Sailing yachts

Harrison Butler Z4 Tonner

(REF: 29134)


  • Designer: T. Harrison Butler
  • Builder: Alfred Lockhart (Marine) Ltd
  • Year: 1938
  • Location: Devon
  • Length on deck: 22'
  • Beam: 7'
  • Draft: 4'
  • Tonnage: 4TM

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Full specification

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.

Refitted by the current owners in 2023 with a thorough refit, 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 keel bolt under the engine bed was replaced. This was made and galvanized for us by David Webster at Deep Blue Engineering.
  • The metal engine bed frame was removed, shot blasted, cold galvanized and given three coats of Zingatarfree.
  • While working on the hull we came across the previous sockets for beaching legs. We repaired these and have restored them. Legs need to be made.
  • On the deck the tabernacle was removed and re-galvanised and the four holding boats were renewed.
  • The stem protection strip that runs from deck to keel had rusted and this was removed and replaced with stainless 316 and re-fastened.
  • The stemhead fitting was cold galvanized and rebedded.
  • We inherited stanchions, pulpit and pushpit with the boat which some previous owner had made and which had subsequently been removed. We galvanized these and they have been 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. The Pacific Light is not part of the sale but it in first tests is seen to work well.
  • 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 and 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.
  • The filler cap to fuel tank had previously been leaking and this arrangement was changed and improved.
  • 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.
  • An improved VHF aerial was fitted to the mast with better wiring and stronger mount.
  • The boom was given the same treatment as the mast with fittings removed, galvanized and with 11 coats of varnish to the wood.


  • Carvel planked in larch all copper clench fastened to steam bent oak timbers.
  • Approximately 1/3 of the hull has been re-caulked.
  • Hood ends re-fastened in 2016.
  • Cast iron ballast keel fastened with iron bolts.  1 bolt drawn and replaced with a galvanised steel bolt in 2023.
  • Iron strap floors across the centreline painted in cold galvanise and finished with Zingatarfree.  All new stainless steel floor bolts in 2023.  Plank repairs done in way of floor bolts where necessary.
  • Galvanised ring frame in way of the mast, repaired with new stainless steel bottom brackets.
  • Straight laid T&G pine deck, overlaid with plywood and sheathed in glass cloth.
  • Small toe rail all round finished with a stain for easy maintenance.
  • Galvanised stanchions, pushpit and pulpit fitted in 2023 with dyneema guard lines.
  • Varnished teak coachroof coamings with a sheathed T&G coachroof deck.  Varnished teak grab rails.
  • Varnished teak forehatch.
  • Non-self draining cockpit with varnished teak coamings, thwarts and sole.  Lockers either side beneath the thwarts.
  • Transom hung rudder with tiller steering.  New galvanised rudder pintles in 2023.


  • Fractional Bermudan sloop rig on a deck stepped varnished spruce mast.
  • Mast was new in 2018 from Collars.  All fittings removed and mast re-varnished in 2023 with 11 coats of Epifanes.  Stepped in a galvanised tabernacle with new fastening bolts.
  • Slab reefing varnished wooden boom.
  • Stainless steel wire standing rigging new in 2007 to external galvanised chain plates and bronze rigging screws.
  • Standing backstay to a galvanised bumpkin, refurbished in 2023.
  • Jumper struts with upper stays to support the mast head.
  • All winches are non-self tailing Tufnell types.  Pair of mast winches, single boom reefing winch and pair of cockpit sheet winches.
  • Sails from Sanders Sails both in fair condition.  Jib with Wykeham Martin furling system.  Mainsail with battens.


  • Yanmar 1GM10 diesel fitted as a reconditioned engine in 2023.
  • New engine beds fitted in 2023 with the associated metal frame shot blasted and galvanised.
  • 30 litre stainless steel fuel tank under the aft deck.
  • 50 litre bladder water tank.
  • 2 x Numax 86ah 12 volt batteries for domestics and engine starting.  Charged from the engine alternator or a small regulated solar panel.
  • Vertical action bronze manual bilge pump and a Sahara 480gph auto electric bilge pump.


  • 2 berths with sitting headroom.
  • The interior of the boat has been stripped to bare wood and painted from bilge to deck head giving a crisp and smart feel.
  • All varnished teak joinery.
  • Steps down into the cabin with galley to port and chart area to port.
  • Galley has a 2 burner Taylors 028 paraffin stove.  Fold down flap to increase galley work surface area.  Galley Faucet connect to the bladder water tank.
  • Chart area is a small work station with a lifting lid to a locker beneath and a locker under the deckhead.  Electric switch panel on the bulkhead.
  • 2 single settee berths in the cabin, both are over 6’ in length with good width.
  • Central passageway going forward with lockers either side in the passage.
  • The forepeak has joinery for a sea toilet, although the heads has been removed.


  • Steering compass
  • B&G focus log and sounder
  • Bulkhead Mounted Barometer and Clock


  • Simpson Lawrence Horizon Electrical Anchor Windlass
  • 60M  Lofrans 8mm Grade 40 Calibrated Hot Dipped Galvanised Anchor Chain
  • CQR Anchor
  • Fenders
  • Warps


  • Taylors 028 Stove with Hanse Burner on LH Side
  • Taylors Pressurised  Fuel Tank for Paraffin
  • Kettle for Taylors Stove
  • Bunk and berth cushions


  • Cockpit cover
  • Main hatch cover
  • Forehatch cover
  • Anchor windlass cover
  • Boom Tent Cover for cockpit
  • Jib with Wykeham Martin Furling Gear
  • Mainsail and battens
  • Mainsail cover
  • 2 x mast winches
  • 1 x boom reefing winch
  • 2 x cockpit sheet winches


  • 4-man Valise Liferaft (out of service date)
  • Manual vertical action bronze bilge pump
  • Sahara 480GPH auto electric bilge pump

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These particulars have been prepared in good faith from information provided by the Vendors and are intended as a guide, Wooden Ships cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. The Purchaser should instruct his agent or surveyor to validate all details as necessary and satisfy himself with the condition of the vessel and its equipment.