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HelicopterBeginners Corner › Rudder servo for Trex 450SE V2
11-26-2007 06:37 PM  9 years agoPost 1
pbleic

rrNovice

Boston, MA - USA

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I have searched here and elsewhere for an answer to this and have gotten conflicting info. I am a beginner with simulator and minor indoor heli experience. I am assembling a Trex 450SE V2, and am using 4 HS-65HB servos. My gyro is a 401. Although I have seen postings that say that the 65HB is a good rudder servo, and the specs seem reasonable, the overwhelming number of postings say that a 9650 is best.

My LHS guy says to stick with the 65HBs, and helidirect.com techie says to definitely swap it out.

As a beginner, who will work on hovering etc, wouldn't I be better off with karbonite gears in a $26 servo than nylon gears in a $54 one? I am perfectly happy upgrading when I am ready to do something that requires more responsiveness, but do I need it now???

Thanks for your input.

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11-26-2007 06:55 PM  9 years agoPost 2
mbfjr

rrApprentice

Lawrenceville, Georgia

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To get the best performance out of your 401 gyro I would suggest:
A. Futaba S9257
B. JR 3400G
C. Futaba S9650

You need the speed and frame rate of a digital servo, which is supported by the 401 to get a quick response from the gyro, helps lock the tail in.
It will still work with an analog servo, just not as well.

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11-26-2007 07:06 PM  9 years agoPost 3
Zaneman007

rrElite Veteran

Texas - USA

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If you are just hovering, a HS-65 or HS-81 will work just fine. I doubt that you will notice any difference between these two.

If you are doing 3d, then you probably need a 9650 or better a 9257. The problem is that these servos, IMO are still a bit larger for the 450.

The issue is; for the speed and the amount of torque required to hold the tail in hard 3D moves, you can not find a micro servo to fit the bill.

I have tried the following;
HS-55 - Just for hovering
HS-45 - hovering and some forward flight
HS-65 - forward flight
HS-81 - very very marginal for 3D
Futaba 3154 - for 3D, use 5 volts only or it will burn up (some people have said to burn them up on 5 volts?)
Robbe FF61BB - This worked excellent for about 4 minutes the servo locked up and all I could do was slow turning piros?
Futaba 9257 - I am currently using this. It is big(same size as the 9650 but faster). Makes the tail seem heavy.

Hitec is suppose to be coming out with a new gyro (looks a lot like the 2100), and a tail servo to go with it. It was suppose to be released in October of this year, but I haven't seen anyone selling it? You can find it on there web site.

These are just my opinions and do not reflect the views of other RR members.

Old Guys Rule!

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11-26-2007 11:41 PM  9 years agoPost 4
Way2slow

rrVeteran

Jeffersonville Ga

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I kept getting tail drift and occassional heavy tail twitches when I made sudden moves with the standard servos and 401 gyro. I just installed a 9257 and it's steady as a rock.

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11-27-2007 01:56 AM  9 years agoPost 5
pbleic

rrNovice

Boston, MA - USA

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Twitches with 401

Did you have the 401 set to analog? I have read that this can happen when it is set to digital.

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11-27-2007 03:22 AM  9 years agoPost 6
Way2slow

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Jeffersonville Ga

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It was on analog. I think it was more the servo speed than anything. It only did it if a made a quick move/correction of the tale, then it would make two or three quick, heavy twitches and quit.

I'm running a Scorpion HK 2221-8 motor, 45 amp ECS and seperate BES with 3S 2200 mAH LiPo batteries so I don't have a problem with the tail being heavy. Mine still gives a very slight nose dip when I check if for balance.

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11-27-2007 03:55 AM  9 years agoPost 7
Jonty

rrVeteran

Wellywood

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Go for the best servo you can afford. When it comes to learning to fly, the gyro and its sevro are two of the most important parts of the heli to have right. I have the 9650 and it is the ducks nuts for stick banging 3D. Don't wast time with HS65 etc (other than on cyclic) as once you progress you will only end up swapping it out anyway.

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11-28-2007 01:01 AM  9 years agoPost 8
Gregor99

rrElite Veteran

Western Wa

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Hi all,

I don't mean to hijack this thread. But I have the same question, with a different gyro and helicopter. I have the 2100t on an Esky HBK2 which is a smaller 300 class heli. I currently have the Hitec HS81 and while it seems to work, the tail isn't very solid and there's some wagging I can't get rid of. I had looked at some of the nicer servos on this list above. But since this is a smaller, less expensive heli that is already tail heavy, I wanted to keep the size, price and weight down. Any suggestions on a better servo?

Thanks!

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11-28-2007 01:35 AM  9 years agoPost 9
Gyronut

rrProfessor

Martinsville In.

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Futaba 3153 for my Rex and MT.

Rick

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12-14-2007 12:11 AM  9 years agoPost 10
TONYVAL

rrApprentice

Keyport, NJ - USA

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I have run the following on a TREX SA with 401:

HS50
HS56
HS81
9650
3400G

I have to say my favorite combo for SPORT flying was with the HS56

its plenty fast, light, and I could replace it twice for what the 9650 cost (although I never had to)

for more aggressive flying, the 3400 was great. When I bought a Raptor 30, I used the 401 with 3400 on the Raptor, and it worked well there.

At that point, I went with a GY240 and HS56 on the TREX, and that worked VERY WELL also

HS56 is OK on 6v also

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12-14-2007 12:13 AM  9 years agoPost 11
TONYVAL

rrApprentice

Keyport, NJ - USA

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Oh, also did the S3154 on 6v non digi mode, never had an issue with it

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12-14-2007 01:43 AM  9 years agoPost 12
Flint325

rrApprentice

xxx.xxx

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"mbfjr" hit the nail on the head.
You need the speed and frame rate of a digital servo, which is supported by the 401 to get a quick response from the gyro, helps lock the tail in.
It will still work with an analog servo, just not as well
.
Great advise.

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HelicopterBeginners Corner › Rudder servo for Trex 450SE V2
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