Merlin Rockets by Keith Callaghan
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The first 21st century Merlin Rocket designs - HAZARDOUS series:
Hazardous 140 and Hazardous 170 (2004)
Hazardous Zero-9 and Hazardous Zero-9 LITE (2008 to present)

Rob Holroyd and Joanna Marlow sailing Merlin Rocket 3708 "WICKED" - a Hazardous Zero-9 design
Photo copyright P Newton, Digital Images UK

Merlin Rocket Kits now available - Prices from £999.

In collaboration with JORDAN BOATS, the first HAZARDOUS ZERO-9 LITE Merlin Rocket kit of pre-cut plywood parts has now been produced. The basic kit comprises all the plywood parts necessary to build the boat (profiled to shape, but excluding the deck plywood), plus the building frames cut from MDF. More details.
The introductory price for this kit, including UK delivery and the licence to build one boat, is £999.

Click on an image below to enlarge.(These are orthogonal views, ie with no perspective)
Hazardous Zero-9. Copyright Keith Callaghan 2003, 2008. Click on image to enlarge Hazardous Zero-9. Copyright Keith Callaghan 2003, 2008. Click on image to enlarge
Hazardous Zero-9. Copyright Keith Callaghan 2003, 2008. Click on image to enlarge Hazardous Zero-9. Copyright Keith Callaghan 2003, 2008. Click on image to enlarge
Hazardous Zero-9. Copyright Keith Callaghan 2003, 2008. Click on image to enlarge

While the UK National Merlin Rocket dinghy class still thrives, design development has stagnated over the last decade. In fact, my new HAZARDOUS series are the first really new designs in the 21st century, and also probably the first Merlin Rockets to be designed with the aid of yacht design and CAD software. Whether they will match up to the Morrison NSM4 or the Holt Canterbury Tales remains to be seen. I have done a lot of research recently (via books and the internet) to appraise myself of the latest design thinking, and experimented with a radical new Merlin shape, but I could not produce a "Bethwaite skiff" type of hull within the constraints of the Merlin class rules, and which did not have excessive wetted area. So I went back to the Hexagon/Hysteria/Hazard line and produced a concept which has the same fine entry, but flatter garboards forward, and a radically flatter planing run, to take advantage of the power developed by the sophisticated modern rigs. The Hazardous 140 and 170 designs differ only in their weight carrying capability - the 140 is designed for a lighter crew (about 140kg, in fact), and has less curve in the aft run than the 170. Wetted surface area compares favourably with my earlier designs (they were good light weather performers). In a planing breeze I expect these boats to fly.

Hazardous Zero-9 Lite, layout plan - PDF file
Hazardous 140, main bulkhead construction - PDF file
Hazardous 140, shape of sheer plank - PDF file
Hazardous Zero-9 Lite, detail at station 1 - PDF file
Hazardous Zero-9 3D perspective view - PDF file

Plans for the first Hazardous 170 were sold to the USA, and the first Hazardous 140 has gone to France. On 16 June 2005 John Keeling launched his Merlin USA01, named 'Forty-two'. To view some photographs he has sent me Click here.

22 November 2008: Laurie Smart has been commissioned by Rob Holroyd to build a Hazardous 170 (with a few mods, and thus renamed Hazardous Zero-9). The boat was exhibited at the RYA Dinghy Show at Alexandra Palace on 7th-8th March 2009.

Zero-9 is designed to carry 7-10kg more weight that the Canterbury Tales, and with the centre of buoyancy set further aft, she will favour heavier helmsmen with lighter crews - often a typical Merlin crew combination. Wetted surface is about 1-3% less than Canterbury Tales, and hull draft is 16mm less. The waterline is finer to amidships, and wider towards the transom. Rob Holroyd has named his green machine "WICKED", and the owner, the builder and the designer now look forward to the launch (planned for end of April or even sooner) and subsequent sailing trials.

