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Crowther 42

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crowther 42 catamaran

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Crowther 42

Crowther 42 is a 41 ′ 11 ″ / 12.8 m catamaran sailboat designed by Lock Crowther and built by Cat Factory (USA) starting in 2000.

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)

Crowther Design #226

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Sail catamarans 40ft > 50ft,          crowther boats for sale, crowther 42 boats for sale, crowther 42  .

crowther 42 catamaran

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crowther 42 catamaran

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Crowther design 226A (42 foot cruising cat)

Discussion in ' Multihulls ' started by DennisRB , Jan 25, 2014 .

DennisRB

DennisRB Senior Member

Does anyone know much about this design? Not much is coming up in internet searches.  

Attached Files:

Out of water.jpg, with bimini2.jpg.

waikikin

waikikin Senior Member

Dennis Looks like a No95 with some later styling & removal of bulbs, some where I have a catalogue from around 2000..... the hard part would be finding it. Extreme? multis that was based at Woolamia did at least one similar maybe about 1993. Jeff.  
Its hard to find anything that is for sure. This is all I can find on Lock Crowther designs. http://www.offshorecats.com/lockcrowther.html  

outside the box

outside the box Previous Member

DennisRB said: ↑ Does anyone know much about this design? Not much is coming up in internet searches. Click to expand...

Richard Woods

Richard Woods Woods Designs

outside the box said: ↑ I am reluctant to take it offshore as it hobbyhorses extremely badly when in a seaway * Click to expand...

Twiggyman

Twiggyman Junior Member

Crowther Design portfolio - 226 Here is a scan of design 226 from Crowther's Design Portfolio circa 1990 ~ Design 226 is pictured beside Design 106, which is a Catana 40'. It appears that Design 226 was a development, or similar, to the Catana. My favorite catamaran design.  

Crowther design 226.jpg

Re hobbyhorsing: The builder owner said it was a great seaboat. Note, he is not the one selling it. Twiggy. Thanks this is a 226A, not sure what the A means but it is 43 foot, but that could have just been added length. Also it reputably weighs 6.5-7.0 ton rather than the 5.2 mentioned in your study plan. But who knows with what gear on board that was measured. This boat seems to have much more space on it than a early Crowther catana, and has as much space as a C431 I gues since its your favorite, it must be a decent boat! Feel free to ramble on about everything you know about it.  
outside the box said: ↑ Is it the pre-cursor to the below mentioned design as part reposted from the bullfrog verbatium discussion on anarchy? Doesn't Bloomfield design hold rights to some or all the Crowther designs? Perhaps they could help you out in findinG more information just For what it is worth the repost is below. * I built a Brett Crowther designed SP40 Cat and launched it in 2001, its a great cat with lots of volume and good speed for a 40ft cruising cat but even though the design was sold as a "blue water" cruiser I am reluctant to take it offshore as it hobbyhorses extremely badly when in a seaway and even though it has 35000NM under her belly I don't want to sail her to New Cal or Fiji but id sail Bullfrog to these places and live with the smaller livieaboard space which I don't need anyway. * Click to expand...
Bit of an update. https://www.youtube.com/watch?v=npEdopvh7OI Sorry Richard, no hobby horsing in any conditions I have been in so far. But it does have a tendency to go bow down with weight.  

Ozjon

Ozjon New Member

I wasn't aware of this website until today (A cat sailing friend gave me a "heads-up" and told me about Crowther #226 comments) - so I've just joined! I built a #226 about 10 years ago in Airex-epoxy sandwich. I still own it, but I'm now too old to sail it much more. I've sailed about 8000 miles in it - Bass Strait, up and down the East coast Aus, up to the Philippines and back and cruising the Philippines. A great comfortable boat which sails well and handles sea conditions well. An excellent sea-going boat! It has NEVER hobby-horsed! The bow design is brilliant! Crowther got that right! The bow cuts through waves very well without losing much way, thanks to the fine bow at the waterline, but the wide flare (only in the top 25%) prevents the bow from burying in big waves. That is particularly important if you are surfing down big waves! I've never had green water over the bow (even in 40kt winds, gusting to 55kts with 4m seas). My #226 has 4 full-sized double berths, a head in each hull, and a big galley in the main cabin. The designer's estimate of 5.5 tons cruising weight was a bit optimistic! - more like 6 or more tons (but I double skinned the hulls below the waterline for added ruggedness). On my MEL- Philippines trip, I carried a lot of cargo (boat building material, glass, epoxy, paint, fittings, heaps of tools, etc., plus about 3/4ton of fuel and water) and weighed about 6.5-7 tons. On that trip, we readily made 150 miles per day and occasionally 200 miles - just taking things easy, (with heavy-weight cruising sails, cruising, not racing, and with amateur, back-packer crew). If you want to know more about a Crowther #226 - just ask. Cheers, Ozjon  

Corley

Corley epoxy coated

Hi Ozjon and welcome good to see another Melbournite on here  
Here are a couple of photos of my boat (beached for a water-line cleaning) at Mindanao, Philippines. The wooden gang-plank was a temporary item, only carried while cruising the Philippines. Enjoy!  

P1000654.JPG

P1000649.jpg.

Awesome boat. Thanks for sharing. I have been living aboard ours and love the boat. It seems quick enough. Cruising speeds are good. We can easily average over 8k as long as there is ok wind. I haven't done that many long trips but have averaged over 10k for a few hours and hit the teens often. Max I have done is 17.2, but the builder said he had it up to 24K. Today saw an average of just under 8k and max of 11k sailing for 2 hours back from Tangalooma the Scarborough under just the jib in 20-25k. The main is at the sailmaker. Last time we averaged about 9-10k on that same trip. The 226A version has the engines in the back rather that in the middle of the hulls and the bridgedeck is longer with double beds forward of the cabin which makes it heavier than the 226. This engine location means saildrives which I am not a fan of. There is a longer thread with more details here. http://forums.sailinganarchy.com/index.php?showtopic=155740&hl=  

oldsailor7

oldsailor7 Senior Member

Has anyone got any info on what Stuart Bloomfield is doing now?.  
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Boat Design Net

    Beam:  25'6'    Draft:  3'10'
    Beam:  25'    Draft:  3.6'
    Beam:  24'    Draft:  3'
    Beam:  20'    Draft:  3'6'
    Beam:  13'6"'    Draft:  2'

crowther 42 catamaran

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