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HomeAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › CGY750 high current draw per flight
01-03-2014 03:02 PM  4 years agoPost 1
Bugcatcher

rrApprentice

Perth, Australia

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Hi,

Just wondering what current draw usage everyone is getting out of there CGY750.

I've noticed a bit of difference between my models using all the same servo's and also using straight 2S lipo for supply. Only difference is one has a CGY750 the other a Silverline Vbar.

On my Logo 700 using BLS172HV/BLS256HV I'm only using about 150mah per flight while my D3 using the same servo's on the CGY750 uses about 550mah per flight.

I've noticed that since the 1.31 update that the CGY750 uses more mah since the update.

Before anyone mentions, apart from the usual setup settings everything else is stock, aile/elev head responses are default and I do have a little FF Mix in as well.

Any ideas are welcome.

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01-03-2014 04:30 PM  4 years agoPost 2
knightofcarnage

rrElite Veteran

chicago

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150 mah seem way too low. I'm getting about 400 to 600mah on
My nitro. Also whart head response are you using .

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01-03-2014 06:40 PM  4 years agoPost 3
rexxigpilot

rrProfessor

Florida

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It's very hard to provide a good comparison unless the two FBL gyro controllers were on the same machine with the same setup and flying the same routine. The best comparison I can make for you is between two of my 600 class helis. One with the CGY750 is a nitro model ElyQ Vision 50C. The silverline V-Bar is on a Logo 600. Each uses BSL451 cyclic and BLS251 tail servos. Same 603mm Edge FBL blades and same 2100 head speed. My CGY750 on the ElyQ uses around 550mAH per 8.5 minute flight or 65mAH per minute of flight. The Logo uses 330±mAH per 6 minute flight for 55mAH/minute. So my CGY750 uses more current with similar setups. The Logo uses a BEC to provide regulated 6.0V to the RC system while the ElyQ uses as A123 pack with an average voltage of about 6.8V. This produces a per minute power consumption of approx. 330WH for the Logo and 436WH for the ElyQ. The CGY750 uses about 32% more power. I suspect this is due to a faster servo refresh rate for the CGY750 instead of inefficiency, so I'm not concerned about it. One caveat to this data is the ElyQ with half a tank of fuel weighs 0.54 lb. (5.5%) less than the Logo, so the CGY750 actually uses slightly more (33.8±%) additional power.

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01-03-2014 07:07 PM  4 years agoPost 4
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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I don't know about the CGY but my Logo 700 with Blueline VBAR uses ~250mah per flight with BLS 451s and a 251 for the tail 2s direct (regulator for the tail).
My 800XX got about the same with VBAR and BLS 157HVs and BLS 256 all 2s direct….

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

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01-03-2014 07:44 PM  4 years agoPost 5
bkervaski

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Birmingham, AL, USA

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What do you have your servo refresh rate set to?

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

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01-03-2014 08:39 PM  4 years agoPost 6
JKos

rrProfessor

Redondo Beach, CA

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It would be interesting for you to test at different servo refresh rates.

Also, note whether you can feel any difference at all in flight performance. You could even have someone else set the refresh rate so that you don't know what it is while you are flying. My hypothesis is that you will not be able to tell any difference feel.

- John

RR rules!

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01-03-2014 10:02 PM  4 years agoPost 7
BobOD

rrElite Veteran

New York- USA

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I agree it's most driven by the frame rate. If you have the CGY set to a high rate this could certainly explain the difference. Most of it anyway.
The Vbar has only 2 settings, Analog and digital. I don't know what the frame rate is but suspect they are 50 and 75hz judging by the feel of it. Both quite conservative so would explain the differences.
I agree with Jkos, you may not notice the difference other than the mah consumption of course.

Team POP Secret

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01-03-2014 10:19 PM  4 years agoPost 8
JKos

rrProfessor

Redondo Beach, CA

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Another test is to swap heads on the helis, if possible. Head geometry will influence servo demands greatly, even as simple as FBL heads seem.

- John

RR rules!

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01-04-2014 01:53 AM  4 years agoPost 9
Sam2b

rrElite Veteran

Tacoma, WA

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Consider using the VoltMagic device that reveals how low your voltage is dipping throughout your flight, even with a regulator/BEC. It does more than that, but at a sample rate of >1000 per second it's interesting to at least see the peak low voltage dip caused by your servos and other stuff connected.

