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6 – The Nacra F16 Carbon is only Class legal for races in double crew configuration. 4 – The Nacra F16 Carbon is available in single and double crew configuration.
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Crew 2 sailors
† – The Nacra F18 Infusion is available with an Retrofit compatible FCS Package .
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NACRA F18 Evolution
The NACRA F18 Evolution is a racing Catamaran built with advanced technology, sophisticated design tools and 45 years of experience. The main purpose of the new Formula 18 design was to build upon the unique pedigree of the NACRA F18 Infusion as the best all-round performing F18, across the full range of sailing conditions for every sailor. The most distinctive feature of this Evolution F18 is its hull shape design – an aggressively styled raked wave-piercing bow with a horizontal hull chine that runs back into the transom. This design offers a unique compromise for both sailing upwind and downwind at different speeds. Moreover, the optimized foredeck in front of the main beam and embedded beams into the hull add elegance to this design. The updated longitudinal beam position optimizes the hydrodynamic and aerodynamic balance between the sail plan and appendages.
Technical data NACRA F18 Evolution
Gallery NACRA F18 Evolution
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- Sailboat Guide
1980 NACRA 18 square meter
- Description
Seller's Description
Incredible Upgraded customized 1980 NACRA 18 square meter catamaran TRRE0089M80J and Custom “hydraulic special designed tilting trailer” wherein the boat is automatically centered over the trailer while up and down in flat position all done by hydraulic lift ram and swing arm. I was a Sol Cat, Prindle then NACRA dealer in the Seattle, WA area for Decades, this is my own 18 square catamaran. The boat is in perfect shape no scratches or scuff on the hulls. Combined this 18 Square and trailer may be without a doubt the best in the country. Boat has always been stored inside a climate-controlled building and I have not used the boat for the last 20 years. Sailing an 18 Square meter is a delight and once you learn the boat and the sail settings the boat really flies. This boat has won numerous regattas. For further information more pictures, or discussions please sent e-mail to [email protected] and include your contact information. I took off the trampoline and had it re-stitched as the threads appeared to need some attention in a few areas. It comes with Two Mainsails and two booms and a host of custom features and modifications, and spot painted areas of the trailer with Gloss White Por-15. Just added front Trailer solid Oak walking platform. The Boat is 11’ Beam, non-foam sandwich stringer hulls, 18 feet long, weighs approximately 350 lbs. Specs include 30’3” mast, that has been modified for internal halyards and yet is sealed so no water gets in the mast. All fittings have been streamlined and buffed and reinstalled with counter sunk flush rivets on mast. Custom mast head lighter, more streamlined and single lever adjustable diamonds for up wind flatter sail and down-wind fuller sail adjustment. Bottom hull seam removed, filled and custom urethane bottom paint buffed to mirror finish. Slightly shrunk and raised rear of hulls with transoms up 1 ½” to reduce hull drag and faster tacking. Curved Rear traveler around rear maim beam so traveler flows in and out without binding or wear. Like new 316 stainless rigging, adjustable custom anodized aluminum trapeze handles (I invented them) and system, dagger boards and trunks are Nacra 5.8 so boat points higher, has lower center of gravity. 7:1 mainsheet with tapered mainsheet line, 6:1 downhaul. There are two booms, 5/1 internal outhaul on both of the booms, one stock in vertical profile and one custom converted with rear internal stiffener in the horizontal geometry, which is much stronger for out-halting out to the side of hull and main sheeting in for downwind sailing, like an ice boat. The dolphin striker and foot casting were streamlined and re-anodized and mast base was upgraded to the new Nacra style with a locking ball for safer mast stepping, but used the original smaller ball and casting so lighter. Two mainsails by Skip Elliot Dacron. Both are in excellent shape. Tapered foam sandwich battens top to bottom both main sails. Has super long extendable tiller and titanium cross adjustable tiller bar, so stronger and lighter as well. When I purchased the boat the first thing was raise and reshape the rear of the hulls up 1 ½ inch at the stern which reduced drag and improved tacking. I fully rebuilt the mast streamlining and polishing all the fittings and used countersunk aircraft Monel rivets. Customized mast head and installed custom internal lightweight internal plastic tube for the halyard into internal base outhaul box so all sealed so mast doesn’t take on water if boat turned over with the internal halyard with hook and ring system at the top. Custom spreaders fiberglass foils over the spreader tube (over stock straight through tube). The mast has a quick-change spreader lever that converts the mast to stiff (for fuller sail for downwind) to looser spreaders (for flatter Up Wind sailing), all done with a single lever mounted on the front lower part of the mast that you can change in seconds. Plus, it’s all adjustable for fine tuning. The trailer is a one on a kind and clearly in my opinion, possibly the best tilt cat trailer ever built. The trailer frame is wide wheel base EZ Loader 18/20-foot Power boat frame for 1500 lb. plus power boats, and uses a full-size axle/wheels and is very strong with low center of gravity. You can actually stand on the fenders. It’s probably four times as strong as most catamaran trailers. The tilting, swing arm and boat frame carriage part I designed, built out and welded the box steel frame that holds the boat ridged with no flexing. That structure tilts up with a hydraulic Ram and a swing arm structure attached to the tilt frame. Boat is cradled with custom fiberglass cradles made specific to the hull shapes. It’s extremely stable for trailering on the highway even in strong cross winds that have plagued other cat tilt trailers. I built three of these trailers and it took a year to design and build the first one. This trailer was the last and best incorporating features not done on the others two. Tilt height to top of upper hull is 13,3 inches slightly under semi-Truck trailers height (commercial semi rigs to a height of 13 feet, 6 inches). So, no need to disassemble the boat just slide onto the trailer and strap down on the cradle anchor points.
