Back to Listings


41′ K. Aage Nielsen Design #324 Auxiliary Sailboat

BUTTERFLY: Handsome Keel/Centerboard sloop from the famous Aage Nielsen board.Designed with low proflie trunck cabins so that there would be “nothing to impede visibility forward and allow more efficient line and sail handling” all to serve those intrested in racing.

She has wheel steering, a generous cockpit and lots of accommodation space below.

Her lines are shown in the book “Worthy of thr Sea”on page 184 and her interior layout is on page 185.

A current survey is available to interested parties.

Builder: R. A. Newman and Sons, Ltd., UK
Designer: Aage Nielsen
Keel: Full

LOA: 41 ft 0 in
Beam: 11 ft 6 in
Maximum Draft: 4 ft 8 in

Engine Brand: Volvo
Engine(s) Total Power: 23 HP
Engine Model: MD-11c
Year Built: 1979

Fresh Water Tanks: 3
Fuel Tanks: 1 (32 Gallons)



Wooden Hull Details and Scantlings
Material: Wooden ~ Honduras Mahogany
Construction Method: Carvel Plank on Frame; Double Planked and quilted above the waterline
Topsides Condition and Finish: Very good condition – Finished Fair to the Eye, painted.
House / House Beams: Solid staked timbers / Approx. 1 ½” by 2 ¼” on 10+” centers (measured)
Decks/ Deck Beams: /4 okume marine plywood with with a dynel painted covering. The cockpit is solid teak decking. / 1 ½” x 2 ¼” on 10”+ Centers.
There are tie-rods for the side deck to the Main Hatchcarlin.
Longitudinals: 4” x 1” Doubled to 8” x 1”
Sheer Clamps: 3 ½” x 2”
Stem: Solid timber – Honduras Mahogany
Planks: 8” by 5/8” Doubled to 1 ¼” Centers
Framing: 1 ¾” x 1 ½” on 10-10.5” Centers
Floors: 1 5/8” x 2 3/8” on 10-10” to 10 ¼” Centers
Horn Timber: Approx. Width 5 ½” – Solid Timber
Hull to Deck Joint Type and Fastenings: Full clamp serves as the shelf to deck beans with covering board
Bulkheads / Ceiling: Mahogany, painted and trimmed with Brightwork / Full ceiling above installations with venting above and below. Ceiling width varies slightly.. Butted together 2” by ¼”.
There is ceiling in the aft Cockpit lockers: Ceiling 2” x ¼” on 3 ½” Centers
Fastenings: All Bronze, Copper rivets and roves, double on each plank.
Keel Bolts: Bronze, approximately ½” and 5/8th” Bronze, & 1” Bolts to the Ballast
Sheer Line: “Fair to the Eye”
Hull Protection: Smooth hull per Nielson design
Hull Colors: White Hull topsides and deck.
Cathodic Protection (Bonding): Stranded bare copper wire.
Date of Last Haul Out: Two years ago Date of Last Underbody Paint: Two years

Main Engine(s): Single VOLVO Inboard Model: MD-11c HP: 23 RPM: 2500
Engine Hours: Main or Port: 1773.2 By gauge.
Drive: Direct Age of Engine: 1979 (Replaced an original gas engines)
Gauges: RPM, Temp, Oil Pressure ~ Fuel ~ Other ~Muffler: Water lift type
Fuel Filters: Primary – Racor Secondary – ~Oil Filters: Spin on
Cooling System: Freshwater with heat exchangerAttached Units: 80 AMP Alternator
Exhaust System: Dry exhaust from engine to muffler.
Water injection at muffler with rubber hose to overboard fitting. Dry lines lagged. Dry line with flex exhaust near engine and muffler rubber mounted/isolated from structure.
Engine Room Ventilation: Natural flow
Engine Beds: Solid Timbers
Steering: Wheel to cable to quadrant to rudder-head to rudder Steering Stations: Single
Engine Controls: Single Handle in cockpit to starboard Cruising Speed: ~
Autopilot: Raymarine 4000 Self Steering: None
Rudder Housing: Solid timber with Bronze housing in good order and gland adjustment
Shaft Size(s) and Material(s): Not measured Shaft Gland / Seal: Traditional Bronze Flax packed gland – Double Clamped. Shaft 1.125 diameter stainless steel
Engine Raw Water Cooling Intake Valve: Groco Seacock Raw Water Sea Strainer:
Ship’ Log aboard: Note and records Maintenance Log Aboard : Notes and records
Engine Room/Space Access: Good in general, Pollution Prevention Clean up Kit and Supplies: Oil Absorbent pads


