Riveted_Hull_Airboat_Specifications.pdf

ATTACHMENT 1

12 FT. RIVETED HULL AIRBOAT SPECIFICATIONS

GENERAL DESCRIPTION: The 12’airboat will be of the latest design of recognized manufacturer of airboats, designed for continuous operation in marshes, swamps, lakes, etc. It will be Aircraft riveted construction, to maintain a minimum of weight and maximum strength.

HULL:

1. The bottom of the hull shall be .100” thick 7075 T6 clad aluminum. Side shall be .100” thick 2024 T3 clad Aluminum. Transom will be .063 thick with 1 ½ x 1 ½ x 3/16 T bar riveted at bottom.

2. The transom is 9” deep in center extending outward 34” wide, turning upward at approximately 33 degree and rounding off to side of boat.

3. It will have (6) 1 ½ X 1 ½ X 3/16 T bar runners evenly spaced in bottom.

4. The rake seams will be welded to prevent corrosion or possible leaks.

5. The relief hole will not be less than (.441”) diameter at start of rake.

6. All angles, “Tee” bars and braces will be 6061T6 Aluminum alloy, all bolts, nuts, washers etc. will be stainless steel.

7. The bottom and side of hull will be joined with only 2 seams running from bow to stern to obtain hull length and width and depth.

8. Absolutely no other splicing on the hull bottom to assure hull strength and longevity.

9. The front deck will form nose roll and will extend aft. Approximately 36”.

10. The front deck structure will have 1 ½ X 1 ½ supports evenly spaced to support loads on deck.

11. The deck material will be 6061T6 x .063 thick aluminum.

12. The rear deck will be 6061T6 X.063 thick aluminum and will run from transom to approximately

45” forward to bulkhead and will be braced by Two (2) 1 ½ X 1 ½ X 3/16 angles spaced for front and rear engine stand mounts connected to transom and front bulkhead and bottom tee bars at rear engine stand mount.

13. An inspection hole will be in rear center of deck. The cover is to be constructed from decking material tap and bolted with proper sealing to under deck braces for a safely secure cover.

14. The outside of the hull will be etched by hand to preserve the alcad finish on aluminum then primed with a zinc chromate wash primer then coated with an epoxy paint to seal out the elements and prevent corrosion.

15. The bottom of the hull will be covered with the best (UHMW) green polymer (GXP) full length and 10” up each side without any seams.

16. The polymer will be stretched and riveted on the hull with #10 aircraft solid rivets.

17. The inside of the hull and the underside of decking will be sprayed before decking is installed with a zinc chromate wash primer which is also a self-etching primer then painted with acrylic enamel medium gray colored paint.

18. The rails of the hull will be 1 ½ x 1 ½ x 3/16” angle running full length of hull.

19. The hull will have a round (smooth radius) chine to permit easy turning in high dense grass.

20. An eye will be installed on bottom at the bow to accept hook on winch rope.

21. Gussets will be installed on all runners where they intersect with transom.

22. A bulkhead will be placed approximately 45” forward of transom to brace bottom and back deck and motor stand. All rivets used will be MS or AN 426 and 470 solid aircraft rivets in polymer and hull.

23. The front and rear deck will be .063 thick 6061T6 aluminum.

24. No architectural aluminum will be used.

25. Fuel tank to be mounted under rear deck with cradles and straps.

26. Two 1-2 inch drain plug holes and drain plugs will be installed in the rear of the boat on the port and starboard sides.

27. All bolts and nuts, washers, etc. will be stainless steel, except in engine stand where extra strength is needed.

28. All runners and rake seams will be sealed with a sealer which has proven to last many years in the type of boat, and which is resistant to oil and gasoline.

29. All electric Trim-plane will be installed.

30. Hull will be equipped with 60 psi, 1.8 GPM electric sprayer and 6.6-gallon tank for ease of running in adverse marsh conditions.

31. Hull will also be equipped with 1,500 gallon per hour bilge pump.

SPRAYER SYSTEM:

1. The sprayer will be made of solid 6061T6 Aluminum incorporated beneath the pull eye to prevent damage and prevent it from a possible clog.

2. A sprayer tank will be fabricated of .063 Aluminum with 1”x1”x1/8 angle welded for mounting under the front deck.

3. The tank will be powder coated gray.

4. A sprayer activation switch will be of push button and placed in top of the steering stick.

OVERALL DIMENSIONS:

1. 12’-0” Length down center line.

2. 82” Minimum width at widest point

3. 17” Height of transom at gunwale

4. 17” Height of sides and amid ship 15”

5. 60” up to 64” bottom width at rake relief holes

ENGINE:

1. The engines will be an aircraft type, 6 cylinder 280-290 H.P. carbureted, wide deck, Lycoming

0540 angle valve design.

