RunRyder RC
 7  Topic Subscribe
WATCH
 1 page 932 views POST REPLY
Scorpion Power Scorpion Power
HelicopterAlignT-REX 600N › 821 on throttle
12-13-2008 10:49 PM  8 years agoPost 1
spencer737

rrApprentice

Canada

My Posts: All  Forum  Topic

Hey guys! How many of you are running the DS 821 for your throttle servo. I know these servos have problems of breaking but is it an issue when it is just for the throttle.
How is it holding up long term?

Spencer
Esprit Model Flight Team

PM  EMAIL  GALLERY  Attn:RR  Quote
12-13-2008 10:56 PM  8 years agoPost 2
Heli 770

rrProfessor

USA.

My Posts: All  Forum  Topic

Shaft on the servo has been breaking with throttle usage were there is the most amount of vibration. You can let us know how long it lasted.

PM  EMAIL  Attn:RR  Quote
12-13-2008 11:42 PM  8 years agoPost 3
bmapope

rrVeteran

TN

My Posts: All  Forum  Topic

This servo should never be installed on a .50 size nitro bird anywhere! They have numerous posts here, even the manufacturer saying nothing over a .30 size nitro or .50 electric. I have personally experieced this servo failing on throttle.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-13-2008 11:58 PM  8 years agoPost 4
Avropilot

rrVeteran

Murfreesboro, Tennessee

My Posts: All  Forum  Topic

Acually there is a way to tell whether you have a good or bad DS821. To test them you need to get a bucket then fill it up with water. Toss the servos in one at a time. If it floats it's a good one. I personally have never seen one float.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-14-2008 12:02 AM  8 years agoPost 5
spencer737

rrApprentice

Canada

My Posts: All  Forum  Topic

alright Ill try the bucket test LOL
Will be switching it out before 1st flight
thanks for the heads up guys!!

Spencer
Esprit Model Flight Team

PM  EMAIL  GALLERY  Attn:RR  Quote
12-14-2008 01:11 PM  8 years agoPost 6
BarracudaHockey

rrMaster

Jacksonville FL

My Posts: All  Forum  Topic

LMAO Avro thats awesome!

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

PM  EMAIL  GALLERY  Attn:RR  Quote
12-15-2008 09:40 AM  8 years agoPost 7
helinelly

rrVeteran

st.helens england

My Posts: All  Forum  Topic

i hate these servos

i hate these servos 821'S because what they did to my baby 600 ha ha he he.........stay well away from putting these servos on any heli...
...regards helinelly

PM  EMAIL  GALLERY  Attn:RR  Quote
12-15-2008 04:14 PM  8 years agoPost 8
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

My Posts: All  Forum  Topic

i thought it was common knowledge to use longer screws in the horns of the 821s because of the breakage issue. the stock screws only extend 3mm into the 6mm deep output shaft. as a result vibration causes the output spline shaft to break off right where the screw ends.

use a longer screw that bottoms out the splines and you're fine. there's no reason you can't use them on a 50-class machine for basic/sport flying....especially on throttle.

if it ain't broke, break it.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-15-2008 04:20 PM  8 years agoPost 9
helinelly

rrVeteran

st.helens england

My Posts: All  Forum  Topic

[quote] cudaboy_71
use a longer screw that bottoms out the splines and you're fine. there's no reason you can't use them on a 50-class machine for basic/sport flying....especially on throttle.

this all depends on how much money you have to keep fixing your helis.......use the 821's in a 50 and you will lose fold stop...
sports flying or not

kind regards helinelly

PM  EMAIL  GALLERY  Attn:RR  Quote
12-15-2008 04:22 PM  8 years agoPost 10
Heli 770

rrProfessor

USA.

My Posts: All  Forum  Topic

Someone had posted He used the longer screw on the throttle servo(because that was the fix), doing maintenance on his Heli it fell off.

PM  EMAIL  Attn:RR  Quote
12-16-2008 05:31 AM  8 years agoPost 11
Avropilot

rrVeteran

Murfreesboro, Tennessee

My Posts: All  Forum  Topic

It's not the screws but the motor. It just quits working without warning.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-17-2008 03:05 AM  8 years agoPost 12
bmapope

rrVeteran

TN

My Posts: All  Forum  Topic

i think spencer737 whom asked the question got the point ...DON"T FREAKIN" USE "EM!!

PM  EMAIL  GALLERY  Attn:RR  Quote
12-17-2008 04:57 PM  8 years agoPost 13
Mike Fortin

rrElite Veteran

USA

My Posts: All  Forum  Topic

If you use a longer screw you should be fine.

On a side note I have used HS-81 minis on my throttle for over 2 years and have yet to have one fail. I should also mention that I am running them on 8V (although I don't reccomend it).

Have Rotors, Will Fly!

PM  EMAIL  GALLERY  Attn:RR  Quote
12-18-2008 11:47 PM  8 years agoPost 14
tacoturbo

rrApprentice

Kauai, Hawaii

My Posts: All  Forum  Topic

Hey wait a minute! I did do that bucket test and mine floated....for 2 seconds. The only downer was I did it in the toilet and so far no one I know wants to retrieve it for me. Dang it!I wouldn't risk any heli on these servos. IHO they do not belong on anything that flies.

TT

I don't do 3D....no wait. Oh thats right, I can't do 3D!

PM  EMAIL  GALLERY  Attn:RR  Quote
12-19-2008 12:25 AM  8 years agoPost 15
alchemist

rrVeteran

Auckland,New Zealand

My Posts: All  Forum  Topic

Acually there is a way to tell whether you have a good or bad DS821. To test them you need to get a bucket then fill it up with water. Toss the servos in one at a time. If it floats it's a good one. I personally have never seen one float.
The basic bucket test has produced some reasonably acurate and consistent results, however the accepted hardcore test is the "30% Nitro Bucket Test".

All you do is fill a bucket with 4 liters of nitro, drop your fully functional new DS821 in, stand back and light. Once the nitro is spent and the fire is out, if the DS821 is still functional then you have good one

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-19-2008 02:18 PM  8 years agoPost 16
BJames111

rrElite Veteran

San Diego, California

My Posts: All  Forum  Topic

don't bother with them. Put them in a plank you don't care about. The plankers seem to have had better luck with them.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-24-2009 05:24 AM  8 years agoPost 17
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

I witnessed another one of these servos fail today at the field. It was in a Raptor 30, sport flyer, actually barely a sport flyer, maybe hoverer would be a better description. No crashes and the servo (throttle) failed. The shaft broke off right below the servo horn.

I think they should put a warning on them not to use them with a heli.

Jeff

To hover is divine, the alternative is rather PLANE.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-24-2009 10:12 AM  8 years agoPost 18
alchemist

rrVeteran

Auckland,New Zealand

My Posts: All  Forum  Topic

Don't be a victim...

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 932 views POST REPLY
Scorpion Power Scorpion Power
HelicopterAlignT-REX 600N › 821 on throttle
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Tuesday, October 17 - 3:09 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online