Number / Material / Capacity: One 32 Gallon (US) appears to be Monel
Location / Securement /Labeled (Gas): Beneath the cockpit sole aft of the engine
Age of tanks: Original

Fuel Lines: Material Copper
Fuel Onboard ~ Venting: To hull topsides
Fuel Fill: On Deck in cockpit Fuel Fill Labeled: Yes
Fuel Fill Overflow Runs: Overboard thru Scuppers

Tankage #/ Material / Capacity: Three (3) / Monel / Total 100 gallons
Location: Beneath the cockpit sole aft of engine / Serviceable / Complies
Plumbing Material: Copper and Marine hose
Fresh Water Pump: Hand pumps at both sinks


Bilge Pumps (Type, Capacity, Location, Etc.) The vessel carries One DC bilge pump with float switches, Beneath engine
Manual Bilge Pumps: The vessel has two Manual Whale® Diaphragm Pumps, one in the port cockpit locker and one in the engine space, to port. Both have pump handles stored in place or nearby.

Vessel is rigged as a Sloop Full: X Fractional: ~
Masts and Spar Material: Single Spruce Mast, Aluminum Boom and Aluminum Spin Pole
Spreaders Sets: Double Set
Turnbuckle & Terminal Fittings: Open Bronze and Swaged Terminals
Chain plates lead deep into the bilges (Heavily Built)
Shrouds/Stays: Stainless Steel: Lowers 3/8”, Intermediates 5/16”. Uppers 5/16”, backstay 5/16” (All renewed in 1989, and upgraded)
Mast Stepped: On keel

Materials: Dacron Age: Newer
Mechanical Reefing System(s): Traditional piston hanked headsails
Mechanical Adjustment: ~ Back Stay: Adjustable
Boom Vang: ~
Winches / Winch Handles: Halyards: Barient 22’s, Sheets Lewmar 43, Barient 32 S/T, Barient 26 and 27 / Two Winch handles Observed(1-Barient)
Deck Hardware (Blocks, Cleats, Tracks,etc.): Bronze Spinnaker Blocks (original), Snack Blocks, bronze cleats, Sheet Cars (Bronze), spare blocks and other hardware

Manufacturer(s): «» Age: Main-1976, Cruising Spinnaker
(Schattauer) 2005, Storm Jib (Excellent Condition), Storm Trys’l (Excellent Condition)
Main Sail(s) One

ELECTRICAL SYSTEMS: (33 CFR 183.4, ABYC – E 11, NFPA 302 )
D.C. System: Volts: 12VDC Circuit Protection Devices: Breakers and Fuses
Batteries (Number, Type, etc.): Four DYNO 6 volt golf cart in two 12 volt banks
Location: Engine space to port outboard of the engine
Ventilation: Natural Flow and Blower
Age of Batteries: Marked JULY 2007 Banks: Three (Two banks used for house and engine start. Engine can be hand started as emergency back-up)
Terminal Protection: Boots and box lid
Battery Charging Unit: Professional mariner-ProSport 20
Battery Selector Switch(s): Two Guest and One Cole Hersee Accessory Connectors – (Cigarette Lighter type): Yes


30 AMPS available – not installed
Reverse Polarity Indicator: No Panel
Connectors: ~
Galvanic Isolator: None Observed Galvanic Corrosion Protection System: None
Cords: 1# Est 50’ Cord Adapters: One 30 AMP to 110 (triple plug)
Grounded: Yes


Unless otherwise stated, each item powered up.
VHF Radio(s): ICOM at Nav station and a Uniden Hand Held Battery Operated unit
CB / SSB-Single Side Band Radio(s): ~
GPS Unit / Plotter: Two(2): Garmin 740s (2 years old) plotter gps and radar combined unit and a Furuno GPS/WAAS GP32
Radar Unit: GARMIN with Depth, Plotter & Sonar with dedicated mast of aft deck
Depth Sounder(s): Autohelm Tridata – Depth / Speed / Trip

Compass(s) /Brand(s): Danforth / White Constellation Model in Binnacle at Helm Pedestal Deviation Card aboard
Compass(s) /Brand(s): Hand Held Hand Bearing Compass
Navigation Programs: Garmin Cards 9Local and CN)

Basic Navigational Support: Charts / Tools, Etc: A good inventory of Local Paper charts carefully stored (tubes) and
Parallel Rules, Dividers, etc.