"WICKED" has been allocated MR sail number 3708. Registration of this Merlin means that I am the designer with (by far!) the longest career in the Merlin Rocket class - 43 years (1966 to 2009) - and counting! By comparison, Ian Proctor's designs spanned only 21 years, but they spanned a larger sail number range (2417 boats versus 1753). Phil Morrison's first design appeared in 1969, and his latest (hopefully not his last) in 1997. Ian Holt, the designer of nearly all the Merlins built in recent years, produced his first creation only 24 years ago.

And with "WICKED" Laurie Smart's career as a Merlin builder becomes the longest in the 63 year history of the Class - 37 years. I know I am biased, but in my opinion Laurie has produced a beautiful boat which is up there at the pinnacle of wooden dinghy craftsmanship. How many more Merlins like "WICKED" will be built, I wonder?

July 2009:

  • A Hazardous Zero-9 is being started in ITALY.
  • A version of the Zero-9 for lighter crews (unimaginatvely named Zero-9 LITE) has now been produced. The intended crew weight of this design matches that for the Canterbury Tales, but favours a helmsman who is a little heavier than the crew. A set of plans has already been sold to someone who intends to sail his boat on the Wannsee lakes in Berlin, GERMANY.

September 2009:

As the sailing season comes to a close, "WICKED" has not yet really been tested in competition. She appeared at Salcombe Week in July and with an inexperienced young crew beat about 20 of the standard Canterbury Tales designs (though more finished ahead of her!). Since then she has not been sailed due to Rob's other commitments. So for the Hazardous Zero-9 it is still "Case Unproven".

Hazardous Zero-9 - perspective view

See photos of the building in progress, below. - click on the picture to see a larger version.

Rob Holroyd, Keith Callaghan and Laurie Smart discuss Rob's new Merlin.(The boat shown is Steven Pollitt's Proctor MkXII, NOT the new Merlin!) Laurie Smart checks frame #3 on the Hazardous-zero9 Laurie Smart and Don Hearn
View of the frames View of the frames Don Hearn contemplates the H170-zero9 frames
Hazardous-zero9 frames from the bow Hazardous-zero9 2nd plank being laid up, 3 December 2008 Laurie Smart's latest creation, 29 December 2008
Hazardous-zero9, 29 December 2008 Hazardous-zero9, 29 December 2008 Keith Callaghan and Laurie Smart, 29 December 2008
Hazardous-zero9, 21 January 2009 Hazardous-zero9, 21 January 2009 Hazardous-zero9, 21 January 2009
Hazardous-zero9, 7 February 2009 Hazardous-zero9, 7 February 2009 Hazardous-zero9, 7 February 2009
Hazardous-zero9, 7 February 2009 Hazardous-zero9, 21 February 2009 Rob Holroyd's Hazardous-zero9 arrives at the Dinghy Show. Don Hearn holds the trailer.
Hazardous-zero9 at the RYA Dinghy Show, 7 March 2009 Hazardous-zero9 at the RYA Dinghy Show, 7 March 2009 Hazardous-zero9 at the RYA Dinghy Show, 7 March 2009
Hazardous-zero9 at the RYA Dinghy Show, 7 March 2009 Hazardous-zero9 at the RYA Dinghy Show, 7 March 2009 Hazardous-zero9 at the RYA Dinghy Show, 7 March 2009
Keith Callaghan and old rival Merlin designer Phil Morrison at the RYA Dinghy Show, 7 March 2009 WICKED, MR3708 at Laurie Smart's boatyard, 20 March 2009 WICKED, MR3708 at Laurie Smart's boatyard, 20 March 2009
WICKED being prepared for launching at Burghfield SC, 22 April 2009 Rob Holroyd and Joanna Marlow sailing Wicked at Salcombe Week, 2009. Rob Holroyd and Joanna Marlow sailing Wicked at Salcombe Week, 2009.

Photo copyright P Newton, Digital Images UK

Movie - LS at work Download movie of Laurie Smart at work on the building frames (6.4mb download size)
Movie - WICKED launching Download movie of WICKED sailing on her first outing (7.4mb download size)
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Last updated 30 January 2010