J World:  The Performance Sailing School & Sailing Club   

San Francisco Bay |  Puerto Vallarta, Mexico   |   1-800-910-1101     

Express 27 Tuning Guides and Tips - J World San Francisco Bay, The Performance Sailing School and Club
 

North Sails Mumm 30 Tuning Guide

 

Base Settings:

Headstay Pin to Pin Measurement:

12140mm

Rake: Swing Arc - Use Centerline halyard pulled down to top of black band - pull forward to mark headstay.

Mark on headstay down to headstay pin:

1820mm

Cap Shroud Tension:

#35 on RT 10 Rod Loos Gauge

D1 Tension:

#10 on PT2 Wire Loos Gauge

D2 Tension:

#7 on PT2 Wire Loos Gauge

J Dimension:

3315mm

Mast Base - (Distance from forward headstay bolt to front of mast):

3480 mm

Pre-Bend:

75mm


 

Sail Models:

Mainsail

Light Jib

Med Jib

Heavy Jib

Masthead
30g

Masthead 40g

Fractional
40g

Masthead
A-Sail 30g

JBM-03

RMLJ-03

MJ-03

HJ-03

MHL-03

MHH-03

FS-03

MHA-03

 

Quick Adjustments (full turns from base settings)

True Wind Speed:

Sail Selection:

Headstay:

Cap Shrouds:

D1s:

D2s:

Really light (0-5k)

LJ-02/MHL-02/MHA-02

-10

-2

-2

Base

Light (5-9k)

LJ-02/MHL-02

-7

-1

-1

Base

Medium (10-15k)

MJ-02/MHL-02

Base

Base

Base

Base

Heavy (16-20k)

MJ-02/MHH-02

+7

+1

+2

Base

Really Heavy (21k+)

HJ-02/MHH-02

+15

+2

+3

+2

 

 


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