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I'm modeling a very simple shape flat bottom skiff so there are fewer lines on screen and the shape is easier to illustrate. here the skiff is bow on to a wave and therefore the bow pitches up and down. Pitch is the name for the rotation of boat's waterplane on a transverse 'axel', I show a play gro...

goatram, let me encourage you to make all effort to lift the cabin top OR drop the deck, don't allow the original boat to make your head bang or brush the ceiling/cabin top lining!!!! 'Spoiled one' is preaching to you Brother !! he's telling you the Gospel in (metal) Boats: it's yours- make it fit Y...

fisherman, we're getting there but I realize its not very quick!! Let's add some boats to what we just discussed, the reason I use geometric shapes before was to make the points obvious graphically. Here's a skiff shape, that will help review the ideas we've got up to this point. I realize that many...

mojomizer, thanks for your interest. I hope this is working step by step, but if not then we'll get after some corrections or clarifications once I get some more up to on this topic. We've discussed the "Body Plan" view of the hull and I'm going to dig in there a bit. A jon boat's section ...

mojo, yes temp and salinity both influence the wt of water so they both effect wt and to some degree density of the water too. (Cold water operation of propellers were found to need different pitches in WWII when the "ply-layered-dead-plant" PT boats were run in Alaska instead of the warme...

I've reread what's posted and decided I needed to make a few more basic points, I know that I'm back to flogging the deceased equine :deadhorse: but.... if we start to make shape and immersion illustrations without some of these points "landed, gutted and iced" -we'll end with some readers...

Tim, Barry thanks for the reply. I’m sorry that Barry misunderstood what I posted, shown by his incorrect paraphrase of my post; Barry: "The comment that the thrust in a water-jet is developed in the intake via ram is incorrect.” That shows I’m not communicating very well! I didn’t say or mean ...

Bob, the ribboning has to be quite close together to give a smooth curve, the rewelding become extensive, all to get a 1/2 or full pipe if you put the other half of the pipe inside the bulwark? There are no extrusions the size you're discussion with a flat surface that will not require forming or at...

To keep the topic moving I'll introduce a couple of exaggerated images, the reason for my exaggeration is to create a mental picture that we keep with us as we try to discuss shape and performance. http://i383.photobucket.com/albums/oo273/kevinmorin_photo/Hull%20Lines/Centers_1A.jpg first is the ide...

Well, slap me with a cold dead halibut- alongside the head :skillet: !! these props/impellers are not fully axial (prop/fan/impeller) but they oscillate (rotate AROUND a small center) therefore avoiding the 'jet' pumps three or four limits, this won't need a stator behind the flow to keep the nozzle...

We're going to be discussing the hull's shape and how a given shape performs, so we need to begin to 'see' waterlines or waterplanes or the planing surface of the hull in the water. This is not the simplest thing to illustrate so we'll begin with some basics. http://i383.photobucket.com/albums/oo273...

Guys this is just a 'dual prop' axial flow water pump, the same evolution of concentric shafts that Volvo brought to the inboard/outdrive 'leg' but in this case, applied to the Hamilton pump. Axial flow is axial flow. This won't change the physics of pumps but it may give them more flow in certain t...

I don't want to beat a dead horse :deadhorse: but... (and everyone likes a nicely rounded stern) I'd already done some sketches for netman's skiff build and the lines article that we can reuse to make sure we're all talking the same lingo. http://i383.photobucket.com/albums/oo273/kevinmorin_photo/Hu...

Just keep bringing up the questions if they get lost, I'm doing a bit of sketching to reduce the text so we'll get to the additional questions, mojo entry is a 'biggie' coming along shortly. Fisherman, more terms but some visuals to go along. Sculpin, I'll add the Cope to the shape discussion as we ...

fisherman, yes, those are the steps and the sheers of the hulls so far are: A stepped B hollow C stepped (almost powder horn except for angle points in sheer) D hollow E Powder horn (S shaped) F straight or nearly hollow (not sure without true profile image) G straight then stepped then hollow forwa...

Links to some definitions of terms http://www.glen-l.com/resources/glossary.html http://en.wikipedia.org/wiki/Hull_%28watercraft%29#Terms http://www.fish.state.pa.us/anglerboater/1999/julaug99/boathull.htm http://www.boatsafe.com/kids/022298hulls.htm After reading some of these links, you probably r...

We’re not really going to get into a full blown boat design post here, at least I don’t anticipate that because there’s lots of hours of study and working out problems and trying to design (draw and calculate) for yourself as you study the overall topic. But…. (everyone likes a nicely rounded stern)...

ehsvp, ordinarily that would be rolled with a pyramid roller guiding the operator either templates or putting the pipe up and down, onto the boat, and working below the sheer with the roller. You use the pipe sized dies and then a flat roller on the other side for 1/2 pipe, in your case you'd be rol...

paddler, in case you're interested here are some images of the sand blast pot I've made plenty of times over the years from whatever is on hand that comes close to these functions. http://i383.photobucket.com/albums/oo273/kevinmorin_photo/sandblaster%20pot/SandBlaster_1a.jpg first a pot, this one a ...

paddler, drilled out rivets are a pain if you can't work to the back side, even if you were to replace with plastic washers and even plastic sleeves the seal with rivets isn't the best. I'd want to look at threaded stud mounted hardware but that implies working the back side of the surfaces, so if t...

paddler, the cause of the corrosion is the (methods of) installation of the fasteners and the windows, but its not limited to Hewes' boats the practice is widespread and the reason is either ignorance or an unwillingness to build well? I have seen less than year old boats from Hewes with many other ...

Goatram, we've discussed acid etching in lots of contexts before- so anyone interested could use the Search function at the upper right corner of the Home page and get some reading material. Being safe when using aluminum hull maintenance products is the only way to be sure you're able to share your...

mojo, thanks for the kind words, I'm always glad to be part of AAB.com's conversations about shape and building. Fisherman, we can keep moving here, or move if you prefer, its always good to check with the welder to see if he's got any ideas about organizing posts. One thing I'd like to suggest is a...

Fisherman, I'd put the new Hull E closest to C as the chine of A is much higher compared to the keel in A's forefoot; so that A is closer to D than C or E from what I can tell. Still like to have all three views or a lines plan set, to make any kind of 'true' statements. But this surely confirms moj...

Karl, the paint and zinc are not harmed in my experience, the galvanized is brightened by not removed. Paints, plastics, rubber and other elastomeric products all seem to do OK, but I'm not saying the acid stays long. Once sprayed, spread, painted, put on the metal, it only takes a minute or two (no...