Model Boat Mayhem

Dry Dock / Shipyard: Builds & Questions => Pleasure boats, Sports, Race, Power and Leisure Boats: => Topic started by: dougal on May 07, 2011, 10:01:12 PM

Title: best/worst metal geared servos
Post by: dougal on May 07, 2011, 10:01:12 PM
If there is one piece of RC kit that makes sure your boat does exactly what you tell it to, its the rudder servo...
Recently, I had to replace my rock-solid Futaba S3305 servo.
As the Futaba is a bit pricey, I decided to try a cheaper hi-torque, metal-geared servo from a different manufacturer only to find significant play in the gearing. So, still looking for a bargain I bought another inexpensive servo from another manufacturer - same problem...
Why sell a hi-torque, metal-geared servo that allows the rudder to flap about!
Anyone had similar experience and/or got any recommendations?
 
 
Title: Re: best/worst metal geared servos
Post by: gregk9 on May 07, 2011, 11:19:43 PM
I dare say your attempt now by buying 2 servo's would of equalled the price of the original Futaba one..............

Unfortunately quality does not often bond with a low price these days.

Sometimes the only way to help reduce the backlash is to use twin link rods to/from the servo horn to the rudder, rather than just using a single one.
Do you use single or twin on your setup?
Title: Re: best/worst metal geared servos
Post by: dougal on May 07, 2011, 11:56:24 PM
Yup - mugged twice! :((
The boat has a direct, twin armed link from servo to rudder which had no play whatsoever with the Futaba servo....the 'wobble' is in the gears of the cheaper servos.
I was wondering a) are there are any budget servos that work as they should? and b) it might be of help if we exchanged info based on our experience of different makes/models.
It does seem that 'you get what you pay for', but there're always exceptions.
Title: Re: best/worst metal geared servos
Post by: Subculture on May 08, 2011, 07:13:32 AM
Have you tried Hobbyking? I've found their servos are excellent quality, and are inexpensive.
Title: Re: best/worst metal geared servos
Post by: essex2visuvesi on May 08, 2011, 08:30:13 AM
Yup - mugged twice! :((
The boat has a direct, twin armed link from servo to rudder which had no play whatsoever with the Futaba servo....the 'wobble' is in the gears of the cheaper servos.
I was wondering a) are there are any budget servos that work as they should? and b) it might be of help if we exchanged info based on our experience of different makes/models.
It does seem that 'you get what you pay for', but there're always exceptions.

Never mind.... was talking rubbish
Title: Re: best/worst metal geared servos
Post by: Timo2 on May 08, 2011, 09:58:03 AM
Hi All

    Servo detail try look at     http://www.servodatabase.com/

    or read the reviews on   http://www.rcmodelreviews.com/

   Timo2

     :-))
Title: Re: best/worst metal geared servos
Post by: andyn on May 08, 2011, 10:33:50 AM
Savox are about the best going at the moment.... You get what you pay for....
Title: Re: best/worst metal geared servos
Post by: w3bby on May 08, 2011, 10:39:03 AM
Anyone ........ got any recommendations?

I use Hitec servos http://hitecrcd.com/products/digital/digital-sport/index.html (http://hitecrcd.com/products/digital/digital-sport/index.html) and like them a lot. I use a digital for steering although that is not absolutely necessary. The Sävox http://www.servoshop.co.uk/index.php?area=servo&make=Savox&title=Savox+Servos (http://www.servoshop.co.uk/index.php?area=servo&make=Savox&title=Savox+Servos) brand are used by some of the FSR-V crowd and have had good reviews.
Title: Re: best/worst metal geared servos
Post by: Subculture on May 08, 2011, 10:44:48 AM
I should have added that their is a wide variation between models. One of the best guides are the customer reviews which are at the bottom of each product on the HK website.

Another good page on the 'rcmodelreviews' site is this one-

http://www.rcmodelreviews.com/chineseservos1.shtml

There are good inexpensive servos and bad ones. I got some servos from HK which feature a digitally controlled amplifier, coreless motor, titanium gear set and a magnetic encoder instead of a potentiometer. They are the smoothest and most powerful sevos I have ever encountered, and cost under a score each.
Title: Re: best/worst metal geared servos
Post by: timsenecal on May 08, 2011, 05:35:36 PM
There are good inexpensive servos and bad ones. I got some servos from HK which feature a digitally controlled amplifier, coreless motor, titanium gear set and a magnetic encoder instead of a potentiometer. They are the smoothest and most powerful sevos I have ever encountered, and cost under a score each.

link or model number for these mystical servos?
Title: Re: best/worst metal geared servos
Post by: Subculture on May 08, 2011, 06:04:30 PM
There are about five models of these servos available from HK. This link shows the top end version, which is super powerful and fast-

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=14830

Andy
Title: Re: best/worst metal geared servos
Post by: tmbc on May 08, 2011, 09:58:02 PM
hi
savox are good servo's and reasonably priced for there quality ! i use multiplex rhino digi 4 on my rudder and smaller multiplex on throttle    or savox for both if limited for space !

at the end of the day you get what you pay for ! i have tried cheapies mg995 etc etc etc the multiplex have been going 2 yrs with no problems ! the savox i have used for about a year even putting 2 in a heavly modified traxxas revo for steering where others have failed these are still up and running ! only had 1 fail due to partly my own fault but cml replaced it no problem
 
Title: Re: best/worst metal geared servos
Post by: dougal on May 13, 2011, 10:05:05 PM
Thanks to you all for the advice - just taken delivery of a Power HD DS090M servo. There is a small amount of play in the gears but it is much faster than the other servos I have tried (including the Futaba S3305) and the torque is good. Tomorrow morning the boat will be back on Mote Park lake and I'll see how it works.
Having spent so much on all the other components, if the Power HD doesn't measure up I'll be buying a top-of-the-range Savox.
Title: Re: best/worst metal geared servos
Post by: tmbc on May 14, 2011, 11:54:07 AM
hi m8
no need to buy top of range savox ! the cheap n mid are really good checkout sc0251 there slightly larger than standard but have 16kg torque at 6v !!! i use two of these in a highly modded revo  ! they stand up to a lot of punishment. at £28 quid they dont break the bank !
 

http://www.servoshop.co.uk/index.php?pid=SAVSC0251&area=Servo