j 145 sailboat

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J/145 is a 48 ′ 1 ″ / 14.7 m monohull sailboat designed by Rod Johnstone and built by J Boats between 2002 and 2006.

Rig and Sails

Auxilary power, accomodations, calculations.

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 √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

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.

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 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.

Ballast / Displacement * 100

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.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

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.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

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.

CSV = Beam ÷ ³√(D / 64)

Shallow draft: 7.5’.

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The key to this combination is a low VCG made possible by a cast nickel-aluminum-bronze keel fin with a lead bulb on the bottom. The ballast-to-displacement ratio is 44 percent, and a draft of 8 feet, 11 inches results in a VCG 2 percent below the DWL. The 145 uses this VCG to get a limit of positive stability of 135 degrees. In the last two years we have seen limits of positive stability for racing boats far in excess of what is considered adequate for cruising boats. Everyone likes stability. It translates directly to sail carrying power.

The hull form of the 145 features a midsection with a surprising amount of deadrise. The hull is relatively narrow with the max beam carried forward in an effort to make the boat more benign when pushed hard off the wind. This is not a shape you would see on a current IMS type of hull with an ultrafine entry. Deadrise fairs out to a flattish run aft. The rudder is huge. You can choose a shoal-draft keel option with 7-foot draft. The D/L of this design is 110.

This is a very interesting interior layout. Note the V-berth/double pushed forward, leaving a large sail stowage area directly forward of the mast. Aft of this, the layout is conventional with a pilot berth to port, outboard of the opposing settee berths. The galley is big, but I would have turned the icebox 90 degrees to allow the range to come forward, providing counter space each side. It's a personal taste thing, but I do a lot of cooking and I know galleys. I surprised last week's crew with my super three-cheese lasagna. Nitpicking aside, this is a great layout. Numerous options are available if you want to "plush up" the interior.

This is a big rig. The SA/D is 29. The spreaders are minimally swept, and runners and checkstays will be needed to keep the standard Hall Spars carbon stick in column. The mainsail is raised on a 2:1 halyard. The bowsprit is retractable. The sailplan shows overlapping genoas, but for cruising, a 95-percent blade jib would be enough to allow you to blow away almost any other cruising boat.

I have been a long-time fan of J Boat's decks. They seem to suit my own sailing style to a T, and the 145 is no exception. The cockpit is long and has seats long enough to stretch out on. The coamings are low and that could be a problem for lounging, but they will make getting in and out of the cockpit easy. I like a low coaming at the wheel, but I like at least 12-inch coamings forward.

The 145 is built in TPI's patented Scrimp method with unidirectional carbon and E-glass skins over Baltek's Superlight 45 core. The engine is a 56-horsepower Yanmar 4JH3CE with a saildrive unit. There is tankage for 90 gallons of water in two tanks and 75 gallons of fuel.

Designer Rod Johnstone has given us a J Boat cruiser that in focus is not far from my own Icon design. As Bill Lee once said: "Fast is fun."

Also in Perry on Design

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Also from Robert H. Perry

Review of J/145

Basic specs..

The J/145 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The boat can only enter major marinas as the draft is about 2.71 - 2.81 meter (8.89 - 9.19 ft) dependent on the load. See immersion rate below.

The boat is typically equipped with an inboard Yanmar 4JH3-CE diesel engine at 56.0 hp (41 kW).

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 8.7 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for J/145 is about 343 kg/cm, alternatively 1924 lbs/inch. Meaning: if you load 343 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1924 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 65m 2 (699 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section is reserved boat owner's changes, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

We are always looking for new photos. If you can contribute with photos for J/145 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

The J145 is a 48.1ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 2002 and 2006.

18 units have been built..

The J145 is a light sailboat which is a very high performer. It is very stable / stiff and has a good righting capability if capsized. It is best suited as a fast cruiser.

J145 for sale elsewhere on the web:

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Some results uranium dioxide powder structure investigation

• Processes of Obtaining and Properties of Powders
• Published: 28 June 2009
• Volume 50 , pages 281–285, ( 2009 )

Cite this article

• E. I. Andreev 1 ,
• K. V. Glavin 2 ,
• A. V. Ivanov 3 ,
• V. V. Malovik 3 ,
• V. V. Martynov 3 &
• V. S. Panov 2  

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7 Citations

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Features of the macrostructure and microstructure of uranium dioxide powders are considered. Assumptions are made on the mechanisms of the behavior of powders of various natures during pelletizing. Experimental data that reflect the effect of these powders on the quality of fuel pellets, which is evaluated by modern procedures, are presented. To investigate the structure of the powders, modern methods of electron microscopy, helium pycnometry, etc., are used. The presented results indicate the disadvantages of wet methods for obtaining the starting UO 2 powders by the ammonium diuranate (ADU) flow sheet because strong agglomerates and conglomerates, which complicate the process of pelletizing, are formed. The main directions of investigation that can lead to understanding the regularities of formation of the structure of starting UO 2 powders, which will allow one to control the process of their fabrication and stabilize the properties of powders and pellets, are emphasized.

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Investigation of the Properties of Uranium-Molybdenum Pellet Fuel for VVER

Investigation of the Influence of the Energy of Thermal Plasma on the Morphology and Phase Composition of Aluminosilicate Microspheres

Evaluation of the possibility of fabricating uranium-molybdenum fuel for vver by powder metallurgy methods.

Patlazhan, S.A., Poristost’ i mikrostruktura sluchainykh upakovok tverdykh sharov raznykh razmerov (Porosity and Microstructure of Chaotic Packings of Solid Spheres of Different Sizes), Chernogolovka: IKhF RAN, 1993.

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Andreev, E.I., Bocharov, A.S., Ivanov, A.V., et al., Izv. Vyssh. Uchebn. Zaved., Tsvetn. Metall. , 2003, no. 1, p. 48.

Assmann, H., Dörr, W., and Peehs, M., “Control of HO 2 Microstructure by Oxidative Sintering,” J. Nucl. Mater. , 1986, vol. 140,issue 1, pp. 1–6.

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Authors and affiliations.

Elektrostal’ Polytechnical Institute (Branch), Moscow Institute of Steel and Alloys, ul. Pervomaiskaya 7, Elektrostal’, Moscow oblast, 144000, Russia

E. I. Andreev

Moscow Institute of Steel and Alloys (State Technical University), Leninskii pr. 4, Moscow, 119049, Russia

K. V. Glavin & V. S. Panov

JSC “Mashinostroitelny Zavod”, ul. K. Marksa 12, Elektrostal’, Moscow oblast, 144001, Russia

A. V. Ivanov, V. V. Malovik & V. V. Martynov

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Correspondence to K. V. Glavin .

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Original Russian Text © E.I. Andreev, K.V. Glavin, A.V. Ivanov, V.V. Malovik, V.V. Martynov, V.S. Panov, 2009, published in Izvestiya VUZ. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya, 2008, No. 4, pp. 19–24.

About this article

Andreev, E.I., Glavin, K.V., Ivanov, A.V. et al. Some results uranium dioxide powder structure investigation. Russ. J. Non-ferrous Metals 50 , 281–285 (2009). https://doi.org/10.3103/S1067821209030183

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Published : 28 June 2009

Issue Date : June 2009

DOI : https://doi.org/10.3103/S1067821209030183

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• nuclear fuel
• uranium dioxide
• uranium protoxide-oxide
• crystallite
• agglomerate
• conglomerate
• surface morphology
• ADU-ammonium diuranate
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