Built a flat table on Tuesday, 3 of us had the beams built by Friday afternoon. They are't perfect as some of the ideas didn't scale up the way i thought they would, but they should do the job. The following week, we built the 3 x 6m sections of telescoping mast. Round within a mm or 2 and straight.
These methods should make it a lot easier for amateurs to build their own masts. We did not infuse them as infusing carbon when you cannot see it is potentially more expensive than I can afford, but using long outlife resin, it was not too fraught.
Beams and masts need reinforcing added (this could have been included in the build, but I was a little wary of trying too much at one time), which I will add this week, then test them by hanging loads off them and measuring deflection. This does not prove their strength (this would require breaking them), but does prove their stiffness, from which the strength can be extrapolated.
The weights of the tubes are:
Beam 1: 28.2 kgs
Beam 2 28.7 kgs This one has a bit of a stick up with the internal bleeder. Going to need a long chisel to get it out
Bottom mast: 14,1 kgs
Mid mast:11.3 kgs
Top mast 10.9 kgs
The extra reinforcing and bulkheads will add a couple of kgs to each piece. Should end up about 30 kgs per beam ( a little heavier than estimated and 40 kgs for the mast, which will be 16.7m long when fully extended and is a fair bit lighter than anticipated. There is room to add more uni if required. This is a little shorter than originally designed, but it is not a big deal to add another section (either to the top or bottom, depending on stiffness) if required.
Once the beams are reinforced and tested, I can build the rudder mounts, then start assembly.
I have also made a model rig which the sailmaker is building a sail for so we can check out the non track options for attaching the sail to the mast.
photos of the tubes on the build blog and facebook in the next day or so.
On Tue, Oct 25, 2016 at 3:29 PM, Rob Denney <harryproa@gmail.com> wrote:
Bucket List is back on track. I am working local company Multi Marine to get it finished, starting on Monday with the beams using a technique which requires neither moulds not mandrels. Then the mast, which will be 4 x 6m lengths which telescope. Partly to see if it is possible to make a telescoping rig, partly as a one, or even 2 piece mast of this length is a challenge in terms of space and ability. The telescoping mast will have a wishbone boom (already built) which will be tied to the stub mast, also built. The bottom of the mast will be tied to the deck so it can rake fore and aft and also cant sideways. This is unlikely to be the configuration for the charter boat (although the telescoping might be), but should be fun to play with.Then the lee hull arrives from Adelaide and once the beams are built, we will fit the rudder mountings and the hull sockets. Once the.mast is built, the sailmaker can start on the sails. then it is all the little stuff like the tramp, deck and mast fittings (not many of these), tillers and extensions to fit.No idea when it will be finished, but at least it is moving again.In other news, there is a partial backer for the 4 boats in a container for charter anywhere in the world idea, so this is also moving ahead. There have also been some pretty serious enquiries for a couple of power cats, a power proa and a couple of interesting variations on the sailing harry. Fun (but busy) times.rob
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Posted by: Rob Denney <harryproa@gmail.com>
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