The development of new technologies and new materials permits an optimization of the hulls for each application. Work boats have to be stable and have loading capacity, they have to withstand heavy sea’s. The revolutionairy model S&YSHCAT, catamarans with submerged floaters, gives a stability which has never been obtained before. The propulsion system and engines have to fit in this scope, they have to be high performing and light.
All this can easily be achieved with reinforced plastics, and even more, extreme design can be made for the greater joy of the owners.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. 5-series Aluminium alloys will not yield until about 39,000psi (275MPa) - roughly 30% stronger than steel.
Hull maintenance typically amounts to a cursory visual inspection, regular cleaning and replacement of the sacrificial anodes.
Aluminium does not need any protective painting, and the majority of operators do not apply anti-foul - this saves the cost of regular rubbing down and re-painting. Aluminium vessels have a high resale value thanks to the long life and high durability of the material. Seawork 2013 marked the fifth successive year that Aalco Metals has taken part and the company has already re-booked for next year.
Ophardt Maritim builds a range of hulls in aluminium and supplies these to owners or other shipyards for completion and fitting out.
The Opship hulls are supplied as the basic open hull, what the company calls a Boat Chassis, which gives the recipients a proven design on which to develop their own ideas for the completed vessel. The aluminium hulls are designed in three sizes and they are all based on a unique hull design that features a moderate vee hull with wide chines for easy planing. The hulls are primarily designed to accommodate outboard power with up to triple 300 hp outboards on the largest of the hulls to give high speeds.
The aluminium hulls are fully welded using 8 mm plating and fitted with closely spaced transverse framing.
The concept of the hulls developed by Ophardt Maritim is to offer an advanced and tried and tested hull concept at an attractive price. Location: UK I'm afraid you've missed the point Please excuse me if I have misunderstood you, but the point I was making was that the plans for the Aquarama - whatever the source - appear to be effectively in the public domain and the building of a boat using these plans - whatever the source - is unlikely to meet any legal obstacles short of an attempt to pass the boat off on resale as the genuine article. This is not a legal opininion; in fact, it was I who was asking for guidance, not giving it. I can appreciate boat designers having an acute interest in the legitimacy of boat designs; that is why I posted on this forum, to try and understand and respect these sensitivities. The only firm guidance I have found is not to call it a Riva, probably best not to call it an Aquarama, and to be honest if you ever come to sell it.
Location: UK This viewpoint is not sustainable, else Noah would be claiming royalties for every large boat bearing a similar name - notably a sequence of Royal Navy aircraft carriers. In closing, as a layman I am unable to comment on the quality of the plans, and to be fair that was not the underlying question at the start of this thread, nor the point which I raised about the legality of the affair. However, the seller of these plans appears to be bona fide and, if I may presume that it is he who started this thread, not nearly as dismissive of the legal rights issues as many designers appear towards his plans. Location: UK An addendum As I read through the other string, the following article by a US law firm was referred to. The comments in that article relating to the intellectual property in the Ford GT-40 confirms that the branding is a key issue; DON'T call it a Riva Aquarama, no matter how like one it is.
This is entirely consistent with my interpretation of the comments made by Riva Revival - don't call it a Riva, maybe not an Aquarama, don't seek to deceive anyone if you sell it, and it is unlikely that there will be any legal problems. A further quote from that thread neatly encpsulates this viewpoint - Quote: I'll start with the legal issues. If my reply of last evening sounded bad tempered, I apologize, there are a number of thorny questions here and I thank you for raising them. I also believe that many countries are signatories to an international copyright agreement.
As a creator of intellectual property I would like to know when my control over this property runs out? In my opinion it would be far better if the original plans were readily available from a recognized source, rather than widely available from shoddy sources. Finally Andrew, please find a competent yacht designer to re-create your copy of an Aquarama.
The key to the enforceability of copyright is established use and defence of the right, which is presumed to be waived if the would-be owner becomes aware of a potential infirngement and does not assert the right. The major pitfall waiting the unwary is - in common law countries as well as, I believe, in the US (in situations not covered by explicit legislation, patent or trademark) is passing off. I am grateful for your patience and kind guidance, but this thread has now reached a natural conclusion and I will be signing off now.
