RE: HITEC SERVO FAILURE....PLEASE READ!!  
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 >> RC Airplanes >> RC Warbirds and Warplanes >> RE: HITEC SERVO FAILURE....PLEASE READ!!
Page: <<   < prev  1 [2] 3 4 5 6   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 7:43:16 PM   
F4u5



Posts: 1819
Joined: 1/19/2002
From: Apple Valley, MN, USA
Status: offline 		S1, to me, the point is this:

I love Hitec servos, always have. But, they take a good servo off the market, replace it with one that is failur prone, and then skirt the issue. Ty brings up a good point. Yes, all servos fail, but I would think a replacement servo, such as the 635 for a 605, should be of equal or greater material/life. I find one thing interesteing: the other day, I took a new 605 out of the box. It has a bad pot. I talked to Hitec and they said send it in and they will fix it. No problem. then, they tell me if they cannot fix it, they will exchange it for a 635...not as good a servo. I say, no thanks, I would prefer to pay the difference for a 645 MG.

So, I think the point here is that they are marketing a flawed servo for replacement of a good old perfect 605....and it ain't no good

Sam, I will take a pic of what I am describing.

_____________________________

Where's my glue?.......I gotta build.

(in reply to Edwin)
       Post #: 26

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 8:02:38 PM   
SpitfireMKI



Posts: 1463
Joined: 7/6/2002
From: RAF Turnhouse 603 Squadron, MD, USA
Status: offline 		How long ago was the 65 Mustang convertable discountinued ? Is the new one the same thing ? Is it better ? Point is everything changes.

I still think you need to match the servo to the plane, dollar for dollar, no short cuts. If the new one is not as good, upgrade.

S1

_____________________________

"What madness ? What secrets ? We Plunder,
All failure, We learn from.... Discovery"

(in reply to F4u5)
       Post #: 27

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 8:22:52 PM   
bhole74



Posts: 1072
Joined: 12/16/2003
From: Anderson, MO, USA
Status: offline 		A year or so ago there were a lot of complaints about stripping the gears in the 605's, now suddenly they were a "perfect" servo? I have seen a certian person at our field strip Hi-tec sevos left and right, yet I never have. I do believe mechanical setup has a lot to do with it. I can't believe someone would actually think these are supposed to be strong as metal gears either. If you read the Loctite bottle, it says "not to be used with plastic", I would personally consider the karbonite closer to plastic than metal and therefore not use it. JMHO

_____________________________

Had I known that flight was going to cost me $100 per second, I wouldn't have flown 30 seconds!

(in reply to SpitfireMKI)
       Post #: 28

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 8:25:07 PM   
fockewulf37


 

Posts: 1227
Joined: 3/19/2002
From: kannapolis, NC, USA
Status: offline 		Well If you do a search on the Hitec site. The site says they have a Metal Gear replacement for the 635 for about $7 a pop. I called them back and asked about the replacement. I talked to Steve this time. He checked it out and said that was a miss print and there are no replacement metal gears. I asked him what I should do. Once again I was told I should sell them to someone else...The Karbonite just happens to be brittle. and They could not tell it would be safe to continue to use them in my warbirds because it would be too much of a liability for them.....Plus I was told not to use them with any Gas motor....
What comes next???? If I go to a giant scale flyin do theyneed to start inspecting planes for the 635s???Could they say its too much of a libility for me to fly a plane with 635's on any surface???? This thing could really snowball....

Plus Hitec has already got my money...No need to hepl me now...

ty

(in reply to SpitfireMKI)
       Post #: 29

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 8:37:18 PM   
bhole74



Posts: 1072
Joined: 12/16/2003
From: Anderson, MO, USA
Status: offline 		Here are a few links on the "perfect" 605's
http://www.rcuniverse.com/forum/m_127740/anchors_127740/mpage_1/key_605s/anchor/tm.htm#127740
http://www.rcuniverse.com/forum/m_1332584/anchors_1332584/mpage_1/key_605s/anchor/tm.htm#1332584
http://www.rcuniverse.com/forum/fb.asp?m=1189041&key=605s
http://www.rcuniverse.com/forum/m_728888/anchors_728888/mpage_1/key_605s/anchor/tm.htm#728888
http://www.rcuniverse.com/forum/m_605956/anchors_605956/mpage_1/key_605s/anchor/tm.htm#605956

_____________________________

Had I known that flight was going to cost me $100 per second, I wouldn't have flown 30 seconds!

