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| Conrad Chum 18' - sport utility boat. |
| Specifications: Hull length Beam Draft - hull only Draft - with engine down Deadrise at transom Transom angle Minimun cockpit depth - no rail Fuel capacity Standard power Capacity (people) Aluminum weight Design displacement |
18 feet 8 feet 12 inches 29 inches 18 degrees 12 degrees 25.5 inches 60 gallons 70 HP 6 1500 lb 2170 lb |
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| Pricing: * CNC(cutting file), including assembly drawings and parts list: - $500 Canadian. * Building kit: - $10,300 Canadian. * Welded out boat: -$13,900 Canadian. The building kit includes: - All plate parts, cut and formed; it does not include tubing, cleats etc. - Assembly drawings. Parts are cut with water jet or high definition plasma; intersections lines are etched on parts . Shipping extra. |
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| Reversible seat |
| The main features of the CHUM line of sport utility boats.
Hull characteristics. 1. Relatively high deadrise at transom(18 degrees), makes her much more comfortable in sea way than the majority of boats in this size range, whose deadrise is generally in the 10 to 16 degrees range. 2. Chine flats are 8� wide aft, gradually narrowing to 2� forward. The wide chine flats aft give the hull extra lateral stability underway, while narrow chine flats forward prevent slamming against oncoming chop. 3. In transverse section, chine flats are horizontal throughout. Some people claim that down turned chines make the boat drier. This can be so only under rather specific conditions(flat calm water); most of the time it will make the hull pound more and wastes engine power(when water hits a down angled chine flat, it is actually deflected forward). |
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| Construction.
1. The maximum beam is 8�. This is done to enable major hull parts to be cut out of single, standard size(easier to get and thus cheaper) sheets of marine grade (5086 H116) alloy. For example: both side plates fit on one 0.190�X240�X72� sheet. The same goes for bottom, chine and transom plates: 0.250�X240�X96�. 2. Whenever possible, welds are avoided: cockpit sole is one piece, welded to topsides(side plates) around the perimeter, and slot welded to structural members underneath. 3. Hull structure consists of longitudinal girders and transverse frames, which �egg crate� into one another to make assembly quick and accurate. 4. Thanks to incorporating the grab rail, the gunnels can be made of one piece, even though they have double return, break formed flanges. The shape of the sheer is thus surely defined by the forward locker, the gunnel, and the aft cockpit wall, again, to make assembly easier. 5. I believe in being able to access and remove the fuel tank, if necessary. This option is provided by locating the fuel tank under a �soft patch� in the cockpit sole. The console and the driver�s seat are welded to the �soft patch� and the whole subassembly through bolted to main hull girders. This arrangement is optional. Conventional arrangement, fuel tank welded in for good, is possible. Function. 1. Transom height is 20�. It is possible to order the design with 25� transom. 2. Chum boats come in three hull lengths: 18, 20 and 22 feet. 3. Recommended power for the 18� boat is 70HP(top speed around 30 mph.) 4. Custom alterations will be considered (additional and/or different configuration of lockers or seating). 5. The Chum hulls are designed with 4stroke(somewhat heavier than 2 stroke) engines in mind. 6. Cockpit is self-bailing. 7. The Chum 18 boat complies with Canadian Coast Guard regulations for vessels under 20�. |
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