I luckily live in South Florida and have access to Florida Atlantic University Ocean Engineering Dept.
As to the legality of reproducing a version of the Aquarama I think that considering that Colombo has copied and modified the design, as well as Cometti, the aforementioned boys from the Netherlands goes to show what a beautiful design it is. I feel if you are going to build a boat with similar scantlings that as long as the craft is truly sea worthy and meets good overall construction, I’m all for it. In reality arguable Riva copied the barrel back from Chris Craft; in fact they copied each other in many respects as did all the early boat designers.
Carlos Riva, Chris Smith, Gar Wood, Don Mortrude, Bill MacKerer, Charles Raymond HuntJohn Hacker, George Crouch and even Dick Bertram all at one time made this classic hull.
Klaas van der Woude in Groningen is describing his build of a 30 feet long cold moulded beauty and what a fine craft he is completing.
I have designed a replica that is close to the Rive Aquarama Special and the Chris Craft as seen below. Location: United States Stepped hull pros and cons Thinking of making a smaller planing hull in the 15-17' range.
Location: Australia Do you see these stepped boats in the size range you specify, or in the waters you intend to be boating on ? Location: Eustis, FL Step shapes and locations are speed dependent, so the most efficient applications are targeted, meaning if you don't know where to place them or how to shape them, fooling around with steps will likely just drive you nuts. For your application, I would recommend against using a stepped hull because they are very easy to get absolutely wrong. In fact, for such a small boat, I generally do not use lifting strakes either, except for the chine strake.
Location: United States Thanks guys, I have been starting to see some stepped designs on smaller crafts and was wondering. Location: Kerkonkoski There is some experimentation with interceptors to substitute steps in the hull.
Location: Florida I have owned two stepped hull boats much larger than you are considering, a 33 and 38 foot intrepid, and the biggest issue is raising the planing speed. We built and succesfully tested a stepped hull of 12' lenght many years ago (1996), inside a R&D program made just to invetigate and consolidate stepped hull design methods and related software procedures. So, in our experience, also small planing boats can take advantages from stepped hull architecture. Originally Posted by jarmo.hakkinen There is some experimentation with interceptors to substitute steps in the hull.
A step has the purpose of reducing the wetted surface and keep the boat in a given trim angle and thereby reduce the resistance at a given speed. An interceptor has two functions, to create a dry surface aft and create a large lift in front. In my experiments, I have not found any problems with either the balance or taking up the boat on a trailer. A slightly larger boat with the same concept has recently awarded first prize in the Swedish Cruising Club design contest on future touring motorboat. How to build your proa, maybe you just want to extend Paul's boat by a couple of feet of so. If you have a table of offsets and want them extended by 25 percent, I can do this, just ask.
I would recommend ply over strip planking as I think it is faster and easier, especially for a deep Vee craft. Guest625101138 Previous Member   Have you looked at the Harrigami boats Rob Denney is now building?
Guest625101138 View Public Profile View Guest625101138's Gallery Find all posts by Guest625101138 « do these figures sound right?
03:51 PM  Can anyone give me information of modifying my hull for better performance? Performing boats can save crew out off dangerous situations where heavy boats can’t get away in time.
A relatively large craft built from aluminium will be lighter and stronger than if it where built from fibreglass. It takes a force of around 30,000 psi (207MPa) to bend mild steel to the point where it won't spring back into shape when released.
This means that given a weight constraint, we can afford to use about 3 times more material in an aluminium boat than in steel - allowing us to use thicker shell plating, bulkheads, frames and decking.

It has the highest strength of the non-heat treatable aluminium alloys and retains exceptional strength after welding. The money you will have saved having your steel boat repainted will more than pay back the difference.
Unlike fibreglass (which would require a mould for every permutation of the design), we can start with a basic hull and easily change the length, beam, cabin layout, deck configuration, etc. There is a deep narrow forefoot to improve the low speed handling and a flare in the bow to provide a dry ride.
