware like they have, addressing issues and adding enhancements..the CGY750 will be really hard to compete with.

Fusion 50 CGY750 YGE90HV
Outrage 550 BeastX Jive100
Gaui X5 Vbar 5.1
Gaui X5 CGY750

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08-02-2011 05:34 AM  6 years agoPost 62
knightofcarnage

rrElite Veteran

chicago

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Everyone keeps forgetting they only had 1 update. All other had much more than that. I think they very close to bulls-eye with it.

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08-02-2011 11:56 AM  6 years agoPost 63
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Everyone keeps forgetting they only had 1 update. All other had much more than that. I think they very close to bulls-eye with it.
So far Also it is a lot easier to design and execute something after seeing the shortcomings of other units for years rather than desiging something from scratch with no prior vision. Goos unit as far as I can tell but still needs some refinement to widen flexibility............Ron

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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08-02-2011 08:25 PM  6 years agoPost 64
MikeG4936

rrNovice

Irving, TX

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I've had nothing but good luck with the 750. Besides a few issues which are clearly setup/tuning related, this thing flies perfectly. If you pay attention, it really isn't difficult to set up and its ability to be tuned to the user's liking is just fantastic. As a previous poster has said, they are very close to bulls-eye with only one update released thus far.

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08-02-2011 08:51 PM  6 years agoPost 65
Mike Fortin

rrElite Veteran

USA

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If anyone needs help with setup on their 750 I along with many other Futaba Team members will be onsite at IRCHA to help out.

There might even be some seminars as well.

Have Rotors, Will Fly!

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08-02-2011 09:49 PM  6 years agoPost 66
hgh001

rrApprentice

New Zealand

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Myself and a friend have recently fitted the CGY 750 and Hirobo SSL(FBL head). Worried initially since my Freya had a D3 head (SSZ-4) fitted to it, and ran extremely well.

As mentioned above a worried since my Freya with the SSZ-4 head ran extremely well but...it ran even better with the 750.

I have done a total of 8 flight since the conversion. BTW the last to flights were done at our annual Airshow and my heli and electronics took the 3D beating well. Flights included piro flips, etc.

The only changes I have made so far are to the expos on my 750 and 8FG and switched to flight mode 5 on the 750.

Issues with 750...NO, NO, NO!!!

Pilots with other FBL units still can't believe what they have seen. Takes a little getting used to, expected from FBL.

Congratulations to the Futaba team for producing another excellent product that out performed all other existing products. Futaba has done and excellent job with the 750. Both of us found the manual user friendly.

Issues experienced will be related to setup, definitely not to the 750!

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08-09-2011 01:08 AM  6 years agoPost 67
PBusch

rrKey Veteran

Minnesota

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Has anyone actually figured out the issue with hot servo's? I'm running 8917's off a 2S lipo regulated at 6 volts in my 700N and CGY750 and they get so hot I can't even touch them, I mean their REALLY hot!!!!!!!!!!

I played with the gains and they still run very hot, tried changing the voltage on my Gryphon regulator with no luck. Theirs no weird binding or anything like that, at this point I'm at a total loss as far as what to do. I don't even want to fly it anymore until I get it resolved, there's no sense in crashing because a cyclic servo burned up.

Any suggestions are welcome, I don't mind buying new servos but not until I'm positive that will fix the issue.

BTW, I'm pulling about 400 out of my receiver pack.

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08-09-2011 01:32 AM  6 years agoPost 68
heavyload699

rrApprentice

Independence Mo. USA

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I had the 8717 doing the same thing with the 750, I went and got the futaba Hv 255 problem fixed, CGY 750 doesn't like the JR servo's.

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08-09-2011 02:15 AM  6 years agoPost 69
Eury

rrProfessor

Dover NH

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Here's what I've noticed: If I get the gains up over 60-65% the servos start getting hot, and there is no difference in flight performance. They really shoot up once it hits 75%. I've confirmed that with 8717s and DS610s, they both do the same thing. I tried dropping the sensor to moderate, it makes no difference.

Run the gains around 60%, it'll be locked in and your servos will be cool. I'm not going to go buy Futaba's ridiculously priced HV brushless servos to run a 750. It performs great with the good stuff I can buy used for around $150 for 3, money is better spent on batteries.

