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Mercury Class Yacht Racing Association

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MERCURY ONE DESIGN - REGATTAS, RESULTS AND CLASS INFO - UPDATED 9/6/23

Welcome to the 2023 mercury class web site.

For over 78 years the Mercury Class Yacht Racing Association (MCYRA) has been racing throughout California. For 2023 the class continues to thrive and grow with great racing throughout all of California. We have expanded the class archive section with some great historical docs and images with more to be added. And as always use the site learn about our history of competitive racing on the water and and family oriented activities off the water. 

In 2023 we continue to attract top sailors in the best California racing venues but we don't forget to have fun. With regattas hosted in the San Francisco bay area, Carmel, Monterey, Huntington Lake in the Sierras, Santa Barbara, Los Angeles and San Diego great competition is close by and always a challenge! Our active regatta schedule has events occurring every month of the year.  Mercury sailboats are easy to store, trailer and launch. And you can get started on a budget with competitive used boats starting around $1000.

For a closer look at a boat or a test sail as a crew contact a fleet representative or email [email protected]  for more information.

2024 Regatta Schedule Now Available!

Schedule  Updated January 25, 2024

Read more: 2024 Regatta Schedule Now Available!

2023 Norcal Series NOR Available

The 2023 Norcal Series at Encinal Yacht Club begin on March 4th.  The Carmiggelt Trophy race will be held on April 1st, 2023. The final two days of the series will be held on May 6th and June 3rd.

Please find the attached NOR, SI's, and Entry form which may be brought to the first day of sailing.

Read more: 2023 Norcal Series NOR Available

2023 Regatta Schedule Now Available!

Schedule  Updated January 26, 2023

Read more: 2023 Regatta Schedule Now Available!

2024 NorCal series opener

2024 scya midwinter regatta.

Ten Mercury’s were entered for the 94 th Midwinters Regatta at Cabrillo Beach YC.

With four of the entries traveling south from the SF Fleet.  In the usual form the fleet was competitive, mixing it up with crowded mark roundings, and close finishes.

Saturday’s conditions saw the wind ranging from 220-240 degrees as the day progressed, and wind speed up to 12 + mph.  Ben Bradley won race 1 from start to finish. Race 2 and 4 were won by Mike Burch, and race 3 by David Bacci.   Mike Burch was leading after day 1 with consistently strong finishes.

Read more: 2024 SCYA Midwinter Regatta

2023-24 RYC Small Boat Midwinter Regatta

Race 1 - Dec. 3, 2023

No report, but here are results from Richmond YC December Small Boat Midwinter Regatta with one race scored

569 Chris Lanzafame                 1

429 Dave West                           2

481 Dave Bacci                          3

558 Kurt Lahr                             4

541 Scott Jenson                       5

463 Shaum Sinawi                    6 /DNS

2023-24 Perry Cup

Perry cup 4th race & final results, february 3, 2024.

John and Mike Ravizza won this season’s Perry Cup Series with a first and two second-place finishes against three other Mercs on an overcast day with a light but remarkably steady northerly breeze on Monterey Bay. Patti and Jack McAleer needed to shift the weather mark only once when the wind shifted to the right and diminished to a whisper, as the boats ghosted to the finish on a three-lap windward-leeward course that PRO Dick Clark wisely shortened after two laps.

Second place went to Bradley Schoch and Patrick O’Hara of the local fleet. They accomplished the rare feat of earning 1st in the Silver Division in addition to their overall podium finish.

Ravizza’s and Schoch’s boats were the only two to start all twelve races in the series. Third place in the series went to Dave West and Chris Krueger, who missed the first weekend’s races. Randy Smith was absent from January’s four-race installment but still finished the series in 4th place with two wins on the last day.

Read more: 2023-24 Perry Cup

Don't Forget Your 2024 Membership Dues!

The are due now!

Just click on the image to download the membership form!

From The Prez...

2023 is fast approaching. Your executive committee has been working on the 2023 schedule with an effort to encourage you to sail in more events this year. 

