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Published 17.05.2015 | Author : admin | Category : Sailboat Drawings

Location: New Zealand Fast raft design I would like to build a fast raft for a competition.
Location: Tasmania,Australia There are heaps of threads about designing rafts, pontoons etc etc on this site you can search out - it might save a lot of repetitive advice. Location: Australia Take the tip, KiwiAndy, a catamaran configuration will win the race, they always do in these events !
Location: Milwaukee, WI Is a catamaran considered a raft under the race rules? Location: Milwaukee, WI Rafts made out of drums unless really long, say 80' or so, will not perform well without a bow and a stern fairing.
Going to need carve out an oarsmans station and mount some kind of athwart ship structure to handle the force generated by a powerful set of oars. Fit SOLAS orange smoke bomb launchers aft, port and starboard to break free at the start and to create confusion at mark roundings . Once clear, pound the competition with an Aft turret mounted 150mm , top loader, water balloon cannon .
Might be best if you built a small fleet of Assault rafts then manuvered in pack formation to achieve total river dominance. Of course, as Gonzo says, the outrigger mono would be better suited to paddles than pedal and prop, though pedal can be done on an outriggered mono, often slung over the side, giving a slightly asymmetric setup. Location: Adelaide, South Australia Maybe it's time to unleash a Warlike Weinblum.
Cut the end off of a barrel and fasten the open end together into a wedge shape (may require some heat). Location: New Zealand Preliminary raft design 2nd design picture attached.
Location: New Zealand One further question, should I bother trying to enclose the chain within a steel tube? When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
Location: puerto rico - spain design of a fast 27 catamaran Hi everybody.
Being a graduate of THE LANDING SCHOOL I am embarassed to admit I know what only half those numbers mean.
One other conditon was that we were to write a brief summery on what the design was to be about along with a freehand sketch. A day later, my summery was returned with what in effect said 'unacceptable' written on it. Just for the fun of it, why don't you post this list so everybody can compare it with the numbers you have already posted. Island hoper, dismountable ?avoid marina and insurance expenses, hurricanes-, fun ?I mean fast-, but able to deal with 6-8 long swells ?not steep-, 20-30 knots.
Fast, so light, -wood composite or foam but vinylester to keep it cheap- round sections at the sterns with lightly swept up buttocks, fine bow sections.
No engine ?maybe a small long leg outboard -, small battery bank for lights and instruments charged with solar panel or air marine wind generator. Dagger boards for upwind performance and kick up rudder for beach landing or unseen reefs, uppssssss.
I have the plans, patterns and photos of this design but have never got around to building it, and now AGE has got in the way.
Over the last twenty years it has proved to be the ideal Cat for fast cruising, racing and inter-island hopping. Location: puerto rico - spain great barrier express nice boat, I have seen before in multihulls magazine.
For a speedster without accomodation I would have thought a length to breadth ratio of 12 plus would be more desirable.
Also are you choosing vinylester over polyester for the longer curing and therefore laminating time? Location: puerto rico - spain lcb and lcf being longitudinal, distance fron the center of the profile aftwards. Designers agree that the semicircular section -in the stern hafl side- is the best comprmise between volume displaced and wetted area, meaning buoyancy and speed. To design a semicircular section using hull design software, you need to specify a three point surface, align at 90 and evenly spaced, with the weights set to one except the corner one, set to 0.7071. On the other hand, small cats are very wet, and, spcecially reaching and surfing waves, they tend to pithpole, -if you ever sailed a hobbie 16 you know what i mean, -the banana shape did not help-. I think for the nasty short wave formations which I remember in sailing around the West Indies the forward sections look too fine. Location: puerto rico - spain new hydrostatics cat 27 -for one hull- That is why I was wondering about the LONGITUDINAL CENTER OF BOUYANCY, my first question, widening the bow sections will move the cente of bouyancy forward, and the center of gravity has to be aligned with this LCB for the boat to sit trim. LCG longitudinal center of gravity is calculated by measuring distances from a center point and weights of every component to find the center of the weight of the whole thing, including the hull and deck, and in these case crew, since it is big percentage of its displacement. RIB tube around the hull adds aerodynamic lift and stability as well as providing efficient fendering and protection. Location: Marshfield massachusetts usa fixed seat, not sliding Mike, sorry if I confused you.

