4-Valve vs 2-Valve Head

 

2-Valve Head

One intake valve (usually larger) and one exhaust valve (usually smaller).

4-Valve Head

Two Intake (larger) and two exhaust (smaller) valves.

The 4 valve head usually allowed for greater air and exhaust exchange especially when vortexed.

Other Valve Arrangements

5-Valve head

3 Valve Head

1 Valve Head

This is often called the “F” head. It still has two valves per cylinder, the second valve is a “side valve” in the block.

No Valve Head (Non, Zip, Zero)

Commonly called a “Flat Head” or “Side Valve” engine. All the valves are in the block.
A popular marine engine example would be the Atomic-4.

An Atomic-4 cylinder block with all valves removed.

The most popular “Side valve” engine of all time was the Ford “Flat Head” V8.

Other popular “Side Valve” engines include the earlier Ford Model T and Ford Model A, the Chrysler Crown, and Willys Jeep.

The combustion chamber volume required to accommodate the “Side Valves” limited the compression ratio of these engines. Thus the performance of these engines was rather poor, but benefited greatly from supercharging. Unfortunately, the bottom-ends (crankshaft, main bearings and connecting rod bearings) were rarely designed to carry the additional loads of a supercharged engine, thus early failure was common when these engines were “souped up”.


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16.02 –  ^  12 Volt Bible for BoatsMiner Brotherton B
16.02 –  ^  12 Volt Doctor's Practical HandbookEdgar J. Beyn B
16.02 –  ^  Aluminum BoatbuildingErnest H. Sims B
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16.02 –  ^  American Merchant Seaman's Manual : For SeamenSeamen? B
16.02 –  ^  Basic Navel ArchitectureKenneth C. Barnaby B
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16.02 –  ^  Boat Owner's ManualIntertec B
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16.02 –  ^  Boater's Pocket ReferenceThomas McEwan B
16.02 –  ^  Boating Magazine's Powerboater's Guide to Electrical SystemsEdwin R. Sherman B
16.02 –  ^  Boating Magazine's Quick & Easy Boat MaintenanceSandy Lindsey B
16.02 –  ^  Boatkeeper : … Maintenance‚ Repair‚ ImprovementGladstone & Bottomley (Eds) B
16.02 –  ^  Boatman's Handbook : The New Look-it-up BookTom Bottomley B
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16.02 –  ^  Boatowner's Illustrated Electrical HandbookCharlie Wing B
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16.02 –  ^  Boatowner's Mechanical & Electrical ManualNigel Calder B
16.02 –  ^  Boatowner's Practical & Technical Cruising ManualNigel Calder B
16.02 –  ^  Commissioning & DecommissioningPractical Sailor Library B
16.02 –  ^  Complete Guide to Outboard Motor Service & RepairPaul Dempsey B
16.02 –  ^  Complete Powerboating ManualTim Bartlett & Simon Collis B
16.02 –  ^  Concrete BoatbuildingGainor W. Jackson B
16.02 –  ^  Cost Conscious CruiserLin & Larry Pardey B
16.02 –  ^  Diesel Engine MechanicsWayne A. Kelm B
16.02 –  ^  Diesel EnginesJ. W. Anderson B
16.02 –  ^  Diesel TroubleshootierDon Seddon B
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16.02 –  ^  Don Casey's Complete Illustrated Sailboat Maintenance ManualDon Casey B
16.02 –  ^  Electrical Handbook for RVs‚ Campers‚ Vans‚ Boats & TrailersHerb Gill B
16.02 –  ^  Electrics AfloatAlir Garrod B
16.02 –  ^  Engines Afloat : From Early Days to D-Day Vol 2Stan Grayson B
16.02 –  ^  Essential Boat MaintenancePat Manley & Rupert Holmes B
16.02 –  ^  Fiberglass Boat Survey ManualArthur Edmunds B
16.02 –  ^  GammelmotorenValdemar Steiro B
16.02 –  ^  Handling Troubles Afloat : What to Do When It All Goes WrongJohn Mellor B
16.02 –  ^  Handyman Afloat & AshoreKen Bramham B
16.02 –  ^  How To Repair Diesel EnginesPaul Dempsey B
16.02 –  ^  Inboard Motor InstallationsGlen L. Witt & Ken Hankinson B
16.02 –  ^  Inspecting the Aging SailboatDon Casey B
16.02 –  ^  Internal Combustion Engines — USCG B
16.02 –  ^  Inboard Engine‚ Transmission and Drive Service : ManualIntertec B
16.02 –  ^  Kawasaki Jet Ski Shop Manual‚ 1976-1988Ron Wright B
16.02 –  ^  Know Your Boat's Diesel EngineAndrew Simpson B
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16.02 –  ^  Outboard Motors Maintenance and Repair ManualJean-Luc Pallas B
16.02 –  ^  Powerboat Care and RepairAllen D. Berrien B
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16.02 –  ^  Preliminary Design of Boats & ShipsCyrus Hamlin B
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16.02 –  ^  Quick & Easy Boat Maintenance : 1‚001 Time-Saving TipsSandy Lindsey B
16.02 –  ^  Reeds Diesel Engine Troubleshooting HandbookBarry Pickthall B
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16.02 –  ^  Replacing Your Boat's Engine (Adlard Coles Manuals)Mike Westin B