This framing is both welded and glued in place, the glue creating a form of insulation that is designed to reduce the sound. These hulls are designed to meet the demands for a wide variety of workboat roles from fast patrol boats to rugged harbour workboats. However, unless someone can tell me otherwise, this is what I understand the position to be, based on a single telephone call with Riva Revival (who certainly appear to know what they are talking about when it comes to the Aquarama). It would be unfortunate if the only response was that, without the explicit written consent of the original designer, any replica would be theft, and this certainly does not appear to be the case with the Aquarama - otherwise someone would have nailed the builders of the Xtravaganza. Classic" has no clue about boatbuilding, surface fairing, naval architecture, or structural engineering. I conced that the design which I have purchased and which is supplied on CD does not cover all aspects of fitting out, nor indeed areas such as the potential sheathing of the hull or the achievement of the CE plate which is a legal requirement on all new-build boats in Europe. May I therefore pose this challenge to those who take issue with his proposition - who amongst you is going to commence legal proceedings against him, and on what basis, alleging what loss? However, unless someone else can prove ownership of the design (rather than the brand name) there is no obvious impediment to mimicking a classic but unregistered design. I'm absolutely in favor of recognizing the legal rights to a designer's work, regardless of whether the designer is living or dead. However, the legal concept of copyright is quite well defined, and is not at all as many laymen imagine it to be. Wierdly enough, this can be traced right back to the Roman ceremony of Mancipatio whereby legal title to goods was transferred, and this itself was almost certainly based on a religious ritual. If the re-seller of designs claims that these are authentic originals sourced from Riva, then, unless they are, he committing both a civil tort and, potentially, a criminal offence of deception.
I have purchased the plans being sold via ebay as 1970 Riva Aquarama Special only there is no such thing.
Simply put, if you have a step hull that is over powered for the configuration, you'll run out of the effective step range and ideally they should be in a different place or shaped differently.
As far as adding more power, well fishing shallow waters it's not an option most times because of the weight penalty.
I think they will have some serious challenges to figure out, including how to load and launch from a trailer. Even if the prothoptype was intended as about half-scale model of a bigger craft, its behaviour was totally good. Marine grade aluminium has such high impact resistance, that a Buddy boat can withstand a collision that would seriously damage a fibreglass craft. Of course, it is the exhibitors’ job to provide interesting and eye-catching displays, but past experience has shown that our investment in this particular event pays dividends. An interior deck can be supplied over the frames or these can be left exposed for the final builder to complete as required.
They are currently produced in sizes from 8 metres up to 12 metres and one of the main advantages is the quick delivery time. It is also true that the photos of the boat apparently under construction in Thailand are uninspiring. However, whatever CCSB's agreement with Herreshoff may have been, I seriously doubt they bought anything other than the patterns, the right to use the Herreshoff name, and Herreshoff's good will. Similarly, were I to build a boat and then try to resell it as a Riva Aquarama, the same would apply; the boat is not a Riva Aquarama, no matter how much like one it may look.
The same is true if running below the targeted speeds, the steps where designed to operate within.
One day when they make a DI 2-stroke that weighs what the older ones did this won't be an issue.
Also as others have said stepped hulls are fussy to get right and not easy on one-off designs. The design included one step and camber on forebody and afterbody, 18deg deadrise at step, and was intended to enhance performace at cruise speed, with high loads, in seaway. Marine grade aluminium also has excellent corrosion resistance, in most cases aluminium boats will last up to 50 years in the harsh saltwater environment. Alternatively the hulls can be specified for electric propulsion using the range of Deep Blue 80 electric outboards produced by Torqeedo and with a battery pack to offer range of over 50 miles at low speeds but with the larger electric outboards, a speed of 12 knots can be achieved but with a more limited range. Also by focussing on just producing hulls in aluminium Ophart is able to invest in advanced construction techniques. However, this does by and large appear to be the same starting point as suggested to me by Riva Revival.
