Croatian Travel Guide | Bass Fishing Techniques | Ice Fishing Tips
Articles Directory
Author Login Write for Us View Authors Contact Us Syndicate Site Map
Home : Articles

Categories
Search


Advanced Search
Other Sites
Horse Articles
Refrigeration articles
House surveys
Climbing info
Looking for a Puppy?
free webmasters directory
Seo website directory
 »  Home  »  Buying Guides  »  Cruising Boats Under 100k
Cruising Boats Under 100k
By John Holtrop | Published  01/16/2006 | Buying Guides | Rating:
John Holtrop
My engineering background is rock solid, my artistic ability is what it is. I have built boats using wood strips, stitch and glue techniques, and molded fiberglass. Some have been better than others, but they all floated without breaking! I select a building process assuming an inexperienced builder, having few tools, who wants the process to be simple and progress to be fast. Visit my site @ http://www.johnsboatstuff.com 

View all articles by John Holtrop
Introduction

The April 1998 issue of CRUISING WORLD contained an article I wrote titled Crunching Numbers For A Quality Cruiser. In it I presented a process that used fuzzy logic and a data base to select boats with characteristics suitable for offshore cruising. The process sorted out ninety boats that were CLOSE to the fuzzy logic template, and these were listed in a "Best Cruisers" list. The response from readers was very positive, and I would like to thank the many people who took the time to comment, ask questions, and suggest additional boats. Due to this participation, the data base has doubled in size, and now contains over 1100 monohull sail boats. I have also made several improvements to the selection process, including more emphasis on dynamic characteristics and the inclusion of retail prices. With this new price information, it is possible to identify potential bargains in offshore cruisers. Of course many other factors are important in selecting a cruising boat, like passing the survey, but looking at boats that are on the Best Cruisers list and within your price range, is a good place to start.

The Fuzzy Logic process allows boats to be scored on "how close" they come to the optimal values applied to a set of evaluation parameters. To make the Best Cruisers list, a boat must score greater than zero on all the parameters. Miss one, your out. These parameters (see EQUATIONS) include the traditional Disp / LWL and Sail Area / Disp ratios, as well as well as less known ones like Comfort Factor, Capsize Risk,.and Vmax / Vhull. The latest version includes the LOA / BEAM ratio, and a term called Max Acceleration. The Max Acceleration term is particularly interesting in that it introduces dynamic factors such as roll period and the moment of inertia into the evaluation. The acceleration level that the crew experiences as a boat rolls is especially important for safe offshore cruising. Prolonged exposure to high levels of acceleration can promote fatigue through sleep deprivation, which leads to mistakes and accidents. Adding these additional parameters makes the selection process more discriminating, and increases confidence that the selected boats are truly unique.

Once the evaluation parameters have been chosen, the optimal values for these parameters can be selected. In the original article I used my own "best judgement" for selecting the optimum values for the fuzzy logic variables, which was a somewhat subjective process. At the suggestion of my internet friend, Jim Manzari, I modified the way the optimum values are selected, and now calculate them directly from the work of nine well respected cruising boat designers. Average values for each of the seven fuzzy variables are calculated for each designers work, covering a total of 131 boats. The Optimal Value is then calculated by taking the average over all the designers. Figure 1 shows the results of this process

DESIGNER

S/D

D/L

CF

CR

Vm/Vh

L/B

ACCEL

ALBERG

15.94

365

30.9

1.68

1.08

3.35

.055

ALDEN

16.69

323

41.1

1.59

1.07

3.71

.050

CREALOCK

15.71

342

38.3

1.61

1.06

3.40

.049

BREWER

16.13

270

34.0

1.68

1.07

3.34

.065

HESS

15.90

320

34.2

1.60

1.07

3.34

.048

HOOD

15.38

335

43.5

1.59

1.03

3.49

.049

MASON

16.53

349

41.8

1.62

1.06

3.51

.049

PAINE

17.16

247

33.3

1.72

1.08

3.39

.075

PERRY

16.64

262

35.6

1.70

1.07

3.33

.069

Optimal Value

16.24

313

37.0

1.64

1.06

3.43

.057

FIG. 1 OPTIMAL VALUES

Figure 2 shows the current and past values for the Fuzzy Variables, along with the average from the entire data base.

FUZZY VARIABLE

NEWEST VERSION

APRIL 98 VERSION

AVERAGE OF DATA BASE

S/D

16.24

16

18.8

D/L

313

300

236

CF

37.0

35

29

CR

1.64

1.8

1.82

Vm/Vh

1.06

1.07

1.11

L/B

3.43

Not used

3.34

ACCELERATION

.057

Not used

.12

 

FIG. 2 COMPARISON OF OPTIMAL VALUES

Fortunately, the new optimal values did not change all that much, but its reassuring that the ones used now are mathematically linked to the actual work of nine well known yacht designers. Its interesting to compare these cruising boat values with the averages over the entire database. Cruising boat designs show a definite trend away from the average boat, with less sail area, more weight, higher comfort factor, lower capsize risk, and half as much acceleration. My interpretation of this data is that it shows that most of today’s boats are designed for high performance and coastal cruising. These are not "bad" designs, they simple reflect what the majority of today’s buyers consider important. It does point out, however, the need for cruising boat purchasers to understand these fundamental differences so that they can make informed decisions based on how they intend to use the boat.