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)
Also called NACRA 18M2. Designed for maximum length, beam (11’) and SA allowed by the single handed 18 Sq. Meter ‘box’ rule which had been recently established at the time. (NACRA’s version was introduced first using the standard hulls of the NACRA 5.2. Later (1983?, updated with a new, full length, hull design.(18’) Another NACRA 5.5 (non-18SM) was available with the same hulls, less beam and a sloop rig. The NACRA 5.5 (18sm) shown here has the boom (gooseneck) attached to forward beam. This was replaced in the mid 1980’s with a newer NACRA 18sm with the updated 5.5m hulls and boomless rig.
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- Nacra Sailors Forum
By spike , January 27, 2016 in Nacra Sailors Forum
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Dropped my 30 year old 18 sq off at Brisbane Catamaran for a must needed refurb.
Look what I got back!
Link to comment
Share on other sites, coremeister 2.
Now that would have to be the "Coolest" thing on the Lake, where do you sign up for a go on that.
I guess you have the spinnaker kit on order.
I just searched Nacra 18sq on google, and this beauty filled the screen!
I have a very old 18sq that needs a lot of work, and this is the inspiration that I was looking for (Sail no 128)
I'm also based in QLD, in Bowen that is at the top of the Whitsundays - our off the beach sailing club is looking fairly lively this season so I'd better think about getting started with a refurb.
What sort of condition was the boat in when you sent it to the Brisbane shop?, and how reasonable was the price of the work carried out?
great to hear there is another one out there.
My 18sq was sailable but in very sad condition. The work done on the boat was a new square top (reused the old battens in it to save some bucks), new boom and 10:1 main. new front beam and dolphin striker. removal of the knee breaking aluminium tubes between the fore and aft beams. New Cross cut trap (which allows you to take the tubes out as it stiffens the boat). New deeper rudders (infusion style) and acumen tiller system (reused castings- but required the gudgeons to be relocated). The mast is basically original we just upgraded the halliard to the standard Nacra ring and hook arrangement.
my hulls are not too bad did a bit of work on them to fix some leaks etc. (still have one around the port centerboard case) re-gelcoated the bottom seam and gave it a sand and buff. Probably needs s few more hours of work on the hulls - might do this next off season.
The new rig and rudders has transformed the boat, I am still struggling a little to get a handle on the square top but the boat with some tweaking is getting faster every outing -seems to finish in the middle of the 5.8 fleet in races ( slightly faster upwind the 5.8 and a bit slower downwind, but think there is still some potential in the rig I haven't tapped into yet). At 11 foot wide it seems to makes the A class boys a bit nervous when you come up behind them.
Price wise it owes me about the same as a race ready second hand 16 sq.- which I recon is great value as it is a hoot to sail.
get yours going and bring it to the nationals a lake cootharabah and we will dust of the national trophy!
Geez Craig its going to be hard to step of that back onto the 4.5. Although it is a strange way to keep racing against James or is James getting the new 5.8 and your going to be chasing him with the menace with crew and the 18 without.
The 18 Sq is just a lake boat at the moment - will be coming to bundy for your regatta with the 5.8 and 4.5 on top. - (bit hard to double decker the 18 sq. )
- 7 months later...
madboutcats
G'day Spike you got me interested enough to purchase an 18 square with square top, can you tell me have you righted the boat on your own
haven't gone there yet, the boat did have brackets for a righting bar but I haven't reinstalled it. Think you would have no chance of righting it without one.
having said that being 11 foot wide you get a lot of opportunity to redress a bad situation before it gets worse!
did you buy the sydney boat on gumtree?
Thanks for the reply, I'm putting a righting bar on this one, yep it's the gum tree one, I thought it would be pretty rough but it turned out it was Bob Forbes one that used to have the wingsail, but now has a carbon T mast and square top sail, it's in good nick for the age, I just have to put the fittings back on the mast, can you tell me what tension you are running on your diamonds and what mast rake you are using
- 3 weeks later...
sorry about the late reply haven't had the boat out for a few weeks. The mast on my 18 is the original pear aluminium one (same as on 5.8) I am running about 35mm of spreader rake to take some of the belly out of the middle of the sail. diamond wires are tight - mast is pre bent. With regard to mast rake I was running around front hatch cover (lake sailing) this clearly isn't back enough as I cartwheeled it on the weekend - its a long way up /down from the back corner!