_Sam B_

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01-04-2014 02:04 AM  4 years agoPost 10
Ace Dude

rrProfessor

USA

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The Fromeco Cricket is also an excellent device for measuring the lowest voltage recorded during a flight.

  

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01-04-2014 12:11 PM  4 years agoPost 11
Bugcatcher

rrApprentice

Perth, Australia

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Thanks for all the suggestions.

Apart from the FBL controller and actual mechanics, the heli's are the same, using identical servo's, blades, power supply etc.

150mah is consistent with my other heli's. On my competition F3C Eagles I am using just over 100mah per 8min flight on a flybar head.

To make it worse, the Logo700 is heavier airframe than the D3 and probably flown harder as well. The only plus to the D3/CGY750 is that they are 6-7min flights instead of 4min on the Logo700 but still I am seeing approx. 100% more power being used by the CGY750 over Vbar.

To answer a couple of questions.

Servo's are set 285hz as recommended for Futaba's in the CGY750.
Head response is as default (3 aile, 1 elev).

On my SDX 50, it is even worse using the CGY750 on 6V, consuming about 900mah per 8 min flight. I was getting about 500-600mah per flight in flybar configuration.

Might be a case of doing a reset and fresh setup on the CGY750 heli's even though I did do that when updating to the 1.31 software.

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01-04-2014 10:40 PM  4 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

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What servos at 6v in the SDX?

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-05-2014 01:29 AM  4 years agoPost 13
Bugcatcher

rrApprentice

Perth, Australia

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BLS253's and BLS251 all via a Powerbox Gemini in the SDX.

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01-05-2014 02:59 AM  4 years agoPost 14
BobOD

rrElite Veteran

New York- USA

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Servo's are set 285hz as recommended for Futaba's in the CGY750.
It sounds like Futaba is driving for the maximum servo performance. That may or may not be what you want or need. Can't have your cake and eat it too.

Team POP Secret

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01-05-2014 03:20 AM  4 years agoPost 15
JKos

rrProfessor

Redondo Beach, CA

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Easy enough to turn it down and take it for a whirl to see if it makes any difference.

- John

RR rules!

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01-05-2014 05:30 AM  4 years agoPost 16
Dr.Ben

rrMaster

Richmond, VA, USA

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Servo driving frequency was proven several firmware versions ago to have minimal effect of current use per flight. 285 Hz is the accepted standard for all Futaba digitals used for cyclics. Head response does have an effect. The higher the number, the lower the average current consumption but also the lower performance of the system.

I also want to clarify from your first post. Are the servos with the 750 being run on straight 2S lipo voltage or not?

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-05-2014 06:45 AM  4 years agoPost 17
Bugcatcher

rrApprentice

Perth, Australia

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Hi Ben,

Yes, my D3 (CGY750), Logo700 (Vbar) and my 2 Eagles (GY701) are all running on direct 2S lipo setup via a soft switch. SDX (CGY750) is on 5.8V/5.3V via a powerbox Gemini.

The D3 and Logo700 are using identical servo's BLS175HV/BLS256HV.

I actually a little worried about how much the CGY750 will use when I switch my F3C machine over to FBL. Right now it's great as I only use a little 1350mah Rx pack and get 6+ flights without getting worried about getting low on the battery.

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01-06-2014 12:27 AM  4 years agoPost 18
Dr.Ben

rrMaster

Richmond, VA, USA

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It is a little perplexing to me where the current consumption is coming from since all my stuff is pulling maybe 300mah/flight with BLS273HV's.

The one thing that I am thinking about is the fact that the cyclic servos are not helicopter variants, and they may be responding to the information feed from the 750 in a manner which which creates greater current consumption than that normally observed when the task designed Futaba helicopter servos are in there. We had issues with servo heating and excessive power consumption in the first couple of firmware version for the 750, but I can't remember the last time I had to make a comment on those two topics since 1.3X released.

Do something for me on the SDX. Drop the voltage from the powerbox on the SDX to 5.5V tell me to what your power use drops per flight.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-06-2014 03:37 AM  4 years agoPost 19
Bugcatcher

rrApprentice

Perth, Australia

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Yeah, it is a little puzzling TBH. Have others at the club using a lot less than I am.

For the SDX, I can't alter the voltage without a stepdown as the Powerbox is a fixed output voltage of 5.8V and 5.3 for the tail.

I think I will just do a complete rest of the unit and see how it goes afterwards.

There has to be something in there fighting each other after the upgrade.

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