lm24 yacht

Review of lm 24

Basic specs.

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well. The boat is equipped with one cabin, a galley, 90.0 liter fresh water capacity and toilet facility.

The boat equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

The lm 24 is equipped with a long keel. A full keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.

The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.

The boat can enter even shallow marinas as the draft is just about 1.00 - 1.10 meter (3.28 - 3.58 ft) dependent on the load. See immersion rate below.

lm 24 is typically equipped with an inboard Volvo Penta MD 7A diesel engine

The fuel tank has a capacity of 90.0 liters (23 US gallons, 19 imperial gallons).

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 Capsize Screening Formula (CSF)?

The capsize screening value for lm 24 is 1.83, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.0 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 lm 24 is about 100 kg/cm, alternatively 562 lbs/inch. Meaning: if you load 100 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 562 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 Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

What is Displacement Length Ratio?

What is SA/D (Sail Area Displacement ratio)?

What is Relative Speed Performance?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 11m 2 (118 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 modifications, 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 lm 24 it would be a great help.

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• Sailboat Guide

LM 24 is a 23 ′ 7 ″ / 7.2 m monohull sailboat designed by Palle Mortensen and built by LM Glasfiber between 1973 and 1984.

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)

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Considering an LM24 motorsailer

• Thread starter Simonpk
• Start date 9 Jun 2016

Active member

I'm contemplating a small motorsailer and the one that seems to meet the requirements is the LM24, or Cox 22 Master Mariner. I like a bit of sailing but not bothered about bashing to windward any more and these 2 apparently sail quite well off the wind, & I like engines. Are there any owners, past or present, with any info and pointers as to what to look out for? The LM's I've seen have the original BUKH 10 or 20hp 80's engines still in them, are likely to go on for many years or do I need to consider re-engining? Typically there aren't many around so it may have to be the waiting game. Many thanks Si  

Well-known member

My cousin had an LM. Brilliant design, sails better than you might think. You will find most of them still in the Baltic, so check Scandinavian web sites. (Cheaper there too).  

Simonpk said: I'm contemplating a small motorsailer and the one that seems to meet the requirements is the LM24, or Cox 22 Master Mariner. I like a bit of sailing but not bothered about bashing to windward any more and these 2 apparently sail quite well off the wind, & I like engines. Are there any owners, past or present, with any info and pointers as to what to look out for? The LM's I've seen have the original BUKH 10 or 20hp 80's engines still in them, are likely to go on for many years or do I need to consider re-engining? Typically there aren't many around so it may have to be the waiting game. Many thanks Si Click to expand...

RAI said: My cousin had an LM. Brilliant design, sails better than you might think. You will find most of them still in the Baltic, so check Scandinavian web sites. (Cheaper there too). Click to expand...

I don't know whereabouts you are, but I was talking to a chap at Bradwell Marina just a couple of weeks ago. He's very keen to sell his LM24. He's had it for several years, and is now giving up after a long, varied, life of sailing adventures. Let me know if you'd like me to get his contact details.  

• 10 Jun 2016

Thanks Neal, I'm only a little way up the coast from Bradwell in Holland-on-Sea & sail out of Walton. If it's convenient to get his details that would be great. Many thanks  

Simonpk said: Thanks Neal, I'm only a little way up the coast from Bradwell in Holland-on-Sea & sail out of Walton. If it's convenient to get his details that would be great. Many thanks Click to expand...

I have an LM26 with original Bukh DV20. Good, simple, solid piece of engineering. Been on a number of LMs - can't recall any Bukhs being replaced.  

NealB said: Hi Simon. No problem: I'll be going to Bradwell this afternoon. If he's around, I'll get his phone number or email address. If not, I'll leave him a note to contact me. Click to expand...

You might find this link helpful; http://lmowners.proboards.com/ We have an LM30 with a 36hp Bukh, 1985 vintage and still running well. If the engine has been looked after I would not consider changing. Good luck with whatever you buy.  

A heads up from the home of LM. Apart from at start of making furniture (1940) and GRP campervans their main production has been motorsailers from 16' to 32'. Some models more MOTOR and others more SAILER. Some actually sold without mast. Nowadays the factory makes wind mill wings of impressive diemensions. Production to my knowledge is moved out from Denmark. If interested the selection of LM's over here is quite large. Local version of gumtree has 38 for sale, 24' asking from some £6.000 http://www.dba.dk/baade/baade/motorsejlere/?soeg=lm&sort=price https://www.google.dk/search?q=lm+m...6p3NAhUGDZoKHRjxD-QQ_AUICCgB&biw=1696&bih=794 PM if you need assistance with language, contact info etc.  

