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HomeAircraftHelicopterAlignOther › newbie - help with servos
03-09-2008 05:15 AM  10 years agoPost 1
KRAR

rrApprentice

Chicago,Illinois

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im not new to heli but am new to the 600N

what JR servos would you put in this machine for a beginner?

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03-09-2008 05:18 AM  10 years agoPost 2
george0079

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USA

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I'm not very familiar with JR servos, but if they have anything close to the Futaba 9252 or 9451, that would be the way to go.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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03-09-2008 05:21 AM  10 years agoPost 3
Simmer

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Massachusetts

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8311

http://www.rcaerobats.net/JR_Servos.htm

I dont know thats a hard one. Im a JR gu and I got the best 8717 and love them, but a beginner, not like you cant benifit from really good servos, its just that the fast ones dont come cheap and anyone can appreciate a fast servo. Futaba has a larger selection. I like the futaba 9252 9254

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03-09-2008 05:23 AM  10 years agoPost 4
KRAR

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Chicago,Illinois

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what tail servo would you recomend and which gyro?
an 8311 for the engine would be fine?

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03-09-2008 05:34 AM  10 years agoPost 5
Simmer

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Massachusetts

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Oh sure the 8311 on throttle would be fine, I uses a futaba 3151 on throttle. It doesnt have to be fast but I think if you dont have a gov a faster servo on the throttle is a ery good thing.

http://www.servocity.com/html/futaba_servos.html

I think a 401 combo with the matched servo 9253 (9254 now) is fine but.... again even though you may be a beginner, a really good tail servo gyro is very benificial. Im about to go with the JR770 with the 8900 servo. I think for the money its work the extra bucks over the 401. The other thing is the 401 is an older gyro and there are better out there now. The 770 is much better than the 401 and about the same price.

So bottm line here is my take.

You want as fast as you can afford. If I have to spend 74 for a good servo, Ill spend the extra 25 each for the best servo.

Cyclics look for torque of 70 min and speed of .14 at 4.8 volts
Also if its ccpm three servo you want precision. You want them to return to the same point every time and be consistant as they (3) work together

throttle well no gov at least similar speed .14 and torque not as important 50 around there should be good.

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03-09-2008 05:35 AM  10 years agoPost 6
george0079

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USA

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Gyro... JR 770/8900G combo or the Futaba 401/9254 combo.

The 8311 is a bit overkill for the throttle but it will work fine.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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03-09-2008 09:43 AM  10 years agoPost 7
MJHiscott92504

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James Hiscott , Germany for past 11 months

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Servo Futaba BLS451's)
I would not use the JR8717 Servo's on a 600N 50 size model, dont get me wrong here, the 8717 are a fantastic cyclic servo however imo they are over kill for a 50 size heli. I know that veteran pilots will agree with me here when I say that the 8717 servo's are better suited for a 90 size heli that require mass power! To date and with my 32 years of RC experience behind me tells me that one of the best cyclic servo's I have ever used hands down is the Futaba BLS451's They are extremely fast and strong and the 2 massive crashes that I had with them sustaining no damage tells me that they are as well extremely durable. This is an opinion only however I believe an educated one....Jim

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03-09-2008 03:34 PM  10 years agoPost 8
Simmer

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Massachusetts

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You may be right about overkill, but he was asking about JR servos
Now overkill aside, for 6 bucks more per servo..... Why not have JR servos which are faster and have more torque?
BLS451 99.00 JR8717 105.00

Metal case makes them better for heat disapation and crash damage. Its NOT as big a battery drain as some have said. Really I see 300ma or less used per each flight. Why not spend the extra 15 for faster more powerful servos?

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03-09-2008 04:41 PM  10 years agoPost 9
TerranAce007

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Austin, TX

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You can't go wrong with 9252s. I would say 9452's because they are a newer version with metal gears and rated for 6V, but the 9252 is an awesome servo for the price. Check out Heliproz, they offer a bulk discount if you buy at least 3, which is what you need anyway. The 9452 is only a little bit more.

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03-09-2008 05:11 PM  10 years agoPost 10
MJHiscott92504

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James Hiscott , Germany for past 11 months

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Simmer
You have a point Simmer, and to ad to your point I had a thought that I did not think about last night, If he does go ahead and get the JR8717 when he goes to a 90 size heli in the future he will already have the perfect 90 servo's, he would have the option to not have to go out and buy stronger servos. I try and see everyones points and views. Anyhow for myself right now I am a 50 size flyer and its BLS451's at this time. happy flying....Jim

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03-10-2008 12:59 AM  10 years agoPost 11
KRAR

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Chicago,Illinois

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if i ever went to a 90 size heli... maybe in three or four yrs they will have somthing else out by thenn... im a 20 yrold with a budget... as to wat budget.. something that wrks well and can take a little bit of a beating... ive been in the hobby long enough to know... dont go with the ones that do the minimum but to go AT LEAST mid- range

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03-10-2008 01:07 AM  10 years agoPost 12
Simmer

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Massachusetts

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Tell you what James, I think a 50 is the perfect size heli. A 90 would be nice but not very fuel efficient and cost efective as I know (while its been a long time between mishaps for me, its always in the wings) if/when something goes wrong, its much more affordable to repair a 50 than a 90, and a 90 won't do anything more than a 50 can, for me anyway.