Unlike a regular V bottom, steps narrow the speed range they're effective at, so lots of thought and experience needs to be put into their shape and placement. Intrepid is possibly the most successful stepped hull builders out there and even they have boats that can miss some of their handling targets.
Aluminium is by far the lowest maintenance material that could be used for boat manufacturing. They contain no information with regards to the decking king plank or any truly reliable information. Nestles is recomended only for advanced surfers.Click the photo below to view Nestles video. To suggest that their comments reflected commercial interests is therefore misguided and unnecessary. He has an excel spreadsheet of the offsets, how do I know, because he emailed it to me years ago.
By that I mean is better to start with a 19ft proa and extend to 22ft, than to start with a 17ft proa and extend to 22ft. In the circumstances, and whilst I am grateful for the informative references embedded in the other thread to the United States Copyright Office, I cannot see that these are relevant in the present case. So if you ask him nicely on the yahoo group I am sure he would be happy to forward that to you. On the other hand, the existence of a documented Patent or Trademark would support a legal action; in the case of the Riva Aquarama there does not appear to be any such instrument. P-Land is recomended for intermediate to advanced surfers.Click the photo below to view P-Lands album. Click the photo below to see The Points album.Fishing Panama, Surfer ParadiseFishing in the Gulf of Chiriqui region is regarded as a world class fishing destination. There have been many write-ups in sport fishing magazines about the marlin, sailfish, Wahoo and tuna that have been caught in this area.We operate primarily as a surf camp.
Fishing off the boats is offered at no charge as the boat captains drive around the surf breaks keeping an eye on the surfers.
There is no charge for this type of fishing.We also offer an outer island trip, which requires a payment of $320 for the extra gas used by the panga boat. We should be able to get out to the Coiba Island and Hannibal Bank area where large marlin and tunas can be caught. It has been described as the perfect wave you draw on your notebook in high school that just keeps going and going. Virgin Islands, and Puerto Rico).I called the Delta customer service rep to ask if that was a typo (mistake) and she said no. She answered Yes, that is correct.Heres a petition going around: Fight Airline Surfboard Charges Sick of paying airline surcharges for your board? The reason for the new price is because of the increase in fuel costs and other commodities that have steadily increased over the past two years. Improvements have been in the area of another honeymoon suit, new wood decking, new tiled floors, new boat, new motors, new rental surfboards, improved port facilities.
However, if you would like to lock in the old rate from 2008, then you will need to make a reservation and pay the deposit by December 31st, 2008.
Ive only been here a few days, but have added the best photos that Ive taken yet to my portfolio.
And, yeah, I caught my fair share of these bombs check my personal photo section to see for yourself!
Im in the process of adding photos with a slow, third world internet connection, so be patient theyre on their way.This place is so beautiful, and the place Im staying is something else.
These offshore breaks are heavy-duty, deep water reefs with some areas of dry-reef that need to be carefully negotiated. The vibe is so cool, and everyone is surfed out and in a good mood all day.Check the photos and book your tickets. He escapes the cold of Washington State to visit us in the warm waters of Panama during February and March. It has taken a little time to get from physically being at home to mentally being back as well.
My heart is always surfing around the world even if responsibility is trying to get in the way.
I will get some things done on the farm and then it will be back to the beach in Oregon.The attached picture was taken at Leftovers on the island of Outer Silva about 10 kilometers from Morro Negrito Surf Camp.

There are 4 breaks on the island and various snorkeling opportunities for the non-surfers or people who need a break. I mention this as on the 3rd day I was there, the waves were breaking in the 10 plus range with at least a 6 throw to the lip. It pitched me over the falls backwards and held me down for a long time in a lot of bubbles. I did not hit anything, although when I saw the magnificent Shuler epoxy surfboard that Lanny made for me to surf in Panama, was in 2 pieces.
This meant that I was going to have some short-board experience for the remainder of the stay.
