The owner bought this boat in 2020
General condition and any additional information
1983 Montgomery 15 #265; “Osprey”.
Garage-stored in Tucson AZ.
$6,900 firm, very good condition.
Stout EZ Loader trailer with Buddy bearings, lights, rollers and spare tire. Recently towed 800 miles without incident.
Newer cushions dry cleaned and foam replaced. Have not been slept upon.
New, never used Thetford porta-potty.
New LORAN fish finder / depth sounder installed but not used.
Completed six steps of rubbing compound, polish and wax.
Aluminum sail control platform mounted behind the mast above the hatch organizes all lines.
Solar panel trickle charges the battery.
Mainsail, working jib, heavy jib, storm jib, genoa and spinnaker.
Foresail down haul rigged.
Whisker pole and paddle.
Additional Genoa tracks, blocks and cars mounted on combings.
Two anchors (Bruce 7.5 kg and HK 7.0 kg), chain and rode.
Solar vent on bow.
Electric panel with battery.
Reliable, clean Honda 2 horsepower, 4 stroke, long shaft outboard that runs great.
Kick-up rudder with tiller extension.
Bug screen insert for hatch boards.
Additional clear Plexiglass hatch boards.
Stainless Bimini with cover that is older.
AM / FM radio whip antenna (dismounted).
Rare Montgomery 15
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 √LWLA 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)
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