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Re: Intro


 

Hello Mr. H.&.M. and other contributors to this issue


Here we go again. I belief have read my answer to Andrew. Which answers also some of your questions in this letter.

Coming first back to weights. The rig as shown will weight in including sails and rigging 135 kg (Dynema stays). My wishbone gaff rig weights about 145 kg. This extra weight is in the furler on the yackstay and the wishbone. We used a similar rig later on our Pelican. Unfurling the sail about 10 seconds, furling the sail about 20 seconds including setting the inducing setting of the topping lift.. You can not do it faster with a junk rig. Windward angle without pinching but some speed decrease 35 degree, optimum with better speed 40 degree.

By the way, you need only Aluminum tubes for the mast, which is a big money saver. The wishbone is a material mix from stainless steel and Aluminum. When you can weld stainless steel then it is good to do. When I look at most of the junk rig with all the ropes I have some taut about running resistance and the mast on the wrong side. If I would use a junk rig then the simple Jester rig. When you look for instance on all the different sail and other modification at many of the junk rigs including the extreme low aspect ratio junk rig on the ORYX with all the experience Peter has starting with the "Batcher" I see no reason to use it. This includes the Tyler Aerorig. When I calculate the time to build all the wishbones it would be a no-no for my. I am not this patient. Costs is an other factor. Besides a simple junk rig like on the Jester the are more expensive as any sloop rig. But at the end it is up to you. The only cheap and good working wing sail junk was the boat of my friend I was showing the photo yesterday. The only two photos I have are also in the photo folder. The boat was so easy to handle that his engine was a big junk of roost. One day he sailed into the old Denia port at wind force 7 to 8. His cockpit still closed. At the last moment he opened the cockpit rounded of to his his mooring and let down the rest of his sails. He was not a special kind person, but a gifted designer builder and sailor. He was known on the coast as "Ken on the rocks". A pity, I made only some sketches of his super simple wing rips which I lost somehow. General, the forward part was a wing section with a big flap. So far to the rig. ?So far to the rig. By the way this is not means to convert you. So to see you are a junk addict and why not. This was long, next only short answers.

Coming back to weight. First a strange thing, catamarans need more heavy ground tackles. For this boat say a Bruce anchor of 20 lb (10kg)and a 3/5 chain, length 60ft 24 kg. Rope 14mm 100m 18 kg. Also together 52kg The second anchor gear 2/3 also 34 kg together 86 kg.

Rigging my Wishbone rig mast AL tubes different diameters 140mm lower part 130mm upper part 57 kg + Wishbone gaff complete 6 kg. Furler without profile 6 kg weight total 95 kg (compare to junk rig, significantly less). Water 80litres. Katadyne 35 electric 15 kg. Fenders and other deck gear 28 kg. Engine 56kg. Solar panels+ wind generator Rutland 40 kg. Batteries (up to you if you use lithium of sufficient capacity about 18 kg)

Total with some tolerances 392 kg. Boat weight complete incl water = 1795 kg. Useful extra load till waterline

= 1058 kg. Minus the dinghy of course, but I am sure sufficient for food, clothing, navigation tools chard's books canary etc. will be sufficient for a route of 4000 mile at a speed of 6 knots = etmal 144 miles = 27,77 days.

With good planning the probability to run in a severe storm is 7% at the normal routes around the usual banana belt. When you sail outside this area the storm probability is 8%, These are meteorological data from the NOAA. For a good information of the weather conditions everywhere on the world is this link very helpful

Now again and at last. There where many trips made around the world with small catamarans (or monos). But lets stay with the catamarans. Go to the web pages of Emmnuel an Maximilien Berque. The where sailing the Atlantic with a 6m Proa and a 6m catamaran. By the way with the proa without sextant and chards. It is an attitude. For all the other arguments from distriputors to this thema, many thanks. All are right in there views, but it must not be my view or from others. In any case interesting. One needs a palay an other only a tent.

At last to this issue, good seamanship is the crucial factor, you can loosen your boat more easy on a coast as on the sea. Per my own mistake we where in a winter mistral (December 1990) 8 miles out the coast. Not far, but it was more safe to went out to the sea. Winter mistrals are more sever (about force 10 with a temperature of 8 degree, also very tense air). No problem, we streamed in a bend 160m 16mm rope out with a tire. 4m2 storm jib, Full control over the boat all the time. It was so easy that my wife was even cooking (by the way, cooking would be impossible on a mono).

Short back to the KD 860. The plans now sold for many years and I picked up some ideas which I have adapted in the plans, like the forward windows, a center/dagger board which folds completely back and can not damage the boat and the Whisbone rig (not included in the standard plans set, but can be separate ordered). I think this is sufficient to close the discussion regarding this issue.

?

Bernd?


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