Consult your ASIS dealer regarding a
suitable trailer as there are numerous considerations to take
into account to make the correct selection. The trailer should
comply with local regulations and may require an independent
breaking system dependant on the total weight of the boat and
trailer. The beam of a boat exceeding a certain width is
considered a ‘Wide Load’ and requires special placarding. ASIS
boats being much lighter than fiberglass or aluminum boats of
similar length generally require a smaller more economical
trailer system. Full inflatable have carpeted ‘runners’ while
RIB’s require load bearing nylon rollers supporting the keel
and carpeted runners supporting the chimes in a level attitude.
Beach launching trailers have a split pivot system to allow the
bow to be scooped up and guided by rollers into the centre
Visual Boat Check and Briefing
Check Bung is in place and fully tightened.
Check Tube Perimeter and test air pressure.
Check for Tube Inflator (Pump) and adapter plugs to
Check Safety Equipment on board and all items
Check boat keys, locker keys, kill switch and test
Check for paddles and tow roap.
Brief crew and passengers by explaining the
location and use of all PFDs to passengers and crew especially
passengers that may be new to the vessel. Children, elderly and
passengers that cannot swim should always be wearing PFD’s.
Also explain routing and basic emergency procedures and
distress call procedures.
Personal Flotation Devices (PFDs)
Have at least one Coast Guard-approved device per
passenger and a minimum of two on board.
An additional throwable device is required if the
vessel is more than 16 feet long.
Explain the location and use of all PFDs to
passengers and crew that may be new to the vessel.
Sound Producing Devices
Have a horn capable of producing a four-second
blast audible for at least 1/2 mile on board.
If you use portable air horn, have a spare can of
air or an alternate device.
Attach a whistle to each PFD.
Lights and Shapes
Have all navigation lights as required for your
Make sure all instrument lights are working.
If you intend to engage in a recreational boating
activity that requires a day-shape, have the
Have aboard a flashlight and spare batteries.
Make flares, day signals, etc., accessible and
ensure they are stored in a dry location.
Carry signals at all times even if not required by
the Coast Guard.
Inform the crew and passengers of their location
and safety rules for proper usage.
Tools and Spares
Carry a basic toolbox with tools appropriate for
Carry a box of spares including fuel filter, light
bulbs, head parts, through-hull plugs, etc.
Fuel and Oil
Top off your fuel tanks.
If you can't, have enough fuel to provide a
reasonable margin of safety for your return.
Check the engine oil and coolant levels.
Carry at least one fire extinguisher and make sure
it is accessible. Make sure you have at least the
number required by Coast Guard rules.
Check to be sure mounts are secure and functional
Take the time to point out locations to passengers
If fuel smells are detected before ventilating,
check after running for several minutes before
If odor persists, shut down the engine and look for
the source of the leak.
Check to be sure bilges are reasonably dry and that
pumps are not running excessively.
Clean up any spilled oil or waste in bilges to
prevent overboard discharge.
Always check the weather forecast before boating.
Have a radio on board to receive weather updates.
If you have a dual charging system, make sure the
selector switch in the proper position.
Make sure the power is on to the entire vessel.
Have aboard spare batteries for accessories such as
your handheld radio, flashlight, portable
navigational aid, etc.
If the batteries are rechargeable, make sure
Docking and Anchoring Tips
Have at least one anchor set up and bent-on to your
Carry two or three extra dock lines in case you
encounter unusual conditions dockside.
Visually inspect the lines you use for chafe or
Carry at least a fenders on-board for docking or
towing if required.
Rules & Documentation
Have the ship's papers, radio license, fishing
permit, etc. on board.
Have the chart or charts for the area you intend to
cruise in, regardless of your level of local
ASIS boats are manufactured to meet the
highest standards specified for safety on water.
Consideration and pre-launch checking of the
following will ensure the safety of all concerned.
Check the condition of your boat.
All participants are equipped, trained and prepared
Carry all specified safety equipment.
Plan and equip for variable conditions.
It is the duty of the Skipper of the boat to
carry the appropriate safety equipment for the trip with the
ability to deal with the following conditions.
