Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[Liam]

Ive just finished making a yacht in my college course and am now going to fit the servos to control the rudder and also turn the mast the only servos i can find that would do this arehttp://www.modelmaniacsonline.co.uk/products.php?ProductID=1321 and are £40 are there any cheaper links appreictiated 

[triumphjon]

ive looked at the site although your link isnt working , but im unable to find the servo under the part number that you are showing ? do you have any other detAILS , IE MAKERS etc ?

[Liam]

http://www.modelmaniacsonline.co.uk/products.php?ProductID=1321   try copy and paste this :)

[wartsilaone]

Check out Cornwall model boats or Westbourne models.

[dodgy geezer]

Ive just finished making a yacht in my college course and am now going to fit the servos to control the rudder and also turn the mast the only servos i can find that would do this arehttp://www.modelmaniacsonline.co.uk/products.php?ProductID=1321 and are £40 are there any cheaper links appreictiated  

That's not a bad price for a two-channel with servos, but you can find cheaper.

But first we need to know what you need. With yachts you often need a specially powerful winch servo to control the sail. You say you are 'turning the mast' - I'm not sure how you're going to do that, but I wouldn't be surprised to find that you need quite a powerful servo - more powerful than your rudder servo...

What you will need for a yacht is:

1 transmitter (27Mhz, 40 Mhz or 2.4Ghz)
1 receiver to match
1 rudder servo
1 sail winch (or whatever you are using to control sails)
1 receiver battery harness (a BEC receiver means the receiver can be powered from your main electric motor power supply, but you won't have one of these on a Yacht)

I don't know if that ACOMS Techniplus has a battery harness, and I don't know if the servos it comes with will do what you want them to. One will probably be fine for the rudder...

There are two well-known cheap Chinese 2.4Ghz sets (transmitter+receiver) which are very popular, the Planet T5 - see http://www.modelboatmayhem.co.uk/forum/index.php?topic=25779.0   and the Radiolink T4U - see http://www.modelboatmayhem.co.uk/forum/index.php?topic=27616.0

Of these, the Planet has a better finish, and the Radiolink is by far the cheapest - £25.17p currently from here - http://www.giantcod.co.uk/gianitcod-24ghz-4channel-mode2-transmitter-p-403779.html

If you buy either of these you will need to buy two servos and, I think, a battery harness. Giant Cod is a very cheap supplier with a very wide range - I use their servos a lot and have no problems - you can find them here: http://www.giantcod.co.uk/servo-c-23.html I am sure they will also do battery harnesses. I don't think GC do sail winch servos, which are rather specialised, and quite expensive. I don't know much about them, but I googled to find a cheap one here for around £15 - http://www.servoshop.co.uk/index.php?pid=STEC125BB

But we really need to know the details of what you want to do before providing this kind of advice....

[triumphjon]

liam , how big is your model , a photo is worth a thousand words ! im currently sailing two yachts although im able to use a standard pair of servos in my smaller single sailed model , my 1 meter seawind requires a special servo to haul the sails in/ out ! personally i use 2.4 ghz transmitter & receiver combinations with either futaba or hitec servos .

[Liam]

Ive just posted a pic on the newby section but its 50cm wide and 110 cm high about...

[dodgy geezer]

Ok - here's my proposal for a cheap rig. Having seen your picture I would say that the servos which come with the Acoms set you suggested would be OK for the yacht rudder, but would not be strong enough for the sail. I know not very much about sailing, so this is here for more experienced people to shoot at...


Radio Tx/Rx: 2.4 Ghz Radiolink  - http://www.giantcod.co.uk/gianitcod-24ghz-4channel-mode2-transmitter-p-403779.html -  £25.17p
Rudder servo: Towerpro SG5010 - http://www.giantcod.co.uk/sg5010-towerpro-servo-torque-p-205.htm -                        £3.92p
Receiver battery switch:               http://www.giantcod.co.uk/receiver-switch-plug-p-404415.html                                   £1.29
Sail Winch: SuperTec 125             http://www.servoshop.co.uk/index.php?pid=STEC125BB&area=Servo                           £14.99
Receiver battery holder                http://www.strikalite.co.uk/prodcat_type/9/ALL/0/Battery_Holders.html                        £0.36p  ( or find one hanging around. Solder it to the battery switch lead...)

Batteries (12 AA cells - use alkaline from a cheap shop initially - when you can, buy a charger and 12 aa NiMH cells....


Total £45.73 . Postage and batteries are an extra cost.  If you can get away with a cheaper servo for the sail (say, a Towerpro MG995 from GC) cost would be £37.57....

[triumphjon]

liam , have a look at a wee nip , they are 20 cm wide 69 cms long and 1030 cms high overall , ive built one which im using standard servos to operate both the sails and rudder , my mast is a length of 8mm o/d  aluminium tube from the metal rack in the local b&q ( cost about £ 3.50 ) while the gooseneck have been crarved from a block of soft wood with a 6mm dia dowel to make a boom , the gooseneck will freely rotate on the mast , the sail has a pocket that slides over the mast and is tied to the boom at the front & rear . a free plan is available to download  from marine modelling  ( traplet )

[malcolmfrary]

The pictures in the link
http://www.modelboatmayhem.co.uk/forum/index.php?topic=29775.msg294013#msg294013
dont really answer any questions about the need or otherwise for "turning the mast".  There was a freebie plan in a magazine many years ago featuring a junk where the masts an their sails were rotated.  Since the loads were balanced, the servo did not need to be very powerful, but any boat more than 20" long, assuming an "average" sailplan would need the extra pull from a high torque servo.  A swing rig, being partially balanced, can get away with a less powerful device.  A swing rig has a fixed mast, with the sails fixed to a boom that can rotate about the mast.
An important point to remember when mounting a sail servo is that all of the force applied to the sail is passed through the servo mount.  Having the servo pulled out by its roots in public is embarrassing.  Been there.