GP14 RIG TUNER

Every Donnelly GP14 setting in one live diagram — slide the wind, watch the rig change, read the numbers.
WIND
10 kt

The boat, live MEDIUM

WIND luff sags — genoa powers up main deep, leech closed
rake (tape to transom): 6 880 mm forestay sag: moderate mast bend: slight

SHROUD PINS · CHAINPLATE

1 5 hole 1 = top up = + tension + rake aft down = softer, more upright
hole 3–4
Coarse control: sets rake and base rig tension together.

RIG TENSION · LOOS GAUGE

16 23 30
22–24 (~380–420 lb)
Set with the jib halyard; pins move the baseline. Check both shrouds match.

MAST RAKE

≈ 6 875–6 885 mm
Tape on the main halyard, locked at the masthead, measured to the top of the transom.

MAST-GATE CHOCKS

bow stern
1 thin in front
Fine control: front chocks hold the mast straight for power.

OUTHAUL · MAIN FOOT

15–25 mm gap
Curve between foot and boom. Ease for power, haul tight as wind builds.

KICKER (VANG)

Moderate
Boom just below midline — balanced twist and power. Ease before every gybe.

CUNNINGHAM · LUFF

Just on
Wrinkles just disappearing — smooth entry, steady power.

SPREADERS · BY CREW WEIGHT

A 380 mm · B 150 mm
Balanced baseline. Length = power, deflection = bend. Match sides within 2 mm.

On the water — feel → fix

Heeling early, boat feels heavyMast too straight, leech tight.
→ Remove a front chock
No drive, slow out of tacksMast too bent, sails flat.
→ Add a front chock
Poor pointing, jib luff saggingForestay too soft.
→ Add a front chock or raise pins
Heavy weather helmToo much rake.
→ Raise pins one hole
Boat lifeless, lee helmMast too upright.
→ Lower pins one hole
Still overpowered, chocks already outMain too full.
→ Thin chock behind the mast (prebend)
1 · SETPick today's wind band above and rig to its numbers before launching.
2 · VERIFYTape to transom for rake, Loos gauge on a shroud. Both shrouds within ±10 lb.
3 · ADJUSTOne hole or one chock at a time. Re-check rake after every change, and log what was fast.