- 4 years later...
John at kelso
Hello all, Does anyone have an 18sq they can live without, I am currently sailing a 16sq but would love to change up. Any leads will be greatly appreciated.
cheers. John Dunn
- 1 month later...
Very hard to find. I am keeping mine as it is a brilliant ride . Think there is around 20 out there
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1980 NACRA 18 Square Meter Catamaran Sailboat for sale in Lynden, WA
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Remarks Incredible Upgraded customized 1980 NACRA 18 square meter catamaran TRRE0089M80J and Custom “hydraulic special designed tilting trailer” wherein the boat is automatically centered over the trailer while up and down in flat position all done by hydraulic lift ram and swing arm. I was a Sol Cat, Prindle then NACRA dealer in the Seattle, WA area for Decades, this is my own 18 square catamaran. The boat is in perfect shape no scratches or scuff on the hulls. Combined this 18 Square and trailer may be without a doubt the best in the country. Boat has always been stored inside a climate-controlled building and I have not used the boat for the last 20+ years. Sailing an 18 Square meter is a delight and once you learn the boat and the sail settings the boat really flies. This boat has won numerous regattas. For further information more pictures, or discussions please sent e-mail to [email protected] and include your contact information. I took off the trampoline and had it re-stitched as the threads appeared to need some attention in a few areas. It comes with Two Mainsails and two booms and a host of custom features and modifications, and spot painted areas of the trailer with Gloss White Por-15. Just added front Trailer solid Oak walking platform. The Boat is 11’ Beam, non-foam sandwich stringer hulls, 18 feet long, weighs approximately 350 lbs. Specs include 30’3” mast, that has been modified for internal halyards and yet is sealed so no water gets in the mast. All fittings have been streamlined and buffed and reinstalled with counter sunk flush rivets on mast. Custom mast head lighter, more streamlined and single lever adjustable diamonds for up wind flatter sail and down-wind fuller sail adjustment. Bottom hull seam removed, filled and custom urethane bottom paint buffed to mirror finish. Slightly shrunk and raised rear of hulls with transoms up 1 ½” to reduce hull drag and faster tacking. Curved Rear traveler around rear maim beam so traveler flows in and out without binding or wear. Like new 316 stainless rigging, adjustable custom anodized aluminum trapeze handles (I invented them) and system, dagger boards and trunks are Nacra 5.8 so boat points higher, has lower center of gravity. 7:1 mainsheet with tapered mainsheet line, 6:1 downhaul. There are two booms, 5/1 internal outhaul on both of the booms, one stock in vertical profile and one custom converted with rear internal stiffener in the horizontal geometry, which is much stronger for out-halting out to the side of hull and main sheeting in for downwind sailing, like an ice boat. The dolphin striker and foot casting were streamlined and re-anodized and mast base was upgraded to the new Nacra style with a locking ball for safer mast stepping, but used the original smaller ball and casting so lighter. Two mainsails by Skip Elliot Dacron. Both are in excellent shape. Tapered foam sandwich battens top to bottom both main sails. Has super long extendable tiller and titanium cross adjustable tiller bar, so stronger and lighter as well. When I purchased the boat the first thing was raise and reshape the rear of the hulls up 1 ½ inch at the stern which reduced drag and improved tacking. I fully rebuilt the mast streamlining and polishing all the fittings and used countersunk aircraft Monel rivets. Customized mast head and installed custom internal lightweight internal plastic tube for the halyard into internal base outhaul box so all sealed so mast doesn’t take on water if boat turned over with the internal halyard with hook and ring system at the top. Custom spreaders fiberglass foils over the spreader tube (over stock straight through tube). The mast has a quick-change spreader lever that converts the mast to stiff (for fuller sail for downwind) to looser spreaders (for flatter Up Wind sailing), all done with a single lever mounted on the front lower part of the mast that you can change in seconds. Plus, it’s all adjustable for fine tuning. The trailer is a one on a kind and clearly in my opinion, possibly the best tilt cat trailer ever built. The trailer frame is wide wheel base EZ Loader 18/20-foot Power boat frame for 1500 lb. plus power boats, and uses a full-size axle/wheels and is very strong with low center of gravity. You can actually stand on the fenders. It’s probably four times as strong as most catamaran trailers. The tilting, swing arm and boat frame carriage part I designed, built out and welded the box steel frame that holds the boat ridged with no flexing. That structure tilts up with a hydraulic Ram and a swing arm structure attached to the tilt frame. Boat is cradled with custom fiberglass cradles made specific to the hull shapes. It’s extremely stable for trailering on the highway even in strong cross winds that have plagued other cat tilt trailers. I built three of these trailers and it took a year to design and build the first one. This trailer was the last and best incorporating features not done on the others two. Tilt height to top of upper hull is 13,3 inches slightly under semi-Truck trailers height (commercial semi rigs to a height of 13 feet, 6 inches). So, no need to disassemble the boat just slide onto the trailer and strap down on the cradle anchor points.
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