I gave it a try and had my board leash come off my ankle and had to swim into the rocky shore. This picture was taken 2 weeks ago, was voted the wave of the day and is a true Monday Morning Wave.The guests, cooks and staff made this a time to remember, always. I wish this experience to all of you and thank everyone who made this happen.Have a great day,BobP. As a side note, I was able to come back 1st class on both flights from Panama City, Panama to Seattle, Washington, USA.
As good as the airline was the cooks at camp did it better job and their meals tasted superior. Panamanians have a strong sense of pride for their provinces, and the Foundation thought this would be an opportunity for the children to see some important parts of Chiriqui. Led by camp manager, Jeff Healion, ten children and nine parents enjoyed a two day excursion of learning, fun, and exploration set to the theme of Getting to Know my Province.A Traveling by boat and bus, the trip included visits to the mountain town of Boquete and the provincial capital, David.
The first stop was Paradise Gardens, an animal sanctuary and refuge in the cool highlands of Boquete, a thriving hub of coffee production and nationally famous for its coffee and flower fair.
Here, we enjoyed interactive tours of monkeys, exotic birds, endangered mammals, and an enclosed butterfly park. Most all the animals at Paradise Gardens have been rescued and are awaiting release back into the jungle.A After a picnic lunch in Boquetes main plaza, it was down to the warmer climes of David, Panamas thriving western hub of agriculture, business, and tourism. The group visited Culturama, a historical and cultural society located in one of the oldest buildings in Chiriqui. We learned about local history and were treated to entertaining stories by one of the areas best storytellers.A What is a field trip without a little down time, so we headed over to the theater and caught the new Disney holiday movie Enchanted followed by a stop at MacDonalds. After dinner we went to see Davids new million-dollar plaza, probably the nicest plaza in Panama, if not Central America. Just by luck, a local philanthropic organization was presenting a Christmas performance of dance, music, and holiday dramas in the parks amphitheater.
It was a lovely tropical evening and we enjoyed the festivities besides being tired from a day of busy events.
Finally, we made it to a comfortable nights sleep at Hotel Toledo.A Day two began with a fun breakfast at a popular downtown cafeteria where we were treated to a private reception room. From the restaurant we walked to the Sevillana Bakery where we enjoyed a full tour of the bakerys back kitchens. In Panama, as in much of Latin America, the bakery still plays a major role in peoples daily lives. At Sevillan, fresh bread slides out of the ovens nearly all day.A A short walk from the bakery we stopped at citys main fire station. Here we had a full tour of the facilities and then were treated to a simulated emergency call. We watched the firemen slide down the poles, put their suits on, and then leave the firehouse. After some fun pictures with the firehouse staff, we were on our way to our final destination.A Davids International Airport is the second largest in Panama and Aeroperlas, the regional carrier, had invited us to board one of their planes as it was being prepared for a flight. Probably not something we could have done in many countries, we all boarded the plane, visited the cockpit, and then relaxed in the cabin seats while the flight attendants answered questions from the children.
Wow, what a thrill for the children.A With just a few hours left before we needed to begin our journey back to camp, we spent a few hours looking around the busy commercial district of David, bustling with holiday activity. In Latin America, so much of the activity begins out in front of the stores so just walking around the streets is fascinating.A It is hard to imagine how our trip could have been more fun, rewarding, or educational. Sure we arrived back at the island tired, but the children were still buzzing with excitement from the events and what they had experienced. If you could have seen the smiles and eyes during the two days, you would all know how rewarding it is to share with those that are less fortunate.
During the holiday time, it was especially rewarding for us to share a magical treat with the children from our island. The old price has been $600 per week and the new price will be $650.The reason for the new price is because of the increase in fuel costs and other commodities that have steadily increased over the past two years.
Improvements have been in the area of another honeymoon suit, new wood decking, new tiled floors, new boat, new motors, new rental surfboards, improved port facilities.However, if you would like to lock in the old rate from 2007, then you will need to make a reservation and pay the deposit by December 31st, 2007. The 25 ft deep V hull boat can smoothly cut through big swells and is equipped with new twin 115 hp 4 stroke motors, live bait well, GPS fish finder and an onboard stereo system.
