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HelicopterFlybarless Rotor Head SystemsOther › Analog servos
10-30-2011 02:49 AM  6 years agoPost 1
Neon Juripuri

rrVeteran

Peculiar Mo USA

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Is there a flybarless controller that is more forgiving with analog servos? I am leaning towards the Beast-X, but I am also considering Futaba 750 since I have an 8FG TX and I hear they work well together.
The heli I have in mind to make FBL is an old Raptor with " old Hitec 645" analog servos.
TIA.......Fred

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10-30-2011 03:41 AM  6 years agoPost 2
jsenicka

rrProfessor

Eagle River, WI

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645 is not just analog, it is a non coreless very non precision analog. You could get it to work, but you are seriously compromising the potential of any FBL system with those servos.

Jim Senicka
Team Manager, GrandRC Flight Team

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10-30-2011 06:10 AM  6 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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The 750 has an analog mode for all three gyros and the governor. It also has head response to further optimize the data stream for all kinds of servos.

Ben Minor

Team Futaba Team Kontronik USA

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10-30-2011 06:49 AM  6 years agoPost 4
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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Neon,

Most FBL systems let you select your cyclic and tail servo frequency. Most analogue servos like something ~ 50hz. This is the default setting for the BeastX system so you should probably start with this. The next higher BeastX setting is 65hz and you might want to try this since higher is better, but if your servo's get a bit too warm, go back to 50 hz.

Your Hitec 645 cyclic servos should work ok but because these are not very fast servos I'd recommend running them on 6 volts. Hopefully you have a better/faster tail servo and you can set this separately from the cyclic ones.

If I were you I'd stick with the servos you have and see how well they perform. They should be fine for sport flying. If you find that you need better performace the look at faster digital servos.

Cheers,
TomC

Nqx,Mcpx-BL,300x,450x,500x,550x
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx

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10-30-2011 11:11 AM  6 years agoPost 5
Ben-T-Spindle

rrProfessor

Central Illinois

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The Skookum SK-720 or Futaba CGY would be excellent choices. Both have Futaba S-Bus interface to make instillation much simpler and cleaner.

I have both and the SK720 is the easiest to setup with many more features but it is also more expensive. The SK720 is easier to tune. You can’t go wrong with either.

... BTS

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10-30-2011 03:33 PM  6 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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The main thing you need to be sure of is that your servos can stand up to the demands of use when driven by a FBL system. It's not that they can't be made to function correctly for basic sport flying. The question is how long a basic, cored motor servo will last. Just be careful.

Ben Minor

Team Futaba Team Kontronik USA

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10-30-2011 09:10 PM  6 years agoPost 7
Neon Juripuri

rrVeteran

Peculiar Mo USA

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Thanks for the responses.
I havn't really made up my mind what to go with here. But I did realize one thing, Thanksgiving is only a few weeks away. That sometimes means insane sales So I think I will hold off to see what kind of deals come up on flybarless controllers,and let that drive my decision. But I am leaning towards staying with the beast,or Futaba. One of the two.
I am going to have a FBL helicopter before next spring though. One way or the other
I kind of have my eye on these servos also.
http://www3.towerhobbies.com/cgi-bi...XUZ76&P=ML#tech
Only 47 bucks apiece.
Not state of the art. But I'm working on an old beater Raptor here.
We'll see what happens.
Fred

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10-30-2011 11:03 PM  6 years agoPost 8
jsenicka

rrProfessor

Eagle River, WI

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They are not great as far as digital servos either. They do not center well, and are pretty notchy as far as positioning due to being a 3 pole ferrite rather than coreless.
For that money, pick up a set of Align DS610.
For flybarless you want fast, strong and precise. The 5625 are a digital version of the 625/645 and are not precise. Work great on fixed wing, but not ideal on helis.

Jim Senicka
Team Manager, GrandRC Flight Team

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10-31-2011 12:46 AM  6 years agoPost 9
Ben-T-Spindle

rrProfessor

Central Illinois

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I agree Hitec servos are not that good for helicopters. Futaba is the best – you can feel the difference.

... BTS

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10-31-2011 01:06 AM  6 years agoPost 10
koppter

rrApprentice

Virginia

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ditto on the 610s.

dealer cost on the 610's is about $45. They retail for $67. They are often sold on RR for $50 each, new. You can pick them up from different retailers for a little more than $50.

i used a hitec 645 on a retract and it worked fine - where slow and inaccurate doesn't matter.

Ben - you can feel the difference. your wallet will be a lot thinner.

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10-31-2011 06:38 AM  6 years agoPost 11
Adam Landefeld

rrApprentice

Lehi, UT, USA

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I take exception and would offer alternative advice to the blanket statement "Hitec servos are not that good for helicopters". Yes, the older analog ones you have are not well suited to the duty you have planned (throw them in a plank :-), but Hitec does indeed make some phenomenal servos for helis. I personally run and have run their 7940THs for cyclic in all my larger nitros and they are fantastic. I also own futaba BLS252s (in a trex 600) and JR 8917s (in an x50) and JR 8717s which are all great servos so I have "felt the difference" and the Hitecs are what is in my new 90 G4. One of the main reasons for this is that on a duration load test (extremely important in CCPM FBL) the Hitecs are the only ones out of that group that maintained their torque ratings as advertised. The JRs were able to maintain torque when the wire harness was upgraded to a heavier grade wire, the Futaba servos start right on their advertised torque and only fall off a tiny bit over constant load.

As far as the "Hitecs don't center well argument"... maybe true on lower grade versions and certainly a brushless should be more accurate but I have not seen it proved to any satisfaction on the ones I use. We tried to prove it out recently with a digital pitch gauge and a dial indicator (got into a huge argument about centering on our on-road touring car racers, which I use a Savox 1258TG for steering in not Hitec lol) and yes, the Futaba servos centered perfectly every single time (tested the BLS252s and my new BLS256HV tail servo), but so did the 7940THs, the JRs were the only ones that had any issue and it was so minimal that its not worth worrying about.

So... reality is there are a lot of choices for you out there and the affordable options in digitals should really cause you to save a bit more and upgrade your servos. There are a lot of used sets that come up on RR all the time, you can usually grab a set of 8717s for at or around 200 bucks and they would be fine on that machine. I've also run the Align 610s and their Savox 1258TG counterparts and had superior luck with those as well.

BTW, I run the T8FG with the CGY750 on both my 90 and 50 raptors and you seriously would love it. I actually don't have any comparative experience with other FBL units so won't go into any diatribe there, but absolutely love how this one flies and love the utility of being able adjust gain and gov in my radio with menus that totally make sense.

Good luck, spring is a great time for a new heli setup, but don't stop flying during the winter!!!

Disclaimer: before flaming me, the above are my experiences and opinions, not something I read online or heard from one of the "experts" lol!

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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10-31-2011 12:26 PM  6 years agoPost 12
jsenicka

rrProfessor

Eagle River, WI

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Hitec coreless digital are great servos. The 59xx and even better, the 79xx series work very well.
My comments were specific to the 3 pole ferrite powered models (625, 645, and their digital variants)

Jim Senicka
Team Manager, GrandRC Flight Team

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