LionessRacing

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About LionessRacing

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    Super Anarchist

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  • Location
    Alameda
  • Interests
    club racing, navigation,

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  1. LionessRacing

    gyro autopilot compas heading

    Dude, you're the person who picked "1GHz" as significant. "Performance" in digital Semiconductors has always been Speed * Power product, the ECL logic of the 60's was really fast, and eventually high speed required fluid cooling in the IBM mainframes. Getting it to run in your pocket, or on an offshore power budget required a few jumps down the ITRS. I simply said any "CPU built in the last 10 yrs should be more than adequate to generate a control response at > 10 Hz (compared to human reaction time > 200msec) " And that's a sensible comment; if I have to stipulate that it's suitable for battery operation at low power consumption to you, which would seemingly be obvious in the context, I did above; as that seemed to escape you in your urge to be disagreeable. You continue to gloss over that fact that 3-D acceleration is used to correct the measured WA and WS to account for the mast's motion (pitching, rolling, not heel & rake, nor static boat trim) which causes the sensor at the mast head to be moved in the wind field, creating a spurious apparent wind component that would be cyclic in waves and a declining impulse due to gusts as the boat heeled to equilibrium. Correction for Trim & Heel are implicit the static calibration tables at various TWS & TWA that are done in the processing by the instrument's CPU before the AWA, TWA are let out onto the NMEA buss as well as heel correction of boat speed. I don't know the proprietary algorithms, but I did read the release notes: Autopilot: Advanced Mode ... will then allow access to the following advanced features for configuration: • Gust Response • TWS Response • Heel Compensation (Heel Compensation HEEL COMP The amount of applied Rudder Angle to counteract any heel induced broach)
  2. LionessRacing

    PHRF is not run by self-interested clowns

    the performance of "the fleet" is hard to observe if there's extreme variability in sailing conditions which are objectively observable, as well as variability in boat prep, sailing ability and tactical/strategic choices which may be more subjective. Appealing your rating when it takes you 5 extra boat lengths distance to tack/gybe and 10 to set/strike a sail is inappropriate, but the only way that can comprehended that is by the on the water observation. Then also if your particular boat in fact tacks slower and accelerates slower due to rig/hull you may particularly under perform in light winds. At 20,000 lbs and full length keel we are especially awkward at < 4 kts TWS, while the 2000 lb boats with fin keels can maneuver more adroitly. "It's supposed to be fun" remains valid
  3. LionessRacing

    PHRF is not run by self-interested clowns

    As the two that I know race their own boats have well established (> 20 yrs) production boats, I don't think that's an issue. I personally don't think there is any issue, people of integrity will do the right thing , the question I am raising is what would you do differently?
  4. LionessRacing

    PHRF is not run by self-interested clowns

    Well there's always the question of who's ox is getting gored... In NorCal : we have a pretty diverse committee where there are these members, who are generously donating their time: 4 Sailmakers (2 well known international brands, 1 local loft that represents an old school internationally known brand, 1 purely local) Disclosure: Have done business with 2/4 firms recently, personally, 1/4 as historically on East Coast. 2 currently active designers with local offices 1 professional sailor who set record passages all over the world as navigator and raced successfully > 40 yrs from dinghy's to campaigning a Cal 40 around SF. 1 amateur , (retired but does Access Database work) in his mid late 80's who sails a Merit 25 with an all female crew on Wednesday nights / occasional Sunday brunch races. He's from my YC, and we do have meetings at various marks as well as the bar... Within the scope of monthly meetings, they are doing a lot of work, especially when a bigger race such as the Pac Cup looms. Do boats designed by, or equipped by, or from clubs they belong to appear before them? Certainly; there's likely enough transparency on results, (though not fully on deliberations,) to keep it reasonable. Would more amateurs make it better, or just slow down deliberations by adding uninformed opinion? Is a "professional cabal" likely to devolve to insider vs outsider where buying your sails or hiring database/navigation/design services gives you a lobbying position? Who would better serve?
  5. LionessRacing

    Minimal Nav Systems for Coastal

    The amperage is very use dependent: With the Radar & forward sonar both displaying on the MFD with the Autopilot actively holding a TWA course in waves, and transmitting on VHF at 50% dutycycle probably 5-10 Amp average. Most of the times I would have all of that running, I'd (soon) have my engine on, as i was either maneuvering in traffic, or in bad visibility or an anchorage/narrow passage. Out sailing, where I just want to have the VHF in standby, and the wind, speed & depth sounder slaved to a small display, less than an Amp.
  6. LionessRacing

