Seller's Description
Electra is one of 12 wooden planked Yawls designed by Bill Luders. It was designed for use as the United States Naval Academys sail training craft. Electra was built somewhere between the years 1947-1950 at the United States Navy Yard in Yakaska, Japan. Construction is of wood with an overall length of 47, powered with a Diesel engine. The boat has a unique design to the interior with the now antique brass fixtures and attractive woodworking design of the interior.
Specs
- Designer
- Alfred E. Luders
- Builder
- Luders Marine Construction
- Associations
- ?
- # Built
- 12
- Hull
- Monohull
- Keel
- Long
- Rudder
- ?
- Construction
- Wood
Dimensions
- Length Overall
- 43′ 11″ / 13.4 m
- Waterline Length
- 154′ 2″ / 47 m
- Beam
- 10′ 7″ / 3.2 m
- Draft
- 6′ 0″ / 1.8 m
- Displacement
- 23,400 lb / 10,614 kg
- Ballast
- ?
Rig and Sails
- Type
- Yawl
- Reported Sail Area
- 980′² / 91 m²
- Total Sail Area
- 852′² / 79.1 m²
Mainsail
- Sail Area
- 419′² / 38.9 m²
- P
- 46′ 5″ / 14.2 m
- E
- 18′ 0″ / 5.5 m
- Air Draft
- ?
Foresail
- Sail Area
- 433′² / 40.2 m²
- I
- 52′ 5″ / 16 m
- J
- 16′ 6″ / 5 m
- Forestay Length
- 55′ 0″ / 16.8 m
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 1
Calculations
- Hull Speed
-
7.1 kn
Classic: 7.34 kn
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
-
19.2
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
-
387.4
300-400: heavy
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
-
45.3
40-50: heavy bluewater boat
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
-
1.5
<2.0: better suited for ocean passages
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
Notes
Built for the US Naval Academy by Luders Marine Construction. (AKA NAVAL ACADEMY YAWL/NA 44) Originally of wood planked construction (1939). Replaced with a fiberglass version (by Uniflite) in 1963 with a slightly different hull/rig design and different interior layout. (4 went to the US Coast Guard)
A few of the FG version were sold to individuals as sloops/cutters. (See ANNAPOLIS 44). Naval Academy boats were passed on to the US Coast Guard Academy for a few years before being sold off to individuals.
(Replaced in 1985 with the NAVY 44/DEFIANCE CLASS by McGurdy & Rhodes and again, in 2000, with a Dave Pedrick designed 44 footer.)
The layout shown here is for the original wood version.
Thanks to Mainbrace 76, and several others for providing additional background information.
Specs above are for the original wood version
See LUDERS 44 (FG) for specs on the Fiberglass (1963) version.
This listing is presented by SailboatListings.com. Visit their website for more information or to contact the seller.