Simon, I have sent you a pm with details about the LM 24 at Bradwell.  

• 11 Jun 2016

Simonpk said: I would certainly entertain a Colvic Watson 23, but unfortunately the wheel house on that one looks like greenhouse stuck on top. Si Click to expand...

chinita said: I have an LM26 with original Bukh DV20. Good, simple, solid piece of engineering. Been on a number of LMs - can't recall any Bukhs being replaced. Click to expand...

Len Ingalls

Love my Mascot 28. Similar to LM but "square stern"-more space. https://www.youtube.com/watch?v=qqeQWh_Q1RI Clever layout. Low pilothouse,because pilothouse deck is lower than cockpit. Sails well. https://www.dropbox.com/s/3f0f6mhn2waecmt/Puffin II Layout.jpg?dl=0  

• 13 Jun 2016

Good news on the longevity of Bukh engines & I don't want to go any larger that 23/24ft.  

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Share Thread Facebook Twitter Tumblr LinkedIn MySpace Email Go to Previous Thread Next Thread Junior Member Select Post Deselect Post Link to Post Member Give Gift Back to Top Administrator Select Post Deselect Post Link to Post Member Give Gift Back to Top LM24s and 27s aren't as close winded as more sporty craft, but the consensus seems to be they will sail at about 50 degrees to the apparent wind.  They do sail much better than people expect from their chunky shape, and in comparison to most other 'motor-sailers'.   2) I would expect that, like the LM27, they do steer in reverse, though certainly not as easily as a fin-keeled boat. (But better than a long-keeled boat with the traditional rudder on the back of the keel and a prop cut-out.)  It can be challenging in a tight marina, especially at first, but you do get more used to it with practice.  You need to have regard to which way your prop-wash will push the boat, and how the wind will affect it. 3) The Bukh DV engines (10, 20, 24, 36 etc.) are very solid, simple, well-engineered engines that are reliable if properly maintained. (My Bukh is 40 years old and performs well.) They have been in continuous production for over 40 years, and are still made today (except the DV10).  These days they are mainly fitted to lifeboats (they are too heavy and expensive to be a popular choice for today's boatbuilders). Almost all parts are readily available, but they tend to be expensive. Although the DV10 is no longer built, it shares most parts with the DV20 (the DV20 is a two cylinder version of the single cylinder DV10). I can't authoritatively advise on hp, but I would expect that 10hp would be perfectly adequate, and 20hp would be more than enough. 4) I would standing headroom with your head ducked a bit. Hope that helps until someone else can give you more detailed and authoritative info. Junior Member Select Post Deselect Post Link to Post Member Give Gift Back to Top Senior Member Loving our 'new' boat.... via mobile Select Post Deselect Post Link to Post Member Give Gift Back to Top New Member Select Post Deselect Post Link to Post Member Give Gift Back to Top Junior Member via mobile Select Post Deselect Post Link to Post Member Give Gift Back to Top Quick Reply 1982 LM 24 Motor Sailer Technical Specs General data about lm 24 motor sailer. Brand Model Boat Type Category Year Of Production Condition (New/Used) Country Fuel (Gas/Diesel) Hull Material Used Length Selling Price Vat Status Dimensions And Wieght LOA (Length Overall) Boat Maximum Draft Boat Keel Type Beam Width Detailed Specifications Numebr of Cabins Number of Heads (Watercraft) Gas Tank Size Berth (Twin/Double) Berth (Mono/Single) Features And Equipments Sailing features. Stainless steel standing rigging 2006 Spinnaker Rotostay furling headsail system Roller mainsail reefing Masthead sloop rig Mainsail Alloy mast and spars by selden Safety Features Lifebuoy Other Equipments Windscreen wiper Two extending forepeak berths Two anchors Stainless steel sink Stainless steel keel band new 2019 Saloon table Large underberth locker storage Hull epoxied from new Grp hull, deck and superstructure Galley with 2 burner cooker with grill Furling genoa Fenders Encapsulated keel with bilge plates Clock/barometer Interior Specifications Hanging locker Exterior Features Radar reflector Engine And Mechanical Specs Bilge pump Electronical And Electrical Info Compass steering LM 24 Motor Sailer LM provided us with the latest version of its 24 Motor Sailer service repair manual Find All mechanical and electrical parts and accessories of LM 24 Motor Sailer Sail here LM 24 Motor Sailer competitors Motorsailer Frank Magazine Denison History Virtual Tours --> --> -->