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
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.
Above specifications based on data courtesy of Robert Hess
Email from S&S about a polar diagram for the Hughes 38:
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Jon, Thank you for your interest in the Hughes 38 – S&S Design 1903. Unfortunately, there is not currently a polar diagram available for this design. Should you desire to have one created, we could undertake this project, but there would be substantial costs involved as this design does not currently exist in the digital world that we work in today. Please let me know if we can be of further assistance. Best Regards, Jason |
Hughes 38 -1
Hughes 38 -2
Hughes Northstar 38
Hughes 38 – 3
Sail and Rigging Plan
Sail Plan Dimentions and Turnbuckle List
Sail Plan Notes
Revisions (by Olin Stephens?)
Specifications for Northstar 38 (?)
Deck Plan and Rudder Detail for H38-1
How to heave to in a Hughes 38:
1. Double reef the main, or raise a storm trysail.
2. Put the boat hard on the wind.
3. Roll up the (roller furling) jib or strike the jib totally.
4. She should now be 45 degrees off the wind.
5. You have four possible adjustments to improve the heave to: Main sheet, traveler, topping lift and rudder. Play with them to achieve to minimize hunting and forward speed,
6. Use the topping lift to take stress off the leach of the sail and the sailtrack.
HUGHES 38 HULL AND RIGGING LAYOUT PLAN VIEW
HUGHES 38 DECK AND BELOW DECK LAYOUT