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10-22-2009 04:07 AM  8 years agoPost 1
ckombo

rrApprentice

Boston, MA USA

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Is the GY520 jsut as easy to use and program as the 401?

Is it that much better?

What are the pros and cons?

I will be using it on a trex 500...

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10-22-2009 05:50 AM  8 years agoPost 2
Dr.Ben

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Richmond, VA, USA

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A modest amount more effort is required to set up a 520 because the gyro has more functionality and adjustability than the 401.

For about 5-10 minutes more set up time with the 520, you'll be rewarded with far superior hold and piro consistency versus the 401, especially when it's paired with a BLS251.

Buy one. You'll love it.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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10-22-2009 02:43 PM  8 years agoPost 3
davehour

rrElite Veteran

Guayama, Puerto Rico 00785

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Hi Ben:

In all of the Futaba gyros before the GY520, their instructions books say the tail of the heli should be trimmed mechanically in hover, with the tail servo at 90 degrees, and gyro in normal mode. Then, we can switch to heading hold, and back to normal.

The GY520 instruction booklet says that if the user is going to use heading hold mode only, the best setup is attained by having the tail servo set at 90 degrees with 0 degrees in the tail rotor blades. Futaba even recommends to use the gyro in heading hold all the time.

The GY520 booklet says the procedure to trim the heli tail mechanically in hover is only required if the user wants to use the gyro in normal mode too.

Would you second the GY520 booklet recommendations?

Thanks.

David

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10-22-2009 06:01 PM  8 years agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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No.

Current recommendations "in the field" and from Futaba Japan ESPECIALLY support trimming the tail mechanically with a 520. It can have a major effect on piro consistency and improves overall hold as well.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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10-22-2009 07:05 PM  8 years agoPost 5
freakyreef

rrKey Veteran

Kansas\Colorado border

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Without a doubt. Trim the tail mechanically.
Still using a 9254 with my 520 and its still much improved over the 401 and 9254.
FWIW, check which version of the manual you have. I picked up my 520 from the first shipments. The manual is different than the online and new manuals I have seen.
The first revision was a bit foggy on setup and some other info. The manual I downloaded was MUCH better.

Walk on water long enough, eventually you will get your feet wet.

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10-23-2009 02:17 AM  8 years agoPost 6
Kevin Dalrymple

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Indianapolis

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Current recommendations "in the field" and from Futaba Japan ESPECIALLY support trimming the tail mechanically with a 520. It can have a major effect on piro consistency and improves overall hold as well.
+1 on that. Big improvement.

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10-23-2009 03:19 AM  8 years agoPost 7
Heli Davey

rrApprentice

springfield,mass

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Gy520 rocks!!!can handle any thing you throw at it!!

*TREX 500ESP*TREX 600NSP*TREX 700N LE*

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10-23-2009 04:08 AM  8 years agoPost 8
ckombo

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Boston, MA USA

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What is better,

Spartan or GY520?

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10-23-2009 11:50 AM  8 years agoPost 9
davehour

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Guayama, Puerto Rico 00785

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Thanks for the update guys!

Although I'll make the apprpriate adjustment with the above information, let me tell you the heli tail is like an arrow with 90 degrees on servo and 0 degrees on tail. No drift. Rock solid.

David

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10-23-2009 12:09 PM  8 years agoPost 10
davehour

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Guayama, Puerto Rico 00785

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Hi:

As I said, I'll now trim the heli mechanically in normal mode.

Just for reference, I downloaded the current GY520 manual from the Futaba site and it still has that silly 90 degrees on servo horn, 0 degrees on tail blades setup as the optimun setting for AVSC use(page 27, first paragraph, last sentence).

David

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10-23-2009 02:34 PM  8 years agoPost 11
chopper_crazy

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Delphos, Ohio

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I used the 401 for a long time until my skills progressed then it started to kick out on tail moves. I have 2 futaba 520 with the futaba bls251 servo on the tail. That combo rocks. Never a single issue. I would say programming wise, the 520 is just a little bit harder to do but if you read the instructions its very simple.

It's a complex, costly, glow powered anti-gravity machine!