16.02 –  ^  Run Your Diesel Vehicle on BiofuelsJon Starbuck & Gavin D. j. Harper B
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16.02 –  ^  RYA Book of Diesel EnginesTim Bartlett B
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16.02 –  ^  Seaworthy: Essential Lessons from BoatUS — Robert A. Adriance – BoatU.S. B
16.02 –  ^  Seloc Bombardier Sea-doo Personal Watercraft … ManualClarence W. Coles. (T) B
16.02 –  ^  Seloc Kawasaki Personal Watercraft‚ 1992-97 Repair ManualJoan Coles B
16.02 –  ^  Seloc Yamaha Personal Watercraft … ManualClarence W. Coles B
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16.02 –  ^  Small Boat Engines - Inboard & OutboardConrad Miller B
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16.02 –  ^  Sorensen's Guide to Powerboats — Eric W. Sorensen B
16.02 –  ^  Stability and Trim for the Ship's OfficerWilliam E. George (Ed) B
16.02 –  ^  Stapleton's Powerboat Bible : How to Buy‚ Equip‚ and Organize …Sid Stapleton B
16.02 –  ^  Strength of Aluminum vs Strength of SteelKasten B
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16.02 –  ^  Surveying Small CraftIan Nicolson B
16.02 –  ^  Take the Mystery Out of Boat MaintenanceLawrence A. Diamond B
16.02 –  ^  The Adlard Coles Book of Diesel EnginesTim Bartlett B
16.02 –  ^  The Adlard Coles Book of Outboard MotorsTim Bartlett B
16.02 –  ^  The American Rowboat Motor: An Illustrated HistoryArlan Carter B
16.02 –  ^  The Boat Repair ManualGeorge Buchanan B
16.02 –  ^  The Boatman's Guide to Modern Marine MaterialsErnest A. Zadig B
16.02 –  ^  The Boatowner's Guide to Corrosion — Everett Collier B
16.02 –  ^  The Care and Repair of Small Marine DieselsChris Thompson B
16.02 –  ^  The Classic Outboard Motor HandbookPeter Hunn B
16.02 –  ^  The Complete Book of Pleasure Boat EnginesErnest A. Zadig B
16.02 –  ^  The Diesel CompanionPat Manley B
16.02 –  ^  The Essential Boat Maintenance ManualJeff E. Toghill B
16.02 –  ^  The Golden Age of the Racing Outboard — Peter Hunn B
16.02 –  ^  The Illustrated Encyclopedia of Ships‚ Boats‚ …Graham Blackburn B
16.02 –  ^  The Motorboat Electrical and Electronics ManualJohn C. Payne B
16.02 –  ^  The Napier WayBryan Boyle BB
16.02 –  ^  The Old Outboard BookPeter Hunn B
16.02 –  ^  The Small-Engine HandbookPeter Hunn B
16.02 –  ^  The Vintage Culture of Outboard Racing — Peter Hunn B
16.02 –  ^  The Young Sea Officer's Sheet AnchorDarcy Lever B
16.02 –  ^  Theory and Practice of Propellers For Auxiliary SailboatsJohn R. Stanton B
16.02 –  ^  This Old BoatDon Casey B
16.02 –  ^  Troubleshooting and Repairing Diesel EnginesPaul Dempsey B
16.02 –  ^  Troubleshooting Marine DieselsPeter Compton B
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16.02 –  ^  Understanding Boat DesignEdward S. Brewer B
16.02 –  ^  Understanding Boat Diesel EnginesJohn C. Payne B
16.02 –  ^  Watch It Made in the USA : Visitor's Guide to the Best Factory Tours — Karen Axelrod B
16.02 –  ^  What Shape Is She In?. A Guide to the Surveying of BoatsAllan H. Vaitses B
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16.03 – Magazines: (Incl. Articles‚ Back Issues‚+). T
16.03 –  ^  The ANCHOR — Anchors Aweigh Academy M
16.03 –  ^  DIY Boat Owner - The Marine Maintenance MagazineBoatUS Mad Mariner (OoB) M
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16.03 –  ^  ^  The Kittyhawk: The Little-Known History of Orville Wright's Canadian Getaway and His Beautiful Boat MA
16.03 –  ^  Rudder (The Antique & Classic Boat Society) Article Archive M
16.03 –  ^  ^  Major New Marine Engine History Book: Review of Engines Afloat MA
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16.04 – Videos: (How-to-Tutorials‚ Documentaries‚ Travelogues‚+). T
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16.05 –  ^  Anchors Aweigh Academy V
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16.05 –  ^  ^  Aluminum CareDon Casey WA
16.05 –  ^  ^  Carbon Monoxide = Silent KillerDon Casey WA
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16.05 –  ^  ^  Leader Tractors: No Longer a Leader WA
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16.05 –  ^  Martin's Marine Engineering PageMartin Leduc W
16.05 –  ^  ^  The Diesel engine and its development: A historical timeline — Martin Leduc WA
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16.05 –  ^  Rudder (The Antique & Classic Boat Society) Article Archive W
16.05 –  ^  ^  Major New Marine Engine History Book: Review of Engines Afloat MA
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16.05 –  ^  VintageOutboard.com W<
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Visit our FEATURED ARTICLES Home Page
to see examples of our website's comprehensive contents!

