DS821's in your 600N

[theLane]

Who is using 821's in their 600N?

Just trying to get a count here. Don't want to start a comparison war.


~Lane

[tungym]

I used them for 1 galloon. Then swap back my BLS451 from my 600E back to 600N. I have some worries of the engine vibration.

The 600 electric should be safe to use the 821. Already there for 12 months and more than 200 flights.

[george0079]

Tech Notes


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.

[wcc963]

i've benn using them in my 600N with no problem, but i only have a gallon through it. i fly with a few people who have them in there 600N's and have had no problems one guy with over 100 flights... but i have read there ratings and have seen them cause a crash so USE THEM AT YOUR OWN RISK.

[theLane]

We've ALL seen the tech notes. I'm not asking if it's OK to use them, just want to know how many people are using them.

[dsmit258]

I had one on throttle ONLY and it failed after about 2 gallons - I would stay away from them on a T600N.......

[aevans692]

I am still using them in my 600pro and have over 50 flights and no probs at all , but then im not doing 3d just starting to do rolls and loops...

I have spoken to lots of guys at my local club about this, and the guys who are using them have had no probs, I said bout them being ok for 30 but not 50 size, I was told that there is not much more vibration in the 50, and that it depends on how you are set up..

I think that if I start to get into 3D I will prob change them up but at the mo I am going to stick with ,

A guy at my club had a s9254 servo go on him whilst up, he lost tail rudder whilst flying. . But that dont mean I am going to rush out and change my tail servos out of my 600pro , raptor coz of what happened to him , any servo can and do go wrong from the most expensive to the really cheap and nasty , I have seen it..

[BarracudaHockey]

Compare the cost of a crash due to a failed servo compared to the price of decent servos and I think you will find its better to get good servos rather than use servos against the manufacturers application reccomendation.

[rototiller]

I had them in my stinger for a case of fuel. I never did get the shakes out of it. I would think if it was gonna fail it would have done it in that bird.

Now there in my 600N. I have over a case of fuel threw the bird now with no problems. I just bumped them up to 6V. Way better than it has ever been. Im not the hardest flyer out there but have really been throwing it around latly. Lots of tic-tocs and pyro flips. There still not fast enough to run the rudder wide open in pyro flips but I have it set to 115 and the cyclic can keep up.

DK

Edit: Just checked and I have 59 recorded flights on the 600.

[Forced_Induction]

this is a really interesting thread. im planning on putting these servos in my 600 once i get it. They came with my DX7, and i need to put them to good use.

[aevans692]

I think that they are fine if your not pushing them hard, Like I said all servos can brake even expensive ones ,

I have a set of Hitec Hs-625mg which have a reasonable spec and are ment for 60 size helis , I put a post on ere bout them a while ago and I was told that there no better than the DS821 so I have held off from putting them in..

But when I asked at my local shop, about the 821 they said that they have not had any probs with them and a few guys have even been asking for them, They told me that the hitec HS-625MG which I have laying around are very good even for 3D , to be honest I dont really know what to do for the best..

I might post again about the HS-625mg find out a bit more ..

[captcasper7]

I would not use the 821's on a 50 nitro, FF ok for a while but flips and rolls you are looking for a failure and a crash, been there done that got the T shirt, so don't kid ur self.

[theLane]

Hmmm.. I have been using them in my Hawk Pro w/OS37. I know it's not a 50, but I have had 3 crashes and they are still fine. This is my experience with them. I like'em and will use them in my 600N when I get it. Just wanted to know how many others are using them as well.

You gotta think that with the number of DX7 sales out there, a lot of people are using them, as not too many are up for sale.

~Lane

[captcasper7]

Originally Posted by theLane

Hmmm.. I have been using them in my Hawk Pro w/OS37. I know it's not a 50, but I have had 3 crashes and they are still fine. This is my experience with them. I like'em and will use them in my 600N when I get it. Just wanted to know how many others are using them as well.

You gotta think that with the number of DX7 sales out there, a lot of people are using them, as not too many are up for sale.

~Lane

Alot of people sell them on as they do not want to use them in anything over a 30 nitro, They want the DX7, but not the servos that come with it.

And yes I have used them and had a failure, shaft broke inside the servo and my heli slipped out of the sky and there was nothing that could be done but watch her crash. Up until that point I was a member of the "OK there is no problem I have run these for one gallon" I wish I had taken note of what others had said instead of only hearing what I wanted to hear.

It is your choice if you use them or not in Nitro 50 good luck. Happy flying.

[lakespinner2]

a fellow at our field was using one on just the throttle (only the throttle) of his raptor 90. the output shaft snapped on his too. I'm not sure how many flights he got out of it before it broke.

[aevans692]

As I mentioned In another post that I have become more concerned about using these servos , I looked them up on the spektrum web page and they state that they are not suitable for any thing above 30 size nitro.. I have emailed them with regards to this servo, will post what the say..

I think that for the time I will fit some hitec HS-625mg till I can afford to get a new set of digital servos, I am thinking about keeping the 821's for the throttle as there is very little resistance there, but not to sure after reading the post above..

[BarracudaHockey]

Its not the load thats the problem its the vibration that seems to be killing them.

[aevans692]

Right.. so they really are no use to me.. ?

[aevans692]

I called round a few shops all over the uk, and I explained my worries about the Ds821 and I was very suprised to hear that none of the shops had heard of the problem, and most people That I spoked to mentioned guys who are using them in 50 size IC with no probs

I spoke to one guy from al's hobbies and he said that " the vibration is only a problem if they are not mounted right".

I am very confused I am prob still going to swap them out but If there was such a big problem with these servos then surly most of the hobby shops in the uk would know about it, or at least one, I must of telephoned about 13 different stores from all over the Uk and not one was aware of the issue with the 821.

please feel free to investigate as I did. I would be interested to see what you guys find out.

[captcasper7]

Originally Posted by aevans692

I called round a few shops all over the uk, and I explained my worries about the Ds821 and I was very suprised to hear that none of the shops had heard of the problem, and most people That I spoked to mentioned guys who are using them in 50 size IC with no probs

I spoke to one guy from al's hobbies and he said that " the vibration is only a problem if they are not mounted right".

I am very confused I am prob still going to swap them out but If there was such a big problem with these servos then surly most of the hobby shops in the uk would know about it, or at least one, I must of telephoned about 13 different stores from all over the Uk and not one was aware of the issue with the 821.

please feel free to investigate as I did. I would be interested to see what you guys find out.

I will depend on how much they know about helis and who you speak to in the shops , some shops also sell planks as well and they have people in the shop that know just about plamks and some that know just about helis, they also have people that know both, but unless you know who you are talking to you may not talking to the right person and you are getting info that is not correct as they are looking for a sale.

Are you a member of a flying club, if so ask the guys what they would use, you will know the ones to ask as they will be the guys that fly very well and can do 3D, don't ask the guys that are just at the hover stage.

Best shops to ring are Skyline ask for Bob. Inwood models ask for Dave, be honest with them as well don't say you are just going to hover with these servo's as they will say they are OK for that, but if you are going to do FFF rolls and flips you want something better.