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JR-Spektrum . Gyro Hobbies . E-flite

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Gasser Model RC Helicopters > Recomended gasser servos.
 
 
Dr. Fibinotchi
Key Veteran
Location: Sioux Falls SD

Just wondered what everyone recomends for a good digital servo. I have JR8311's in them now. They have some pretty sever torque. 150 som Oz. of it. Do I need this much torque or is running like 93 oz ok from another Futaba Servo ok. I am talking about the cyclic.

Thanks
10-13-2003 Over year old.
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

GO for it

yep, the 8311's are probably overkill. Your looking at 9252's, correct? many a fury extreme is pulling SERIOUS 3D action with them......so I would not be concerned myself.
My gasser currently has 8231's in it.....in standard config.

Hope this helps. James

GOOD guy list-39, BAD guy list-0
10-13-2003 Over year old.
 
 
daggit
Elite Veteran
Location: Waseca MN

I'm running Hitec 605's on all but the tail. Cheap and 76 oz torque (plenty for carrying a camera around).
10-13-2003 Over year old.
HOMEPAGE  
 
 
BIGRCR
Veteran
Location: Easley, South Carolina

JR 4131 or 8311's work very well in my gas bird. Of course, the Futaba units work great too.Be very careful with the Hitec 605's, they WILL fail you in a gas helicopter. They cannot take the vibration at all. I believe Hitec now recognizes this.

Use any good quality servo with at least 80 Oz/inch of torque or greater.

Hope this helps!!

BIGRCR- John Garst
10-14-2003 Over year old.
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

HMMMMMM

After having a conversation with a JR tech today (who was checking my 8231's for issues) we have concluded that the excessive lower frequency vibrrrrrration has begun to show up in the 8231's......and we have decided to change them out to 8311's. It was a LONG conversation.
I failed to mention in my previous post that I use Futaba 9202's in my 90 degree CCPM setup in my Benzine EC-135. Primarily for the utilization of a multi-blade gyro, as it will not drive digitals.

James
10-14-2003 Over year old.
 
 
Dr. Fibinotchi
Key Veteran
Location: Sioux Falls SD

update

Looks like Its jr 8311's. They are not super fast, but I will give it an 'A' for strength and smoothness.
10-14-2003 Over year old.
 
 
daggit
Elite Veteran
Location: Waseca MN

BIGRCR

Thanks A LOT! You just cost me 400 bucks.... you know I can't continue to fly with this new information.

All I will think about is how those servos will fail any minute (been flyiing them for a year now)... time to order some 8311's
10-15-2003 Over year old.
HOMEPAGE  
 
 
BIGRCR
Veteran
Location: Easley, South Carolina

Sorry, but I too tried to go the Hitec route a good while back, despite my fellow pilots' suggestions and I had them fail on me. Everyone that I know that have used them have had the 605's fail (even in airplanes). After much discussion with Hitec (finally about their recommendations NOT to use them in helicopters), I got the 605's replaced with some 525's to use on throttle and these too failed. It's JR and or Futaba only for me now!



Later,

BIGRCR- John Garst
10-16-2003 Over year old.
 
 
daggit
Elite Veteran
Location: Waseca MN

well, you don't have to be sorry... I wanna know. Too many dollars flying around up there to take chances.

do you have any other suggestions for RELIABLE servos? It is for a camera ship, there is no hotdogging done with it, just up and down easy flying. I just want as close to BULLETPROOF as possible without spending any more than is needed. The 8311's are 99 bucks a piece... is that overkill?

Thanks man!

Ethan
10-16-2003 Over year old.
HOMEPAGE  
 
 
daggit
Elite Veteran
Location: Waseca MN

Quote 
quite some time


I've been flying for a year with the 605's with no problems but I am reconsidering any info on how long, how many flights?
10-16-2003 Over year old.
HOMEPAGE  
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Daggit

Pay once, cry once. I thought my 8231's were gonna be fine.....not according to the latest from my service tech, so 8311's it is. The Futaba 9252's are around 70 bucks or so from heli-hut.....and they would do fine for your tasking. I will have 2 sets of 8311's as soon as the set comes back from Horizon. One set is in a scale glow 60.....the other.....well, I have the gasser up for sale now....so maybe they go into a new ship. It is just not worth the risk, even for a pod and boom machine.......