    PHRF is not run by self-interested clowns

    One means to minimize bitching would be to post an appeal of a rating to all of the competitors, and invite public scrutiny and comment, whether by the owner or interested bystander. Those who have legitimate issues will get their concerns heard and validated by consensus. The self promoters who whine for redress on their rating will be held to ridicule, especially if they present an emotional vs reasoned argument. The fee for posting the appeal could be refunded if approved, and donated to the end of year party kitty if denied.
  7. LionessRacing

    gyro autopilot compas heading

    Your grasp of semiconductor history may be accurate in general, but it's useless in specific: sure, there were 1 GHZ clock Server CPU's 18 yrs ago, most running well over 30 Watts, not exactly a power dissipation for the processor that was going to win market share in an offshore battery system. Low power "mobile" CPU have lagged behind typically, getting one that would run on less than 1 Watt, with onboard NVRAM is a bit harder than getting 1 GHz. (what would I know, it's just my industry...) A spec of 20 Mhz is adequate, finding somebody who would make a slow processor for a small market (before smart phones, not as easy.) As regards 9 axis, the pitch and roll are already in the TWS, TWS corrections for masthead..
  8. LionessRacing

    gyro autopilot compas heading

    Derivatives of the output in feedback for the P-I-D loop are classic, feeding forward derivatives of the inputs is a more modern technique; "fast" is a relative term, depending on the amount of digital filtering and signal processing, any CPU built in the last 10 yrs should be more than adequate to generate a control response at > 10 Hz (compared to human reaction time > 200msec) What the Vendors are doing in their algorithms is proprietary; you can presume that since higher end instruments use the "9 axis" or similar MEMS "3D Motion" sensors to clean up the masthead motion for TWS/TWA calculations, they are built in to some extent. Do the pilots make use of hull motion; "trim angle" and derivative "Pitch" to sense waves, and "heel" and "roll rate" as well as TWS for gusts and generate the compensation outputs before yaw ? Good question, if they don't they should be, and the "training" that is done for commissioning at least addresses rate of yaw vs control input
  9. LionessRacing

    PHRF is not run by self-interested clowns

    Joe Wednesday in my limited experience tends to be pretty consistent about racing on the de Nile river.
  10. LionessRacing

    gyro autopilot compas heading

    Control system theory will tell you that the more gain in the system the less stable it may be to perturbations. Then again a rock is stable, but not going very fast. Putting in multi axis sensors for yaw, pitch, roll and their derivatives, and monitoring wind & boat speed gives the pilot the equivalent of “seat of the pants” feel. It won’t give it anticipation to hear/see the unusual wave. The software to interpret the rock and roll in a puff vs surge from a wave needs a fast processor and a high output actuator. Your high end pilots provide the sensing and computing, you need an actuator that can keep up, and the electrical capacity to sustain it. B&G just updated their H5000 Pilot. Release notes are here summary is “ B&G is pleased to announce the arrival of the latest software suite for the H5000 Pilot system. The latest software package provides multiple new features, enhancements and fixes for field issues reported by users, customers and Navico’s internal SQA teams. Following the success of the last Vendee Globe race, the H5000 Pilot Computer has been enhanced by the addition of failsafe sources and allowing the following variables to be outputted to the displays and for logging, giving the advanced user the ability to monitor and analyse individual elements of the Pilot setup. Active Perf Mode Gust Bear Away TWS Bear Away Heel Compensation Pilot Net Course Pilot Target Wind Angle Pilot Weather Helm Pilot Mean Heel ” key attribute is are your data sources robust and calibrated ? Note the failsafe features for loss of speed etc.
  11. LionessRacing

    PHRF is not run by self-interested clowns

    If you can think of a more thankless inside, non physical job than serving on a committee for any aspect of a rich man's sport, let me know. If the committee did a perfect job of rating all the boats, for all the conditions, so that the only differences were: Boat preparation Sail quality Sailor quality Skipper quality They'd still be abused because those that didn't prepare and achieve parity would bitch.
  12. LionessRacing