Attached is a preliminary schedule for your review.   Notice we have reduced the number of Travel Trophy events to five in the hope more of you can fit this in your schedule.

Read more: From The Prez...

Mercury-Sail Is Looking For A New Webmaster...

After 25 years it's time for a new webmaster to step up and continue supporting the class.

Read more: Mercury-Sail Is Looking For A New Webmaster...

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Copyright MCYRA 1998-2023

Boat Specialists' showrooms, service and parts department, are open Monday-Friday, 9:00-5:00

Boat Specialists will be closed 5/27-5/29 in observance of Memorial Day. All online orders will begin processing on Tuesday, 5/30

Mercury 5hp Sail Power Outboard | 5MLHA

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• Description Mercury's all-new 5hp four stroke Sail Power outboard provides the ultimate in reliability, portability and convenience for those looking fora small but mighty outboard to effortlessly push their sailboat through the water. The Sail Power model features an alternator combined with additional thrust making it ideal for moving heavy loads at a slower yet more controllable pace. These motors also pair well with aluminum tiller, inflatable and utility boats.

Motor Specifications

• Engine Type: Mercury 5MLHA Sail Power Inline 1 Four Stroke
• Horsepower: 5hp
• Cylinders: 1 cyl
• Shaft Length: 20'' Long
• Throttle Control: Tiller
• Starting: Manual
• Weight: 59 lbs
• Alternator: 4 amp / 50 watt
• Full Throttle Range: 4500 - 5500 rpm
• Displacement: 123cc
• Fuel System: Carbureted
• Induction System: 2-valve pushrod (overhead valve)
• Warranty: Mercury Marine 3-Year Warranty

Standard Features

• Propeller: 6.0" Pitch High Thrust 3-Blade Aluminum
• Internal Fuel Tank (0.3 gallons)
• Integrated Carry Handle
• Servie Tool Kit & Parts
• Stop Switch Lanyard
• Owner's Manual

Mercury Marine FourStroke Outboards

Offered in a variety of horsepower options, the Mercury Marine...

Additional Prep/DMV Info

Dealer Engine Prep is required to validate the warranty and ensure a working engine. Prep includes completing a full Original Equipment Manufacturer (OEM) checklist, test-run performed in a tank for quality assurance, and re-crating for shipment. Outboards picked up in-store may be stand-alone and no longer in the box or crate.

Pre-Delivery Inspection

Pre-delivery Inspection is required to validate the warranty and includes the necessary services & products used on each new vessel to ensure quality performance prior to delivery.

For rigged vessels: Boat Specialists will install a deep cycle marine battery, rig all steering components, and complete an electrical and systems check. A full system check includes filling the motor with oil, fluids, and fuel, then a test run performed in a tank for quality assurance.

Once everything is tuned and prepared, a sea trial is performed to achieve the ideal RPM-to-top-speed ratio, ensuring the boat gets on plane properly and all systems operate on water. Afterward, full detail is performed on the exterior, deck, and hull to be turn-key ready for the customer.

DMV Registration On Boats and Trailers - For California Residents Only

Boat Specialists will take care of your CA DMV registration including signing a Power of Attorney for each registration. We will mail temporary paperwork with the documents that require the customer's signature. The customer is to sign and return the documents in the envelope provided. Once we have received the paperwork, we will submit all required documents to the DMV to complete registration.

By moving forward with this purchase, you expressly agree to the terms and conditions as explained on the TERMS OF SALE page.

ALL OUTBOARDS AND RIGID INFLATABLE BOATS (RIBS) ARE SHIPPED WITH A DELIVERY SIGNATURE REQUIREMENT AND MUST BE SHIPPED TO A PHYSICAL STREET ADDRESS. The customer must inspect the packaging before accepting the delivery. If there appears to be any damage to the unit, the customer must refuse the delivery and take pictures of the damaged packaging and damaged units, including any broken pieces. If the packaging is damaged, but the product appears unharmed, the customer must have the delivery driver note the type and location of the damage on the Delivery Receipt and take pictures of the damaged packaging. If the parcel is left without a signature and damage is found, please contact Customer Service immediately at (805) 644-6290. Do not discard the box or any packaging materials.

