• Announcements

    • Zapata

      Abbreviated rules   07/28/2017

      Underdawg did an excellent job of explaining the rules.  Here's the simplified version: Don't insinuate Pedo.  Warning and or timeout for a first offense.  PermaFlick for any subsequent offenses Don't out members.  See above for penalties.  Caveat:  if you have ever used your own real name or personal information here on the forums since, like, ever - it doesn't count and you are fair game. If you see spam posts, report it to the mods.  We do not hang out in every thread 24/7 If you see any of the above, report it to the mods by hitting the Report button in the offending post.   We do not take action for foul language, off-subject content, or abusive behavior unless it escalates to persistent stalking.  There may be times that we might warn someone or flick someone for something particularly egregious.  There is no standard, we will know it when we see it.  If you continually report things that do not fall into rules #1 or 2 above, you may very well get a timeout yourself for annoying the Mods with repeated whining.  Use your best judgement. Warnings, timeouts, suspensions and flicks are arbitrary and capricious.  Deal with it.  Welcome to anarchy.   If you are a newbie, there are unwritten rules to adhere to.  They will be explained to you soon enough.  


  • Content count

  • Joined

  • Last visited

Community Reputation

0 Neutral

About cal40john

  • Rank
  1. Beta Marine Diesels

    I've never heard of vapor lock with a diesel. Just looked up Reid vapor pressure at 100 degrees F. 10 psi for gasoline, 0.021 psi for diesel. Was a metal fuel line tied to a dry stack exhaust? Could it have been an air leak resolved by replacing bad connections?
  2. Rudder Drive??? Really?

    You can try it out. Go find an old Tarten 30 or Yankee 30. Prop exits right at back end of the keel. Actually all Amel Super Maramus do as well. Probably several others I'm forgetting. I haven't tried, but I've heard they don't back down very well. The further the prop is from the rudder, the more difficult maneuvering is in general. Unless you have a full keel with prop in an aperture... in which case maneuvering is nigh on impossible Why does having the prop at the back of the keel affect back up maneuvering? Prop wash is away from the rudder anytime the prop is in front of the rudder backing up. The Cal 34 has the prop out of the keel and that is the best boat I've ever been on for backing up. But the reason for that is the rudder pivots 360 degrees. When you back up, spin the rudder 180 and it drives about as well in reverse as forward. Cal 40 also has prop out of keel. Was dismayed that the Cal 40 does not back like the 34. The rudder post is not 90 degrees to the hull and the rudder gets stuck when it is almost reversed.
  3. Filling a RIB hull with Foam

    A foam core Lightning our club acquired was in great shape, district champion the year before and kept dry in a garage. After one year of being kept in the water at our club we took it to districts, everyone was amazed we were 100 lbs overweight at the weigh in. A ski company made windsurfers for awhile. This was when ABS was in. Other manufacturers sealed the hull deck flange. This company thought the closed cell foam would not take on water and didn't seal the flange. A couple of the club's boards had picked up 50 lbs of water making them 100 lbs by the time we got rid of them. All 6 of them at minimum were at least 20 lbs over. A couple of Hobie masts that no matter what we did took on water. It was recommended to pour closed cell foam a few feet around any fittings. A few years later none of those boats could be righted because of how heavy the masts were. Have not had good luck with closed cell foam being long term water resistant.
  4. Traveler Designs

  5. Don't believe this is the current one, but how much could they have changed it? https://law.resource.org/pub/us/cfr/ibr/001/abyc.A-01.1993.pdf
  6. Why do big boats plane faster?

