Seller's Description
1983 J Boats J29 Speed- Speed through the water is the most obvious factor in performance. Sailing speed improves daily cruising range, generates excitement and pride in ones vessel, and makes one less dependent upon a motor.
One way to get more speed from a sailboat is to reduce weight of furnishings and equipment. Another way is to concentrate weight in the center of the boat. Both of these objectives have been achieved in the J/29 without sacrificing basic below-decks liveability.
The J/29 provides a comfortable midship “living room” with ice chest and sink for dockside gatherings or overnight cruising for two … but nothing in the forward or aft third where each pound of weight adds to the “moment of inertia” to amplify pitching in waves.
The result is a smoother ride than on boats with heavier ends, hence less resistance and more speed.
More on the website jboats.com/j29/j29
Simon Duplantie simon@ohanasailing.ca 1 514 949-9061
Equipment: Electronics Depthsounder Raymarine Log-Speedometer Raymarine Compas ✓ VHF ✓ Inside Equipment Electric Bilge Pump ✓ Manual Bilge Pump ✓ Outside Equipment Swimming Ladder ✓ Rigging Spinnaker Pole ✓ Sails 3 x Fully Battened Mainsail Mainsail Pentex (2001), Mainsail 3DL (2013), Mainsail Dacron 2 x Spinnaker Full Spinnaker Gear, (2) Spinnakers. 3 x Genoa 1 North 3DL150% Genoa (2012), 2 Dacron 100% And Approx. 130% Genoa Engine Make Yamaha Engine Model 9.9 Engine Year 2018 Engine Type Outboard Fuel Type Gas Dimensions Length Overall 29.5ft Max Bridge Clearance 47.5ft Max Draft 5.67ft Beam 11ft Length at Waterline 25ft Tanks Fresh Water Tank 1 X () Fuel Tank Holding Tank Accommodations Double Berths 1 Heads 1
Specs
- Designers
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- Builders
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- Associations
- ?
- # Built
- ?
- Hull
- Monohull
- Keel
- ?
- Rudder
- ?
- Construction
- ?
Dimensions
- Length Overall
- 29′ 5″ / 9 m
- Waterline Length
- ?
- Beam
- 10′ 11″ / 3.4 m
- Draft
- 5′ 8″ / 1.7 m
- Displacement
- ?
- Ballast
- ?
Rig and Sails
- Type
- ?
- Reported Sail Area
- ?
- Total Sail Area
- ?
Mainsail
- Sail Area
- ?
- P
- ?
- E
- ?
- Air Draft
- ?
Foresail
- Sail Area
- ?
- I
- ?
- J
- ?
- Forestay Length
- ?
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 1
Calculations
- Hull Speed
- ?
Hull Speed
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.
Formula
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
- Sail Area/Displacement
- ?
Sail Area / Displacement Ratio
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.
Formula
SA/D = SA ÷ (D ÷ 64)2/3
- SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D: Displacement in pounds.
- Ballast/Displacement
- ?
Ballast / Displacement Ratio
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.
Formula
Ballast / Displacement * 100
- Displacement/Length
- ?
Displacement / Length Ratio
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.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
- ?
Comfort Ratio
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.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
- ?
Capsize Screening Formula
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.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
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