INFLATABLE BOATS, OUTBOARDS*, TRAILERS, AND ELECTRONICS CAN NOT BE RETURNED For all other products, returns for refunds must be made within 10 days, minus shipping and handling fees. Returns for store credit or exchange must be made within 30 days. Special orders are ineligible for returns. We only replace items if they are defective or damaged and notified within 10 days. A refund will be processed once the product is received from the customer. Customers must notify return within 10 days and provide a tracking number to be eligible for a refund. *Please note, all motors require oil and fuel prior to starting. Please follow the instructions in the manual.

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Moskva-Class Cruisers

Separate design teams often attempt to meet a set of ship specifications with completely different, although equally valid, strategies. To fulfill the requirements issued in April 2169 for the successor (NX-223) to the Daedalus class, which was introduced at the end of the Romulan War, Prosser & Ankopitch proposed a ship with an extremely large, spherical command hull attached to a nearly vestigial engineering hull. The proposal from the Mikoyan-Tupolev-Dassault Bureau used a long narrow command hull with a minimal frontal silhouette counterbalanced by an equally long engineering hull.

The engineers at Tezuka-Republic decided that the division of ship's functions between a command/crew hull and an engineering hull was arbitrary and unnecessarily restricted design options. Therefore, rather than gathering all the specified facilities in a single hull, their design TR-223A spread them across two hulls, as in Daedalus , and segregated the SSWR-IV-C warp core to a "bustle" at the extreme aft end of the secondary hull. This bustle could be separated easily and quickly from the rest of the engineering hull in the event of a warp core breach. The now-unpowered warp nacelles would then be shed. In this way, the demands of safety would be met without warp dynamics being degraded either by an excessively large frontal silhouette or by longitudinal warp field imbalance.

Although the Ship Specifications Review Board praised Tezuka-Republic for its creative solution to the problem of admittedly contradictory requirements for extreme safety and improved warp performance, they were forced to disqualify design TR-223A for not precisely meeting contract specifications. Therefore, in October 2171, construction contract NX-223 for Starfleet's new cruiser was awarded to Prosser & Ankopitch for what would become the Wasp class .

However, almost no one was happy with the new Wasp ships. Even before the contract was awarded, voices within Starfleet and within industry had strongly criticized the specifications of April 2169. These critics charged that they would lead to a mediocre, albeit safe, fighting ship. Two separate classes were needed, not a single class that was neither a proper explorer nor a proper warship. When Wasp was finally launched in 2173, her performance during precommisioning trials clearly showed that the critics had been correct. Although the performance problems were related in part to the continuing unavailability of the more powerful Tezuka-Republic Hiryu ("Flying Dragon") mark III warp nacelles, Wasp was obviously not the ship Starfleet had hoped for.

In a second attempt to obtain a reliable and capable warship, new specifications (NX-374) were issued in September 2175, little more than a year after USS  Wasp had entered service. Adding to this sense of urgency were intelligence reports suggesting that the Romulans had either developed or otherwise acquired matter/antimatter (M/AM) reactors. This time the specifications put less emphasis upon safety. The original requirement for completely separate command and engineering hulls was eliminated; instead, any hull configuration was allowed as long as the warp core could be quickly separated from the rest of the ship. Furthermore, requirements for speed, acceleration, and maneuverability both under impulse power and under warp power were increased, as were performance levels for target acquisition, tracking, and servicing.

These new specifications were a clear, albeit belated, admission that the critics had been correct all along: one class could not be expected to serve as both an explorer and a main battleship. In fact, starship technology was not considered sufficiently mature for a single ship to adequately fulfill both mission profiles until 2245, when the Constitution -class heavy cruiser was launched. (The controversy continues even today in the wake of the problems of the Galaxy -class explorer.)

