Sail Trim Clinic

Lifetime access
Rating is 4.80 (based on 1363 reviews).


Captain Ed Mapes with Grant Headifen

In this Sail Trim Course you will learn

  • How does the trim of the boat change when the crew moves forward?
  • When the upper leeward telltales are fluttering but the lower ones are flowing smoothly, what should you do?
  • When should you move the jib fairlead forward and how much?
  • Why does an inch on the main outhaul make such a difference?
  • What are 5 ways to lessen the weather helm effect?
  • How to hoist, douse, and trim a spinnaker

We guarantee both your satisfaction AND Lifetime access to any sailing course you buy from us

More about this Sail Trim Course

  • View an excerpt from this Course
  • Simple concepts for real understanding
  • This Course takes approximately 4 hours of total time to complete
  • Take as long as you need to complete
  • Return as many times as you like to review
  • Take the online test as many times as you like
  • Adds the Sail Trim Endorsement to your Sailing Certificate
This is an ONLINE course and test viewable in your browser window. 
Today's Investment: $39 (or $33 with the Captain's License Rank Bundle of sailing courses)
Not convinced yet that online sailing courses are cool? Visit our fully interactive and completely free Sailing Course. You'll see why online e-learning is SO MUCH BETTER than a boring old Book.

You will receive access to our interactive online sailing lesson, plus a downloadable PDF document of the entire course for optional offline reading and the real-time graded test. This Sail Trim Clinic is a MUST for semi-experienced to experienced sailors. It is about the TRUE ART OF SAILING and the FINESSE. It is very technical and the test is difficult. Pass it the first time and we'll be impressed.

This course will take about 4 hours to complete including the test. If you really want to get the most out of sailing then this clinic is well worth the $39 investment in creating more exhilaration on your boat. Like all NauticEd sailing courses, you can revisit to brush up as many times as you like for life for FREE.

The author, Captain Ed Mapes is one of the best. He conducts seminars in most of the sailing boat shows throughout the United States. His informative articles can often be seen in many of the major sailing magazines. Captain Mapes is the owner of Voyager Ocean Passages where students take extended ocean passages and learn first hand the real art of sailing. In this clinic, you'll learn the finer points to sail trim. The first time out after taking this Sail Trim Clinic you'll realize that your $39 was invested well. So don't touch that mainsheet yet, the traveler might be the best adjustment.

Having a properly trimmed and balanced boat gives the sailor a feeling of mastery and a quiet sense of inner peace. Please enjoy Captain Ed Mapes' Sail Trim Clinic.

Register  for this course now, get more out of your boat, get more out of sailing and enjoy life - all for just $39. With thousands of excited NauticEd Students, we can't imagine why, but if you did not receive $39 in value from this course then contact us and we'll happily refund your investment.

If you still have questions about NauticEd, the courses and/or the sailing certifications, just contact us via email or phone we're happy to help. Otherwise, let's get started with the registering for this course now!

View Sail Trim Course excerpt

Student Reviews

Phil K.
2022, 06 Mar. 23:42

Great illustrations and well explained

Lucas v.
2022, 15 Feb. 22:34

Great update on techniques

Michael S.
2022, 10 Feb. 01:35


Yosh H.
2021, 28 Dec. 06:37

I like the diagrams and videos and anecdotes

Alex H.
2021, 25 Dec. 18:59

Learned how to better use traveler and main sheet

Showing last 5 reviews.
List Price: $39.00

Excerpt from the course

Expand Excerpt from the course

So far, we’ve hoisted the jib, adjusted halyard tension, and trimmed the sheet so that telltales at the bottom and middle sections stream back well.  Now it’s time to compare telltales from bottom to top.  Inequalities are corrected by adjusting the jib fairlead position.

jib too far open

Figure 3a: The jib fairlead is positioned too far aft, opening the upper leech and spilling air out.  The upper telltale flutters forward because wind is choked off from that part of the sail. This is corrected by moving the fairlead forward

Figure 3a illustrates a sail with its lead too far aft, with the upper sail presented to the wind at too broad an angle.  Insufficient airflow and turbulence causes the upper windward (red) jib telltale to dance forward while the middle and lowers stream back nicely.  The leech is allowed to open up and air spills out of the sail aloft.  The loss of air pressure decreases left and drive, slowing the boat down. 

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Collapse Excerpt from the course

Sea talk testimonials

We are really enjoying this new format for learning to sail. Using NauticEd study at home at your own pace basic knowledge then the two day practical sailing course is perfect for us. Now I’m going to go back and re-study the areas which I need more review. Thank you for creating such a wonderful tool.

Martha S, Student - Oregon

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