CaptainAhab

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154 F'n Saint

About CaptainAhab

  • Rank
    Anarchist

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  • Location
    South Australia
  • Interests
    Finding the White Whale

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  1. CaptainAhab

    What filler will hide thin gaps

    99% of the time the saw dust method yields poor results. If you put finish in the end grain of any wood it will always be darker than the face or side grain. When you mix saw dust into resin or glue you are seeing a very high percentage of end grain. That is why it’s darker. Another option is to fill it full of straight epoxy. Mix some up in a small cup. Let it gel then force it into your gaps.
  2. CaptainAhab

    South Aus inshore trailerable boat racing

    Off the beach cats are the best boats for 10-12kts and 41c heat. No need for a wetsuit. We’ll have our Taipan 5.7.
  3. CaptainAhab

    shop vacuum anarchy

    Decibels. Cheap vacs are like jet engines. Cheap vacs are also like computer printers. The units are disposable inexpensive garbage. The company makes their money selling the bags or cartridges for insane amounts of cash. What is the bag to unit cost ratio?
  4. CaptainAhab

    Team NYYC

    How do you know it’s an al cored hull?
  5. CaptainAhab

    What materials to use for dagger board

    You have almost no understanding of solid wood if you think you can make a dimensionally stable piece of any species 1/2” x 20”.
  6. CaptainAhab

    What materials to use for dagger board

    1/2” thick is a plate not a board. No real shape to it. Vertical grain red cedar is used because it has a very high strength to weight ratio. Very stable. It’s also nice to work. Rot resistance is an added benefit, but not the reason for it’s use. 20” wide is too wide for solid wood. The max out at about 12”. They are typically skinned with 17 oz Biaxial glass. Tows of uni s-glass or carbon are placed at the maximum thickness. You need a very thin core and plenty of glass to do a plate. The trick is keeping the whole thing flat. I’d probably use 1/4 marine ply with a 1 layer of biax and 1 layer of uni over the entire board. More is better. The plate would typically be done with aluminium. 1/2” plate is pretty stiff.
  7. CaptainAhab

    Best tool to shorten stainless bolts?

    What would you use for backing plates other than G10. The first time we used those was the early 2000’s. Before that it was either stainless fender washers that look like shite and possibly crush the core. Or some nice 1/4” x 2” 6061 that you can paint if you feel the need.
  8. CaptainAhab

    Best tool to shorten stainless bolts?

    Getting back to cutting bolts. My mentor who happens to be a now retired composites/structural engineer at the Boat, liked the vise grips. We would install the jib tracks with 1/4” aluminium backing strips. 1/4-20 flat head machine screws and nylocks. After torquing we would grab on with the vise grips and lightly wiggle the bolt until it work hardened and snapped. Take a file and dress the burr. If you got a ton to do this is very fast.
  9. CaptainAhab

    Best tool to shorten stainless bolts?

    At the very least the 304 stains much easier in a salt water environment. I think of 304 as construction grade(decking screws) and 316 as marine. We do have some trouble in AU getting all of the boating(inch scale) fasteners in 316. It’s another of those weird AU not metric industries. We primarily use inch fasteners on boats. The metric fasteners are used for some Ronstan fittings or some electrical parts. Everything else is held on with 1/4-20’s. Just like the States
  10. CaptainAhab

    Best tool to shorten stainless bolts?

    “The most popular stainless steel is Type 304, which contains approximately 18 percent chromium and 8 percent nickel. At room temperature, the thermodynamically stable crystal structure of 304 stainless steel is bcc; nevertheless, the alloy's nickel concentration, as well as the small amounts of manganese (about 1 percent), carbon (less than 0.08 percent) and nitrogen (about 0.06 percent), maintains an fcc structure and therefore the alloy is nonmagnetic. If the alloy is mechanically deformed, i.e. bent, at room temperature, it will partially transform to the ferritic phase and will be partly magnetic, or ferromagnetic, as it is more precisely termed.” It’s from some Scientific American article. I would also guess that the intense heat from the friction of cutting cooks off the alloys, leaving more iron exposed. This would add to the work hardening from the cutting.
  11. CaptainAhab

    Best tool to shorten stainless bolts?

    I’m American. I moved to Au 10 years ago. Chinese stainless wasn’t that common in the US 10 years ago. Unless you were looking to buy the cheapest fasteners available. Everything is marked by law here as well.
  12. CaptainAhab

    Best tool to shorten stainless bolts?

    The vast vast vast vast vast majority of stainless comes from Taiwan and is really good quality . The US setup stainless manufacturing there in the 1980’s, before that stainless was expensive. Chinese stainless is relatively new. Most products are marked with the alloy 304 or 316 and the country of origin. Beware of Chinese 302. It’s magnetic and rusts quick.
  13. CaptainAhab

    Going downwind slowly in a Laser

    If you don’t want to sail down wind in a Laser don’t do it. Plan on sailing the broadest reach that makes you feel comfortable. Start thinking like a sport boat or catamaran... hot angles & more gybes. The reality is that most of us experienced Laser sailors have three modes of sailing. Racing, race training, and blasting around in a blow. We generally do not go directly downwind when blasting around, because it’s not fun. If you want to go downwind in a blow with control. Tighten both the down haul & outhaul as tight as you can to depower. Leave the daggerboard down. It increases drag which slows you down. Tie the knot in your mainsheet so that the leach never goes past the mast. The boom should be at least a foot behind the mast(this is how we get the kids to start sailing downwind). As usual sail flat all the time. Keep your tiller extension flat on the deck so you don’t oversteer. Do not move your body weight to adjust the heel. Pick a spot get comfortable. Play about a foot of the main sheet in and out to control the heel. The more you move your body the more unstable the boat becomes. When gybing pull the main sheet in halfway then gybe. It slows the boat down and puts you more in control. The best thing about Lasers is you learn by swimming. Most sailors in other boats don’t learn, because they don’t capsize.
  14. CaptainAhab

    Bicycle with a sail

    We’ve got a similar thing in Au except it’s designed for the beach. They are used like an ice boat. We’ve got many beaches here that are flat, wide and hard enough you can easily drive on them. I’ve seen a guy going about 30kts down the beach, while the kite boarders were shredding out in the surf.
  15. CaptainAhab

    Best way to Measure keel foil section?

    Spiling. This will allow you to quickly take accurate sections. You can use a piece of ply and a stick to takeoff. Redraw it and measure away. There are a few good videos on YouTube