Rod Johnstone

j105 1

j105 3

j105 2

Fiberglass

<p>Monohull boats are vessels with just one hull, as the name itself suggests. They can be monohull <a href="https://theboatdb.com/boats/type/sail">sailboats</a> or <a href="https://theboatdb.com/boats/type/power">powerboats</a>, which means they can be powered by an engine or by the wind. In addition, monohull boats can have a high level of luxury on board and can therefore be referred to as monohull yachts. At TheBoatDB you can look into monohull boats and explore their features. In addition, you can filter your search through monohull sailboat manufacturers and explore all models available on our site. Compare all models on our website from the comfort of your home.</p>

Monohull

j105-1_1579791815

Factory

Solent

J Boats

Euro

Asymmetric spinnaker

<p>The category of sailboats includes both <a href="https://theboatdb.com/boats/category/daysailer">sailing yachts</a> which are luxurious and charming vessels used for recreational purposes, as well as <a href="https://theboatdb.com/boats/category/cruiserracer">racing sailboats</a> that are used for sports. Some have a single hull while others can have two or three. Compare different types of sailboats through sailing boat specs on TheBoatDB and find out the best one for you. Choose according to boat specs, and explore sailboats that vary from very large vessels, appropriate for ocean cruising, to small ones used to roam the shores.</p>

Name	Value
Maker	J Boats
Maker website	https://www.jboats.com
Model	J/105 Shoal draft
First built hull	1991
Version	Shoal draft
Boat type	Sail
Category	Racer Boats
Hull type	Monohull
Hull material	Monohull

Name	Value
Top speed	11.72 kmh
Mast height	15.36 m
Length overall	10.52 m
Length at waterline	9.02 m
Beam overall	3.35 m
Draft maximum	1.74 m
Displacement	3,514.88 kg
Ballast weight	1,549.92 kg
Ballast type	Lead
Helm	1 wheel
Rudder	1 spade rudder
Cockpit	Closed aft cockpit

Name	Value
Naval architect
Name/Studio	Rod Johnstone
Website	http://www.jboats.com/

Name	Value
Mast	50.4
Spars	Mast and boom in Aluminum
Standing rigging	Single-strand (ROD)
Number of spreaders	2
Spreaders angle	Swept-back
Upwind sail area	53.61 sq.m
Downwind sail area	121.24 sq.m
Mainsail A	304.00
Mainsail B	273.00
Spinnaker A	1001.00

Name	Value
Engine A
Power	20 HP
Type	Inboard engine ; Diesel
Engine B

1991 J Boats J/105 Shoal draft

Boat Overview

Type

Maker

Hull type

Hull Material

Fiberglass

Category

Boat length (LOA)

10.52 m

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Overview

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Specs

Performance & Ratios

Name	Value
Sail Area to Displacement (SA/D)	0.06
Upwind SA to Displacement	23.58
Downwind SA to Displacement	53.34
Hull Displacement Speed	0.06
Displacement to Length (D/L)	7.29
Ballast to Displacement (B/D)	0.44
Capsize Screening Formula (CSF)	2.23