RE: Hitec 5955 ?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> RE: Hitec 5955 ?
Page: <<   < prev  1 [2]

Login
Message << Older Topic   Newer Topic >>
RE: Hitec 5955 ? - 9/20/2007 6:55:09 PM   
MikeMayberry



Posts: 2864
Joined: 1/15/2002
From: Poway, CA, USA
Status: offline

quote:

ORIGINAL: bobog

Please forgive me as I am not trying to beat a dead horse. This is my first large plane, ok large for me, and I just want to keep it as safe as posible. Based on what my understanding was from this post there were a few people that were going to do it even though it was outside of the waranty and would be getting back to the forum regarding it. I was just wondering if anyone had yet.

I am running 5 5955 servos in my 86" Yak and running 2 Fromeco regulators, this is not an issue for me I was just wondering if I could eleminate one more potintal fail point in my system by removing the regs.

Basicaly what I geather is even if my regs fail for some reason and the servos take the full voltage of a Li-ion it would NOT fry them emediatly and I would be able to get my plane to the ground safely and most likely without issue. I generaly verify the voltage of my regs every other time I charg the Li-Ion batteries and I am running everything through a Smart-Fly Power Expander EQ. It sounds like I am safe.



Is my understanding correct?


That is correct. The 5955's can handle an unregulated 2 cell Li-Io/Po battery with no problems and many people are using them succesfully this way. However, Hitec does not support this usage since the life of the servo is reduced by aproximately 30%. There is no doubt though, that the 5955TG are proving to be increadibly durable and reliable so some are willing to take the risk since the lifespans of the 5955's are so good.

If you do decide to go this route be aware that you will void the warranty of the servo and Hitec in no way authorizes this usage.

Mike.


_____________________________

Hitec RCD Rep
http://www.hitecrcd.com

(in reply to bobog)
       Post #: 26

RE: Hitec 5955 ? - 9/21/2007 4:25:15 AM   
XJet


 

Posts: 3465
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: online
bobog, if you want to eliminate points of failure (ie: regulators) without risking your servos, dump the Lipos and fit some A123 packs.

Just about all the large-scale/3D fliers I know (including myself) are now running 2-cell A123 packs with *great* results.

The unloaded voltage of these packs is 6.6V and they hold that voltage for around 95% of their rated capacity which means you get maximum torque and speed even on a pack with as little as 20% of its charge remaining.

They can also be recharged from flat in just 15 minutes and will deliver 30C (75A) continuously -- or 100A for up to 10 seconds.

And... they're not at all fragile (electrically or physically) like Lipos. Unlike Lipos, if you accidentally overcharge them they won't burst into flames (possibly taking your plane, car or even your house with them).

At around $40 per pack (2300mAH) they even work out cheaper than LiPos with regs.

_____________________________

When I'm not here, I'm at RCModelReviews

(in reply to MikeMayberry)
       Post #: 27

RE: Hitec 5955 ? - 9/21/2007 5:11:54 PM   
bobog



Posts: 24
Joined: 11/16/2005
From: Mount Vernon, WA, USA
Status: offline
XJet,

That sounds like it may be a plan, where would you recomend picking them up from, do you have a web site?

(in reply to XJet)
       Post #: 28

RE: Hitec 5955 ? - 9/21/2007 7:59:27 PM   
Bass1



Posts: 1780
Joined: 12/26/2002
From: Va.Beach, VA, USA
Status: offline
Got this from another forum.>I get mine from http://bigerc.com/. He builts nice packs and I don't have to fuss with soldering and taking a dewalt pack apart after spending time looking at ebay. But that is just me. Once you sign up on the website, you'll see the discounted prices.

