Spira International Boat Plans header graphic

Plans to build the 25' Kona Hawaiian Sampan

Kona Hawaiian Sampan

The Kona is my first foray into Hawaiian Sampan designs. At 25 feet, it is a convenient coastal size that may be trailered or kept in an inexpensive sized slip. I took the traditional hull shape and redesigned it to be built of lighter, inexpensive modern materials covered in tough fiberglass and epoxy. An inboard gas or diesel engine of 75-150 horsepower will get it up on a plane and cover the miles quickly without you breaking into an uncontollable string of foul language every time you go to the fuel dock.

Free Study Plans for the Hawaiian Sampan

Our study plans are two of the actual construction drawings. They're not enough information for you to build the boat, but they do give you the overall boat size, shape and construction methods. This is a pdf file readable with the free Adobe Acrobat pdf file reader.

Download Free Study Plans for the Kona Hawaiian Sampan

Purchase Construction Plans for the Kona Hawaiian Sampan

The construction plans are available for instant download from the Internet in Adobe pdf format, or in paper form printed on 18" x 24" (457 mm x 610 mm) bond paper. To purchase, you will be taken to a site where you may use a credit card or debit card. It utilizes the latest security so rest assured, your card number cannot be stolen. Please see our privacy policy. California residents must pay 8.75% sales tax.

IMPORTANT - Read Carefully Before Ordering

If you are purchasing plans that you will be downloading in electronic format, you will NOT be emailed the plans. You must complete the download process yourself. After completing the purchase and having your payment accepted, use the Return to Spira International link to take you to a secure page on the Spira International site where you may download the plans and instructions. DO NOT USE THE [BACK] BUTTON! We will be notified of your purchase, but are not informed if you completed the download of your plans or not. If, for some reason, you cannot download the plans immediately after completing the transaction, e-mail us and we'll make sure you receive the approprite link to download your plans.

If you are purchasing printed plans that you expect shipped to you, use the appropriate button below. The plans will be sent via USPS Priority mail. Allow 1-2 weeks if in the US, and up to 4 weeks or more outside the US.

Electronic Construction Plans for 25' Kona

Imperial (feet and inches) only
Downloadable PDF Plans

US$ 129.99

No Shipping - You Download Instantly

Printed Construction Plans for 25' Kona

Imperial (feet and inches) only
Paper Plans Mailed to You

US$ 144.99

+ Shipping ($5 USA, $15 International)

Mail, Phone or FAX Ordering Electronic or Printed Plans

If you wish to receive printed plans, or wish to pay by check, money order or credit card by mail, phone or FAX, just download the pdf order form and price list by clicking on the image below.

Download Boat Plans Order Form and Price List

Building a Wooden Boat

About Hawaiian Sampans

The island nation of Japan has a long, rich tradition of exceptionally seaworthy boat designs. In fact, the skeleton of a Jomon (Ancient Japanese) traveler was unearthed in Washington State and carbon dated to be 7000 years old! The only possible way he could have gotten there was to cross the North Pacific by boat. When Japanese immigrants came to Hawaii in the late 1800s and early 1900s, they brought with them their knowledge of boat design and construction. From this, the Hawaiian sampan was developed and became the predominant workboat in the middle of the Pacific.

The Sampan design has more recently given way to full planing deep vee hulls because engines became plenty powerful and fuel was cheap for a long, long time. Well, those happy days of burning plentiful cheap gas are over, and are likely never to return, so it's time to revive some of the successful hulls of the past, especially those that performed very well on modest power. Welcome back the Hawaiian Sampan, a semi-planing seaworthy hull that will really scoot along with modest power. Achieving 20 knots while burning only 3 or 4 gallons per hour is entirely possible. Most deep vee planing hulls of equivalent size will burn over double that amount of fuel for the same speed. You won't have the top end speed, but who needs to go that fast in the ocean anyway?