Location: Portland, ME There is a way to get the adjustable thwart without the complication and ugliness of the sliding seat system. Location: Cape Town Nice idea Clinton, ( Paul Gartside), but to get this absolutely spot on you'd also need to be able to adjust the position of the Oarlocks or Gates , then if need be , you could vary the setup according to the conditions , or perhaps even the number of rowers. Location: The heights of High Wycombe, not too far from River Thames Here are some links that some may appreciate. Location: The heights of High Wycombe, not too far from River Thames AAAARRRRGGGGHHHH! Location: Marshfield massachusetts usa all work and no play Checking back in, Spring is the busy time in my work and little gets done with the boating. I am excited to float the hull within a week or two to get the CF of the hull and then decide where to put my big butt and how far aft of the seat the oarlocks go (pictured, by Shaw and Tenney). Location: Cape Town Clinton, getting there , well done so far, exciting times ahead . Location: The heights of High Wycombe, not too far from River Thames Gig rowing in Cornwall this weekend. Thousands of people are in the Isles of Scilly for the annual World Pilot Gig Championships.
The event, which doubles the population of the islands, has attracted a record number of entries this year. There are 111 teams competing from around the world in a variety of classes, including crews from the Netherlands and the US.
The Veterans titles went to Falmouth Women's Vets in Irene Two and Caradon Men's Vets in Millers' Daughter. Hilary Moll, who travelled to the Scillies from Plymouth, Massachusetts, to row with team members in the gig Saquish, said she was there to learn.
Location: Michigan Iranian Fast Attack Craft These look difficult to deal with, first time I've seen them. New Iranian-built fast attack craft with platforms for two C-701 (Kowsar) anti-ship missiles. There is a reason the US Navy destroyed all of our PT Boats after WWII, didn't want anyone else to get a hold of them.
Location: Singapore Whats the mega fast gattling gun the ships have these days designed to shoot down incoming missiles? Location: Italy (Garda Lake) and Croatia (Istria) I think that one assault helicopter would be enough to deal with these and others too.
Originally Posted by RHP W trash one of those speed boats at a mile The cruise missiles have a range of at least 5 miles, do you see a problem?
Originally Posted by daiquiri I think that one assault helicopter would be enough to deal with these and others too.
Originally Posted by kach22i A swarm of these attacking in heavy weather may be too much, not 100%. I fully accept that these craft and crew would have to be considered sacrificial if going up against a US Carrier task force (in any conditions). Pesky and dangerous, one mistake, one error or pause in making a hard decision and the scale could tip.
Many complex US weapon systems last time I read, were on stand-by and took 20 minutes or more to become weapon ready. Besides which you only need one to get through, this cripples one ship that cripples the fleet looking after it! Location: New Orleans RHP the gun is called a CIWS (Close In Weapon System). That being said the reality is that a carrier battle group carries so many weapons and support vessels there is almost no change somthing like this could even get close enough to fire its missles let alone have a chance to sink it.
I can't remember what the exclusion zone for a carrier is anymore, but I can tell you that unless you have the admirals permission, you will never see one at sea. Location: OREGON threat to our Navy the Navy has the same 30 MM rapid fire cannon on almost all of the fleet. Location: OREGON threat to our Navy The big difference, as you know Masalai, is these are floating targets not going 300mph, OH, our sailers would love it, That is the danger of war for civilized people. Location: USA I don't know what the proper distance is for inline props (might try posting over in the 'propulsion' forum), but consider the Yamaha TRP design (twin-rotating props, on a very few select outboards). Submarine Tom Previous Member   Contra-rotating props of this nature are best spaced about half a diameter apart with the following prop about 10% smaller in diameter and of the same or slightly higher pitch, depending.
Submarine Tom Previous Member   Turn one bike around for greatly improved visibilty, safety and balance. Submarine Tom Previous Member   You'd be much better off with one bigger prop than two.
You'd be even better off with three times the length and five times the manpower, paddling.
Location: Windsor, Connecticut Here is a very simple exercise bike powered propeller. The pedal powered cat on the left of the picture uses professionally built Dart 18 hulls (about 17ft waterline), recumbent seats, and commercial seacycle prop drive units, one with a 12x12 prop, and one with a 16x16 prop.
Originally Posted by Tiny Turnip six drums as an outriggered monohull will be faster than 2x3 as a cat.