2. Engine and magnetos will be etched with model number and description.

3. Overhauled to good airboat standards.

4. It will be equipped with alternator, oil cooler (The oil cooler is to be mounted above the engine), two impulse Bendix magnetos with covers, exhaust collection with stainless steel flex pipe, starter, fuel system, ignition harness, engine mounts, and all necessary equipment for normal operation.

5. During engine overhaul a complete list of procedure and work accomplished will be kept, disassemble, cleaning, inspection of all parts, etc.

6. A list of new and used or reconditioned parts listed which were used in the overhaul, to include crankcase, crankshaft, camfollowers (lifter bodies), hydraulic lifters (plungers), pistons, piston rings, bearings (main and rods), other bearings, gaskets and seals, rocker shafts, rocker arms, piston pins, piston pin rings, cylinders, valve guides, valve guides, valve seats, valves, valve springs, and any studs, exhaust etc., case studs, accessory case and will include accessories, overhaul of magnetos, starter, alternator, fuel system, and parts used new, used or reconditioned, in their overhaul.

7. This list will also state that the engine was test run.

8. At the end of this list, the words “I certify that the above information is true and correct” and will be signed.

9. The document will accompany the boat at delivery and will be turned over to the person accepting boat.

10. Due to the conditions the boat will be used in the following additional engine specifications must be strictly adhered to:

a) Cylinders-chrome barrels must not exceed manufacturers maximum service limits. Absolutely no cracks will be allowed in cylinder heads or exhaust ports.

b) Valve Seats-Must be replaced if ground too deep to produce a good valve face.

c) Exhaust Valve Guides- Must be replaced.

d) Intake Valve Guides- Not to exceed maximum service limits

e) Pistons- Must be replaced with new or not exceed service limits

f) Crankshaft- Must be closely inspected, if faulty must be replaced with new camshaft or reground to factory limits by a certified repair station, and yellow tagged.

g) Camfollowers (lifter bodies)- Must be new or reconditioned.

h) Oil Pump- Must be to factory specifications, impeller must be new

i) Knurling of valve guides or pistons will not be tolerated

ACCESSORIES:

1. Magnetos- Two impulse bendix magnetos

2. Starter- New Skytech or Dynastart type in good working condition

3. Alternator- Must be new GM Auto type with built in regulator not less than 50-amp one wire

4. Fuel System- Must be overhauled to good standards

ENGINE STAND:

1. The engine stand will be made of stainless-steel square or round tubing with a minimum wall thickness of .125 or 1/8” and will be mounted at front bulkhead and rear deck structure in (4) places with (8) 5/16 grade 8 bolts.

2. The engine will be mounted to the standby (5) mounting points to prevent any possible failure and allowing for the rear of the engine to be adjustable to properly trim the boats handling and performance.

3. The rubber (lord) and mounts (three-piece kit) will be used on each bracket.

4. Mounting brackets for lord mounts will be 3/16” 304 stainless steel plate welded in (5) places on engine stand frame with 7/16 bolt holes to accept lord mounts.

5. Engine stand will be sandblasted, and powder coated gray.

RUDDER:

1. The single rudder shall be Airfoil Type, aircraft riveted Construction, 3/32 rivets not less than 7.25” thick at the thickest point, 39.50” wide and 48” high, with spill plates to overhang not less than 1- 1/2” and will have two (2) ribs and four (4) spars evenly spaced and riveted inside rudder.

2. All material will be primed inside and outside with a zinc chromate wash primer. Pivot pins will be 1/2x2 stainless steel bolts welded to 3”x1/8” stainless steel plates, riveted to top and bottom of runner.

3. The outside rudder material will be .032 6061 T6.

LIGHTS:

1. The airboat will have LED lighting for night use with one white (clear) running light, one red and one green running light, and circular LED light mounted in forward section under seating to flood cargo space operated by bat handle toggle switches with rubber boot covers.

INSTRUMENTS:

1. To include oil pressure, oil temperature, ammeter, recording tachometer with engine hour meter, and electrical fuel gauge.

ELECTRICAL:

1. The boat will have (2) – 12-volt heavy duty batteries in marine type battery cases with perk double battery switch.

2. All circuit and wiring will be protected by individual circuit breakers.

3. Main battery feed to fuse block will have a 30amp circuit breaker inline.

4. Both batteries shall be mounted below front of engine just above front of rear deck in separate battery boxes.

FUEL TANK:

1. The fuel tanks will be mounted under rear deck and be welded aluminum not less than two baffles, 30-gallon cap, fabricated of .100 5052-H32 aluminum, mounted on cradles with rubber between tank and cradle with two straps.