Nick Crego

Citizen #0168

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08-09-2011 12:27 PM  6 years agoPost 70
PBusch

rrKey Veteran

Minnesota

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I agree Eury but my gains are at 60 and they still get really hot.

I hate to have to spend another 500 bucks just for some new servo's. WTF!!!!!

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08-09-2011 12:40 PM  6 years agoPost 71
Eury

rrProfessor

Dover NH

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That's really strange, mine drop the temp as soon as they get to 60. I gotta be honest, I'd dump the 750 and get something else if it was cooking servos no matter what. Just not worth it.

Nick Crego

Citizen #0168

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08-09-2011 03:02 PM  6 years agoPost 72
BisonFlyer

rrKey Veteran

Winter Garden, FL

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PBusch... have u lowered your gains below 60? Try 50 or even 40 and measure the temps there.

Art Hughes
SAB Heli Division~Byron Fuels~Mikado V-Team~Scorpion~Pulse~Xpert Servo~Kontronik Drives

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08-09-2011 04:59 PM  6 years agoPost 73
knightofcarnage

rrElite Veteran

chicago

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Here's what I've noticed: If I get the gains up over 60-65% the servos start getting hot, and there is no difference in flight performance. They really shoot up once it hits 75%. I've confirmed that with 8717s and DS610s, they both do the same thing. I tried dropping the sensor to moderate, it makes no difference.

Run the gains around 60%, it'll be locked in and your servos will be cool. I'm not going to go buy Futaba's ridiculously priced HV brushless servos to run a 750. It performs great with the good stuff I can buy used for around $150 for 3, money is better spent on batteries.
I guess i just don't get ppl who complane about servos getting hot when they are using higher voltage then the servos where designed for. 8717 are rated at 6V unless you get the silver ones 8717HV (which by the way are $189 per servo) or you get 8917 (which are $150). Now I burned out a 8917 with a skookum 720 running at 7.4 regulated. (BTW if your running unregulated you will get any servo hot). When i got it serviced under warranty. The tech ask what voltage i was running the 8917HV at. Which was 7.4V thru a Scott Grey VR. The first think that came out the his mouth was i was going to burn out more servos and they will get hot, and they will not warranty my servo. After few mins of arguing back and forth and say its false advertisement on the 8917 being rate at 7.4V. I got them to replace the servo. What i got out of the call with the tech was that: JR servos are over rated on there specs.

Now the gain issues. ANY gyro tail, 2 axis and 3 axis will work your servos harder when your increase gain. Just because i have 60 gain on Vbar does not mean is the same as cgy750, skookum or 3G. They all handle there variables different.

I sold my 2 sets of 8917HV and replaced them with BLS255HV and i can tell you. Its a night and day difference. They are super smooth, very very precises and they do run cooler then 8917HV.
No thing if you know futaba they usally under spec there stuff. They don't release a servo/gyro/radio/engine until they done all there homework. Just look at the raidos. hands down the more robust then JR/Spec. They where not first to market with it, just like servos. I believe JR had HV servos 3y ago (I believe that 8917HV are market gimmick and they just are 8717, but the 8717HV are actual rated correctly)

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08-09-2011 05:07 PM  6 years agoPost 74
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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I guess i just don't get ppl who complane about servos getting hot when they are using higher voltage then the servos where designed for.
Because not all systems do that. As a matter of fact the 750 is the only one that does. MANY run 8717s @ 8v FB or FBL without issue. My latest setup is running 8717s @ 8v (unregulated) and the servos are not even warm after a flight. Besides some are reporting the same issue with 8717s and 8917s @ 6v...............Ron

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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08-09-2011 05:13 PM  6 years agoPost 75
Eury

rrProfessor

Dover NH

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I guess I just don't get people who complain about people complaining about their stuff getting hot because they assume that everybody is running their servos over voltage. My stuff is all regulated to 5.6v and the ds610s and 8717s will both get hot if I run the gains over 60%. Personally I don't care, it works fine with the gain down there. You can go off and drop the cash on the Futaba HV servos, but I'm not going to waste the money when the existing stuff works fine and is a fraction of the cost.