    It sure does indeed decrease as there is much less hull in the water But you are supporting the hull with hydrodynamic lift and that takes energy. Bethwaite says is that the power to speed ratio approximates a linear function at planing speeds, while subplaning speeds it is a power function, not that the power ever decreases. This graph by Savitsky looks like the one in Bethwaite's book. https://en.wikipedia.org/wiki/File:Speed-length_vs_weight-resistance.gif I did find a page which shows modeling of a high speed craft shows a slight decrease in power needed just after getting on a plane. (Presumably as I didn't see a hull length number and the graph is in speed rather than speed/length ratio.) http://www.engr.mun.ca/~pliu/Recent_Work/Phull.html
  7. The easiest boat in the world to rig

    Hobie Bravo can take two people, and it has 4 cup holders molded into the deck. You did say simplest and drink beer. Our club leaves the mast up with furled sail. From taking rudder and mainsheet out of the sail locker to sailing is about 3 minutes. Quick pin and a hook to rig mainsheet. Optional boom is not that optional if you want to go downwind (add a minute to rigging time). Nice for those days when you want to get out for 15 - 20 minutes before the sun sets, just to say to yourself you got to go sailing today. It doesn't sail much like my Hobie 20 though.
  8. What boat is this?

  9. One emphasis seems to be that things have to be new designs to be cool enough to invest in. You have to have an IPhone 7 even if you had IPhones 2 through 6, and they did everything you needed. That's a moving target that sailing can't win. Single handing a Hobie 16 while out on a trapeze is plenty of fun, but apparently who would want to buy that ancient design even if it is fun. Around here you can get a beater Hobie 16 for $500. As far a being a beater, polish and wax, or paint it. $2000 will get you a 16 with good looking shiny gel coat and half way decent sails.
  10. Jammer or winch?

    All those years sailing before rope clutches were invented (didn't have them for years after they existed either) I didn't know I was ruining my winches by using them. The only thing I had to fix on winches over the years were some pawls, springs, and once had a pair of drums roughened. Never had flattened bearings.
  11. Heavy Air Sail Trimming

    On some designs with fully battened sails you can flatten the sail with the downhaul without tightening the leech. Hobie 20, Megabyte, Byte CII are ones I know of.
  12. Buoyancy bags

    IIRC the class spec is "positive buoyancy" and the boat weighs somewhere north of 700lbs. Fresh water weighs 60lbs per cubic foot, so simple math says 11.7 cubic feet or air will float the boat. However, as Foxxy says, you want the boat to be self-rescuing which means more flotation, it has has to placed to provide stability when swamped, and it has to hold the top of the centerboard trunk above the swamped water line. Smallish air bags under the side decks will not provide this last requirement, unfortunately. They will be good to provide stability, but the best way to provide a lot of buoyancy down low is to put canoe/pillow bags under the fore & aft decks, strapped down to the chines. If you can get to 18 cubic feet, that's 1080lbs of buoyancy which I agree should be enough if it's placed properly. More is obviously better, given reasonable placement and securing. About 25 years ago I rebuilt a then-25 year old Lightning and included about 1500lbs buoyancy in canoe bags. The securing straps were fastened to 3" wide fiberglass tapes, tripled and bonded along the chines. Cutting out the old buoyancy tanks (which were found to contain a bucket's worth of beer tabs and cigarette butts) saved enough weight that the boat came out lighter. I only capsized it once, on purpose near a beach, worked very well. FB- Doug It doesn't have to float above the centerboard trunk according to my instructor. When I was first taught how to right a Lightning I was told once it was upright to stuff t-shirts in the trunk, then start bailing. I'm glad I never had to find out for myself if it actually works.
  13. Anyone ever heard of an E-Scow ???

    Yes I have.
  14. 48 volts is not necessarily "safe"

    NIH has an article. Mostly about AC but also talks about how DC is different. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2763825/
  15. North Carolina link, not that it matters as it's a Federal requirement that documented vessels not display reg numbers as shown in the last post. http://www.ncwildlife.org/Portals/0/Boating/documents/Documented-Vessel-FAQ.pdf Documented vessels must display the state validation decal (registration decal) on the forward half of the bow. United States Coast Guard Documented Vessels may NOT display the NC registration number.