| Copyright 2011 CONRAD YACHTS All Rights Reserved |
Hull Characteristics.
1. The hull can be best described as a modified constant deadrise form, the most
trusted and well behaved hullform ever developed.
2. Relatively high deadrise at transom(19 degrees), makes her much more comfortable
in sea way than the majority of boats this size, whose deadrise is generally in the 13 to
16 degrees range.
3. The innovative, variable width chine flats are wide aft, gradually narrowing from
amidships forward. The wide chine flats aft give the hull extra lateral stability, while
narrow chine flats forward, allowing the hull to move through the water, prevent
slamming against oncoming chop.
4. The hull itself is 20 feet long, 22 feet including the engine bracket/swim platform.
5. Using the engine bracket, instead of mounting the engine(s) on the transom, allows
the engine(s) to sit a bit higher and further aft of the end of the hull. This improves the
"hole shot" and allows the propeller to work in less turbulent water flow.
1. The hull can be best described as a modified constant deadrise form, the most
trusted and well behaved hullform ever developed.
2. Relatively high deadrise at transom(19 degrees), makes her much more comfortable
in sea way than the majority of boats this size, whose deadrise is generally in the 13 to
16 degrees range.
3. The innovative, variable width chine flats are wide aft, gradually narrowing from
amidships forward. The wide chine flats aft give the hull extra lateral stability, while
narrow chine flats forward, allowing the hull to move through the water, prevent
slamming against oncoming chop.
4. The hull itself is 20 feet long, 22 feet including the engine bracket/swim platform.
5. Using the engine bracket, instead of mounting the engine(s) on the transom, allows
the engine(s) to sit a bit higher and further aft of the end of the hull. This improves the
"hole shot" and allows the propeller to work in less turbulent water flow.
| Tuna 20 CC - #08 |
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1. All major hull structure components are designed and calculated to conform to the requirements of ABS
(American Bureau of Shipping).
2. The maximum beam is 8’-0". This is relatively wide for a 20' boat. Tuna 20 is a stable fishing or working platform.
3. Whenever possible, welds are avoided: entire cockpit sole(from the bow to the engine bracket) is made of only two
lengthwise halves, welded together, then welded to topsides(side plates) around the perimeter, and slot welded to
structural members underneath. Each hull half is one piece, so are side plates. This approach yields a much fairer hull.
4. The hull is framed longitudinally, which, again, produces a fairer hull, eliminating the "hungry horse" look of many
metal boats.
5. The structure consists of longitudinal girders and transverse frames, which “egg crate” into one another to make
assembly quick and accurate.
6. I believe in being able to access and remove the fuel tank, if necessary, even after the boat is completed. This is
accomplished by locating the fuel tank under a “soft patch” in the cockpit sole.
7. Alloys used are all top marine grade 5000 series.
Bottom - 1/4" - 5086 H116
Sides - 3/16" - 5086 H116
Cabin - 1/8" - 5052 H32
(American Bureau of Shipping).
2. The maximum beam is 8’-0". This is relatively wide for a 20' boat. Tuna 20 is a stable fishing or working platform.
3. Whenever possible, welds are avoided: entire cockpit sole(from the bow to the engine bracket) is made of only two
lengthwise halves, welded together, then welded to topsides(side plates) around the perimeter, and slot welded to
structural members underneath. Each hull half is one piece, so are side plates. This approach yields a much fairer hull.
4. The hull is framed longitudinally, which, again, produces a fairer hull, eliminating the "hungry horse" look of many
metal boats.
5. The structure consists of longitudinal girders and transverse frames, which “egg crate” into one another to make
assembly quick and accurate.
6. I believe in being able to access and remove the fuel tank, if necessary, even after the boat is completed. This is
accomplished by locating the fuel tank under a “soft patch” in the cockpit sole.
7. Alloys used are all top marine grade 5000 series.
Bottom - 1/4" - 5086 H116
Sides - 3/16" - 5086 H116
Cabin - 1/8" - 5052 H32
1. Transom height is 25”. Using the engine bracket, instead of mounting the engine(s) on the transom, allows the
engine(s) to sit a bit higher and further aft of the end of the hull. This improves the "hole shot" and allows the
propeller to work in less turbulent water flow. It is possible to use 20" leg motor, if preferred.
2. Recommended power for this hull is from 90 hp to 250 hp, single or twin installation.
3. Cockpit is self-bailing.
4. Filling the cavities under the cockpit sole with foam will make the boat unsinkable.
engine(s) to sit a bit higher and further aft of the end of the hull. This improves the "hole shot" and allows the
propeller to work in less turbulent water flow. It is possible to use 20" leg motor, if preferred.
2. Recommended power for this hull is from 90 hp to 250 hp, single or twin installation.
3. Cockpit is self-bailing.
4. Filling the cavities under the cockpit sole with foam will make the boat unsinkable.
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Specifications
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Pricing
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