Sorry to be the bearer of bad news.....but you would rather read it than SEE it !

James
10-16-2003 Over year old.
 
 
daggit
Elite Veteran
Location: Waseca MN

I totally agreee... I won't be risking my heli any longer. Time for a servo upgrade.
10-16-2003 Over year old.
HOMEPAGE  
 
 
Philmo55
Heliman
Location: South Wales , UK

Hi Everyone,
I've got JR 811s in my Vario benzin .Do you know if these are suitable. I'm a novice at this.

Phil
10-20-2003 Over year old.
 
 
Dr. Fibinotchi
Key Veteran
Location: Sioux Falls SD

servos

My buddie is using 8311's in his Benzin and has never had a problem. Look for something about 100 oz or torque or more would work and up. 9450 Futabas, 8311 JR, 9252 Fut even would all work. You just dont want to have a reall week servo like 50oz or torque trying to pull the cyclic around on a big bird.
10-21-2003 Over year old.
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Phil

you are running 90 degree CPM, correct??

The 811's MAY do it for a while.....but not the optimum choice. Call JR and speak to Bruce in the repair department. Tell him what you have, and get an opinion from him. It is worth the long distance charges IMHO. Tell him I suggested that you call. Here is a segment from JR's web page about the 811......read closely the first sentence:


"The DS811 is an excellent choice for sport servo applications, such as the new crop of .40- to .60-size pattern airplanes or .30-size CCPM trainer helis like the Venture™ 30CP. Matching it with a 4.8V battery pack yields an impressive 54 ounce inch of torque-nearly 34% more than the leading non-digital sport servo. With a 6.0V pack, torque numbers run as high as 66 ounce inch."

I don't think your benzine trainer falls within those parameters.....even with 90 degree CCPM.

Time to seek an alternative IMHO. See above posts.


James

GOOD guy list-39, BAD guy list-0
10-21-2003 Over year old.
 
 
Philmo55
Heliman
Location: South Wales , UK

AGRAV8,
Thanks for the advice you obviously know a bit about this servo business. When I get this Dauphin finished the Benzin will be going into it. I will proberly use a multy blade gyro to help me fly it. What servos would you recommend? I use a PCM10X.
Great people on this site. BRILL!!!!!!!
10-22-2003 Over year old.
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Phil

the vario multi blade gyro will NOT drive digital servo's. Hence, you are kinda limited from the latest crop of goodies......

I have Futaba 9202 servos, 90 degree in my benzine.....which came out of a dauphine, and is going into an EC-135. The torque is enough....and few can dispute the reliability of the futaba 9202. It has been taking the worst we can do to servo's for a long time now.

Alternative servo in the JR line......4721 or 4121. Non digitals.....they would work also.

I have a multi blade gyro myself.....can't decide if I want to use it or not.

remember, swashplate timing setup is different for MB gyro VS standard......

Hope this helps.

James
10-23-2003 Over year old.
 
 
Philmo55
Heliman
Location: South Wales , UK

James

Thanks for that .Proberly go for the 9202s as you suggest. How difficult is this 5 blade set up to do on the head?????
10-23-2003 Over year old.
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Its tough

but can be done. Control rods are critical going from swash to the bladeholders. I would work with swashplate only to start, making sure that there was no interaction with the 4 servo's on the swash. Blade balance is also a big deal. They GOTTA be correct, overall weight, spanwise, chordwise.....
spool it up on the ground, and start checking tracking. Different color/position of tracking tape can help find the one(s) over or under the others. Here is a great resource for the head setup, also they have a section on the multi blade gyro.......

http://www.variocanada.com/Technica...ems%20setup.htm

Read thru this and see if it doesn't help answer your questions......if not, come on back......there are several guys here with more talent setting these up than I have...

James
10-23-2003 Over year old.
 
 
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