Luckily, the designers and engineers at Tezuka-Republic had not been idle since their disappointing loss of the Wasp contract in 2171. Instead, they had spent their time refining design TR-223A so that their new entry (TR-374A) was markedly superior to what had been submitted 5 years earlier. In particular, the new SSWR-V warp reactor allowed the bustle to be made smaller, lighter, and even more easily separable. Therefore, it was hardly surprising when in November 2176 Tezuka-Republic was awarded the production contract over designs from Shimata-Dominquez, Prosser & Ankopitch, Mikoyan-Tupolev Dassault, Monarch R&U, and Thornycroft/Ebisu for what was to become the Moskva class.

However, engineering prowess may not have been the only factor in Tezuka-Republic's winning of the contract. There were accusations that the delay in delivery of the Hiryu warp engines was an attempt by Tezuka-Republic to prevent Wasp from reaching her designed performance levels. While no conclusive incriminating evidence has come to light, the delivery of the long-awaited engines shortly before the scheduled launch of Moskva in December 2177 is certainly suspicious. Tezuka-Republic maintains that if their submission of 2169 had been selected, its performance would also have not have met design specifications without the Hiryu engines. However, critics charge that TR-223A was not as reliant as Wasp on the type of engine used. Furthermore, once the Wasp contract was awarded, and even after Wasp was launched, Tezuka-Republic certainly made no efforts to accelerate delivery of Hiryu.

These controversies were soon rendered moot as the new Moskva class was recognized as a significant advance in starship design. The most important new feature was Moskva's discoid primary hull. Earlier designs had chosen a spherical primary hull for reasons of economy. Simple geometric relationships dictate that a spherical hull has the smallest surface area for a given volume. Therefore, construction costs are lower and shields are more efficient. Furthermore, institutional inertia had led nearly all exploratory cruisers originating until that time from the National Aeronautics and Space Administration, the United States Astronautics Agency, the United Earth Space Probe Agency, and its successor organizations to have spherical hulls.

The designers of USS  Moskva employed a biconvex disc for several reasons. Their initial motive was to increase hull volume while minimizing both frontal and lateral silhouettes. A warship with large frontal and lateral silhouettes would be at a greater disadvantage in most tactical situations than would be a ship with an increased superior silhouette. However, the discoid hull allowed the traditional radial layout of command hulls to be retained.

More important than these tactical advantages were functional advantages. As was shown with the Wasp class, warp field geometry would have been awkward if a spherical hull with its relatively large frontal area had been used. The discoid hull was also found to channel warp field flow across its upper surface towards the bussard ram scoops of the warp nacelles. This channeling effect improved field efficiency at all power levels and speeds. As the understanding of warp field mechanics was refined, the trend towards saucer-shaped primary hulls would be intensified in later Starfleet vessels.

In most respects, the Moskva class continued design and engineering trends established in the Comet and Daedalus classes introduced at the end of the Romulan War. As in these classes, ship functions were clearly divided between a command/crew hull and an engineering/propulsion hull. The bridge was returned to its customary position atop the command hull and the shuttlecraft bay was again placed in the secondary hull. The fusion reactor was centered along the longitudinal axis of the ship, and impulse thrust ports exited immediately in front of the warp bustle detachment seam.

Weaponry was the then-standard mix of fusion-warhead missiles and lasers. New to this class was an early type of ultraphased pulse laser cannon, two of which were mounted in the chin of the primary hull. Although the on-target energy output of this new weapon approached that of early phasers, its power requirement was higher and its range was substantially less. However, subsequent refinements lead to steady improvement and, ultimately, to the development of true phasers in 2202. Although Moskva -class ships were the first to be fitted with phasers in 2204, lasers were still carried by the Moskva class and later classes until the 2220s. Finally, warp capability was supplied by the long-awaited Hiryu mark III drive units.

