sailboat zuma

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• Sailboat Guide

AMF AlcortVanguard Sailboats Zuma

• Description

Seller's Description

Zuma sailboat made by AMF Alcort/Vanguard in the 80s and 90s. Excellent little sailing dinghy. Simple to rig and sail, room for 2 (friendly) adults and light enough to car top. Responsive, points pretty well and will plane out on a reach. Fun and great to learn on.

LOA: 12’9” Beam: 5’0” Sail Area: 65 square feet Weight: 130 lbs

Also has a built in compass! Sail is in excellent shape, lines and rigging are solid, ready to sail.

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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Zuma rigging diagram

• Thread starter DDecker
• Start date Jul 24, 2012
• Brand-Specific Forums

Hi! Does anyone know where we can get a rigging diagram for our 1987 Zuma 12' sailboat? Any help would be greatly appreciated....  

Look at the pictures in this site..... the sail has a sleeve that slides over the mast.... a downhaul holds the sail in position. http://sailingtexas.com/szumae.html  

Thanks Victory! Your photos were very helpful. We look forward to sailing our Zuma on Lake Winnipesaukee in New Hampshire next week...  

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Bobby's Boat Works

Holder 14 Centerboard Spring

Force 5 Tiller

Laser Tiller

Holder 12 Rudder Assembly

Holder / Vagabond 14 Daggerboard

Holder 14 Kick Up Rudder Assembly With Tiller

Sunfish Daggerboard - New Style - Mahogany

Sunfish Rudder - New Style - Mahogany

Sunfish Tiller

Starfish Rudder

Custom Made Parts

Due to a high demand of stock items and a large backlog, we are not taking any custom orders at this time. We are still making Holder and Vagabond components on an as needed basis. 

Custom Projects

I got into this business because I love boating and boat building. Making these custom parts is a real joy for me and I insist that everything going out the door is of the highest quality.  This takes a little time as all of the details are worked out, but the finished product and happy boaters makes it all worthwhile.

Use this form to contact us and begin the process of getting your part made for your boat!

La Grange, Texas 78945

[email protected]

(979) 250-1668

Thanks for submitting!

Mike Lynch’s Sunken Superyacht Is Largely Intact, Italian Officials Say

I talian investigators searching the wreckage of the Bayesian superyacht said it appeared largely intact, a discovery that contradicts earlier eyewitnesses who said its mast had snapped when it sank in Monday’s storm.

Divers are reporting that the 180-foot-long yacht was lying on its side on the ocean floor, an Italian coast guard official said Wednesday. “The divers are looking for structural damage on the hull,” the official said.

The early reports from Italian officials appeared to be at odds with witnesses who had said the aluminum mast snapped during a violent thunderstorm when the vessel sank off the coast of Sicily with 22 people on board, including owner Mike Lynch, a U.K. tech billionaire.

The towering mast on the Bayesian stretched nearly 240 feet into the sky—making the superyacht the tallest luxury sailboat when it was built.

Maritime experts said a broken mast of that height could cause serious damage to a vessel, but the design isn’t a safety concern as long as the masts are well maintained and held tightly upright on the hull by cables called stays.

“Bigger masts support bigger sails and higher sailing speeds,” said Takis Tsakos, a veteran captain who also oversees for clients the construction of superyachts such as the Bayesian at yards in Europe and the U.S. “The yacht fans love the bigger masts because they look marvelous and give the vessel more volume. They are especially impressive at night when they are lit up.”

The Bayesian’s mast could have fallen on the hull, damaging it, or could have been uprooted from its base by the strong winds if the stays weren’t tight enough. Yacht captains say loose stays can make a boat tilt as much as 15 degrees even with the sails folded.

“That would have made a gaping hole and water could have rushed in. It was also a relaxed evening—doors and windows could have been open with more water coming in as the boat tilted,” said Tsakos, founder of Athens-based Yachtways GP, which rents out luxury yachts in the Mediterranean. “These will be determined when the yacht is pulled out of the water.”

The people missing and presumed dead in the sinking of the Bayesian include Lynch, his daughter, a top executive at Morgan Stanley and one of Lynch’s lawyers. The group was celebrating Lynch’s acquittal on U.S. fraud charges.

Italian authorities are continuing to investigate the accident and divers are trying to access the sunken hull. Rescue teams located five bodies from the wreck on Wednesday. The body of the boat’s chef was retrieved from the sea on Tuesday.

Masts must meet the safety standards of classification societies that give the green light for a ship to sail and monitor its maintenance over the years. Oversize masts on superyachts are turned by computer so they face the wind straight on and not sideways even when the sails are folded.

“For a vessel of this size to go down, there must have been tremendous ingress of water inside its enclosed spaces,” said Fotis Pagoulatos, a naval architect who has participated in a number of shipwreck investigations. “Its design allows it to stay afloat, even with two compartments flooded.” He said he wouldn’t be surprised if the yacht’s hull is found cracked and buckled from the forces exerted by the freak weather and possibly the cracked mast.

The single-masted Bayesian was built by Italian company Perini Navi and delivered in 2008 to its original owner. The boat, which was taller than it was long, was one of a class of supersize luxury yachts that cruise the Mediterranean and other hot spots.

Formerly known as Salute, it was one of several that Perini Navi built that was 56 meters long. But its sister ships had shorter masts—generally extending 59 meters, compared with about 72 meters for the Bayesian. Perini Navi didn’t return requests for comment.

The Bayesian has been eclipsed by newer boats owned by other billionaires. Jeff Bezos, the Amazon.com founder, commissioned the 127-meter-tall Koru, a three-masted vessel that was delivered in 2023.

The Koru was so tall that in 2022 it sparked a protest over plans to dismantle a bridge to let it sail out of the Dutch port where it was built. Instead, the ship was towed to another shipyard to have its masts mounted.

Still, the Bayesian remained one of the largest private sailing yachts. It was ordered by a Dutch businessman but, in 2005, he was paralyzed in a yachting accident and it was sold on completion to another Dutch owner and renamed Salute, according to yacht brokers.

In 2014, it was sold to an entity owned by Angela Bacares, Lynch’s wife, and renamed Bayesian. It has no racing history, but boats of this size compete in events such as the St Barths Bucket Regatta, an annual race in the Caribbean, and in the Perini Navi Cup, a four-day race near Sardinia.

Perini Navi is known for creating some of the world’s most famous and luxurious sailing yachts, including the 88-meter-long Maltese Falcon, one of the world’s most recognizable sailing yachts, with rotating masts and a futuristic design.

The masts of the Maltese Falcon are 57 meters tall.

Write to Costas Paris at [email protected]