(in reply to fockewulf37)
       Post #: 30

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 8:58:58 PM   
JohnVH



Posts: 14747
Joined: 12/5/2001
From: Lynden, WA, USA
Status: offline 		Yep, do a hitec search, I wont use them, and dont recommend them. Its JR or Futaba for me. I maidened a buddies 35% Yak with all 5945's, they were notchy, and some didnt center at all.. buy cheap buy twice.

_____________________________

---AIR VH---*FURY FLYER* www.3DFoamy.com

(in reply to bhole74)
       Post #: 31

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/18/2005 9:43:21 PM   
moldmaker


 

Posts: 84
Joined: 11/10/2004
From: lexington, TN, USA
Status: offline 		I just finished a stall test on one of the 635 servoes in my mustang . TEETH STRIPPED pretty easy . As for the 605 nylon gear i flew a bunch of the servoes and the only time i stripped one was when i bumped elevator pretty hard. And they were installed in 30 plus pound airplanes One per surface not TWO

(in reply to bhole74)
       Post #: 32

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 1:35:31 AM   
VKerster


 

Posts: 266
Joined: 12/14/2002
From: highland, MI, USA
Status: offline 		HI GANG, VKERSTER HERE. THE HITEC 645'S DID NICELY THIS WEEKEND, 11 FLIGHTS IN THE T.F GIANT P-51 AND THEY RAN GREAT. APPRECIATE ALL THE COMMENTS, I AGREE HITEC NEEDS TO TAKE RESPONSIBILITY FOR THE 635 ISSUE, AFTER ALL, ABOUT 500,000 RC ENTHUSIASTS USE THE RC UNIVERSE, NEWS TRAVELS FAST.

_____________________________

VKerster

(in reply to moldmaker)
       Post #: 33

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 1:54:37 AM   
F4u5



Posts: 1819
Joined: 1/19/2002
From: Apple Valley, MN, USA
Status: offline 		Nobody said the 605 was perfect, but it was closer than the 635.

_____________________________

Where's my glue?.......I gotta build.

(in reply to VKerster)
       Post #: 34

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 1:55:11 PM   
SpitfireMKI



Posts: 1463
Joined: 7/6/2002
From: RAF Turnhouse 603 Squadron, MD, USA
Status: offline 		TF P-51 ARF $450.00
DA50 - $600
Robart gear- $450
9 Ch TX - $350
MISC junk $ 200

= $2050.00


Hitec 635 Servos: $25 ea. x 7 (A,A,F,F,E,E,R) = $175
Standard BB servo= $15 x 3 (TW,RET,TH) = $45

a smashing $220.00 for servos , what you pay for is what you get.

As far as using the servos in aerobats, yo, this is the warbird section, we're lucky the plane flies let alone precision aerobatics.

S1

_____________________________

"What madness ? What secrets ? We Plunder,
All failure, We learn from.... Discovery"

(in reply to F4u5)
       Post #: 35

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 2:39:46 PM   
bhole74



Posts: 1072
Joined: 12/16/2003
From: Anderson, MO, USA
Status: offline
quote:

ORIGINAL: F4u5

Nobody said the 605 was perfect, but it was closer than the 635.


"So, I think the point here is that they are marketing a flawed servo for replacement of a good old perfect 605....and it ain't no good"
post #29

Seems to me if it was the fault of the gear train, the same gears in the much more powerful servos would have a very much higher failure rate.

_____________________________

Had I known that flight was going to cost me $100 per second, I wouldn't have flown 30 seconds!