Man overboard (MOB) situation – Requires
carrying of personal floatation equipment, PFD’s, a ‘lifeline’
to throw to the (MOB), and passengers should be dressed to
minimize hypothermia. ASIS consoles have dry and wet storage
areas and tubes can be fitted with ‘Pouches’ to carry safety
Fire at sea - an appropriate fire
extinguisher should be fitted. ASIS consoles can be ordered
with recesses for fire extinguisher bays.
Fuel flow breakdown or loss of propulsion
can be prevented by checking tanks, filters and lines prior to
launching, in the event of power loss at sea check the above
and clean or replace where necessary. Oars, ground tackle, sea
anchor and signaling devices should be carried as they may be
required. Carry a safety grab-bag containing signal flares, ‘V’
sheet, heliograph mirror, torches, and sunburn barrier, insect
repellent and thermal blankets.
Injury at sea. Carry a first aid kit, and
CPR manual specifically related to the activity.
Electrical problems. Battery condition and
location of all fuses should be known to the skipper. Marine
wiring can be isolated using a battery isolator switch and a
series of inline fuses and switches for each electrical
circuit. ASIS consoles are designed to provide mounting
solutions for all necessary gauges, wiring, switches and fuse
Water leaks or ingress – If water
unexpectedly enters the boat, bale the water overboard using a
bucket, electrical or hand pump after checking to ensure the
drain ‘Bungs’ are in place.. ASIS boats have self bailer system
which will self drain the deck if you are in a forward
Weather Conditions – As conditions at sea
vary be sure to get a forecast that deals with changes in sea
conditions or reschedule your trip accordingly. Consider
personal requirements to protect against cold, rain and sun as
well as sufficient water and food.
Information Resources – Check with your ASIS
dealer as well as Local Authorities regarding local
requirements and seamanship practices. Experienced ASIS staff
and dealers have a wealth of information; feel free to talk to
Regular Inspection – Regular unscheduled
inspection of your ASIS hull and tubes in transit by trailer
and before launch are beneficial. Pre-departure check for signs
of storage damage and continuously check during road transport
to ensure that no damage is being inflicted by trailer tires.
High fuel odor must always be traced to determine the source
Pre-Launch Passenger Briefings – it is
essential to inform all passengers of the safety rules to which
they are required to comply; they should also be shown the
location of PFD’s (personal floatation equipment) and other
safety equipment on board or inside the ASIS console.
ASIS trailer launching consists of
pre-determined steps in preparing for the launch, care and
consideration should be given to additional differences at the
launch site and the duties and actions required by the launch
personal must be conveyed by the skipper prior to
Stop clear of the boat ramp in the level
preparation ready area. All equipment must be transferred and
secured in place in your ASIS boat taking care to ensure that
the recommend payload is adhered to. Passengers must be safety
briefed and checked to ensure personal comfort and any specific
needs of passengers including clothing for warmth and comfort.
Passengers are to stand aside while the designated trained
launch crew remove all tie-downs between the trailer and the
stern, and then remove the safety chain at the bow. With the
ratchet on and the primary winch cable in place, check that the
bungs are in and tight. Make sure the fuel is connected the
electrical power is switched on from the primary battery switch
and the engine primed, remove engine locks and chocks and set
engine lock out switch to ‘run’. Insert the ignition key and
check the ground tackle is accessible and can be deployed
quickly if required. Check that the propeller is clear as well
as the bow & stern mooring lines are secure and accessible.
Walk down to the ramp and assess any VARIABLES such as ramp
width depth, and slipperiness, tidal currents, angle of the
ramp, submerged hazards, wind and boarding location for
passengers. Return to passengers and check their readiness to
board and advise boarding location.
Each trailer has an optimal depth for launch
and for recovery, this is with the stern roller or guide just
below the water level. Having the stern roller guide deeper is
not better as the boat will tend to separate vertically rather
than slide back onto the rollers. A crew member should be
placed as observer, at the driver’s side of the ramp with a
clear view of the launch area and clearly visible by the
driver. In 4WD clear the area visually then reverse at a
constant slow pace taking note of any hand signals by the
observers. Stop the vehicle at the pre-set launch depth. With
the observer standing downstream, if any current or wind is
present, secure the bowline in hand, release the ratchet and
release the primary winch cable from the bow to trailer.
