The Mid-Harbor 26 Motor Launch hull is molded in solid Fiberglass Reinforced Plastic with a vinylester skin layer and full length longitudinal foam cored stringers. The interior deck and seating are a single mold in FRP with balsa coring. All deck, step, and seating areas are molded non-skid surfaces.
Engine mounting brackets are through bolted to the stringers. The engine, transmission, shaft coupling, battery/battery box and high water alarm are installed under a FRP, sound-proofed engine cover vented with a closable fitting. The fixed fire system is also located in this space. The cover tilts forward for maintenance and inspection access. A fiberglass drip pan is installed under the engine. The wet exhaust and muffler are installed on the port stringer and exit through the stern.
All engine controls, gauges, alarms and emergency controls are located on the console at the operator's station. Steering is by a vertical tiller with a push-pull cable linkage to the rudder arm. Rudder and post are stainless steel.
A deck hatch is provided for maintenance and inspection of the shaft tube, drip-less packing, fuel tank and fill and primary bilge pump. This hatch is exposed by tilting the deck box containing the life vests aft.
Decks are drained into the stern sump area through two 2" x 6" drains connected by 1 1/2" hoses. An automatic bilge pump in the stern sump and a primary bilge pump in the keel area discharge overboard through the starboard side.
Stainless steel handrails surround the passenger deck on the coaming. A custom made, stainless steel, safety handrail is installed at the boarding step. LED safety lights are installed to illuminate the step and deck at night in the passenger areas.
MACHINERY INSTALLATION
Propulsion
The vessel is to be powered by a 75 HP Yanmar diesel, Model 4JH3-TE, with a continuous SHP output rating of 69 HP @ 3700 RPM (120 ft-lbs of torque) mounted to the longitudinal stringers on aluminum beds. This is coupled with a Velvet Drive gearbox with a 1.9:1 gear ratio. The gearbox is joined to a 1 3/8" diameter stainless driveshaft through a DriveSaver coupling.
The driveshaft is carried to the stern bearing in a 5 ft. x 3 1/4" O.D. shaft tube sealed with a standard speed P.Y.I., pack-less shaft seal to turn a 16" 3-bladed, bronze propeller.
Control of the engine and gearbox is through cables from a Kobelt singlelever control, Model #2406, mounted on the top of the operator console. Engine start/stop and monitoring is by a Yanmar digital type-c panel including ignition, engine stop, oil pressure, coolant temperature, tachometer, and attenuator panel with visual and audible alarms.
Raw cooling water is supplied by a single 1" bronze thru hull with screen, a UL Listed bronze seacock and connected to a bronze strainer with a stainless steel basket.
Exhaust
The single exhaust, from the 3" diameter mixing elbow on the engine, is a Centek Fiberglass Wet Muffler with Shieldsflex II, Series 200, marine wet exhaust hose with stainless T-bolt clamps. Running aft, the same hose type is used to connect the muffler to the Centek Thru hull exhaust fitting, with rubber flapper valve located 4" above DWL in transom.
Steering
Steering is by a 40" vertical tiller pivoting on a 1" stainless waterproof bearing with an 8" arm. The tiller and 6" rudder arm are connected by a push-pull cable with 3/8"diameter spherical rod ends and rated at 150 lbs. push, 1000 lbs. pull.
Electrical System
The electrical system is a standard 12 volt marine system using a Group 24 wet-cell marine battery, with the positive wired through a battery isolation switch to the engine starter and a fuse panel in the console. Battery cables to engine and isolation switch are 2 AWG marine assemblies, with a 10 AWG connection to the fuse panel and negative buss. All wiring is marine grade minimum 14 AWG, copper, stranded, with 105°C insulation, UL listed, and color coded per AYBC Standards. All alarms are located at the operator's console. All wire connections are appropriately sized crimp-on rings, with adhesive, waterproof shrink tube. Wiring is labeled for ease of maintenance. Two waterproof rocker switches on the console activate the running lights, and the courtesy lights in the cockpit.
Lifesaving and Safety
Life Vests – Type 1, with reflector patches, 25 Adult and 3 Children. Storage is in two locations, the majority in an opening deck box on the centerline just abaft mid-ship, the balance stored in the bow.
- Ring Buoy – Type IV, 20" white, with integral web straps and grab lines, secured to the vessel with 60' of 3/8" UV resistant polypropylene line. Strobe Light – Automatic floating strobe light in a stainless bracket adjacent to the ring buoy, and attached to the buoy by a 6' lanyard
- Signal Horn – Portable, air powered.
- Fist Aid – Fist aid kit, general purpose.
- Emergency Anchor – 14 Lb Danforth-style, with 100' of 3/8" nylon line and 6' of quarter-inch chain stored in the bow compartment.
- Flashlight – Rubber case, waterproof, 2 D-cells stored inside console.
- Bilge Pump – Manual, 10 gpm and a 6' hose.
Fire Protection
- 1. Fixed System – The single, rechargeable, manual/automatic BC extinguisher, using 125 cubic feet of HFC-227 clean flooding agent, is installed horizontally inside the forward end of the engine cover with a manual discharge cable mounted on the operator's console. The Fireboy Xintex, Inc. Model #MA2-125-227 is coupled to an automatic engine shutdown system, Fireboy Xintex Model #ES-3000- 1, with discharge alarm and light on the console.
- Volume: Engine Cover (5' x 2.25' x 1.5') = 16.9 cu ft,
- Hull Cavity (16' x 2.8' x 1.8') = 80.64 cu ft, Total = 97.5 cu ft,
Note: No deduction was taken for the engine or fuel tank in this space. - 2. Fire Extinguisher – 10 lb. Class ABC, dry chemical agent, rechargeable with gauge, Kidde #PRO 10 TCM, mounted on a steel bracket under the operator's seat.
- 3. Fire Extinguisher – 5 lb. Class ABC, dry chemical agent, rechargeable with gauge
- 4. Emergency Fuel Shut-off – Manual pull cable, with tee handle on the console adjacent to the fire pull, connected to the fuel tank valve.
Fuel Tank
Fuel Tank – Single, 40 Gallon tank, 5052 aluminum construction, 1/2" fill, 5/8" vent, 1/4" pickup, 3/8" return, from RDS Mfg. with USCG Certification. Installed on FRP pads on center between longitudinal stringers, under the deck aft and accessed by separate hatch. Fill and tank are electrically bonded.