    PHRF is not run by self-interested clowns

    We race non Spinnaker except for the annual Octoberfest FUN race where we use ALL of the halyards on ALL of the masts to get extra "rating" credit for most sails flown concurrently, otherwise takes too many crew to be worthwhile. (Other rating credits for that one include Lederhosen, dirndls, gratuitous flashing etc. ) I know about the 15 sec "cruising credit", because I used to race out of Portsmouth, NH and did the Monhegan, Corinthian 200, Figawi, PHRF NE's etc. That being said, PHRF NORCAL states that they don't think its feasible to combine w/ & w/o and they are the local governing body who set the ratings etc. As an aside: we will be experimenting, and if successful will be changing our rating to shove the 1962 spinnaker pole 5' out in front as a sprit, and take 3x 10% of J penalty for an over-length pole on a non spinnaker boat, and fly the ancient 180% light genoa as our downwind/Code Zero equivalent. Previewed that with the committee, and had a positive determination on the rating impact... I suspect that there's a few members who have a sense of humor. We raced off Berkeley pier 12/1 and with only 155% Genoa, Main and Mizzen beat everyone out there on a W/L except the Melges 24 under PHRF TOT. (Nailing the start, and getting the 20 Degree Right hand shift to being nearly able to lay the rhumbline with 15 kts TWS helped a lot.) But as you will notice we are a fleet of 1, so we were also concurrently DFL, and having FUN while we do it.
  13. LionessRacing

    Minimal Nav Systems for Coastal

    For what it's worth, if you want to have integrated bottom plots...we have a "TotalScan" transducer hanging on a gymbal off the stern, going to a "sonar hub" displayed on the MFD which gives sidescan as well as variable frequency (depth profiles) and "chirp""fishfinder" images. You can collect the depth profiles and integrate with the chart for personal cartography where it would matter. paired with the look ahead forward scan it's quite powerful to image bottom obstructions, and get a sense of the density of the strata by the reflections.
  14. LionessRacing

    Minimal Nav Systems for Coastal

    For coastal including shorthanded overnight passages and inland waterways ranked in order of "must have" Cellular phone: because you probably will have one anyway, preferably with a booster and mast mounted antenna to get sensible range. VHFs: because you need one to call the damn bridges, arrange dock spaces, talk to the coast guard etc AIS receiving DSC equipped VHF, preferably with remote handset, because you really should have one where your MMSI can be automatically sent/received Handheld DSC equipped VHF because you should have a backup, to use in tender etc AIS transponder: Not that "you" need it, but the commercial guys won't be keeping a radar watch, nor will your boat necessarily show up if they did need it and then they can call you on the DSC radio Depth sounder:, but more specifically a forward scanning sounder, lets you nose into an anchorage, inlet etc and see in advance what's coming. Handbearing compass or equivalent in binoculars to shoot bearings while piloting Autopilot so you can take a break from steering once in a while to pee, change/trim a sail etc This will require at least a heading sensor, or some means to send it steering towards a waypoint if it's more than a windvane. MFD with Marine/sunlight viewable display where you can see from the helm while conning in crap weather. It should show chart, radar, forward scan, AIS nice if it shows other aspects such as NMEA2k data from ship systems, and sailing instruments if you add them. Most come with GPS now, so that's a given Barometer to know when the weather is changing Radar: because those ATON's are not as easy to see at night, and the small boats won't have AIS, and you can travel at night, in fog and rain Modern Doppler rigs are well worth it, though you want a "heading sensor" to allow overlay tp make sure the return is the ATON Sailing instruments: Speedometer if you want to know how fast you are traveling through the water vs SOG Water temp, often comes with a combination speed/depth/temp transducer apparent wind & speed on masthead Useful for autopilot steering to wind heel/trim and derivatives motion sensor if your autopilot and MFD are able to use them to give better TWS, TWA and steering Computer(s) & Tablets Something to calculate target wind angle and boat speed vs polars Some type of weather routing/passage guide/information lookup beyond your Cell phone Ability to echo MFD display while you are below/in the head Infrastructure to run all of the above: 12V system VHF/AIS direct to fuse breakers for all the big stuff NMEA 2000 to connect AIS/MFD sailing instruments et WiFi to allow computers/tablets to access data/images Wired ethernet to pass radar images around
  15. LionessRacing

    PHRF is not run by self-interested clowns

    As a Naval Architect, you should then be better positioned to challenge the rating, if a "New on the scene" boat of similar characteristics is given an unreasonable rating. Others of us are not technically competent to present a well reasoned and convincing case based on unassailable technical facts, logic and calculations so we tend to bitch and moan. My 40' 1962 boat rates 171 and another well known 40' 1962 production boat rates 114. When I can momentarily sail boat for boat with one of them, is it indicative of my rating being a gift, or perhaps they are not sailing their boat up to it's? When a local club decides to just toss the non spinnaker boat (me) into a spinnaker class with no rating adjustment is that reasonable? When PHRF NORCAL states that they don't have any means to suggest such an adjustment, but PHRF NE uses 15 sec for lack of any other does that make sense? It's supposed to be fun.