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HelicopterThunder TigerOther › JR DS821's Krap?
11-27-2006 02:50 AM  11 years agoPost 21
Jason Bell

rrElite Veteran

California

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YEs best thing ever for a 50. Anything else is overkill.

AMain.com
Mikado "V Team"
Xnova Motors
Optipower USA
RCProPlus

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11-27-2006 02:58 AM  11 years agoPost 22
hrosee

rrApprentice

Richardson, Texas

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In my opinion the 9252 are the best servo for the 50. I have them in both mine and they work great. I did have the JR 821's in them until one failed and you can guess the rest.

Where do you fly? I see you are in Plano. I fly at the Richardson club at Lake Lavon.

Harold

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11-27-2006 03:26 AM  11 years agoPost 23
perfesser zero

rrKey Veteran

Dublin, VA., USA

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Yes...
Are the Futaba 9252 a good servo to have in a 50
the 9252's are the next step up! Now if you can just afford them. I'm running Hitec 5625's in my 50 sized heli and they are doing fine. At $50 a piece they are fast, strong and a bargain.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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11-27-2006 05:07 AM  11 years agoPost 24
VetteintheVeins

rrNovice

Carrollton, TX

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I took everyone's advice and ordered a set of 4 FUT 9252's. At $70 a piece it took care of shipping with no problem. Thanks for your guys help on the servo suggestions.

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11-27-2006 05:14 AM  11 years agoPost 25
danielhv

rrVeteran

Little Rock, AR

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man, i cant afford to buy a new set of servos... Im stuck with my crappy 821's... havent even flown the heli yet, hope all goes well.

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11-28-2006 06:59 AM  11 years agoPost 26
scamp62

rrVeteran

Shermen Oaks, CA

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Do your self a faver……DO NOT FLY WITH THEM !!!!!
Ca you afford a major crash ????

Dimmit..I can stop this anytime I want..no..really I can

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11-28-2006 07:10 AM  11 years agoPost 27
Nick Jones

rrKey Veteran

anderson

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You can get 9252's at ricks for 62$

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11-28-2006 07:35 AM  11 years agoPost 28
VetteintheVeins

rrNovice

Carrollton, TX

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Hey Nick,
How would a person get that price at Rick's? Before I ordered, BTW not from Rick's, I went to check prices there and it showed as 79.99. Is there a special wink or nudge or secret handshake to get the lower price?

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11-28-2006 07:42 AM  11 years agoPost 29
firefox

rrApprentice

Thailand

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That's the price for the bulk (no box) 9252's from rick's. You can get the price if you mail them. Supposed to be the same as the retail one. It was tempting, but I didn't want to go through the process of registering just to find out the shipping cost, so I ordered from heliproz instead, and got free shipping.

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11-28-2006 03:40 PM  11 years agoPost 30
gipper6

rrApprentice

Mckinney, Texas

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Looks like I need to order some of the 9252s

The best way to make a small fortune in RC Helis is to start out with a large one. Debt from above!

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11-28-2006 04:16 PM  11 years agoPost 31
SPB

rrElite Veteran

Athens - Greece

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If they were installed in the aileron it is most likely something was binding. If both links are not EXACTLY the same this makes the servo stalling all the time as it is a push/pull control.


Sotiris
myhelis.com Flying Team

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07-25-2007 03:41 AM  10 years agoPost 32
spaceboy427

rrNovice

new york

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ds821
ds821 servos.. iv had 2 of these fail on me....
one on the ailirons on my rappy 50
and one on my steering for my xlb buggy...
same thing happoned to both...the plastic external round geared part
that mates with the servo horn sheered.
both of them that came with my dx7....
the platic there made of is crap....
iv never had this part fail on any car/heli in 20 years!
nothing was binding and limits were perfect...
there crap!!!!

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07-25-2007 02:51 PM  10 years agoPost 33
jester4

rrKey Veteran

Brampton, Ontario

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Did you use loctite on the screw that holds the horn? I remember reading a blurb somewhere that spektrum claims it is people using loctite and making the nylon weaker that is causing it to shear.

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07-25-2007 03:10 PM  10 years agoPost 34
BarracudaHockey

rrMaster

Jacksonville FL

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This is an old topic but its the vibration and not locktite causing the failures.

JR stated in Feb 07 that they are not appropriate for anything larger than 30 size helicopters.

Andy
AMA 77227
http://www.jaxrc.com

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07-25-2007 03:13 PM  10 years agoPost 35
Quickster

rrVeteran

Victoria, Australia

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Well i have these in my Caliber 30 FT on ccpm and i have done about 15 flights so far with no problem at all......then i found this post. Damn i knew they were cheap, I just didnt think they would be that bad!

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07-25-2007 03:15 PM  10 years agoPost 36
TerranAce007

rrVeteran

Austin, TX

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I've had DS 811's on my Raptor 50V2 cyclic controls for several years now. I got them with my 8103 radio. I ended up getting a 9252 for the collective when I started learing some 3D since the 811 started to struggle. So far they have not given me any problems, but they are probably due for replacement soon. 4 years of mild 3D and several crashes has probably worn them down pretty good. The only one I've had fail was one that was damaged in a crash. I replaced the stripped gears and it worked, but when I later put it on the throttle of my T-Rex, it stopped working in one direction, so I was stuck at full throttle until the gas ran out.

How do you tell when a servo is going bad or reaching its EOL?

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07-25-2007 03:16 PM  10 years agoPost 37
jester4

rrKey Veteran

Brampton, Ontario

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New Guidelines for DS821 Servo Use
Tuesday, February 20, 2007

The DS821 servo is a powerful, accurate sport digital servo recommended for RC airplane applications up to 1.20-size. For helicopters, the DS821 operates best with 30-size glow models, and up to 50-size electric. Loads and vibration in larger models may cause premature failure of the servo resulting in damage or injury to property and persons.

Important: Do not use liquid thread lock with the DS821 servo!

Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear.
I just pulled this blurb on the spektrum site regarding the servos for anyone interested.

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07-25-2007 05:03 PM  10 years agoPost 38
RAK402

rrElite Veteran

Alhambra, CA

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I got a set of DS821's with my DX-7. Based on all the reports of problems with these in helicopters, and JR's warning, I did not install them in my Raptor 30. I went with 8317's.

I will probably just use the DS821's in a trainer or old timer.

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07-25-2007 05:30 PM  10 years agoPost 39
jyrorc

rrApprentice

Poway, CA

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I see that a lot of people recommend fut 9252, but wouldn't fut 9451 be better for the same price. They have a little more torque and speed with metal gears. I am currently running these ds821 and was going to upgrade to the 9451.

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07-25-2007 07:01 PM  10 years agoPost 40
BarracudaHockey

rrMaster

Jacksonville FL

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9451s rock on 6v and they are a nice servo.

Had I put them in my Avant instead of sitting them on the shelf until I had time to tear into it I may still have it today.

Andy
AMA 77227
http://www.jaxrc.com

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HelicopterThunder TigerOther › JR DS821's Krap?
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