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Type: Posts; User: Skiff Man

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  1. Replies
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    Re: Building Ninigret

    Same here. It is easier to do than to describe in words.

    To attempt to clarify what I said above: You are plotting the radial line (from deckline to chine) in plan view first, then elevation...
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    Re: Doug Hylan Crab Skiff build in Florida

    Great work. People around here would gather around it at the ramp full of praise.
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    Re: Cement and re-bar ballast casting

    It looks like you used a pre-packaged mortar mix for the casting of bearing pedestals. That is a good choice in your case. It will likely be highly impermeable, and might be shrinkage compensated...
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    Re: Building Ninigret

    Yes. Loft the boat in plan. Draw a radial line through the mid-height point of each topsides frame station. That line will show how the plywood will lay in a flat plane when wrapped around the...
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    Re: Jumping in with both feet.....

    Glad to hear Susan has made a full recovery, and that you are on your way. The mouth of the Chesapeake can have a tidal current of 7 knots, so it will challenge all slower speed boats. Get someone...
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    Re: Yet another wood boat...

    NICE! The boat is looking great. The inner sheer clamp is called the coaming. The rubrail-washboard-coaming assembly is a structural member that provides transverse stiffness against buckling of...
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    Re: First wood boat build, need advice

    PL Premium 3X works great for trailered boats. It's never failed any of my submerged tests, but I don't consider it a substitute for epoxy.
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    Re: First wood boat build, need advice

    You could use PL Premium 3X for glue, plus Porch and Floor Alkyd Enamel for finish. Dampen wood and allow to dry before gluing. Thin first coat of paint with xylene as a primer, then apply two...
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    Re: thoughts on what to build for my needs

    Eggman918, I worked on a sail / electric / kicker design for myself a few year ago. It is an interesting concept with many conflicting requirements. I am not sure what is optimal for your...
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    Re: Spira boat design help

    Sorry that response was clear as mud. As suggested in an earlier post, you can scale the dimensions of these boats right off of the computer screen using the study plans and a ruler. You can then...
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    Re: Spira boat design help

    mike88, have you made a decision yet? For your usage I think that the 21' Tiburon Panga with a 75hp would be the best pick of the Spira boats. I know it exceeds your length limit and 50hp goals. ...
  12. Thread: Skiff Rocker

    by Skiff Man
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    1,249

    Re: Skiff Rocker

    The second method where you cut a hog into the topside plank is the better method. It allows you to build the rocker you need, and build the topside rake angle that you want.
  13. Re: Making my own Sailing Dinghy Plans: questions

    This is also the approach that I use. Stability is correctly adjusted as boat length changes since the design wind velocity is not typically scaled up and down with boat length. For typical...
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    Re: Modified Rounded Bottom Egret

    gilberj, you are right on all counts. I modeled the original Egret as accurately as I could, then bumped the bottom down 1.8" to get 500# additional displacement. I placed 500# more ballast low...
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    Re: Modified Rounded Bottom Egret

    I guess my main concern was how the arc bottom lateral thrust would be taken when the boat is sitting on its bottom. Since there is a central bulkhead this is probably of little concern. I still...
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    Re: Lumber Yard Skiff screw schedule

    Looking great! Is there an outer stem? Heel of stem tend to take a beating. Are you going to tape the chines?
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    Re: Modified Rounded Bottom Egret

    I already read it twice. Lots of good input.
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    Re: Modified Rounded Bottom Egret

    Athwartships tension members are required to get shell action from the arc bottom. Or perhaps you could design the athwartships thrust to be taken by the topsides in shell action combined with their...
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    Re: Modified Rounded Bottom Egret

    navydog, I am not sure why you think that the arc bottom with the keelson will be stronger than the as-designed flat bottom. The arc bottom will try to carry point loads on the bottom in shell...
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    Re: Newboy with Stauter seeking knowledge

    That is a great looking boat. The basic rules for oars and oarlock location:

    Oar length = 25/14*(distance between oarlock pins)
    Center of oar elevation at the oarlock = Top of thwart elevation +...
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    Re: What is it that makes a planing boat wet?

    Great video Russell. It looks like your bows go under in the larger waves, so no spray. And the spray rails knock down the sheets of water from the smaller waves. It looks very dry.
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    Re: What is it that makes a planing boat wet?

    Boats tend to be wet when near vertical hull surfaces intersect the water surface forward.
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    Re: New build: Simmons Sea Skiff 18'

    I vote for an average of options 2 and 3, and with the coaming bumped up a little to keep water out. You will have geometric constraints at the foredeck (and the transom) as you stated.

    The...
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    Re: Hull strength flexibility

    Flexibility at connections is the bane of wooden construction. Prevent that, then good structural analysis and design should take care of the rest of the problems.
  25. Thread: SV Swan

    by Skiff Man
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    2,809

    Re: SV Swan

    You should read the Skene's Elements book. It shows you how to calculate CG of the boat, CG of the displacement, and the stability against, and overturning of, sail forces.

    You seem to be jumping...
  26. Re: Modified Crandall Black Arrow build progress.

