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Designed by Gary Mull and Jim Donovan, only 6 Humboldt 30’s were built. Planing hull; Remarkably responsive tiller; transom mounted rudder; PHRF NW 108 (standard rating 102) Large, comfortable cockpit and wide side decks. Easy access to bow. The custom cabin top provides ample headroom in the nav station /stove area where its needed most. Although I’ve happily cruised for up to 2 weeks at a time, this boat was built to sail and the belowdecks accommodations and equipment for cruising are basic (see photos). Large V-berth plus 4 additional berths. Lots of storage space throughout. Port-a-Potty, stove, freshwater bladder, ice chest Excellent condition for it’s age. Great choice for day-sailing, racing. Sailing characteristics are outstanding. Last bottom job 2 coats 2018. Once per season bottom cleaning by diver has enabled 5 yr. cycle between haul outs. New Dimension Polyant (Flex Poly Cruise) main as of 2015 by Taylor Sails, Port Angeles. 2 reef points makes the large main very adaptable to existing conditions. 110 jib on furler; quick and easy tacking. 2 spinnakers 2003 Yamaha 9.9 well-maintained and just keeps on running Raymarine tiller pilot 22 lb. Claw Anchor, 180 5/8nylon rode plus 8 3/8 chain.
Comments by Jim Donovan: The Humboldt 30 was one of my projects while working at Gary Mulls office. I drew the lines, sorted out the rig, rudder, keel, deck layout, interior, etc. It’s a fairly roomy performance 30-footer - light displacement (not ultra-light) - very large rig for light air performance. They only built a few - really a victim of the economics of yacht building in the US. Higher labor costs in the US made it very difficult for US builders to compete. The hull molds were beautifully built by the same guys who worked on many of the production tooling for Santa Cruz builders.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Also called HUMBOLT BAY 30.
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