Anchors: One Herresshoff /35# Anchor with folding cross bar and a spare Danforth
RODE: Line and Chain detail 250’ of 5/16” Galvanized chain (Reported, not measured)
Bitter End Secured to Vessel:
Cut-Away Line at Bitter End: Yes, in Chain Locker
Anchor to Rode Connection: Swivel Shackle. The swivel shackle provides the chain to anchor connection- see picture of anchor.
Anchor Windlass / Drive: Single Windlass with both rope and chain gypsy properly positioned for use of chain lead. Manual Windlass.
Anchor Light: Yes
Antenna Masts / Arches: Radar Mast
Stanchions: Solid Bronze, stepped onto Toe railing
Life Lines: Single Lifeline (Coated Stainless Steel)
Railings / and Hand holds (Exterior / Interior): Bow and stern pulpits (Stainless Steel, heavily built) Stern Pulpit has custom stainless steel shelf
Mooring Cleats / Securement: All ORIGINAL. Bronze hardware, cleats and open chock, Sheet tracks, etc
Docklines / Fender(s): There were sufficient numbers and sizes of docklines and fenders for the current conditions; Spare fenders and much spare line, carefully stored and dry

Stovetop / Stove / Oven Shipmate® 3 Burner(Gimbaled) Energy Source: LPG – Propane
Microwave: ~
Refrigerator: Original Icebox (Seals look good)
Number of Toilet Compartments: One enclosed
Toilets: Number and Type One Baby Blake® Marine Head
Shower(s): Sun Showers units (Portable)
Holding Tank Information:
Capacity: NEW approx. 18 Gallons US Material: Polypropylene
Deck Pump Out: Foredeck “Wye” Valve(s): ~ Macerator: Sealand ® TW
Overboard Discharge: Yes


Dickinson “Antartica” (Diesel) & Forced Air (Engine Heat Exchange)
Portable AC Heaters: None Observed
Dehumidifiers: Dehumidifier, floor model, household style, used when Winterized
Propane System Information and Compliance:
Locker Location: Aft deck in Lazarette Tank(s): One Tank Material: Aluminum Condition: Good and serviceable
Tank Fitting (OPD-Overfill Protection Device): Yes Gauge: ~ Gauge in view: Yes, with tank cover removed


Full Winter cover/Summer covers
Pots, Pans, cooking and serving utensils
Set of Bottomsiders ® Cushions
The Cockpit Teak Decks are in good and serviceable
condition; some newer Sekalex in random Seams
Covering boards forward show they have had
some moisture and discoloration over time. Currently sealed with varnish
Custom Storage
Radar Unit
Some dive gear. Dive Gear is personal
One pilot berth amidships and one quarter berth port aft by companion ladder
Sleeps a couple with Privacy; Sleeps 6
Personal Belongings
Binoculars Personal
Custom Drop Leaf table – TEAK
Snatch Blocks, spare Blocks
Tech 2CR1 Tri Cycle Regulator. Provides battery charge and voltage monitoring and control
Brass Ship’s Lamp and Chrome Gimballed ship’s lamp
History of improvements

New replacement heat exchanger copper nickel Sendure
New engine cooling hoses and clamps
New Johnson dual raw water and freshwater pump combination
New Raymarine Tridata, sounder, knot meter, transducer

Wood mast refinish and
new dyneema haulyards replacing wire haulyards
Bottom Paint Micro66
2012 New Garmin 740S, combination chart plotter, sounder, radar, gps, Pole mount on stern for radar

2011: Holding tank 18 gallon, y valve, sealand electric discharge pump

2010 to 2013 LED lights most lights.

2010 New Raymarine Autopilot 4000

12Vdc Skyworthy Marine TV 19” with DVD (not blue ray)
2009 New VariProp 4 blade feathering

Price $75,000
Name Butterfly
Type Sail
Length 41 ft
Hull Material Wood
Designer K. Aage Nielsen
Classification Sloop

Inquire About This Boat