    The hull is looking great. It could use 2 or 4 semi-triangular running strakes for some grip and to trap some air to ride on. Is this a mid-engine boat or is it getting an outboard? The hull might...
  27. Re: Sneakeasy - Modified Clam Skiff bottom shape choices for performance on Sneakeasy

    Sounds like you are trying to change the original design function of the boat by quite a bit. I wouldn't think that the Sneakeazy is the type of boat where you would worry about chine tripping. The...
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    Re: The Harbor Master Called me Today

    Hope your family enjoyed the field trip. We at least kept the August heat away for your visit.
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    Re: Modifications to the Brockway?

    Don't do it. It is functionally the wrong shape for the topsides, and will be ugly to boot. A coaming and washboard would be a great addition, and better at keeping the kids in the boat than the 3...
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    Re: Outboard Skiff (back to the drawing board)

    Peak HP in the 5000's, peak torque in the 4000's, and best cruise economy at about 4000 RPM; 2 stroke outboards have performed like this for 40 years on planing boats.
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    Re: Outboard Skiff (back to the drawing board)

    Tapsnap, that is a good start. I will give a few suggestions:

    1. The freeboard is quite high. Bow blow-off is a shortcoming of flat-bottomed skiffs. Freeboard of 1/7th of boat length at the...
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    Re: Atkin "Elon Jessup" Outboard Skiff

    You are on the right track. I would try to preserve the sheer line/deck line so that the boat looks original. Drawing the bottom dead flat from transom to heel of stem will perform better than the...
  33. Thread: LYS Chines

    by Skiff Man
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    Re: LYS Chines

    1 1/2" or 1 1/4" is very thick for a chine log on a 16' boat. I would laminate it in two pieces if that thickness was actually needed (2 by 5/8" x 3").
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    Re: Downsides to flat-bottomed skiffs?

    My main complaints about my flat bottomed 18'x6' skiff (aside from the pounding underway) are that the bow blows off too readily, and that the shallow draft and deep heel of the stem make launching...
  35. Re: Calculating the radius and angle for Bow-roof greenhouse

    These bow structures are designed as frames, not arches. So the bottom of the bow-frames should be vertical or you will get a lateral arch thrust. You could angle your knee walls to match the angle...
  36. Re: Considering building a cedar strip, but wondering if it could be a more modern sh

    Weight can really add up fast in a small fishing boat like that Tracker:
    2 men
    Outboard
    Gas Tank
    3 Batteries
    Boat Hull with console and compartments
    Trolling motor
    Fishing gear
    Ice, food and...
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    Re: Designing a 19 foot outboard runabout

    You have good taste in boats based on the examples. The hull form you are planning would be about 3000+ Lbs loaded, with 20 degree deadrise at the transom, and at 19 foot would do OK with about 150...
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    Re: Crouch's formula, how low can you go?

    See page 3
    http://www.boatdesign.net/forums/hydrodynamics-aerodynamics/resistance-factors-planing-hull-low-speed-35799-3.html
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    Re: Crouch's formula, how low can you go?

    Internet search for a graph of planing hull resistance as a function of Volume Froude Number. There will be a family of specific length curves. Calculate power as velocity times drag. Divide by...
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    Re: frame size for 12ft hannu skiff

    1x2 will be fine. Place a couple near the thwarts, and one in between those for good luck. I would skip the bottom frames unless you are building a sole. Make the bottom thicker to compensate. ...
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    Re: Fuel fill locations for open boats.

    Unconventional, but you could build your side deck with coaming over to the console to create a spill zone that would wash overboard. Two portable tanks aft solves a lot of issues; wieght...
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    Re: Candlefish 16- first build

    Yes, definitely thin it. The traditional thinner is terpentine 50/50. You can also use Xylene or mineral spirits. Apply multiple heavy coats with rags then stainless steel wool Wipe bone dry...
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    Re: Small Fishing Boat build advice

    I already gave my 2 cents on this thread, but a pointy-bow skiff is a fishy-er skiff than a jonboat because it is much more quiet. Building difficulty is the same. Recovery at the ramp is easier...
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    Re: titling a wooden boat in Virginia

    I would think that VA wants to know the value of the boat, and to determine that the boat is not stolen. The documentation I described above would still apply if you could forward it to the owner.
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    Re: Need help understanding stability

    Flat bottom row boat characteristics are terrible in a flat bottomed planing powerboat. There should be little to no rocker aft, especially for higher speed designs. The rocker forward should be...
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    Re: titling a wooden boat in Virginia

    Take your unsigned title application form to a Notary Public along with photos of your build receipts, a few build photos, and photos of your boat from all possible angles. The Notary and you will...
  47. Re: Video of Rascal at 3 speeds showing engine trim and how much hull in water

    I think your boat and motor trim look perfectly normal at the three speeds.

    Low speed: Motor tucked under, bow down, chine wet over much of its length.
    Mid-speed: Motor about vertical, about 1'...
  48. Re: I just cannot decide on a framing material, advice appreciated.

    Keeping in spirit with the design, you might try #1 SYP 2x6's for permanent wooden foundation for frame stock. It is CCA treated (water soluble) and kiln dried after treatment. You can glue it. Treat...
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    Re: Small Fishing Boat build advice

    Boat should be 18' long for two people casting, but 15' long will work to keep the boat sides to two scarfed pieces of marine ply.
    5' wide will be nice, and the bow height should be less that 1/9th...
  50. Re: Video of Rascal at 3 speeds showing engine trim and how much hull in water

    Peter: Your boat looks great at the three different speeds in your video. It looks to be locked-in at each speed. Trim-steering-throttle are all equally important in a performance hull in my...
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