The first ship of the new class, USS  Moskva (NCC-374), entered service with Starfleet in April 2179. An additional 30 ships (NCC-375 to NCC-404) joined the fleet through 2183. Moskva -class ships gained immediate popularity with officers and crews. First, total laser firepower was increased some 75% over that in the preceding Wasp class. Second, because the ship's mass was more equally distributed along the longitudinal axis than in the Wasp class, Moskva was significantly more maneuverable at both sublight and warp speeds. Finally, the more warp-dynamic design allowed greater cruising and maximum speeds.

The Moskva class had an outstanding safety record. No ships were lost because of mechanical failures. However, an incident occurred aboard USS  Johannesburg in 2186 when a faulty nacelle flow monitor falsely indicated a runaway positive feedback power loop within the plasma flow governor. Believing that a catastrophic warp core explosion was imminent, Chief Engineer Roberta Bocharnikov ordered the warp nacelles and warp bustle to be separated. Although unnecessary, these maneuvers were successful in causing the separated warp core to initiate its automatic shut-down routine. The warp core, nacelles, and the rest of the ship were towed to Starbase 13, where they were successfully re-mated. Despite her supreme embarrassment, Bocharnikov oversaw the reassembly and relaunching of Johannesburg and retained her position as chief engineer.

Although most ships of the Moskva class had left front-line service by 2215, some continued to serve as auxiliaries and training vessels until the 2240s. After retirement from active duty, Moskva -class ships were used as testbeds for many emerging technologies owing to the similarities of their layouts to those of succeeding classes. USS  Moskva was the site of the first successful ship-to-surface transport of a Human being in 2206, and USS  Gato was the first ship to fire photon torpedoes in 2214. In addition, Taurus -class tugs, which entered service in 2182, and Sanford -class repair tenders, which entered service in 2185, were derived from the Moskva class and used the same primary hull and warp drive assembly.

The Moskva -class cruiser USS  Aurora (NCC-377), a participant of the Battle of Eohippus IV, is on display at the Starfleet Museum.

Standard displacement: 67,750 t

Crew complement: 160 (27 officers + 133 crew) Weapons: 8 Type VI laser turrets (8 × 1 mounts), 2 Type VII laser cannons (fixed mounts), 2 missile launchers with 36 Spartak missiles Embarked craft: 4 medium cargo/personnel shuttlecraft, 2 light personnel shuttlecraft, 5 fighter/scouts Warp drive: SSWR-V-A spherical cavity M/AM reactor with 2 Hiryu III nacelles Velocity: wf 4.0, cruise; wf 5.0, supercruise; wf 5.2, maximum Units commissioned: 31

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• Sailboat Guide

Cape Cod Mercury 15 CB

Cape Cod Mercury 15 CB is a 14 ′ 11 ″ / 4.6 m monohull sailboat designed by Sparkman & Stephens and built by Cape Cod Shipbuilding starting in 1940.

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)

First built of fiberglass in 1948. There is also a fin keel version. (See separate record)

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Cape Cod Mercury 15 FK

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Dyna-Ski Boats custom builds outboard powered water ski boats for recreational skiers and show ski clubs. We have customers all over the world including Malaysia, the Caribbean, Moscow, Russia, the Cayman Islands and Canada. This blog is used to keep readers informed about what is going on at Dyna-Ski and answers questions that are frequently asked. You can also visit www.dyna-ski.com for more information about our boats. Contact Dyna-Ski at [email protected] or call 715-854-7501.

Tuesday, July 2, 2019

Update on things and how to buy a dyna-ski boat, sunday, june 16, 2019, it has been a long slow process . . . . . ., friday, march 9, 2018, update: latest things going on at dyna-ski boats, wednesday, october 25, 2017, don't try this at home.

Saturday, September 30, 2017

How to purchase a dyna-ski boat plus standard equipment & options links, thursday, september 21, 2017, face book and social media, tuesday, august 22, 2017, dyna-ski open bow videos.