Keel Trunk Fillet Reinforcement

Review of the important reinforcement to the keel Trunk





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What new?

We just returned from a great Chicago Boat Show and New England Boat Show in Boston.

On the way back from the show we stopped in at Paragon Products the pick up the first US production run of CR-914 Black  trees.



Keel Trunk Fillet


(This is very important)

With the addition of a mast compression post the need for a keel trunk fillet is an important feature that needs to be added to the hull. This spreads the load from the rig thru to the hull over a greater area. Failure to install this fillet may result in a stress crack at the forward edge of the trunk.


This photo is an example of the minimum fillet I would recommend
(Keel tube has been removed for clarity)



  • Clean the hull and trunk area with a solvent (Alcohol is fine) to remove any oil.

  • Thoroughly sand the area around the trunk and the trunk sides.

  • Remove the dust and clean the area again with Alcohol.

  • The Keel tube and compression post should be installed with CA.

  • Assemble and trial fit the radio board using the modification see Radio Board 3/8" aft of the keel tube.

  • Mark the location of the wood cross beam, clean and sand the marked areas.

  • Remark the radio board location again and prepare for the epoxy.

Epoxy Operation

  • Work steadily and smoothly this must be all done before the epoxy begins to set up.

  • Mix the West system and micro-balloons to a thick "Peanut butter" like consistency.

  • Apply thickened epoxy to bulb fin slot then assemble ballast and keel fin.

  • Apply thickened epoxy to the keel trunk as shown above.

  • Apply epoxy to the locations for the cross beams and install the radio board. smooth the epoxy to create fillets from the beam to hull.


I know, your thinking "I have to do all of that, all at the same time". Well it is a bit to do, but if you plan what you are going to do and in the order you are going to do it, you should not really have a problem. Work steadily and smoothly.

Now read this again and go over the "Instructions" #3 and 4.

Get everything ready, rehearse the steps and lets mix some epoxy.