Now, if the OP and his team-mate have been paddling canoes together for a few years, then by all means go with a monohull! Prindle, f-18, ? shape but a little more conservative-for weight carrying, without creating under wing wave resistance.
I wanted to introduce certain convexity and the upper sections of the bow freeboard, to reflect water when sailing and to gain bouyancy when things start getting ugly. I'm not going to a sliding seat, but I'm goimg to buy the plans for a drop-in sliding seat unit and build it non- sliding, but adjustable. My next biggest decision is whether to build the boat open, with the traditional rangs fore and aft, and add tabs that allow buoyancy bags to tie off for when I am doing open water rowing, or do I just build in the buoyancy tanks? Still, I'll continue accumulating material for the rowing kayak and work at it as I have a chance. I have a book by RD Culler,, Boats , Oars , and Rowing, he seemed to know a thing or three about rowing and row boats,, , he mentions that when he learned the trade the standard thwart was 8 inches wide and the Oarlock was set back 12 inches from the aft edge of the thwart.
A normal carrier group includes not just the super carrier, but also a destroyer squadron, Aegis missle cruisers, 2-3 Missle Destroyers, a couple of attack subs and a whole mess of supply and smaller support vessels. Navy ships USS Port Royal (CG 73), USS Hopper (DDG 70) and USS Ingraham (FFG 61) were steaming in formation at approximately 8 a.m. I reckon there's more fun to be had from the pedal powered cat, both in the build and in the operation!
Maybe a bunk without standing headroom and a small copkit with swept up deck for boat handling in bad weather. Adding more points for the freeboard, hafly towards the deck, above waterline sections, would inflect a change in the semicircular underwater section, so my question goes, is there any other way to set the points so that you would need only one surface for the hull, or do we need to split into two surfaces and then bond them, to maintain semicircular section under water and flat or convex half way in the higher freeboard? Cliff, the apppearance of the faering is so neat that it would be a shame to mess it up with flotation compartments.
Some do have a new FLIR system, but until the fleet us updated to the new system they are pretty much useless against surface targets.
Not to mention that carrier groups always have armed defensive planes in the sky with AWACS and other reconasance resources keeping an eye out.
The new boat I sketched was almost eight feet shorter than the original and slightly less than 60% its displacement. In the design process a lot of things on the list are often going to end up being abandoned, so its a good idea make sure those things are not the things you really want.
Cutter rig with furlers ?only profurl-, full batten main with lazy jacks and reefing system ?harken style-, for easy single handling.
I'll still be considered to be rowing a fixed-seat, oar-on-gunnel boat, and therefore not have to move up a class. You could make a number of positions through sea trials and drill the holes in the shelf to suit those thwart positions. I've roughed out a set of 8' 11" wooden oars and we'll try them out Sunday to see if they feel better suited to the boat. They were designed and work very well as a final line of defense for ships, but are a far cry from a prefered weapon against fast attack vessels.
Interestingly, in the last race , as poor as we did, we beat a couple of double sliding seat boats. The end of the pipe that dips into the water has the typical male tapered thread on its end; which I cut eight slits in with a hacksaw. Able to fly a hull upwind or reaching for performance, but only enough to clear the water, no risking it here, mainsheet in hand? meaning also one hull supports full displacement. When we row Sunday, we'll take along some fishing gear and see if we can catch some early Striped Bass up in the North River. As the female coupler is tightened on the end of the male pipe it collapses the pipe and acts like a collet which in turn holds the exercise bike down tube securely. At first I thought this shelf was an eyesore, but I believe it would look fine now and be extremely functional. In the attached picture you will see a chromed down tube pipe sticking out of the end of the black pipe. This down tube is actually the metal tube from an exercise bike that goes from the seat to the crank housing.
Once I got the assembly tight and aligned I cross drilled thru both pipes and added a bolt and nut to secure everything so it would not shift.
The smaller lower sprocket is off a snow-blower shaft chain drive and has been cut thin enough to allow a bike chain to run on it.
I then used some shafting to mount the smaller sprocket and go thru the bearings and then mounted the propeller.
I also added some wood to the bike legs to aid in mounting this contraption on my raft's deck. Using cheapie ball bearings is a must as they are loose enough to allow the water to enter and lubricate them. After each usage they have to be removed and oiled and then dried out before reassembling them or they?ll rust up solid.

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Comments to «How to design a fast boat videos»

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