punchy

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About punchy

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  • Birthday 10/01/1980

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  1. punchy

    Moth Developement

    Getting spare parts for a mach2 is just a case of going to the webshop and ordering. Its usually on its way the next day. Or build your own bits.
  2. punchy

    Does your dinghy have a name?

    The West Aussie moth fleet have a tradition to rename boats if someone forgets to sign on or is late for a regatta. recent 'family friendly' names include "im a little teapot", "lord farquart", "fluffy pillows", and "the mobility scooter".
  3. punchy

    Moth Developement

    Its just internal linkages, nothing complicated but pretty fiddly. Furuya-San had made the whole foil as one piece and then put an opening at the bottom to allow you to connect it all up.
  4. punchy

    Moth Developement

    So I actually put together an electronic control system for a moth, but decided that with current technology its benefits were limited so never installed it. My reasoning is Although sensors can pick up the level in 100ms or less, the speed of response of the actuator was limited. A 6V actuator was responding at about 3s full range which is substantially less than the speed of response when using a wand. Faster actuators were possible but with a substantial power demand impact The actuators required significant power demand, and when you consider the time required for a 4 race day plus some maneuvering time, resulted in a very hefty battery pack, the size of which was impacted by the speed response of the actuator - so either a large amount of weight(several kg), or a battery pack that may mean you do not finish a race or 2. As Rob said, the maximum benefit of electronic control would require complete knowledge of the boats situation, and to do that would require a large number of sensors, and failure of any $1.50 sensor could put paid to a whole race and then cause hours of faultfinding work. So in anything other than butter smooth conditions where response time dynamic impacts are minimised, the wand still offers the best overall response. Strictly speaking, electronic control has two potential benefits. Offset compensation from your target ride height, which is done by the standard ride height adjuster on every modern moth, and The ability to move away from the standard sine/cosine control dynamic function that all the existing linkages are dependent on, however with the advert of cam control this has also been resolved without the use of electronics. The use of cam control now means that the dynamic response can be changed for at most the cost of $1 worth of plastic and a phone conversation, rather than a process control degree, and plastic does not have an issue if it gets wet. Personally I would love to play with electronic control, but I don't see it offering any real benefit for the moth class in terms of competitive development as yet. For the record, I have now bolted on a cam system and wouldn't go back. For those questioning the cost of the electronic system, in terms of components, it was comparable in cost to a full standard wand installation. But probably alot less reliable. But to go on with your idea of development, I think the Furuya-San Foil design shown at Japan to be a potential significant step forward. No exposed push rod, interference drag of the main foil minimised even further. I would love to see this concept explored further. As always with he moth class, the step forward will come from an angle you do not expect. I can't wait to see what good idea someone comes up with next.
  5. punchy

    Foiling Moth Setup

    I will be, its just the unwillingness to sacrifice the small amount of boat time I have to put it on rather than go sailing.
  6. punchy

    Foiling Moth Setup

    Ah that fateful moment when your wand comes clear of the water, the bow is nose up and you start looking for exit paths. I seem to suspect there may be a slight issue with the RHA there... GPT, there are a few who make the cams style control, and yep that is one of them, but there are a few out there. Best bet is to ask your local moth fleets
  7. punchy

    Foiling Moth Setup

    GPT, the thing to remember is the various controls interact. Variable and length effects gearing, Ride Height Adjustment just manages the offset from the targeted ride height for varying conditions but you have to be careful to not try and overextend everything when you fall off the foils or things will just bend. One recent development that is potentially making things alot simpler is the cam control system, which if you accept some of the hype means that you can throw away most of your controls. The cam then compensates for your ride height in a way that linkages can not. The rudder control and wand length control are still important, even with cam control. but there are less variables that can interact negatively.
  8. punchy

    WTF Australia

    Its the snake eating spider that scares the sh*t out of me.