Healing the Break by Daniel MacN

Healing the Break
by
Daniel MacNaughton

This article discusses why the old practice of sister framing was unsound engineering and results in lower strength than the original construction plus lower resale value for the boat. It discusses traditional frame replacement and laminated frame replacement and then explores a method of repairing broken frames in place in a manner that results, even in straight sections,in the same strength as unbroken wood, and in tight curves tends to be significantly stronger than the original construction without an increase in weight. We call this method the "Scotsman". The article is illustrated with a line drawing showing the stages of the process and with photos taken of a recent project. By the way this same type of technique is excellent for repairing planking butts, damaged planks, and holes where through hulls have been removed, etc.

This article discusses why frames break and why some of the "repair" techniques, such as "sister framing" is actually weaker than the original frame, which we already know wasn't strong enough.

We then go on to explain the theory and practice of a proper repair of a frame where complete replacement would not be cost effective. We call this repair a "Scotsman" because it will make a superior repair at so much lower cost that many vessels that would not be feasible to do a full strength repair on any other way will now be cost effective to restore to full strength and indeed full investment value.

We've done extensive tests on this and find that even when stressed to the breaking point you cannot find any indication that the repaired section or any portion next to it is more likely to break than a new unrepaired frame of the same dimensions.

We are proud to have contributed this to the collection of repair methods available to the industry and have noticed that it has now spread all over the world and is appearing in books and articles as the proper way to repair frames. (tm) $10.00

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