Monday, September 15, 2014

Engineering plans for Autumn

This Autumn, I intend to redesign the shipboard electrical AC and DC systems:
1. Improve the DC power Sources:

  • New battery Charger
    • Xantrex TrueCharge 2 40A
    • Remote operation panel
    • Battery temperature monitoring
    • Wires #8 or better
    • if I use #14 wires, 14 feet long, their R is 38 mOhm, and the power loss is 60 watts!!!
  • New alternator
    • Electromaax 120
    • Serpentine belt kit
    • Alternator and battery temperature monitor
    • External voltage regulator Balmar 614
    • New wires #2 or better
    • Automatic Crossconnect Relay (ACR) BlueSea 

2. Improve the wires:

  • Connection between Battery and starter will be all #1 or better; probably should be #1/0
  • Includes battery switch and ACR connections
  • Automatic inverter transfer relay for the AC power outlets.

3. Improve circuit protection:

  • Terminal fuses for batteries
  • New breaker panel
  • New wire barrier strips
4. Improve system Measurement

  • Battery monitor
  • Digital multimeters on the breaker panel for AC and DC
  • Note that Blue Sea has a Vessel Systems Monitor, the VSM 422. It's not really as good as I'd like; it only monitors state of charge of one battery; it only handles 2 tanks; and it has a simple bilge sensor.  The Command Connect system seems another approach; but it requires a subscription.


Tuesday, September 9, 2014

When I was younger, so much younger ....

... I  never needed any body's help in any way.
--John Lennon

I have looked for help from a number of sources in the last two weeks.  I asked Hansen Engineering and Westerbeke for help in finding a bracket to hold a new larger alternator, or the CAD script for making it, or the drawings for it. They refused me any help at all.

I asked Raymarine sales engineers at the Newport International Boat Show for help in validating the design for a SeaTalk(ng) installation of new wind, water speed and depth measurement, integrating it with a new radar and chartplotter.  They told be to post a note on the Raymarine forum and someone will probably answer it.

I asked Garmin for help in reusing the depth, speed and wind transducers I have with a NMEA 2000-compliant network system, and they said it can't be done; I have to buy all new transducers, and figure out how to install them.

...Now I find I've changed my mind and opened up the doors.

Sunday, September 7, 2014

Labor Day Summary

It's now after Labor Day, and I would like to summarize the season's issues.

First, the PDQ WiFi extender system is absolutely non-functional.  It appears to have components which could be usable, but there is no technical support whatever.  Not recommended in the least.

The early-season failure in the Raymarine radar turned out to have been in the main console.  It was repaired by the manufacturer, after about 6 weeks in  their shop, and worked for the rest of the summer.

The transducer for the depth sounder was replaced in early July, and I can't have been more pleased. Depth soundings are consistent, and frequent, although they are still often disturbed by wakes.  Without a new set of electronics, using a different signal processing, I don't think its performance can improve.

Rune's wind sensor failed on our cruise to Cuttyhunk.  When we returned, I sent a technician to the top of the mast, and found that the sensor connector was loose.  Connecting it again solved the problem.

For the first time in seven years, we raced in the Classic Yacht Regatta, in Newport, RI.  For the race, I removed the self-tacking jib and its boom.   We raced without spinnaker, and the rules prohibited our Mylar genoa.  Incidentally, the rules also would have prohibited our square-topped mizzen if it had been a mainsail.  They also prohibited a flying sail change, which we were able to do with our experienced crew; if we had placed we would have had to protest ourselves.

We took 6th out of 14 boats, which was quite respectable.  As always, we found things to improve.

The genoa track on the port side was lifted and bent by the load of the #1 jib.  The primary reason seems to have been that the genoa car was positioned above a scupper in the toerail, which forced the shipwrights to use a short screw to fasten the track.  The screw gave way, and the rail bent.

Fixing this issue is a matter for some thought.

The sail prefeeder for the headstay foil  track was lost in the confusion of setting or changing sails, so I replaced it after the race, and changed the lanyard to a steel one.

I also found that the lanyard I had added to retain the headsail feeder was wrong. It turns out that when we wish to change sails during a race, we need to hoist them independently of the roller furling mechanism.  To get the masthead swivel out of the way, we must drop it down to the bottom of the headstay foil, past the sail feeder gap, and stow it just above the roller drum.  Then the swivel is below the feeder gap, and we can feed the sails into the foil above it.

I had fixed the sail feeder in its place in the gap with a short lanyard, which encircled the headstay.  It was too short to allow the swivel to drop below the feeder, so I cut it and replace it with one just long enough to pass the swivel.

Andrew believes that the 150% roller-furling genoa, which was our most useful sail in  this and most regattas, is past its worthwhile life.  It can't be set with a firm trailing edge because it stretches away from the mast if set at its optimal tension, and tangles with the upper mainmast spreader if it is set too tight.  He suggested I try to get Doyle Sails to make one with a modern loop attachment at the clew, instead of a grommet.

The #2 genoa,which is really about a 105% sail, worked well for the windward legs.  We could perhaps have used a reef in the mainsail for about 15 minutes, but the course changed down wind, the relative wind moved aft and we were able to carry the sail comfortably.

It seemed that the mizzen staysail flew better when tacked to the base of the #5 and #6 main mast shrouds than when tacked to the loops on the cabin roof we have been using since we began racing.   When I looked at the photos taken by North Sails from their regatta support boat, I thought the base of the windward forward gate stanchion might be even better.  It is  adequately reinforced, and does not need the awkward redirection of load on the turnbuckle when the sail is tacked to the shroud.

Radar scanning, continued.

The radar scanner, a Raymarine RD218, came back from their repair facility.  The diagnosis was--there is no problem.  The scanner worked when put on the bench, and was checked out for more than six hours of run time in New Hampshire.
Therefore the problem has been isolated to the inter-unit wiring.  The cable run from the display to the scanner has four multi-pin connectors and eight butt connectors in it.  I received a list of expected pin-to-pin resistances as measured at the end nearest the display, and I have been checking them.  They are failing, but in annoying ways, seeming to shift when I separate and reconnect the mast-base connectors.

First cruise of the season

Rune is  underway, on loan to Andrew and his family.  They sailed on 7/2 to Block Island, and are rafting, with Josh, Sue and their family, on Bob A's mooring.
Before she left the dock, the refrigerator and the radar were both carefully tested and were operating.  The dinghy lost some air, after about 4 weeks in the water, so I dried its bilges, topped up its air, and charged its electric outboard motor.
I failed to move the boat notebooks on board, so Andrew had to call about operating the potable water system.
The only known operational shortcoming is the depth sounder; it yields about one good measurement out of five pings. A transducer engineer from Moore Electronics said that this is a fairly good indication of a failed transducer.  I did not have sufficient margin of time to replace it before Andrew needed to depart.

Commissioning complete

I have finished with commissioning the water system.  I flushed the winter antifreeze and cleaned the tanks with a very dilute solution of sodium hypochlorite (bleach).
I have installed the PDQ Wifi booster system; I need to check on the configuration procedure.
The repair number of my Raymarine radar is 434835; ETR is 5/28/14.