Thanks to our amazing contributors for the steady flow of articles, and to our dedicated all-volunteer staff who sort, polish and format them, everyday we get a little bit closer to our goal of
Everything About Boats. If you would like to submit an article,
See Submitting Articles.


— TOP 20 MOST POPULAR ARTICLES —

Detroit Diesel 8.2 Liter “Fuel Pincher” V8 Engine
Cummins V-555 & VT-555 “Triple-Nickel” V8 Diesel Engine
Lehman 120 (6D380) Diesel Engine (Ford 2704C & 2715E)
Ford Industrial Power Products Diesel Engines
How to Identify Ford Diesel Engines
Ford 2715E Diesel Engine
Lehman Mfg. Co.
Perkins Engines
Universal Atomic 4
Sears Boat Motors: Motorgo, Waterwitch, Elgin, etc.
Chrysler & Force Outboards
Eska Outboard Motors
Allison Transmission
ZF Friedrichshafen AG
Marine Surveyors by Country
American Marine Ltd (Grand Banks)
Boat Inspection (Types of Marine Surveys)
Boat Builders: (A∼Z) (w/Vessel Types, Locale & Years Active)
USCG NVIC 07-95 Guidance on Inspection, Repair and Maintenance of Wooden Hulls
American Boat and Yacht Counsel (ABYC)


Layout of the EverythingAboutBoats.org Website's Pages

— Types of Webpages —
This website consists almost entirely of 3 types of webpages as follows:

  1. TOPIC PAGES (See Main Topic Pages listed on Website Contents or the Right Sidebar)
  2. VENDOR PAGES (Vendors of Products, Services, Events,+, DestinationsMedia Creators)
  3. PRODUCT PAGES (Equipment, Events, Media: pDoc, Books, Magazines, Videos, Websites,+)

Clickable Links that lead to other webpages appear in Blue Text and usually open in a new window.
Links in the Right Sidebar and most directories open in the current window, not a new window.

Note in the examples above that these pages form a natural hierarchy.
The unnumbered "^" pages are listed alphabetically in most tables.

