Catamaran sailing; a quick look inside our 35' Wharram Tangaroa Mk4.
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- Опубліковано 29 кві 2012
- Sailing towards Broken Bay NSW in the Hawkesbury River. Like many owner built boats, its a work in progress....We have the basics working and can live aboard for a few weeks in relative comfort. The centerboard has made a huge improvement to the windward performance which was basically a joke before.
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Thanks for sharing, you have a nice catamaran.
I am really enjoying your videos and I am finding them very helpful. I am finishing a Tangaroa that was started in 1988 and I am the third person to own her. She is in the water and I am at the point where the mast is about to be raised. What height is your mast and how long is your boom? The mast i have is 38 ft and I have a 13 foot boom. I am thinking of going smaller because weight and cabin area ideas open up a bit with a smaller boom? Wondering what you think.
Dave Mundy Hi Dave,I needed as long a boom as I could get as my boat is over twice the weight of the standard dry Tangaroa at 6.3 tons as lifted into the water. It has a raised sheer line (deck height) +330 mm and an extended cabins. I wanted the extra sail area to help drive the extra weight through the water. It has worked out well and with the centerboard we really can get a satisfactory cruising performance. My mast is 35.4' and the boom is 14'. the mainsail is 30.2' x 13.9' with 5 x full length battens medium high roach to try and get the maximum sail area out of the rig. Our biggest jib is luff 33.6 x leech 20.8' x foot 11.2'. Our genoa has to go around the side of the boat so is not easy to tack. To date, used very little. We are very keen on using spinnakers and will often sail down wind with spinnaker only. The massive sail area compared to the main and jib really does make it go well down wind and we have had up to 15 knots surfing down waves. And putting up the spinnaker is easier that putting all three sails up, of course.
The other factor worth mentioning is the bimini. It is a kids trampoline frame.To have standing headroom in the cockpit we needed to have the boom higher up the mast which reduces sail luff length for a given mast length. The bimini allows shelter from sun and rain and really makes a big difference when living aboard as we often do. It is more like home when you can stay dry in the wet and get into the shade in hot weather. We love living on board and really do have all the comforts of home.
I hope that info helps in your project and look foeward to hearing more from you.
Kind regards Alan
Alan Barber Thanks Alan. That helps a lot. My Tabernacle is stressing me out. I worry that it isn't strong enough at the base. Does your mast rest on the tabernacle or float with pins through the sides of the tabernacle? Do you have two mast support lines to the rear or run one to a rear stay and branch off to the hulls? .I am trying to figure out the Bimini situation as well and worry about running in to these rear lines. My mast is 38 feet and my boom is only 12 feet 9". It is a furling boom off of a 30 C and C so even though my main is 37 feet and has a foot 2 feet larger than the boom i am going to role up the extra.I may get a larger boom later. How far back from the tabernacle did you mount your stays for the sides. are they perpendicular to the Centre of the mast or back a bit. and do you have cross tees on the mast. I like your Bimini. I am going to model mine similar to yours. My boom is mounted 7 and 1/2 feet high so i can have a pretty high Bimini with lots of room. What material is your canvas on the Bimini made of? Wow lots of questions. the more I think about it the more questions keep popping up. I really appreciate your input and I will try and post a video or two on youtube to show you my progress. Thanks again and look forward to talking more and watching your next video. Dave
Dave Mundy The mast sits on the no.2 beam (mostly) and a support up to the front beam. The mast sits on a piece of gal water pipe supported by a heavy ply tabernacle that I made out of 2" ply (approx) and allows me to raise or lower the mast using the boom as a cantilever. This area must be strong to accept massive down forces. My spreaders are copied from the plans and are not very long. I do have running back stays and occasionally will use them to stop the mast flopping around to much. The side stays are back approx 2'6" but I have to admit this is a guess. The side stays are adjustable because the boom hits them when running down wind. I like having them there as a bit of a back up and you can use them to keep the forestay tight if you are really keen, which I'm not most of the time.
The tarpaulins, one fore and aft and one across the Bimini, are basically reinforced poly and quite a good quality. They were cheap compared to Sunbrella or Herculite and have have lasted many years (approx 10+) but I will have to replace them soon. I bought the sheets from a canvas dealer who recommended it to me. I folded the edges twice and sewed them and put the eyes in the corners and along the sides.
I am happy to answer your questions and look forward to seeing your boat sailing. Alan
Alan Barber great idea about the galvanized pipe for the mast. I am going to move the tabernacle over the #2 beam. I was thinking that I should anyways and your comments validated that for me. I noticed the galvanized fencing for the tramps. Necessity is the mother of invention! I am going to borrow that idea. How is it to lay on? Posting a video soon. Dave