(in reply to bobog)
       Post #: 29

RE: Hitec 5955 ? - 9/21/2007 8:17:57 PM   
bobog



Posts: 24
Joined: 11/16/2005
From: Mount Vernon, WA, USA
Status: offline
Thanks

(in reply to Bass1)
       Post #: 30

RE: Hitec 5955 ? - 9/27/2007 9:10:15 PM   
jonkoppisch



Posts: 1932
Joined: 12/17/2001
From: Wilmer, AL, USA
Status: offline
Troy built is posting about testing the 5955 servos "I regret to report that the Hitec HS-5955 lost 40% of its torque by dropping from 248 oz-in to just 152 oz-in in about 60 seconds" which isn't anywhere close to advertised strength.... Is hitec working on this or?? The 8711 posted by troy built JR-8711 has an initial torque of 358 oz-in, and after 60 seconds (of intermittent use) the case heats up to 120 deg F and the torque drops off to only 280 oz-in "JR-8711 has an initial torque of 358 oz-in, and after 60 seconds (of intermittent use) the case heats up to 120 deg F and the torque drops off to only 280 oz-in!"... Is hitec working on anything to compete with them??

Added: I'm pro hitec and hope that hitec steps up... I do know of a few people that have subbed the 8711 in place of their 5955 and have been able to achieve extremely better rudder authority...

< Message edited by jonkoppisch -- 9/27/2007 9:12:40 PM >


_____________________________

xps and a flash = NO MORE FLASH...
http://www.youtube.com/watch?v=m2HxRNgkjpQ

(in reply to bobog)
       Post #: 31

RE: Hitec 5955 ? - 9/28/2007 1:10:30 AM   
BaldEagel



Posts: 4232
Joined: 10/12/2005
From: Wychling, Kent, UNITED KINGDOM
Status: offline
I think the drop in torque and the temprature is not the most inportant thing to come out of that test, its the current draw that has supprised most, I was taken to task when I said that I could spike draw 15amps from my 5955's and told I did not know how to build or set up a plane, Quique has drawn up to 22amps on his, so I suppose he can't build either. LOL.

Mike

< Message edited by BaldEagel -- 9/28/2007 1:11:09 AM >


_____________________________

No matter what anyone says 100% is the maximum you can get.

(in reply to jonkoppisch)
       Post #: 32

RE: Hitec 5955 ? - 9/28/2007 8:41:36 AM   
XJet


 

Posts: 3465
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: online
To me, the 5955's strongest feature is the titanium gearset.

When I want *real* torque, I go for a Seiko or other 1/4-scale servo, not a "standard" sized unit. I mean, just look at how much stress there is on the tiny mounting screws, output shaft and case of a "standard" servo when it tries to pull 22Kg/cm of torque. Expecting a consistent, reliable, usable level of torque from such a small case is a silly thing to do.

If you're using a servo that delivers this amount of torque it's obviously going in a plane that is large enough that a couple of extra ounces for a proper 1/4-scale servo isn't going to make a whole lot of difference (and yes, I fly 3D gassers so I am aware just how weight-conscious some fliers are).

What I like about the 5955s is that they have "enough" torque for most applications and the gearsets just don't seem to wear at all.

If you're dumb enough to buy a ultra-hi-torque JR servo, you'll spend half your life replacing servo-gears to stop the damned things from shaking like a drunk with the DTs.

The 5955s have proven to be "fit and forget" servos that work just fine for me in all my bigger planes.

_____________________________

When I'm not here, I'm at RCModelReviews

(in reply to BaldEagel)
       Post #: 33

RE: Hitec 5955 ? - 9/28/2007 12:15:58 PM   
jonkoppisch



Posts: 1932
Joined: 12/17/2001
From: Wilmer, AL, USA
Status: offline
I just put 5 of them in a carden edge... You're saying that I need more or 1/4 scale servos instead??? Everyone payed for 333 tq oz and we're getting 150 tq oz.... The lack of slop and programming are a couple of reasons that I've bought so many hitecs over the years. I have a ton of digital hitecs laying here but I'm very dissapointed with this review and the performance...

_____________________________

xps and a flash = NO MORE FLASH...
http://www.youtube.com/watch?v=m2HxRNgkjpQ

(in reply to XJet)
       Post #: 34

RE: Hitec 5955 ? - 9/28/2007 12:33:04 PM   
BaldEagel



Posts: 4232
Joined: 10/12/2005
From: Wychling, Kent, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: jonkoppisch

I just put 5 of them in a carden edge... You're saying that I need more or 1/4 scale servos instead??? Everyone payed for 333 tq oz and we're getting 150 tq oz.... The lack of slop and programming are a couple of reasons that I've bought so many hitecs over the years. I have a ton of digital hitecs laying here but I'm very dissapointed with this review and the performance...


