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[charlie buoy]

HAVE JUST PURCHASED AN A600 RC SAILING DINGHY, I NEED A STANDARD RUDDER SERVO FOR IT . CAN ANYBODY SUGEST WHERE I CAN GET ONE & WHAT TYPE I WOULD NEED AS I AM NEW TO THIS
                                                                                                            THANKS.

[toesupwa]

HAVE JUST PURCHASED AN A600 RC SAILING DINGHY, I NEED A STANDARD RUDDER SERVO FOR IT . CAN ANYBODY SUGEST WHERE I CAN GET ONE & WHAT TYPE I WOULD NEED AS I AM NEW TO THIS
                                                                                                            THANKS.

Is there any radio equipment in the boat?.. that may dictate the servo you can use...

[Martin (Admin)]

Have a look here: Mayhem's Traders Directory
- http://www.modelboatmayhem.co.uk/links/traders.htm

Q. What servos do I require?

A. Both boats require a standard servo for the rudder. The prototype Skiff employs an RMG 380 drum winch for the crewman and a Hitec Mega sail winch for the sail, the A600, a Hitec HS785 BB drum winch for the crewman and a low profile high torque servo fitted with an arm ( included in the kit ) for the sail. Both boats run on a 6v. AA size battery pack.

http://www.aquataurmodels.com/pages/faq.html

[FullLeatherJacket]

Pretty much any standard servo works with modern RC gear. You can pick up a Futaba or Hitec one for about £7; the unbranded ones are even cheaper.
If you're within travelling distance of Leamington Spa then why not go to the International Model Boat Show in a couple of weeks? Most of the UK specialist model boat retailers will be there and you'll pick up a lot of information (and a cheap servo).
FLJ

[Bryan Young]

There appears to be a lot of confusion regarding the "strength / power" of servos needed to control a rudder.
Many readers of this forum will know that I tend to build large and very heavy models..between 50 and 110lb) Single and twin screw.
Each and every one of them uses a standard servo to control the rudder. It may surprise you, but the rudder is under much less pressure than you may think. In fact, unless you go absolutely bonkers and have a rudder that turns 90* each way (a brake) then a standard servo will do the job. The answer is in the balance of the boat. The model should ideally pivot around its centre of gravity, if you get that right then only a light touch on the rudder will turn anything. I have one model (Baroda) that, because of the hull shape and the upper deck weight distribution, has had to have too much weight added towards the bows. This has made the "pivot" point much further forward than I would have liked. Not ideal. Much more work for the rudder servo, but it copes well enough.
Fit a standard servo (cheap enough) and see how it goes. Cheers. BY.

[John W E]

hi ya there sorry Bryan your calculations are a bit wrong as the guy is talking about servo for a rudder for a yacht and there are a different set of calculations to calculate the turning force - and it is in a different position in a yacht because what you have to bear in mind, are the positions of the mast (which generates a turning/pivot point) plus the resistance of the keel.  Also, one doesnt have the constant flow of propelled water across the face of a yachts rudder plus the rudder isnt always vertical in the water of a yacht, unlike a cargo/normal ship... so, therefore the rudder would be slightly larger on a yacht than would normally be expected; by the none experienced.   One may also need 'not a heavier servo' but the linkage between the servo and rudder may have to be altered slightly.

If one was around modelling when the majority of yachts had vanes on for steering, then one could appreciate the maths which went into the design.

aye
john

[Bryan Young]

hi ya there sorry Bryan your calculations are a bit wrong as the guy is talking about servo for a rudder for a yacht and there are a different set of calculations to calculate the turning force - and it is in a different position in a yacht because what you have to bear in mind, are the positions of the mast (which generates a turning/pivot point) plus the resistance of the keel.  Also, one doesnt have the constant flow of propelled water across the face of a yachts rudder plus the rudder isnt always vertical in the water of a yacht, unlike a cargo/normal ship... so, therefore the rudder would be slightly larger on a yacht than would normally be expected; by the none experienced.   One may also need 'not a heavier servo' but the linkage between the servo and rudder may have to be altered slightly.

If one was around modelling when the majority of yachts had vanes on for steering, then one could appreciate the maths which went into the design.

aye
john

Oops. Thanks John, I missed the fact it's for a yacht, and so my parameters were wrong. Ta. Bryan.

[Mi Amigo]

HAVE JUST PURCHASED AN A600 RC SAILING DINGHY, I NEED A STANDARD RUDDER SERVO FOR IT . CAN ANYBODY SUGEST WHERE I CAN GET ONE & WHAT TYPE I WOULD NEED AS I AM NEW TO THIS
                                                                                                            THANKS.

Popular standard servos include Futaba S3001, Hitec 311, JR NES-577, any of these will be fine for what you need.

The JR NES-591 is just a touch more expensive than the 577 but I have found it to be an excellent servo, I've got loads of them.

I've used them in everything, planes, helis, boats, trucks, cars buggys. I can't fault them.

http://www.servoshop.co.uk/index.php?make=JR

All the best
 Neil

[charlie buoy]

Hi, many thanks for all your messages regarding servos for my A600 sailing dinghy ,will be going out to purchase some that you mentioned & will let you know how I get on with them once ive completed the kit.

[john j]

I have been using JR 591`s in a 200 MPH + jet with no problems