2. Must have a minimum of 3/8” between bottom of fuel tank and top of runners.

3. The filler necks will be located on the left side of the tank.

4. The tank will have a 3/8” fuel pickup to rear bottom of tank and a 3/8” vent at the top of tank with an electrical fuel sender in the tank for fuel gauge.

5. Structural braces forward of fuel tank will be bolted to allow access for fuel tank removal and cleaning.

PROPELLER:

1. Boat will be fitted with a 74” Sensenich or Whirlwind propeller (2) blade to obtain optimal performance and longevity.

PROPELLER GUARD:

1. The propeller guard will be thin wall stainless steel (3) sizes 5/8-3/4-7/8 with .065 wall thickness, enclosed with (1/8) thick stainless wire and will cover entire cage.

2. The oil cooler will be mounted above engine in front of propeller.

3. Propeller guards will be sandblasted, and powder coated with gray.

4. Propeller guard, seat structure rear top ruder bracket will be of one unit.

SEATS & SEAT STRUCTURE:

1. The operator’s seat will be set 54 inches above the floor of the boat and 32 inches from the end of the front deck.

2. The operator’s footrest will be set 35 inches above the floor of the boat and will begin at the end of the front deck.

3. The accelerator will be mounted on the right side of the operator’s footrest.

4. A grab bar will be incorporated into the seat structure frame and will be mounted 4 inches from the end of the operator’s footrest. It will measure 35 inches in height and 18 inches outside width (16.25 inches inside width) with two angle support bars that are affixed to the end of the operator’s footrest.

5. The entire seat and grab bar structure will be constructed of stainless-steel tubing ¾” x .065 wall, 7/8” x .065 wall.

6. All stress points will be reinforced with 1/8-inch triangular stainless-steel plates.

7. The second two-man seat will be located six inches higher and 17 inches behind the operator’s seat.

8. The rear of the seat structure will be attached to the propeller guard and will not be attached to the engine stand.

9. Propeller guard, seat structure rear top rudder bracket will be of one-unit, lower rudder bracket will be stainless steel tubing and will be fastened to transom at three points.

10. Seat frames will be formed of stainless-steel tubing and the bottoms and back will be made of star lite marine material with 4” thick foam rubber pads covered with vinyl material by a professional upholsterer which will withstand prolonged outdoor use.

11. Plastic or fiberglass seat shells will not be accepted.

12. The seat structure, propeller guard and rudder brackets will be sandblasted and have a gray powder coat finished installed.

STEERING:

1. Steering will be left hand stick. The steering rod will be connected to the rudder by the appropriate length flex steering cable with grease fittings.

2. All bearings will have grease fitting including rudder pivots where flex cable will be used.

GRASS RAKE:

1. Solid type built of 6061 T6 x .063 sheet aluminum roll shape in front with hat channel bracing no sharp edges throughout. Rake shall also have an aluminum standing platform with storage and a hatch door all riveted construction.

2. Sides of grass rake 6061 T6 x .063 sheet with 1 ½ x ½ angle bent on top rail full length of rake.

3. The grass rake will be bolted every 12” across bottom and 1” x 1” x 1/8” angles made to fit front deck rail, bolted to rail and riveted to grass rake sides.

4. The entire rake will be hand etched and cleaned absolutely no blasting or acid cleaners. It will then be primed with zinc chromate primer and painted with acrylic enamel medium gray paint.

INSTRUMENT PANEL:

1. The instrument panel will be located on the right side of the operator’s seat where all instruments and all necessary switches to operate the boat will be mounted.

2. The following gauges must be installed: oil pressure, oil temperature, ammeter, recording tachometer with engine hour meter and electric fuel gauge.

3. The instrument panel will be powder coated gray.

TRAILER:

1. Aluminum Frame (Galv or Aluminum Material), 3500-pound heavy duty torsion axle tilt frame trailer for 12’ airboat with spare tire and mounting bracket, swing away tongue jack, winch, and roller on back of trailer.

2. The trailer will be equipped with 2” hitch, safety chains, winch, winch cable, hooks, wheels galvanized or aluminum, 4 ply tires and 14” wheels, and bearing buddies.

3. The trailer will also include 4 running pads and 2 side boards (guide rails).

4. The trailer must have (4) 2X6 pressure treated wood placed 24” on center and outside boards 12” on center to support weight under the boat, indoor outdoor carpet must be installed on the 2X4 side boards and bottom boards, mounted spare tire, fenders, and lighting system to include taillights, stop lights, turn signals, and amber clearance lights.

5. Spare tire mounted on trailer and this trailer must fit boat.

TESTING:

1. The completed Airboat will be test run to ensure that all components are functioning properly at delivery prior to the boat being accepted.

The boat will be tested for water leaks.