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Aerobatic FAI F3C Contest > Futaba 9255 servo

seattle_helo
Key Veteran
Location: Washington State, USA

Hello all. I'm curious how many of you flying FAI/F3C are using 9255 servos? Those who have been using them for a while, what have your impressions been?
Thanks.

nick

01-26-2006 Over year old.

HOMEPAGE

GM1
Elite Veteran
Location: Tallahassee, Florida US

9255

I switched to 9255s last year at the beginning of the year so I have a full season on them. On my CPPM model, I find that they hold center better than the 9252s, that is, you do not have to tweak your mixers to hold the swash level nearly as often. They have a very good "feel" in hover and gear wear seems nominal. My new Stratus FAI is getting them also.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

01-26-2006 Over year old.

nighttrain
Senior Heliman
Location: Louisville KY

I believe the general opinion is they're the best thing since sliced bread. I use them in a non ccpm set up, mech mix, and they are quick, powerful, reliable. You won't be sorry. Doug

01-27-2006 Over year old.

Phaedrus
Senior Heliman
Location: South Orange County, California

I'm using them as well. Everyone gets all hung up on speed and power and you never hear anything about centering. The 9255 centers like a champion!!

Reality is Subjective. At least that's what I think!!

01-27-2006 Over year old.

Shortman
Key Veteran
Location: Clovis, California

Hmm, compared to the 9252s do they center that much better?

01-27-2006 Over year old.

happyfly
Senior Heliman
Location: HK

I have been using 9252 for few years on all control of my F3C machines. The last batch has been serving me for not over 70 flights, but the center position is no longer reliable as the VR around the center wear out so quickly due to large amount of input during hovering. They can't find its center position and keep moving back and fore for less than a second when you apply a litte force on the servo arms at the center position, including cyclic and throttle. I wonder if the new 9255 is better than 9252 with respect on this issue.
Thanks.

Cheers, Happyfly

01-29-2006 Over year old.

Shortman
Key Veteran
Location: Clovis, California

Sounds like you have dirty pots in your servo, which will cause that exact symptom you describe.

01-29-2006 Over year old.

happyfly
Senior Heliman
Location: HK

i am not sure. I just suspect the VR has problem leading the oscillation around the center position.

investing all new gears with 9255 costs so much.....but i will do it these days and get my 9252 repaired by Futaba later on.

Cheers, Happyfly

01-29-2006 Over year old.

Wayne Mann
Senior Heliman
Location: United States of America

Hi guys,

Simply put the S9252 servos are low grade dog food compared to the S9255 servos. Even the S9151 pattern servos are far superior to the S9252. The S9255 servos have performed flawlessly in all four of my contest machines. Futaba is going to have a tough job in my opinion making a better servo than this one. Remember the Porsche add which says: Porsche...there is no substitute. Thats how I feel about these servos.

I hope this helps

Wayne Mann

01-31-2006 Over year old.

seattle_helo
Key Veteran
Location: Washington State, USA

Gentlemen, many thanks for your opinions and insights.

nick

01-31-2006 Over year old.

HOMEPAGE

Shortman
Key Veteran
Location: Clovis, California

Wayne, when just looking at the stats the 9255s are rated a slower servo? Any notice of this at all in flight? Are the 9252s not coreless like the 9255s?

01-31-2006 Over year old.

NoKaOi
Heliman
Location: Orem, Utah, USA

Wayne,

How exactly are the 9255 servos superior? I have seen many comments about how they perform better. Due to these comments, I just purchased 3 new 9255's to put in my ECCPM machine in hopes that the jumpy spots in my collective will be banished forever. I don't really notice it when flying around, but when I am trying to lock into a hover, the 9252's (I'm assuming that's the problem) seem to have spots in their travel that has almost no servo movement relative to stick movement, but then at some future point they seem to want to play catch up (it is small and difficult to see, but it is there and very noticeable in a hover). This characteristic is extremely frustrating.

All 9252's are new, with a new R5014 receiver and 14MZ TX. Is this the problem you were having?

Is there better electronics/motor in the 9255?

Thanks,

Maui

01-31-2006 Over year old.

Wayne Mann
Senior Heliman
Location: United States of America

Yes Stephen the S9252 servos are corless, but they do not have the performance of the S9255s. The S9255s are slightly slower, but that means less than nothing to contest pilots as just about all of us run quite a bit of expo trying to slow down the servos around center.

Maui the S9255s center much better, they don't develop excess free play around center like the S9252s and it's much easier to set up a CCPM model with them because their total throw distances between multiple servos is much closer than the S9252s.

Maui as for your collective problems I would say you need to look at the transmitter first as servos typically don't do anything that they are not told to do. It sounds to me like you have something going on in the transmitter or the helicopter. How old is the helicopter? Have you checked the thrust bearings in the blade grips lately, because if those bearings are rough and pitted it will cause a notchy or sticky feel in a hover on collective. The S9252 servos hover very well when you manage to get three of them to track together.

