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>> Home > Boat Building Blogs > Emerald - "Round the Word" ocean racing yacht.
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mdlbt.com/44355
Emerald - "Round the Word" ocean racing yacht. Print Booklet
Author: East-RN   Posts: 1   Photos: 22   Subscribers: 1   Views: 138   Responses: 5   |   Most recent posts shown first   (Show oldest first)

mdlbt.com/44356
Emerald - "Round the Word" ocean racing yacht. - Posted: 29th Jul 2018
Purchased new in kit form, from Robbe. 1998.
Specifications:-
Overall length: 1380mm.
Overall beam: 360 mm.
Draught: 300 mm.
Mast height: 1800 mm.
Overall height: 2200 mm.
Standard sail area: 80 square dm.
Sail area with Genoa: 94 square dm.
Total displacement: 12 kg.
Ballast: 8 kg.
Scale: 1:10
Control
Robbe Futaba F14 Marine transmitter / receiver.
Channel 1 - Rudder servo.
Channel 2 - Spare.
Channel 3 - Genoa sail servo.
Genoa switch module - fitted between the stick potentiometer
and the transmitter channel 3 Socket.
(Reverses the Genoa sail servo for Port or
Starboard tack.)
Channel 4 - Main sail servo.
Channel 5 - Auxiliary 3 position switch - up position.
Channel 6 - Auxiliary 3 position switch - down position.

Receiver channel 5 - Mono Memory relay module. To drive the
Blister motor out, to raise the Genoa Sail Clew.
Receiver channel 6 - Mono Memory relay module. To drive the
Blister motor in, to tighten the Genoa Sail Clew.

Recently recovered from the back of the shed, where it has been in hibernation. Now I am retired and have some free time, it is under a review and refurbishment. New paint on the deck and upper hull (above the waterline). Solid state relay modules added, to replace the micro switches, operated from a cam on a servo (replacing analogue channel 2 with on/off channels 5 and 6).
Pictures show the sea trials after the 10 year hibination.
The Genoa Module had failed in the carbon potentiometers. No replacement available, so found a local electronics repairers, who changed the potentiometers for £10.00.
The carrying cradle was designed to hold the sails, and secure the yacht while rigging at the waters edge. Also acts as a dry dock, while working inside the hull.
When the repaired module is fitted, and the Genoa sail is operational, I will post detailed video of the Genoa sail winch and Blister motor and their operation while sailing.
Genoa Sail Pictures added.

Attached Photos - Click To View Large

Response by NPJ on the 31st Jul 2018
Now that is really neat.

Will be putting that on the list of 'upgrades' for definite.

NPJ.
Response by East-RN on the 31st Jul 2018
Main Sheet Modification:
Yachts of this nature, would be fitted with a Traveller, which would be used to help shape the Main Sail. Also, the route of the main sheet, has a lot of twists and turns to get out of the cabin and up to the Boom. Plus, it has to pass through the tube and bend at its edge.
The starting point of the control would be from the cockpit, especially if it is a Single Handed yacht. The ideal place for the traveller, would be on the roof of the cabin. To keep physical disruption to a minimum, I decided to use the original boom running gear pulleys.
The termination of the MainSheet would now be at the traveller on the cabin.
1. The cleat was removed from the cockpit, and the eye bolt was replaced by an S hook, screwed to the cockpit deck( see picture 1).
2. A hole was drilled in the cockpit, adjacent to the cabin hatch, and in a direct line with the main Sheet control system. This will allow the main Sheet to pass directly from the cleat. Through the pulley assembly (withought going round the pulley), and straight aft to the cockpit.
3. A brass tube was glued into the hole, flush with the cockpit surface and extending inside, towards the mainsheet control system (see pictures 1 and 2).
4. The Traveller was formed from a length of brass rod, (approx 300mm long), formed to the same curve as the cabin roof. Slide the pulley onto the rod so that it runs freely. Make a 90 degree bend at each end, the length of the traveller apart. These 2 legs will pass down into the cabin roof, leaving about 10 mm for the pulley to run from end to end. Plus about 10mm at each end of the rod, which will be bent up against the inside of the roof and glued.
(see picture 3 & 4).
5. Mark the cabin roof where the traveller is to be mounted. I chose to mount the traveller directly under the boom pulley.
I have made a revised sketch which is taken from the original plans for guidance. See picture 5.

Note: make sure the pulley is mounted on the rod between the two bends.

6. Drill the holes in the cabin, pass the ends of the rod through the holes. I put a 10mm piece of wood under the traveller rod, next to the hole. This allows you to hold it securely, while you bend the rod out, on the inside of the cabin. Apply plent of glue or resin to secure it. Do the same at the other end of the rod, and leave to set.

With the cockpit removed, and the mainsheet control system in place, take the free end of the main sheet and pass it through the new hole in the cockpit. The cockpit can be secured by the 4 locking pulleys.
Now pass the mainsheet through the S hook and up to the boom. Adjust the S hook to suitable angle.
When the yacht is rigged, the mainsheet is passed up to the end of the boom pulley, along the boom, over the pulley and down to the traveller pulley.
With the tx/ex active, pull the mainsheet right in, and the trim set right out (this allows for final tightening).Secure the mainsheet to the eye of the pulley, ( I use a figure of 8 knot ). Now adjust the trim on the joystick to pull the main Sail tight.
Finally, run the servo right out, and back in a few times, to make sure it works properly.
Move the boat round so the wind cones from a different angle, and watch the traveller as the sail is pulled in and out.
Now you are ready to sail.
May your wake be long and straight.
Ray 😎
Response by NPJ on the 2nd Aug 2018
This is great stuff and really looking forward to implimenting some of this in my refurb.

When I get to it I will need my hand holding as although I have read it twice, that does not mean I understand it all!

Cheers.

NPJ