Nick Crego

Citizen #0168

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08-09-2011 05:27 PM  6 years agoPost 76
Fnity

rrKey Veteran

Socal - Lafayette, IN

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On one CGY machine I have 8917HVs that were hitting 140-150deg running them at 2S specs. Have since reduce my gains to 60 and went with LiFe packs reducing the temps to 120-130. Still dont like fact I must run a 2S servos this way and even after that must reduce gains to this point.

Like Eury says they work great with the gains low, but not being able to run a 2S servo at 2S is wrong when these servos rock on a FB or other manufacturers FBL system. IMO, This is a Futaba issue. When running servos withing spec and they overheat its not the servos fault whether they are a $200 or $50 servo

*Edit*

Will add the CGY is amazing and my ONLY complaint is this heat issue.

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08-09-2011 05:34 PM  6 years agoPost 77
BisonFlyer

rrKey Veteran

Winter Garden, FL

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have u lowered the gains below 60? Not sure why there is an assumed baseline of 60%, but I ran my BLS451's at 45 and had no temp issues and it flew great. I now run my gains higher with the BLS255HV's but would def lower my gains below 60 and see if your temps drop.

Art Hughes
SAB Heli Division~Byron Fuels~Mikado V-Team~Scorpion~Pulse~Xpert Servo~Kontronik Drives

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08-09-2011 06:21 PM  6 years agoPost 78
Fnity

rrKey Veteran

Socal - Lafayette, IN

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Yes, tried below 60 and same thing 120-130 so I went back up to 60 as 65 raised temps to the 130-140+ range...
Not sure why there is an assumed baseline of 60%
**According to Futaba Reps on here we are to raise the gain until oscillation and then back them down a bit as with other gyros, this is not the case as there is no way I can run those high gains without torching the servos. Also manual states Ail/Ele 80-100% on a 90

Sure there are many variables but assuming proper setup the gain at 50 to keep temps down is not right(IMO) This machine is amazing with the gains at 75/85 but having to drop the gain to 50 to keep the servos cools is a CGY issue to me.

Many will say its a setup thing and we dont know what were doing but that is not the case at least not with everyone. My other CGY machine(Fusion50) is just fine w/6V servos running @6V gains at 80-70 simply AMAZING!

This thing just doesn't like my 8917HVs and many other servos, but I will make due as Im not jumping on the BLS255 boat after purchasing what I have.

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08-09-2011 06:42 PM  6 years agoPost 79
knightofcarnage

rrElite Veteran

chicago

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According to Futaba Reps on here we are to raise the gain until oscillation and then back them down a bit as with other gyros, this is not the case as there is no way I can run those high gains without torching the servos. Also manual states Ail/Ele 80-100% on a 90

Sure there are many variables but assuming proper setup the gain at 50 to keep temps down is BS(IMO) This machine is amazing with the gains at 75/85 but having to drop the gain to 50 to keep the servos cools is a CGY issue to me.

Many will say its a setup thing and we dont know what were doing but that is not the case at least not with everyone. My other CGY machine(Fusion50) is just fine w/6V servos running @6V gains at 80-70 simply AMAZING!
your dead on right, I don't think you can raise a vbar to 80 gain on cyclic. Like i said 60 gain on 750 does != vbar,skookum,mb etc gain. They treat the values different. BTW iw was not tell anyone to buy BLS255HV. I was not happy with the JR8917HV, so as soon as a good Futaba servo came out, I grab it, and took a HUGE hit on selling 6 jr servso. Spent $875 and sold for $500.

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08-09-2011 06:56 PM  6 years agoPost 80
PBusch

rrKey Veteran

Minnesota

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After reading through all the post the one consistency is the CGY750 does not like the 8917's. Why that is I have no idea but it appears it doesn't have anything to do with running them on a higher voltage.

Unless I missed something has ANYONE gotten their 8917's temp down at least to a reasonable level? Mine are so hot I can't hold my finger on them for more then ONE second. I never temp gunned them but obviously something is wrong.

I REALLY don't feel like dropping another 500 bucks at this point.

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