I hope this helps

Wayne Mann

02-01-2006 Over year old.

NoKaOi
Heliman
Location: Orem, Utah, USA

Wayne,

Thank you for your response. The Helicopter is only a about 6 months old with exactly 108 flights on it. It is a Joker 2. All equipment was new at time of build, including the 14MZ.

You bring up something that I suspected might be the case, but thought that the odds would be against it. When I noticed under precision hovering that my collective seemed a little notchy, I disconected the swashplate from the head completely. I then disconected the servos to make certain that there was no binding. I then reconnected the servos only (not the head) and began spending the next hour observing movement of the collective. All servos track extremly well but all of them exhibit the identical problem I posted in the earlier post, at the same place along the collective stick travel. It was easier to see once I knew what to look for. Even with the servos disconected, the problem could be seen in the servo wheel itself.

I then engaged the servo test in the radio to see if the result would be the same without using the stick. It was not. The servos all traveled perfectly through their range with no skips or notches. I thought to myself that it was unlikely a VR on the stick, just because the odds were against that. But when I proceeded to use the collective stick, the problemed was evident.

I contacted Futaba service and following my explaination to him, I asked if they were experiencing this with any other radio. He said no. I wrote a long letter to accompany the radio expaining everything I have said here, but I withheld sending it in when I began reading every post on RR about the 9255. I saw your comments in several posts and began thinking it may just be a servo issue. that is why I just picked up 3 new 9255's from the hobby shop Saturday.

It sounds as if I may indeed need to send in the Radio. I am concerned however that they won't take the time to observe things closely.

02-01-2006 Over year old.

Wayne Mann
Senior Heliman
Location: United States of America

Hi Maui,

Start a brand new program from scratch. Put in the model type and fill in the swashplate menu stuff manually. Do not copy anything from you existing program. Do not go into pitch curve and set anything. Just to the swash menu and reversing menu to get the servos traveling in the right direction. Now move the collective stick up and down and see if you still have the same problems. If the problems are gone you have something messed up in you programming; probably something in the pitch curve menu. If the problem is still there then there is most likely something wrong that the service center will need to fix.

I hope this helps

Wayne Mann

02-01-2006 Over year old.

NoKaOi
Heliman
Location: Orem, Utah, USA

Wayne,

Thank you. I will give it a shot. Easy enough.

Maui

02-03-2006 Over year old.

MasterCrash
Senior Heliman
Location: Gassaway, Tennessee

9155/9255 metal gear futaba servo alert.

I have witnessed for the second time now an expensive heli plumeting to the ground due to the servo horn setscrew backing off.
The first time was a club member and I passed it off as bad luck and lack of loctite [if your using metal gears you'd better use it], the second time was even more disturbing, the guy used blue loctite and still within a few tanks the AVANT 90 bit the ground FFF it's over a grand in damages, so blue loctite the servo arm set screw is NOT ENOUPH? I guess red or green is in order. This is pretty hard to blame on the mechanics that are building them at this point, The other club member was flying a raptor for the first test flight and the arm popped off, Now it's a CRAPTOR 90

He wont fly the 90 again with futaba's metal gear servos knowing that blue loctite was not enouph, the heli is grounded till the servos are replaced all together. IF you use these; green loctite the monsters and inspect your stuff diligently every flight. Of course these are the new digital metal gear servos The Raptor 90 had the 9255 servos and the AVANT had the 9155's

Does this mean Futaba is junk? NO WAY!!But the old days of nylon gear and care free setting of the servo horn dry with no loctite are over,
This DOES mean our modus operandi is going to change when it comes to installing the servo horns.

And I thought that I Would never CRASH!!!

01-22-2007 Over year old.

yapjy
Key Veteran
Location: Singapore

Try using spring washer on the servo horn screws.

01-22-2007 Over year old.

GM1
Elite Veteran
Location: Tallahassee, Florida US

another thing

AS Wayne said, we having been using the 9255s since they came out with good results. The biggest thing I notice is how strong these servos are immediately off center. You always get a very positive immediate response. The second thing is they seem to hold up very well over time, that is, they hold the same center and maintain a speed match whereas the 9252s changed center and endpoints slightly over time and required that you reset your mixes to eliminate the interactions that creeped in. With the 9255s, I haven't had to do that.
I can't wait to get the new brushless TR servos so I don't have to wait and let the TR servo cool down betweeen flights when I am testing something. Did you ever wonder how good these things are going to be in 5 or 10 years?
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

01-23-2007 Over year old.

seattle_helo
Key Veteran
Location: Washington State, USA

Guys, bringing this back from the dead just to see if everyone still has the same enthusiasm for the 9255. Is it still as good as ever in your minds or has something surpassed it, like the brushless 351?

nick

02-03-2008 08:40 PM

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Aerobatic FAI F3C Contest > Futaba 9255 servo

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