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10-26-2009 10:17 PM  8 years agoPost 12
HybridHeli

rrApprentice

East Texas lawman

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Just for reference, I downloaded the current GY520 manual from the Futaba site and it still has that silly 90 degrees on servo horn, 0 degrees on tail blades setup as the optimun setting for AVSC use(page 27, first paragraph, last sentence).
It’s not silly, you need to do that to ensure equal left-right throw. In normal mode you will want a mechanical trim but for heading hold use only, mechanical trim is irrelevant (in terms of performance) as the gyro will move the servo as it needs to in order to get the hold or piro rate called for. You just need to make sure and have a centered servo and a ZERO pitch on the blades to be able to use the FULL left-right throw of the tail pitch (for head hold mode).
If you trim mechanically for neutral hover then you are telling the gyro that THAT mechanical offset is your center point and you will get a non-symmetrical throw (more throw in one direction than another).
Although I'll make the apprpriate adjustment with the above information, let me tell you the heli tail is like an arrow with 90 degrees on servo and 0 degrees on tail. No drift. Rock solid
You have it OK for heading hold use.

__________
nothing automatic about autorotations man..

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10-28-2009 12:03 PM  8 years agoPost 13
davehour

rrElite Veteran

Guayama, Puerto Rico 00785

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HybridHeli:

Thanks for your input.

What we're talking about in this topic is the mechanical trim is still need to be done to make the gyro work properly even if we are going to be using heading hold only. The instructions of doing the 90 on servo horn, and 0 degrees on tail, mentioned in the book, are not correct, being that what Ben Minor seconded when I asked. Notice when he mentions that Futaba Japan recommends the trimming to be done.
Current recommendations "in the field" and from Futaba Japan ESPECIALLY support trimming the tail mechanically with a 520. It can have a major effect on piro consistency and improves overall hold as well.
I flew my Titan SE this weekend after I did the hover trim in normal mode. Then, I put all the flight modes in HH back again. Now, the heli does piro better and right and left piros are at the same speed, and a bouncing tail problem the heli had when stopping the tail after pirouetting to the right, is gone.

David

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10-28-2009 05:53 PM  8 years agoPost 14
HybridHeli

rrApprentice

East Texas lawman

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Got you..thanks
Manufactueres recomendations are always best

__________
nothing automatic about autorotations man..

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10-28-2009 07:52 PM  8 years agoPost 15
RAK402

rrElite Veteran

Alhambra, CA

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I have set the GY520 up both per the instructions and mechanically trimmed it in "Rate" mode.

The tail seems to hold better and the pirouette rate seems more even when it has been set up in "Rate" mode first.

As far as the GY520 vs. the Spartan goes, I really cannot say. I have one Spartan on my Trex 250 which holds that, occasionally, troublesome tail pretty well.

I have 10 GY520's (nine installed). I find the 520 a bit easier to set up than the Spartan, but I have had nine times the practice on the 520.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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10-28-2009 11:04 PM  8 years agoPost 16
smallplanes

rrElite Veteran

S.C. ,SSA

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Dang thats alot of gyros you must love those 520's. I like the Spartan but i've never had a 520.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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10-29-2009 01:13 AM  8 years agoPost 17
ErichF

rrElite Veteran

Sutton, NH

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The reason you should set the mechanical tail neutral in rate mode is so that the correct anti-torque blade pitch is set as neutral. Only from that point is the tail rotor performance linear left and right of center. We all know that a heli doesn't fly with no yaw with the tail blades at zero pitch. So, if the zero yaw position is not set as the mechanical zero position, you can easily see how you would have consistency and drift issues.

The hard part is balancing this neutral position to cover a wide range of RPMs, should you fly with them. Tail neutral at 1450RPM is not the same at 2100RPM on the same bird.

Erich

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10-29-2009 01:16 AM  8 years agoPost 18
RAK402

rrElite Veteran

Alhambra, CA

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Erich,

Thank you for explaining that. I new that setting it up in rate mode, mechanically worked-I just was not sure why.

Now I know!

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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10-29-2009 11:50 AM  8 years agoPost 19
davehour

rrElite Veteran

Guayama, Puerto Rico 00785

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Erich:

I thought about that, and I chose 1700 to set the mechanical trim. From there, switching to 2000, the tail almost kept the same.

Thank you very much.

David

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