IOM rudder servo - RC Groups
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Jul 27, 2012, 10:15 AM
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A.B.'s Avatar

IOM rudder servo

So what is the ideal torque and speed for and IOM rudder servo. Type suggestions welcomed!!

I am in the process of planning out my next build and this time I would like to do it as right as possible, and still on a tight budget?

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Jul 27, 2012, 10:29 AM
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I have a futaba 3004 servo in one of my IOM's for rudder servo. Thinking about switching to a to an S3050 rudder servo if I change servos. Ryan
Jul 27, 2012, 10:34 AM
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iom rudder servo

go with the S3003 futaba servo for less than $10ea. you can afford to get an extra or two.
Jul 27, 2012, 10:52 AM
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8387mike's Avatar

Great cheap servo no fancy stuff and reliable-Last boat one of these, my current boat 2 hitec's
Jul 28, 2012, 08:10 PM
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Originally Posted by sullyelvis
go with the S3003 futaba servo for less than $10ea. you can afford to get an extra or two.
If you buy one good one, you never need to buy two.
I can't speak to the Futaba servo, as all of my boats use Hitec.. so I'm not saying that the S3003 is junk...
Just saying you never need to overbuy if you buy the right thing.

I'm using the Hitec HS-311 in all of my boats (2x EC-12, 3xMarbleheads). It's a good standard servo. $7.99
Last edited by breakwater; Jul 28, 2012 at 08:17 PM.
Jul 28, 2012, 09:25 PM
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A.B.'s Avatar
I am using the 311 right now in my IOM, What i was really wondering is if i need to get a faster servo or highter torque?
Jul 28, 2012, 10:18 PM
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Nope. IOM rudders are pretty easy to turn. Good linkage will help a lot. Ryan
Jul 28, 2012, 10:23 PM
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Well, The IOM is smaller than the Marblehead, and much smaller than the EC-12.
So, I'd say without a doubt that you do not need higher torque than the HS-311. (HS-311 is 51oz/in) If anything that means you can get away with less.

In terms of speed, that's a little more of an opininion question.
Do you want your rudder to turn faster?

The HS-311 is plenty fast enough for me in both the M and EC-12 applications.

If money is not an object, I'd say go with this servo.. The HS-5086WP.
It's Micro Sized, It's light, it's waterproof, it's digital.

But, It's 50 Bucks.
Jul 28, 2012, 10:31 PM
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Originally Posted by A.B.
I am using the 311 right now in my IOM, What i was really wondering is if i need to get a faster servo or highter torque?
Your question suggests you may not be happy with the 311 servo in your current boat perhaps?

IMHO you do not necessarily need "fast" for rudder servo as good rudder use should be primarily "smooth" - only making minor corrections to avoid the "braking" effect of the rudder thus keeping your speed and momentum up.

Regarding "torque" - if you are concerned that your rudder servo may be stalling under high load consider the following:
a) get a stronger servo
b) are you using push/pull linkage? Single link may be flexing when pushing, this is eliminated with push/pull
c) deliver more torque (but less travel) to the rudder by using the appropriate holes in servo arm and rudder horn to gain a mechanical advantage
d) As mentioned elsewhere, watch for binding or rubbing linkages, rubber boots that do not compress easily when cold, tight/binding rudder shaft - things like that...

Jul 29, 2012, 03:17 AM
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ToniGe23's Avatar
Buy a decent servo that will centre spot on every time most of the more expensive servos use a water/dust proof seal between the cases which is what I use.
Jul 29, 2012, 11:30 AM
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A.B.'s Avatar
Thank you for all the advice, I do not have issues with the 311, i just thought some of the better boats were using a higher grade of servo. So as I plan my next build i was just trying to work out the servo's i need to purchase.

At my first ever IOM regatta a couple of weeks ago in Hood River Oregon it looked to me that some of the top boats were turning faster (with out braking) than me, I guess this could also be the operator or hull/fin shapes?


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