Wooden Ships Comments on this Harrison Butler Z4 Tonner
Harrison butler Z4 tonner, designed by T. Harrison butler and built by Alfred Lockhart (Marine) Ltd of Brentford in 1938.
Thorough refit carried out in 2023 with further works by Simon Wood & Sons, Lymington in 2024 and 2026, full list of works below.
The Z4 is one of the well known designs of T. Harrison Butler, an amateur yacht designer and Opthalmic surgeon by profession, who produced some very fine, well mannered and capable yachts. The name is derived from the Thames Tonnage of the design, a measure of useable interior volume.
The boat has a comfortable cabin with 2 good sized single berths and ample sitting headroom. The compact galley with a Taylors stove is crisp and practical. The Forepeak has a heads compartment with sitting headroom under the forehatch.
A very smart and well presented example of the class with a detailed recent refit history and seemingly very much ready to go.
Length on deck 22’
Beam 7’
Draft 4’
Thames Tonnage 4TM
2023 refit list
The hull was carefully taken back to bare wood to remove many paint layers and after repairs the hull was primed with three coats of Epifanes Underwater Primer and two coats of Seajet Antifouling.
All the strap bolts were replaced and all the related plank areas were repaired.
Straps were cleaned in situ and cold galvanized and then protected with two coats of Zingatarfree. A system we’ve used elsewhere that seems to work well.
The iron keel was mechanically abraded to bare metal and coated with three coats of red lead paint, then antifouled.
Where the hull opened while drying, or where repairs had been carried out, the seams were cleaned and the areas re-caulked. About 1/3rd of the hull was re-caulked.
New engine beds were made and fitted. The metal engine bed frame was removed, shot blasted, cold galvanized and given three coats of Zingatarfree.
The keel bolt under the engine bed was replaced. This was made and galvanized for us by David Webster at Deep Blue Engineering.
Original beaching legs sockets in the hull were repaired and reinstated.
Tabernacle was removed and re-galvanised and the four holding boats were renewed.
The stem protection strip that runs from deck to keel replaced with stainless 316 and re-fastened. The stemhead fitting was cold galvanized and rebedded.
Pushpit, pulpit and stanchions galvanized and refitted with dyneema lifelines.
David Webster at Deep Blue re-built the boomkin which was found to be weakened by rust, and at the same time he fitted an attachment method for a Pacific Light self-steering.
David Webster at Deep Blue remade and galvanized the upper and middle rudder pintles and these were refitted to strengthened transom mounts.
The lower chain attachments for the boomkin were repaired and all the fastenings and chain replaced.
The fuel tank was removed, cleaned and fitted with an extra shut-off valve and proper breather pipe. The fuel tank was changed from hanging by a few screws to sitting on a new beam and then rigidly fixed. Fuel filler cap improved to stop leaks.
The central Ringframe was found to be weakened at the base by rust. The rusted area was cut out and repaired with a 316 stainless strut – also made by David Webster at Deep Blue.
A reconditioned engine was fitted after complete service to all systems.
The interior of the boat has been repainted from bilge to deck ceiling.
The relatively new Collars mast was stripped of fittings, which were regalvanised, and the mast given 11 coats of varnish. The boom was given the same treatment as the mast with fittings removed, galvanized and with 11 coats of varnish to the wood.
An improved VHF aerial was fitted to the mast with better wiring and stronger mount.
2024
The rudder was removed and the Gudgeon and Lower Pintle fabricated and bushed. The rudder was re-fitted, and coated with Primer, Undercoated and Top coated.
3 Keel bolts forward were removed and replaced.
Topsides partially stripped, re-caulked and painted with 2 coats epoxy Primer, 2 coats Epiphane undercoat and 3 coats Epiphane Topcoat.
Cove line re-established.
Pulpit, Pushpit and Stanchions removed. Deck made good.
Stern light re-mounted.
2 coats of antifoul Primer and 2 coats of Shogun antifouling applied .
2026
Sadolin coating on Toe rail removed and 4 coats of teak oil applied.
Seams re-caulked where needed. 2 coats of Epoxy Primer applied to topsides before 2 coats of Epiphane Undercoat and 3 coats of Hempel gloss.
Underwater surfaces re-caulked where necessary. 2 coats of Primer. 2 coats of Antifoul Primer and 2 coats of Shogun Antifoul applied.