Moonduster

Members
  • Content Count

    4,878
  • Joined

  • Last visited

Community Reputation

309 F'n Saint

2 Followers

About Moonduster

  • Rank
    Super Anarchist

Contact Methods

  • Website URL
    http://
  • ICQ
    0

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Moonduster

    Cutter Rig Going Wing N Wing

    You're resisting it's forward motion and dragging the boat along with you. Your arm is in tension. Your muscles are tensed in the same fashion as when carrying a heavy weight - to keep the load off your joints.
  2. Moonduster

    Cutter Rig Going Wing N Wing

    When you are acting as a human guy are you generally pushing the sheet out, or pulling it in? (and if you are pulling in why?) You're pulling it in and your arm is in tensions. The guy is the most heavily loaded piece of running rigging on the boat and like the pole it's in enormous tension. The only thing compressing the pole is the foreguy. If you cut the guy, the tack of the kite (clew at the pole) will move forward. The whole damned affair is pulling the boat forward. The load on the pole is forward, not aft.
  3. Moonduster

    Showtime capsize on return trip

    There's plenty of money ...
  4. Moonduster

    Showtime capsize on return trip

    It is no coincidence pathetic that the VO70 rule required solid steel fin structures with no welds and the VO65 and IMOCA OD fins are forged and milled with no welds. That the VOR went one-design and the IMOCA went one-design on masts and keels is even more pathetic. These were/are the top development classes in the sport. Some development. Some sport.
  5. Moonduster

    Cutter Rig Going Wing N Wing

    NO spinnaker poles are not typically in tension. So when you spike the guy at the end of the pole, the kite hits you in the face? I think not. The force on all three corners of a kite are away from the boat in the general direction of down wind. Now, if you grind the living piss out of the foreguy, you might compress the pole - but that's not a load from the kite. thinking this through there may be some cases Keep thinking, it's highly encouraged.
  6. Moonduster

    Cutter Rig Going Wing N Wing

    Dude, trust me, you'll be gybing. And that staysail poled out isn't going to do any good at all. Just one more thing to chafe to death. Save it for when you're reaching in 40+. Consider two jibs sewn together at the luff hoisted on your headstay for deep two-pole reaching. And remember, those poles will be in compression when sailing with poled out jibs. Those rings at the mast and the mast itself will take a beating like nothing you can imagine. Most spinnaker pole hardware is designed to be in tension, which is what you get from a kite. You need to talk to a rigger who understands that difference.
  7. Moonduster

    Solar panel output simplified??

    But your battery voltage won't be 12V. Hopefully closer to 13.5. So the current takes a pretty big hit, maybe 12.6A instantaneous in idealized conditions. I'd plan on 10A max for daylight hours / 4. So on a 12 hour day, you'll get 30AH.
  8. Flying 15s and beach cats. One was 50 to 100m from the beach. Oh no! Only in Australia. No story here. Move along.
  9. Moonduster

    Cutter Rig Going Wing N Wing

    Trust me, you're not in the GGR, although you may be planning on it. But if you're asking this question here, perhaps it's time to reconsider. Same length. As long as possible such that they can be gybed without removing from the mast. Offshore jaws; bring spares. Don't scrimp on deck chocks. Consider a pair of poles with nesting diameters that allow either to be used as a splice for the other. Don't forget hacksaw blades and a pop rivet gun.
  10. Moonduster

    "Helicopter" or "Millionaire's" Tape

    Millionaire's tape is PTFE. I see no indication that the "Leading Edge Tape" is PTFE, there's no actual specification that I can find anywhere and the price suggests it's not PTFE. You can find black PTFE tape here.
  11. Moonduster

    Showtime capsize on return trip

    The Showtime incident is surely not due to lack of maintenance as it was a new keel, ie 12 months old? Not apparent without understanding the design point and the construction. There are lots of programs with keel fins that require regular maintenance and inspection after every event. the engineering is guesstimation not tested to failure to create a standard, canting keels proved that This is total bullshit. The engineering is the engineering. It is based on an assumptions package and a design package. Done correctly, it delivers a solution within those assumptions for that design that works. Period. There is no guesstimation; it is applied math. To claim this is to demonstrate your complete ignorance of not only engineering, but science itself. Engineering a keel fin and its attachment is no different to any of 1000s of other engineering applications from bridges to buildings to sewers to space ships. None of these are ever tested to failure. Yes, there are occasional engineering mistakes. Far more often, on analysis of failures, the assumptions are proven to be short sighted. But the biggest source of failure is not recalling the design package - for example, launching a space shuttle in sub-freezing weather. And yet, one must have a design package and an assumption set. Your house has a roof with a design life and an assumption about live load due to snow. These are based on cost and climate and accepted standards of risk. One cannot engineer a roof with an infinite design life or an infinite load bearing ability. That someone chose a 25 year life and a 500 kg/m2 live load limit does not make the engineering behind that roof wrong should it begin to leak. More to the point, why do you think there's even a problem with keel design? As near as I can tell, 6259 yachts have started the Sydney Hobart. So between races and deliveries, there have been 12518 passages. I can't find any clear answers for keel failures, but let's say 5, which is 0.04% failure rate. That's pretty small for a race that many claim is the "holy grail" (you just can't make this shit up) of yacht racing. By comparison, in 1018 F1 races, 52 drivers have been killed. That's 5%. Now I understand you don't trust applied math, but this is simple statistics. The odds of being killed in an F1 race, historically, are 128 times greater than losing a keel fin in the Sydney Hobart. How much safer does elite high performance sailing actually need to be and at what cost?
  12. Moonduster

    Showtime capsize on return trip

    what forces that to be governed? IRC certificates require submission of proof of those design reviews for those yachts constructed after the date at which the requirement was introduced. I believe other handicapping formula have similar requirements. There are no as-built verifications as yet in vogue. Doing so would all but kill recreational yacht racing.
  13. Moonduster

    Showtime capsize on return trip

    I'm coming at this from an engineering point of view. Regular and correct inspections are good keel boat owner practice because surely they want to sleep at night...whether that is mandatory or not is another matter. Yeah, no. From an engineering point of view, the evidence is so, so, so clear that the overwhelming majority of boat-to-keel connections last as long as the yacht itself with zero maintenance; statistically, this is a non-issue. Anyone who says that regular inspections of keels will accomplish anything other than transferring money from yacht owners pockets to charlatans claiming to be qualified inspectors (as is the case with most seller's surveys) is delusional. Any such policy will have a substantially greater negative impact on the number of yachts racing than any positive impact on the safety of those that continue to race.
  14. Moonduster

    Showtime capsize on return trip

    It's possible that a review of the design and construction plans and also the post-construction NDT results might bring something to the fore. Anything else, even the claim that the fin broke, is so speculative as to be worthless without evidence in hand. Ideally, AS would ask World Sailing or perhaps the ATSB to lead any investigation as it doesn't seem that AS has the capability to do much of, well, anything.
  15. Moonduster

    VHF noise ONLY on CH 73 - Only with Instruments ON

    No, there are 1000s of those system sailing around the world without RFI-related issues. To figure out what's going on, disconnect the power wire on the Fastnet bus from your Hydra process so that all your Fastnet devices (mostly displays) loose power. If the problem persists, the problem is with your processor. If the problem goes away, then the problem is a Fastnet-connected device. To figure out which one, you can start to disconnect the power at the junction boxes and the middle and work from there towards the offending end.