Using a five cell battery (Sub C 3300Mah) on the 5955's I have not had a problem, the only way to rearly know if you have a problem is if you are getting blow back on the control surface's, if your roll rate decreases with speed or even stays the same then you are probably getting blow back, my JR servos have stripped gear trains and therefore are not used anymore. Hitec 5955's gear trians just don't seem the wear out. I think on may occasions we go with the hype on power needed for small aircraft (50cc and below), obviously 3D has put much greater strain on our servo's especially with the advent of Expo as I tend to fly around with the 3D rates in most of the time, switched out for take off and landing.

The torque specs on manufactures sites tend to quote figures that are taken at a very small moment/lever arm from the servo centre, so using the Tx end point settings to get maximum throw from the servo is almost essential, then just adjust the attachement point on the surface horn to get the throw you need, this give the best mechanical advantage to the surface whilst reducing the torque reaction (smaller lever arm) on the servo arm/gears. Works for me anyway.

Mike

_____________________________

No matter what anyone says 100% is the maximum you can get.

(in reply to jonkoppisch)
       Post #: 35

RE: Hitec 5955 ? - 9/28/2007 12:46:44 PM   
jonkoppisch



Posts: 1932
Joined: 12/17/2001
From: Wilmer, AL, USA
Status: offline
I'm very familiar with that. The 5955 and 8711 were tested in exactly the same way and hole position & you basically got 1/2 what you paid for. Have you read the article??? They basically say that if you want to do any hard maneuvers to do them within the first 60 seconds because after that you loose 40% of your torque....

_____________________________

xps and a flash = NO MORE FLASH...
http://www.youtube.com/watch?v=m2HxRNgkjpQ

(in reply to BaldEagel)
       Post #: 36

RE: Hitec 5955 ? - 9/28/2007 12:54:33 PM   
BaldEagel



Posts: 4232
Joined: 10/12/2005
From: Wychling, Kent, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: jonkoppisch

I'm very familiar with that. The 5955 and 8711 were tested in exactly the same way and hole position & you basically got 1/2 what you paid for. Have you read the article??? They basically say that if you want to do any hard maneuvers to do them within the first 60 seconds because after that you loose 40% of your torque....


Yes I have read the article when it first appeared, but I reiterate getting half of what you pay for is only a problem if you need all of what is advertised, I don't get blow back on my 5955's so obviously I am getting sufficient torque, even if it is half of what I paid for, the 8711's I belive use the same gear train as the 8611's that have had a problem, but to each his own, time to move on I think.

Mike

_____________________________

No matter what anyone says 100% is the maximum you can get.

(in reply to jonkoppisch)
       Post #: 37

RE: Hitec 5955 ? - 9/28/2007 1:01:43 PM   
jonkoppisch



Posts: 1932
Joined: 12/17/2001
From: Wilmer, AL, USA
Status: offline
quote:

but I reiterate getting half of what you pay for is only a problem if you need all of what is advertised


Why else would you spend extra to get that torque??? If I only needed half of that I'd have bought the 5625's.... That's hilarious!!! It's like paying for a Porsche and getting a Yugo...... But the Yugo got you where you wanted to go..... Something's wrong there right???? I kind of suspected that the servos lost a little torque after a bit. I have a 3m comp arf extra and I put 1 5995 on the rudder, which according to torgue ratings should have been enough. I noticed after flying for a bit that it seemed less powerfull but it still did most of what I wanted. It did really show though in a knife edge circle... If the plane would have been heavier it would have failed to hold it at all. I talked several of my friends into getting the hitec. Another friend also said that he had serious issues with knife edge circles (horizontal) with a couple (he had 2 or 3, I'll have to ask him again) of 5955's on his carden 40% extra rudder. It wouldn't hold...

< Message edited by jonkoppisch -- 9/28/2007 1:04:00 PM >


_____________________________

xps and a flash = NO MORE FLASH...
http://www.youtube.com/watch?v=m2HxRNgkjpQ

(in reply to BaldEagel)
       Post #: 38

RE: Hitec 5955 ? - 9/28/2007 1:18:22 PM