Specifications – Hughes 38 – Northstar 38 – Hughes-Columbia 38

Hughes 38 -1

Hughes 38-1

 

Hughes 38 -2

Hughes 38-2

 

Hughes Northstar 38

Hughes Northstar 38

 

Hughes 38 – 3

Hughes 38-3

 

 

 

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Sail and Rigging Plan

 

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Sail Plan Dimentions and Turnbuckle List

 

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Sail Plan Notes

 

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Revisions  (by Olin Stephens?)

 

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Specifications for Northstar 38 (?)

 

Hughes 38 Deck_Plan

Deck Plan and Rudder Detail for H38-1

Some Hughes 38 Numbers:

IMS Certificate Limit Positive Stability: 118.2º       (minimum race standards – Whitbread: 125º, Hobart: 115º, PIYA: 105º)  IMS Stability Index: 124.6
Angle of vanishing stability (angle at which boat will roll over): 118.3º
PHRF Rating: 141 – 180  (difference possibly spinnaker vs non spinnaker)          
IOR Handicap Rating: 28.7 – 30.2
Calculated hull speed under power: 6.9 Kn (1.34×27^1/2) Calculated hull speed under sail: 7.9 Kn (1.34×35^1/2)

SA/D ratio: 15.8 (optimum 16 – 18, > 20 racing)
D/L ratio: 328 (optimum 100 – 400, >100 self-righting / < 200 racing)
Ted Brewer Comfort Factor ratio: 34 (optimum 30 – 40, < 30 racing)  
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam↑1.33), where displacement is expressed in pounds, and length is expressed in feet.
Capsize risk ratio: 1.61 (optimum <1.8, > 2 extreme racing)
Velocity ratio: 1.06 (optimum 1.06, >1.14 racing)
LOA/Beam ratio: 3.72 (< 3 very beamy)
Roll acceleration: .014 G (> .06 poor offshore cruiser)
Roll period: 4.75 seconds (<4 stiff, >8 tender)
LWL/Beam WL ratio: 3.25 (optimum 3.4, <3 very beamy)
Ballast/Displacement ratio: .44 (optimum .4, >.5 very stiff)
Fineness coefficient: .67 (optimum .65 – .68, < .65 hull finer than normal at waterline)
Lb per in immersion: 804 lbs (weight required to sink boat 1”, PPI increases as hull sinks)
Moment to trim 1”: 954 lbs (force required to trim boat fore and aft 1”)
Calculated Cruising Speed/length ratio: 1.21 (optimum .9 – 1.3, > 1.4 racing)
Sail area/Wetted surface area ratio: 2.34 (optimum 2.2 – 2.4, > 2.5 good in light air)  
Calculated engine power for offshore (displacement hull auxiliary):   31 hp

Above specifications based on data courtesy of Robert Hess

Notes      1.  A ballast of 6400 lbs is used because of the engine (400lbs) over the keel (6000lbs), and below the waterline.

2.  I used 14,500 lbs displacement as this is probably the weight in cruising trim.