Media Titles in tables are distinguished by their smaller font size.
Media (Books, Magazines, Videos, Articles,+) are treated as Products.
Vendors' Product Documentation (pDoc) are considered Media.
Destinations & Media Creators are treated as Vendors.
All Website Pages are optimized for viewing on
full-width disktop computer monitors,
but can be viewed on phones.

— Contents of Webpages —
Website Pages typically contain the following Sections:

  1. PATH (Shows the chain of EAB pages w/links that lead to the page being viewed).
    1. EXAMPLE:
      PATH: HOMEWEBSITE INDEX, WEBSITE CONTENTS » ∨
      BOAT BUILDING & REPAIR » Boat Equipment » Propulsion » Engines » ∨∨
      ∧∧ Ford, Ebro, American Diesel, AmMarine, Barr, Beta, Bomac, Bowman, Couach,
      Lees, Lehman, Mermaid, Parsons, RenaultSabre, Thornycroft, Wortham Blake »
      DO-IT-YOURSELF » DIY Boat Building & Repair » DIY Schools & Classes »
      MEDIA w/Creator Directory » Documentation, BooksMagazinesVideosWebsites »
    2. (The "»" right pointing Guillemet symbol shows the chain through the page links.)
    3. (The "," comma between page links in the chain indicates pages are not subordinate, but are instead at the same level. See engine brands in the example above.)
    4. (The "∨", "∨∨", "∨∨∨",+ symbols indicate that the path line continues with whatever follows the "∧", "∧∧", "∧∧∧",+ symbols respectively. "∧" Precedes each MAIN TOPIC Page.)
  2. PAGE CONTENTS (Table of Contents with links to each main section on the page).
  3. PAGE BODY (The type of page determines the contents of its body as follows:).
    1. TOPIC PAGES (Topic Treatment: Introduction, Overview, Background, Details,+).
      • (Many Topic Pages contain Directories of Vendors with Links).
      • (Most Directory Listings are Alphabetical and/or by Locale).
    2. VENDOR PAGES (Vendor's Profile, Contact Information, Products, Services,+).
      • (Manufacturers, Resellers, Refitters, Yards, Surveyors, Clubs, Schools, Authors,+).
      • (Boating & Travel Destinations are treated as Vendors on their own Vendor Pages).
    3. PRODUCT PAGES (Product Features, Vendor Links, Specifications, Documentation,+).
      • (Media created by a vendor is often treated as a Product on its own Product Page).
      • (Boating & Travel Events are often treated as Products on their own Product Pages).
  4. RELATED RESOURCES (Topics, Vendors, Products, Media: Books, Websites,+ with Links).
  5. PAGE TAIL Contains the following Anchors Aweigh Academy & EAB Website Features:
    1. The Anchors Aweigh Academy's EverythingAboutBoats.org Header.
    2. A link to our Featured Articles EAB Home Page.
    3. Top 20 Most Popular Articles. (The section that appears right above this section).
    4. Layout of the EverythingAboutBoats.org Website's Pages. (This very section).
    5. Topics of Webpages. (The very next section below).
    6. What we have accomplished so far.
    7. Members must Sign-In to gain full access to Expanded Pages & Programs.
    8. Sign-Up (if not already a member).
    9. Public Comments (about the website & about this page).
  6. RIGHT SIDEBAR (Website Contents menu with links to Main Topic & Subtopic pages).
    (On some smart phones, the Right Sidebar may appear at the bottom of the webpage)

— Topics of Webpages —
Website Pages are categorized under the following 16 MAIN TOPICS:

The MAIN TOPICS follow a natural progression from conception of the vessel thru its
building, marketing, survey, financing, insuring, transport, moorage, use and upkeep.
The MAIN TOPICS (all Caps) below are followed by their Main Subtopics with Links.

