Eclater 3d du Giro 34
picture by P.Forgia /F.DIAS(Groupe Finot)
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      Technical Directory   GIRO 34

Sail and rigging

We adopted C.WING rig. This rig uses the current capacities of carbon a great resistance, a high module.

G34 has a rotating mast embedded in the boat held by a stay and 2 shrouds with bottom to aft.
It gives a very simple element with few pieces assembling : stay
and shrouds are fixed on only one attach point in the forward of the mast.

The mast hold a main sail completely lathed and a relatively restricted jib.
The spinnaker is held by a pole rather short for handling. It is located halfway of the stem triangle. That makes the handling less dangerous forward.

This kind of rigging allows a greater sail, a lower sail, with a better form and gives an additional speed 5 to 10 %.

The stability of the boat allows to carry a generous sail, giving
flattering performances at all the positions and all the forces of

plan de voilure G34 (380 ko)
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Hull and deck

vue Giro 34 (396 ko)
image Pierre Forgia (Groupe Finot)
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G34 has a rather traditional hull, moderately broad, with a good stability of form.

The bow is thin on the waterline, enough full in the high parts so that the
boat is well balanced heeling and does not charge in the waves.

The hull is built out of monolithic polyester with UD and multi axial.This
skin is stiffened by longitudinal arms which hold fittings and water ballasts.These longitudinal structures are held by 2 transverse bulkheads
and the 2 big arms which hold the ballast.
The deck is in sandwich glass-foam of PVC.

The cockpit is broad enough to allow to sit out without tiring and operate with 6 people without problem...
Integrated toe rails run from the cockpit to the stem. They allow to sit out without cutting the legs
  • The halyards are in front of the cockpit
  • the jib sheets on the side
  • the mainsheet has a sheet track in the aft and a block in the middle of the cockpit.

vue arriere G34 (585 ko)
picture by Pierre Forgia (Groupe Finot)
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Plan de pont G34 (570ko)
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The sliding hatch is embedded, all is made to give a look very fluid, very latin.


Ballast and water ballast

The ballast is consisted by a full fibre glass fin, injected, embedded in the hull, held by 2 large floors.

A lead bulb is bolted in this fin. The profiles of the fin and the bulb profit from last search which has made on the subject : the stratified fin keel pull down the centre of gravity of the ballast and give an additional speed 2 to 4 %.

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2 water ballasts are placed from the kitchen to the aft of the boat.
They are located rather low not to affect the stability of the boat if she is lying to 90.
During inshore regattas, the boat is used without water ballast.During offshore regattas, specially with a light crew, the water ballast shows all its approval , vitesse, speed, weak heeling angle...This gives more flexibility when you reduce sails.

Water ballast gives additional speed : 5 to 10 %.



axo.gif (4297 octets)

Axonometric and structural view

Structural plan
Plan_StructurePlan_e1.gif (17249 octets)

Stability curve and AVS


stabG34.gif (13236 octets)

AVS = 128,5

This curve and the AVS are provisionel. It'll be necessary to weight the boat and make a real stability test.