Once the optimal values have been selected, an acceptable region around each (called a HEDGE in fuzzy logic) is calculated. I use the "standard deviation" of each variable ( a term that statistically measures the spread in data) to set the acceptable range for each of three hedges, VERY CLOSE, CLOSE, and SOMEWHAT CLOSE. Using the VERY CLOSE hedge returned only three boats. Going to the CLOSE hedge increased that number to 59, and using the SOMEWHAT CLOSE hedge returned a total of 164 boats, the latter being the hedge level used in this article. Boats in the Best Cruisers list were first scored together, then broken down into length categories. The individual scores are not listed. All the boats are approximately equal, and fully compatible with our best cruisers template. 

For the most part, the Best Cruisers list has not changed a great deal, which is reassuring, but many of the smaller boats, like the Catalina 27 and Allegra 25 were eliminated, due to low comfort factor or high acceleration. The comfort factor is closely related to the roll period, as is acceleration, and the smaller boats just don’t have enough weight. For the gentle motions characteristic of a comfortable cruising boat, big is always better. The 164 boats listed are only a few boats more then the 154 found in the previous article, even though the size of the data base has more than doubled. This infers that only a relatively small number of cruising boat designs are needed to satisfy today’s market. Only a few builders target the cruising boat market, since these are low production rate, labor extensive products, with extremely high prices.

The used boat market is the only alternative for many buyers, and quite a few older cruising boats are available, some at bargain prices. Price information is not in my data base due to its changing nature, but realistically it is an extremely important factor in selecting a cruising boat. With some help from Charlotte Schmidt (a local yacht broker who specializes in cruising boats), several internet sources, and some time perusing magazines, I was able to find 36 boats that were both on the Best Cruisers list and priced less than $100,000. The results of this effort, broken into price ranges, are shown in the Best Cruising Boat Values list. The boat listed offer a variety of style, from traditional double enders like the North Sea 27 and Jason 35, to reverse transom ocean racers like the venerable Cal 40. The under $25,000 category are mostly small ( 30 feet and under ) boats, but these are affordable choices for single handers or young couples, and if a larger boat is needed, the Colombia 34 is a lot of boat for the money. The 25 to 50 k group ranges from the traditional styled Jason 35 to the roomy Colombia 43 MK III. Above 50 k the boats seem to settle around the 38 to 40 foot size, and include many well know cruisers like the Cal 40, Corbin 39, Cabo Rico 38, Pacific Seacraft 37, Tayana 37, and the Valiant 40.

When evaluating a used boat purchase, try to collect as many facts about the boat as possible. The most successful transactions are often the result of an informed buyer knowing the basic factors normally associated with a quality cruising boat, and the trade off that result when these factors are missing. My Best Cruisers list is a good place to start but you should let your own requirements influence the final selection. Its not difficult to run through the numbers on your own and find out where a particular boat differs from the Best Cruisers List. If it’s a small factor, like slightly to little or to much sail area, it may not be important. On the other hand, if the Disp / LWL ratio is low and the acceleration level high, and you like a smooth ride, then be cautious. If your not familiar with the design, the rec.boats.cruising news group on the internet is a good source for unfiltered advise. It goes without saying, of course, that any boat purchased for offshore cruising should pass a through survey. Again, the key factor is "make an informed decision" - use every tool available.

Finding a boat within your price range and on the Best Cruisers List is a good start, but these are older boats and many will need extensive rework before an offshore voyage Cosmetic work like varnishing and "remove and replace" tasks are not difficult, and are well within the capabilities of most cruising sailors. The hull can be painted, the mast stripped and coated, rigging and sails replaced, and many interior upgrades completed for a fraction of the cost of a new boat. Be careful to avoid projects involving rotted wooden structural members, really sever blistering (relamination required), or other serious structural problems, unless your ready to spend some serious time and money. Fortunately, many of the older designs, like the CAL 40 and Colombia boats were over designed by today’s standards, and have structures with a lot of life left in them. Even if the structure is sound, be sure to not underestimate the cost involved in bringing one of these boats up to offshore standards. While each case will be different, many spend at least the purchase price of the boat on upgrades. Be sure to include these costs in your final decision.

The boats on the Best Cruisers List mirror the work of well known cruising boat designers. If your thinking about buying a boat for offshore cruising, looking at these boats is a good place to start. Evaluate them based on your own requirements and determine what trade off are acceptable. Once you feel comfortable about the boat, have it inspected by a competent marine surveyor and get estimates for the cost involved in bringing the boat up to blue water standards, before you sign anything. Use all the resources you can to evaluate potential cruising boats. You may still choose to tackle Cape Horn with your Collapso 40, but at least it will be an informed choice.


Comments