00 – HOME: CONTENTSABOUT EAB: Contact EAB, Abbreviations & Symbols, FAQ, GLOSSARY, ADs,+.
01 – ABOUT BOATS w/Museum Directory: Early History, Recent History, Modern Vessel Types,+.
02 – BOAT BUILDING, OUTFITTING, REFITTING & REPAIR: Materials, Equipment, Builders,+.
03 – BOAT MARKETING: Boat Shows, Dealers & Brokers, Importing & Exporting, Auctions & Sales,+.
04 – BOAT INSPECTION: Types of Marine Surveys, Marine Surveyors, Schools, DIY Inspections,+.
05 – BOAT TITLES & VESSEL REGISTRY: Boat Title & Registration, Vessel Registry, Title Co's,+.
06 – BOAT FINANCING: Conventional (Banks, Credit Unions,+), Unconventional (Creative),+.
07 – BOAT INSURANCE: Maritime & Recreational: Coverage, Carriers, Agents,+., Claim Processing,+.
08 – BOAT TRANSPORT: By Sea (Piggyback, Delivery Skippers & Crews, & Towing), Over-Land,+.
09 – BOAT HAULING & LAUNCHING: Drydocks, Ways, Lifts, Cranes & Hoists, Launch Ramps,+.
10 – BOAT MOORAGE & STORAGE: Builders, Anchorages, Marinas, Yards, Racks & Stacks,+.
11 – BOATING ORGANIZATIONS: Yacht Clubs & Sailing Clubs, Paddling Clubs, Boat Owners,+.
12 – BOATING & TRAVEL: Events, Destinations, Boat Rentals & Charters, Cruises, Voyages,+.
13 – BOATING & MARITIME EDUCATION: Recreational Seamanship, Ship's Master & Crew,+.
14 – MARINE LAWS & REGULATIONS: International & National LawsLawyers‚ Investigators‚+.
15 – DO-IT-YOURSELF: DIY Boat Building & Repair, DIY Boat Sales, DIY Boat Surveys, DIY Classes,+.
16 – MEDIA w/Creator Directory + Academy eLibrary: pDocs, Books, Magazines, Videos, Websites,+.

The above MAIN TOPICS and a more detailed listing of Subtopics
can be found on the Website Contents page and on the Right Sidebar.
An Alphabetical Index of the website can be accessed at Website Index.


What we have accomplished so far.
Anchors Aweigh Academy and its EverythingAboutBoats.org website.

  • Published over 50,000 website pages about boats and boating, bringing us closer to reaching our goal of becoming "The ultimate reference resource about boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner!"
  • Published over 300 website main topic webpages, many with full articles on the topic. See our Website Contents or the Right Sidebar for the listing of the main topic pages.
  • Published over 9,000 marine vendor webpages, all with their contact information, most with a description of their products and services, many with product documentation, specifications and independent reviews. (incl.: Boat designers, boat building tools, material and equipment manufacturers and suppliers, boat builders and dealers, yacht brokers, marine surveyors, boat insurers, boat transporters, skippers and crews, boatyards and marinas, yacht clubs, boat rentals and yacht charters, boating, seamanship and maritime schools, marine law attorneys and expert witnesses, boat refitters and repairers, book authors, magazine publishers, video producers, and website creators)
  • Acquired over 120,000 pages of product documentation including Catalogs, Brochures, SpecSheets, Pictures, Serial Number Guides, Installation Manuals, OpManuals, Parts Catalogs, Parts Bulletins, Shop Manuals, Wiring Diagrams, Service Bulletins, and Recalls. And have made all viewable to Academy Members through our EAB website eLibrary.
  • Acquired over 1,200 books and magazine back issues in our academy library and so far have made over 700 viewable to Academy Members through our EAB website eLibrary.
  • Published over 500 DIY How-To articles about boat design, construction, inspection, operation, maintenance, troubleshooting and repair. We are working hard to do more.

We are currently formatting and polishing the Anchors Aweigh Academy online and hands-on courses. Our Marine Surveying course has proven to be excellent for both the beginner and the seasoned surveyor, and especially helpful to the Do-It-Yourselfer.


Current Academy Members must SIGN IN to gain FULL access to this
website including expanded pages and valuable Academy programs
like our Academy eLibrary and our Ask-An-Expert Program!

If your membership has expired, CLICK HERE to Renew.

IF YOU ARE NOT YET AN ANCHORS AWEIGH ACADEMY MEMBER,
CLICK HERE to discover how you can become a Member and gain FULL access to
thousands of expanded pages and articles, and dozens of excellent programs
WITH JUST A SMALL DONATION!