On a budget, (can deal with Futaba as opposed to JR) I think the 9252s are about $75, 9254 is about $109.00 8717 is about $105.00
You can save $25 per servo 9252 for a savings total of 75.00. the performance hit is probably something you wont notice much anyway.
.15 (9252) vs .09 (8717)

Better to spend the 75.00 savings on a top tail servo 8900 with the 770 gyro/

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03-10-2008 03:41 AM  10 years agoPost 13
MJ12

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Snohomish WA

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JR8717 Great servo for the 600N overkill yes but later if you ever go to a 90 size ship then you can use them in that with no issue yes they cost alot but in the end its all about fun!
Dave

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03-10-2008 03:54 AM  10 years agoPost 14
TerranAce007

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Austin, TX

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9252's are $70, and 9452's got for $75-$80. For performance on a budget, you can't beat the 9252. Many people run them at 6V, so other than the metal gears they are similar in performance to the 9452. I run the 9252 on my 600N and they work great. 8717's would be nice, but you could use the money you'll save with 9252's and get a governor or something else you need...

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03-10-2008 05:33 AM  10 years agoPost 15
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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I'm not sure if JR has a comparable $70 servo to the Futaba 9252, which is a great servo.

But if you have to have a JR servo, try the 8317. It's what Curtis Youngblood has in his 600N (saw it with my own eyes), and I now have them in my 600N, and I am very happy with them.

They are precise, they are fast, and they are very quiet. They are much less power hungry than the 8717s which are overkill. And you don't need upgraded dual-voltage power systems to keep your heli from browning-out and smacking in!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-10-2008 07:16 AM  10 years agoPost 16
RonHill

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FLL, FL

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KRAR
what JR servos would you put in this machine for a beginner?
I know you asked for JR, but I would really recommend the Futaba 9452's. I have 9252's and I have stripped gears in flight. The 9452's are metal geared 9252's. They cost about 80 bucks a piece, thats only 5 bucks more per servo.

If you have to have JR...I would get DS8317's, but they are 99.00 a piece and less of a servo IMO.

DS8317: 84oz, .12sec.
9452: 127.8oz, .11sec

Now, if you can, get 8717's...They just flat out rock and you can tune the heli down for just starting out and then crank it up later.
what tail servo would you recomend and which gyro?
The 401/9254 is OK but when you start to do piro's it is lacking. Right now my favorite setup is the Curtis Solid G and a 9256 servo. It will cost about 100.00 more than the 401, but I think it is easily worth it...I like it better than my 350.00 Futaba 611.

As for throttle servo...Well I run an old cheapy JR DS811's in my Trex and in my Vibe. They work fine.

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03-10-2008 03:07 PM  10 years agoPost 17
Simmer

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Massachusetts

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Curtis can fly the pants of most of us with a cheap 531 servo

DS8317 Digital Hi-Speed MG Heli Servo Specs
Type: Digital High-Speed
Torque: 69 oz/in @ 4.8V, 84 oz/in @ 6V
Speed: .15 sec/60° @ 4.8v; .12 sec/60° @ 6.0v
Dimensions (WxLxH): 0.75"x1.54"x1.36"
Weight: 2.0 oz
Bearing: Dual Ball Bearing
Motor Type: Coreless
Gears: Metal

$99.00

DS8717 Ultra Speed Cyclic Servo Specs
Type: Ultra Speed Heli Cyclic Servo
Torque: 160 oz/in @ 4.8V; 196 oz/in @ 6V
Speed: .09 sec/60° @ 4.8V, .07 sec/60° @ 6V
Dimensions (WxLxH): .83" x 1.59" x 1.57"
Weight: 2.36 oz
Gears: Metal

$105.00 ($109.00)

Come one man, why would you do that? look at the specs here!
He is starting out, and wants a JR servo. Your right there is not a JR servo comparable to the 9252 (or similar servo) for the money.
Also notice the 8717 is designed FOR Heli cyclic.

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03-10-2008 03:19 PM  10 years agoPost 18
Simmer

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Massachusetts

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Rock buddy, dont be spreading rumors
And before we go back and forth, let me say this is not a personal attack, its based on my own experience. Your mileage may vary.

This guy is a beginner and not doing hard 3d anyway.
And you don't need upgraded dual-voltage power systems to keep your heli from browning-out and smacking in!
huh? You must be talking about using a nicad for the heli as opposed to a regulator,Lith type battery, which I think he already has?

I took a long while to come over off the nicads to regulated power but it is the way of the future and I dont expect to ever go back to nicads again. If your starting out, you may as well join the regulated crowd.

I will say this. If you ARE using a simple nicad, then your correct, dont buy these 8717 servos.

if your running regulated power its a non issue (at least on a 50) Simple Li Ion and reglulated power. Done!

If you have 8717s and you find they are sucking power I would say look closely at the restiction on the control surfaces. Its not a big deal. The disclaimer that everyone seems to hop on is based on a 90 sized ship with more load on the servos/3D making it work harder.

Duration is not the issue, your talking momentary load. If you have these 8717 on your ship, then you must have some numbers to back up what your thinking here.

I have them and I dont see this as an issue. If your going to run LiPolys its Defineatly a non issue as they handle the momentary pull much better.

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03-10-2008 03:19 PM  10 years agoPost 19
JRjoe

rrElite Veteran

Jonesville , IN USA #1

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I know he asked for a JR servo. Heck i'm a JR guy myself. But here's a servo i really like too...

Hitec 5965MG
Torque: 111.08oz (8.0kg) @ 4.8V 132oz (10kg) @ 6.0V
Speed: 0.13 sec @ 4.8V 0.10 sec @ 6.0V

About $80.00 each if you look around. I've used them in 90 size helis with great success.

Just another option......


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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03-10-2008 05:25 PM  10 years agoPost 20
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Rock buddy, dont be spreading rumors
And before we go back and forth, let me say this is not a personal attack, its based on my own experience. Your mileage may vary.

This guy is a beginner and not doing hard 3d anyway.
Wow - this guy seems to know a lot about me for someone who lives on the other side of the country and has never met me!

Well, I don't spread rumors. I was in TX with Curtis and Brian at CYE this past January, and he had JR 8317s in his Trex 600N.

Just the facts, jack!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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