The Gulf of Chiriqui is located south of David and covers an area of 14,740 hectares plus a great number of Islands and Islets.
Among them you can find Isla Coiba, Isla Cebaco, Isla Montuosa, Boca Brava, Jicaron and Isla Secas with some of the best big game sport fishing, surfing and sport-diving in Central America. Hannibal Bank and Coiba Island are both well known sport-diving and salt water sport fishing destinations Panama Central America. This creates currents that are convenient when going on an offshore fishing salt water fishing trip.
The Coiba Island is now a patrolled national park and protected from commercial fishing within its boundaries. The island was first ruled by Coiba Indians and later ruled by Vasco Nues de Balboa who at some point was defeated by pirates. Besides from sport fishing, here you will find great opportunities for adventure travel or eco tourism. You will find a great variety of monkeys, iguanas, crocodile, snakes and over 133 different species of birds for those birdwatchers. Cebaco Island is located between Santa Catalina and Mariato West Coast of the Peninsula de Azuero. This island is home to some of the most beautiful beaches with crystal clear water and scenery for sport-diving, snorkeling or guided fishing trips. The Cebaco Bay is located south of the island and it is excellent for big game fishing or angling, sport diving and surfing.
Its reefs are home of Cubera Snapper, Roosterfish, Dorado, Monster Yellowfin Tuna (100 + pounds) and a variety of billfish such as sail fish Montousa Island is 10 miles off Hannibal Bank and it is also a great sport-diving spot in clear waters of Panamas Pacific Ocean. The bottom floor also rises dramatically from approximate depths of 10,000 ft making it great for deep sea fishing in Panama.
Moreover, this island is a boutique resort we operate with which was designed for those who want private, pristine surroundings with excellent service.
With a theme of Hacia el Futuro, or Towards the Future, the trip was for many of the participants their first travel outside the province and their first visit to the capital of Panama City. Over a period of two days, the group of students and parents, led by Morro Negrito Surfguide Jeff Healion, traveled to the Miraflores Locks of the Panama Canal, the ruins of the first settlement of Panama, the Presidential Palace which included a surprise meeting with President Martin Torrijos, and the new continent-spanning Centenario Bridge. Along the way, the group enjoyed some out-of-the-ordinary treats of pizza, ice cream, and holiday shopping at the new Albrook Mall at the site of the former US Albrook Air Base.The design of the trip was to bring the students in contact with the past, the present, and the future of their country through the ruins, the Canal, and the government buildings. At the Canal, the group was treated to a private presentation of the Panama Canal movie and then witnessed two giant Panamax ships passing through the locks.
Nothing could have been more surprising though than when Panamas President pulled up just as the group was visiting his palace.
As he left for his office, he commanded his staff to give the group a special tour inside the palace.Healion reported the smiles, excitement and gratitude we saw during the trip were heartwarming reasons why we know the Foundation can do good work. If a student wishes to continue, the family must send the child to the high school on the mainland. For most families, the cost of transportation, food, housing, and school supplies is a great burden and many are unable to send their children, especially those with several children.The educational assistance program will provide families with the funds necessary for supporting their children in higher education. In 2007, another two will be eligible to continue at high school if their families so decide. With the new program we hope that money will no longer be a factor whether families send their children.The surf camp enjoys close contact with all the families that will be involved in the program and will be able to monitor the progress of the students. We have seen many of these children grow up and it is especially rewarding to know they will have new choices and opportunities for their futures. We know their ties to the island will always be strong but we also hope that by continuing their education their new paths will show them what a truly special place their home is. September 2006, a one thousand watt wind turbine was installed that has been doing an excellent job of supplementing the solar system with wind generated power. Previously, the solar batteries would automatically disconnect themselves due to low voltage at about midnight. Hopefully, we can help inspire the camp visitors that come to surf camp to perhaps consider installing their own clean energy systems, wherever they may come from.
There are a number of artesian springs pumping a large amount of water out of the ground, so much that it has created several water falls on the island, explains Steve.

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