(in reply to SpitfireMKI)
       Post #: 36

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 3:42:28 PM   
F4u5



Posts: 1819
Joined: 1/19/2002
From: Apple Valley, MN, USA
Status: offline 		Oooops.....I'm eating my words.....OK...I said perfect, well I guess I'll have to stick with that from my viewpoint. I have probably used over 200 605 servos (I have 48 of them installed in my current fleet) and had only 1 bad out of the box. NEVER had one fail in flight. So, my flight experience with the 605 has been perfect. I'd hazard to say that the Futaba, et.al. servos are really nothing more than a marked up equivalent of chaper brands....after all , they are all made pretty much in the same region....kinda like the Toyota Camry is the same car as the Lexus, but with a different body shell.

_____________________________

Where's my glue?.......I gotta build.

(in reply to bhole74)
       Post #: 37

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 6:31:16 PM   
Big_Bird



Posts: 3237
Joined: 12/18/2001
From: Arlington, TX, USA
Status: offline 		OK guys, I realize that I'm swimming upstream but here is my story and I'm sticking to it. On my 1/3 scale Bücker Jungmeister weighing 27 lbs and powered by a Sachs-Dolmar 4.2, I'm using 3 HS635HBs on the tail surfaces. I have about 40 flights on the plane and no sign of failure. Granted, the next flight could be a disaster but I don't expect it.

Being a single, the 4.2 does some shaking on the tail surfaces. I do not baby this plane and it goes through some pretty violent snaps. One thing may be in it's favor. All three tail surfaces are driven by pull/pull Kevlar cables. The servos are located under the cockpit.

I guess I don't understand (unless it's CYA) a 12 lb airplane weight limit. Why should there be any weight limit on an airplane. It's the air load that should be taken into account, not the plane weight. Air load being due to speed, surface area, and deflection. I guess plane weight is easier to define than air load. My Jungmeister doesn't go very fast and I don't do the snaps at full deflection and full speed.

The servo arm mounting screws are 10 mm and I've never used Loctite or similar product on them. So far I really like the servos.

I also fly a Ziroli Corsair with a Brison 5.8. I would not put these servos on the tail surfaces of this plane. I use 645s on the tail. I think the application for these servos has a lot to do with their longevity and not necessarily the plane weight.

Ken

Attachments
Click to see fullsize image.
Click for fullsize


< Message edited by Big_Bird -- 4/19/2005 6:46:00 PM >

_____________________________

Ken
WACO Brotherhood #70

(in reply to F4u5)
       Post #: 38

RE: HITEC SERVO FAILURE....PLEASE READ!! - 4/19/2005 6:33:58 PM   
Spychalla Aircraft



Posts: 499
Joined: 1/9/2003
From: Watertown, WI, USA
Status: offline 		Thanks for the heads-up on this post! I will have to check my inventory for Karbonite and use them cautiously. I don't think I ever bought any 635 servos because they were low on torque compared to the 605 BB. I love the 605's. Good torque range. Good price.

My son and I have Yellow Spitfires that are just full of them and we fly them hard. Over 125 logged flights for each of us in the last 2 years and not a hint of trouble. By my quick calculations that is 1,000 servo hours calculated as 60 hours of operational time on 16 servos. Not a big sample size but enough to build our confidence. I've used another dozen or so in other airplanes with great performance. The centering issues never shows up on our warbirds. We are pretty precise flyers and I think we would notice it.

Mike Mayberry of Hitec informed me that they made over 1 million 605's through the years. It was a very good servo for them. I am really surprised that they dropped it from there line in favor of the 635. You cannot buy a 605 BB anymore from Hitec, but you can buy a 605 BB branded as a CS-65 from Hobbico. Same thing. I buy CS-65's now. I asked a direct question to Mike of Hitec regarding this and they just said..."Isn't that interesting". See photos of the Hobbico.

Leo


Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize

(in reply to F4u5)
       Post #: 39