Comments for Public Viewing

Submit any comments for public viewing via email To: CommentsEverthingAboutBoats.org (Replace "" with "@")
Please remember to put this webpage's title in the subject line of your email.
All comments are moderated before they appear on this page. See Comment Rules.

General Comments About the Website

FROM Donald: "This is an awesome website. I found the information that I needed right away from one of the over 20,000 free articles that you provide as a public service. I'm surprised that so much if this site is free. But I still signed up so I could access the thousands of expanded pages, interesting articles, and dozens of valuable programs! The member's library of books, magazines and videos that I can view online is really terrific! I understand that you and your staff are all unpaid volunteers. Please keep up the good work. And I commend you for your plans to add another 10,000 free informative articles over the next year. I'm thrilled to support you in this endeavor with my small membership donation. Thanks again for all your hard work."

FROM Huey: "I agree with my Uncle, I too have found the articles to be very enlightening. They say that it will take about 100,000 articles to cover the full scope that they have envisioned for the website. They have over 20,000 articles so far and that's doing pretty well, but it could take several years to get the rest. I also noticed that many of the Main Topic Pages and some of the article pages are still in the rough draft stage. I guess that they will fill in as they can get volunteers to work on them. But what I can't figure out is why anyone would spend the time writing informative in depth articles just to give away free to this website for publication? What's in it for them?"

FROM Dewey: "Well Huey, to me It looks like most of the articles on this website are written by very informed people, like boating instructors, boat designers, boat builders, riggers, electricians, fitters, marine repair technicians and marine surveyors. Writing such articles helps establish them as knowledgeable professionals. After all, this website was originally created by a school for marine technicians and marine surveyors. The website is growing in content every day. They even had to move to a bigger, more powerful server because the website's traffic has been growing exponentially."

FROM Louie: "I agree with everyone above. This site is quickly becoming the ultimate reference resource about every aspect of boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner. I use the topic pages on the right sidebar to browse around the website. It's like a Junior Woodchucks' Guidebook for Boaters. Their Members' Library of over 300 popular and obscure books and over 200 magazine back issues that can be viewed online is fabulous. The Academy's magazine is especially informative. On top of that, there is the "Ask-An-Expert program for members where you can get an expert's answer to any of your boat questions. And a whole years membership is only $25. What a deal! I really love being part of this "Everything About Boats" community and help provide thousands of helpful articles free to the public. I think that I'll sit down right now and write an article about my experiences boating with my uncle."

FROM Scrooge: "You rave about this website like it was the best thing since sliced bread. Well, I think it stinks. Sure, it has a lot of good information for boaters, and they're adding more every day, but it will probably never be finished. Furthermore, I don't even own a boat. And I wouldn't have a boat even if someone gave me one. Boats are a waste of money and time and energy and money! They're just a hole in the water you pour money into. If you gave me a boat, I'd sell it quicker then you could say Baggywrinkle. Then I'd lock up the cash with all my other money so I could keep my eye on it and count it every day. Bah humbug."

FROM Daisy: "I'm just so glad that Donald got the boat so we and the boys could enjoy boating — together. And of course all of the girls, April, May, and June, love to be on the water too, especially when that is where the boys are. Oh poor Scrooge, boating is more fun then you could possibly imagine."

FROM Scrooge: "After seeing how much fun you all have on the water together, I regret that I didn't have that much fun when I was young. I've had a change of heart, and I'm giving each of you a Lifetime Academy Membership."

FROM Editor: "For those of you that have stayed with us this far, many thanks, and we hope that you found this little narrative informative. Your faithful support inspires us to keep working on this phenomenal website. We know that we have a lot more to do. Ultimately, we hope that we can help you enjoy the wonder filled world of boating as much as we do. We are all waiting to see what you have to say about this webpage article. Submit any comments via email To: CommentsEverythingAboutBoats.org (Replace "" with "@"). Be sure to include this page's title in the subject line. Also, your corrections, updates, additions and suggestions are welcomed. Please submit them via email To: EditorEverythingAboutBoats.org (Replace "" with "@"). It has been truly amazing to see what we have been able to accomplished when we've worked together. Thanks to all those that have donated their valuable time and energy, and a special THANK YOU to all that have supported this cause with their membership donations."

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