Forums: Whisstock Designs: Some questions on design 074 New Topic Post Reply
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KimSails
Posted: Jan 13th, 2010 at 16:05   |   Subject: Some questions on design 074
Hi, George. I have been knocking around wooden boat sites for quite a while and I can’t believe that I missed your designs. They are eye-candy! I am interested in learning more about your design 074 19’ 2-berth sloop, so I hope you won’t mind a few questions.

Am I correct that I am looking at a gunter-rigged mainsail in the drawing? It also looks like the mast is connected to a tabernacle? (I didn’t see that mentioned in the description.) I know there are quite a few ways to design the connection between the main and the yard, as well as the way the sail connects to them. Can you give me a few more details on your design? Have the previous builders been satisfied with this rig? Is there any accommodation in your plans for carrying the mast/yard/boom horizontally when trailering?

I really like the built-in well for the outboard. It looks like the outboard can’t tilt and stays in the down position in the well. I am guessing that most builders just leave it there, even if there is storage in the cockpit seats since a 6-10 hp is no lightweight. Is there any problem with turbulence or drag from the outboard remaining in the water ahead of the rudder under sail?

Have you re-designed the open cockpit seats into lockers in the current design plans? What is the headroom in the cabin?

Is the DXF pack for this design available? How much does it cost? Is it also downloaded? BTW, I think this is a great idea!!

Thanks for any additional information you can provide. I’ll look forward to hearing from you.

Kim
debenriver
Posted: Jan 16th, 2010 at 01:31   |   Subject: Design 074
Hi Kim

I'm happy that you like my designs! Music to the ears of any designer.

You are correct – the rig is gunter and the mast steps in a tabernacle. I guess I ought to make that clearer on the description etc. The mast could also be keel stepped without too much problem.

The main boom connects to the mast with a purpose-designed gooseneck fitting, the drawings for which are included in the design pack. This will need to be made by a metal fabrication firm -- or if you have the necessary equipment/skill, you can make it yourself. Alternatively, there are a number of classic yacht equipment suppliers who would be able to supply a similar gooseneck off-the-shelf which would do equally well. Send them the drawing and they should be able to select a suitable item. In the UK, Classic Marine, in Woodbridge, Suffolk make pretty nice stuff.

The yard also connects to the mast with a sliding gooseneck: there is a leather-lined metal 'shoe' which sits on the mast (with parrell beads around the fore side of the mast). This has an articulated gooseneck fitting and straps on to the yard. As with the boom gooseneck, drawings for this are included for fabrication etc.

The rig has proved very satisfactory –– there have been lots of requests to change/add all sorts of things on the boat (most of which have been incorporated into the design over time) but never the rig!

It would be very easy to make a cross-gallows to sit in the cockpit; then the spars would store horizontally when trailering. I haven't actually produced a plan for this, but I would be happy to add it.

You are correct – the outboard can only remain vertical in the outboard well and I'm pretty sure no-one lifts it out except at the end of the season for service. Actually the turbulence from the outboard is quite small - really no more that a propeller on a P-bracket or similar. However, the outboard well itself does produce turbulence and this can be minimized by fitting a pair of neoprene flaps at the bottom of the well. The outboard pushes through the flaps OK and they sort of mould around it. But they do prevent water flowing into the well and hitting the back end of it. A bit like it is more aerodynamically sound to drive a car with the windows closed than it is with them open, because there is nowhere for the air flow to go once it enters the car.

Headroom in the saloon goes from about 1150mm (45") to 1050mm (41"). That is on the centreline. It decreases as you move outboard because of the coachroof camber. Even with all the design changes, it really is still more of a cuddy than anything else. You get decent sitting headroom however.

I haven't made the cockpit alternative lockers yet (I am, regretfully, a somewhat slow designer), but they will come. Same with the DXF packs -- they will come. Most are easy to do actually; the work is all in the lapstrake planking DXF files because they have to be developed to render the curved shapes on to a flat piece of ply. I just need a quiet weekend sometime ...... They won't be very expensive and they will be downloadable.

As a matter of interest, I am currently completing Design 152; a new 23' cat-rig yawl for an Australian builder and this boat is almost entirely built from DXF flies, with all the parts being laser cut from pre-epoxied ply. That includes structure and furniture, which will be pre-assembled before the hull is skinned. There is a lot of work in getting the full-size drawings of every little bit of the boat and all the components; and it's a little scary for the designer (me!) because the parts will all be cut and assembled without any further checks. But the discipline of thinking every part through to see how it can best be made and best perform its function and fit with all the other parts, is fascinating. And it is very very much a two-way process with the builder.

I hope this all helps.

Best

George

KimSails
Posted: Jan 16th, 2010 at 17:01   |   Subject: Design 074
Hi, George. Thanks for all of the detail you provided. It helps me to better visualize the boat.

I trailer-sail 100% of the time so I am happy that a cross-gallows is easy to add. The cuddy cabin is actually more attractive to me than a larger one. I like the cuddy for occasional shelter and privacy but I daysail 98% of the time so more room in the cockpit is a big plus.

I think I would need the cockpit locker alternative because there are some things (like anchors/chain/rode) that are better retrieved from a cockpit locker than having to drag them out of storage in the cuddy. Having DXF files is thrilling to me because it allows me to avoid the cutting of expensive ply -- which I don't do very well! So I hope we will be able to keep in touch about when the cockpit locker alternative and DXF files become available. When that happens, I will definitely be downloading. This would be a great boat for me!!

Thanks, again.

Kim
debenriver
Posted: Jan 22nd, 2010 at 15:20   |   Subject: Design 074
I will keep you posted! Both on the cockpit lockers and the DXF files. Lockers will come quite soon I hope, because that is not too complicated a job.