Holding the bowline, push the boat off and allow it to slide
clear of the trailer. Assist the observer to secure the boat to
the shore before driving away. In unstable conditions of wind
or current the skipper should board the ASIS and remain at the
controls, starting the engine before releasing the bowline.
Secure the winch cable onto the trailer. drive clear of the
ramp and park the trailer.
ASIS recommends that safety be the primary
consideration in all your boating activity. ASIS boats are
manufactured to exceed Lloyds Specifications for materials in
all aspects of construction, design and buoyancy. It is
therefore incumbent on the owner and the operator, to equip any
ASIS inflatable boat with all necessary SAFETY equipment
relative to the conditions and the nature of the operation
being conducted. Over and above the requirements of local and
international maritime law, it is the responsibility of the
Captain of the vessel to exercise his Duty of Care in the safe
and sensible operation and take all reasonable steps to ensure
the safety of crew and passengers at sea. All manufacturers’
placard limitations must be adhered too in full. ASIS
inflatables should only be fitted with accessories approved by
certified ASIS dealers, in a manner which complies with
practices laid down by ASIS. Boating safety is the
responsibility of every person engaged in boating, and every
person boarding a boat must take a pro-active attitude to learn
and understand the factors which may affect their personal
safety at sea.
ASIS asserts that coastal navigation is a
skill acquired by practical experience as well as the
assistance of a compass which when fitted should be checked for
inherent deviation with the deviation correction card being
placed next to the compass. Your ASIS Dealer will be happy to
inform you about the deviation as well as any suitable
navigation courses available.
Skippers should ensure that they have at
least two navigation methods available in order to cross check
one against the other while eliminating user error. Despite the
High accuracy of GPS it is susceptible to user error and a
second confirming navigation method will always prove
Official marine charts should be carried and
the traditional dead reckoning (DR) should be observed
recording departure times as well as direction and course data,
in addition to GPS navigation data. Tidal prediction charts
should be studied to ensure safe passage in shallow waters.
ASIS have the knowledge and experience to
provide protection to maps and instruments as well as
windscreen design and console layout for optimum ease of
operation during navigation.
Number of blades:
Well., two is really the practical minimum.
Two blades are also very efficient. As more blades are added,
efficiency drops, but so does vibration. Three blades is pretty
well the standard, with fours, fives and sixes used in
specialized installations, such as racing.
Another simple one. It is the outside circle
made by a rotating prop.
A little more technical this one. In a
perfect world, with no losses, pitch is the theoretical
distance your boat would move forward for one revolution of the
prop. Along with diameter and material, there are usually
variables by which you select a prop. (More of that later.)
The familiar 'Mickey Mouse's Ear' shape for
a prop blade is not the only one available. Contour is the
blade shape, looked at along the shaft axis.
Consider the cartoon artist drawing Mickey
Mouse. If Mickey suddenly accelerated, the ends of his ears
would be drawn stretched back. That is positive skew. Negative
skew would be his ears overshooting when he stopped. Large
amounts of positive skew help shed weeds and allow cleaner
entry for a blade that breaks the surface.
They rake if they're being drawn back by the
forward speed of the boat. So, instead of a flat arc for the
blades to rotate in, an overall dishing effect from hub to tip
produces a cone. Zero rake is a flat disc, flat rake is like a
Chinaman's hat and curved rake is like his wok! Rake helps
reduce cavitation and ventilation. Because of the props extra
grip, the front of the boat will lift more, a problem for light
The trailing edge of the prop blade is
usually turned away from the boat slightly. This is cupping.
The amount can be tweaked to fine tune your peak RPM. Cupping
produces similar benefits to Rake and adjusting it should be
left to the experts.
The material your prop is made from has a
great effect on your choice. Plastic is cheap, but flexible and
prone to serious, as in throw away, damage. Some `plastic'
props get around this by having replaceable blades. This also
allows easy pitch changes. Next, and probably the most common,
is aluminium (alloy). These give good service at a relatively
low cost. Repairs can be made to minor blade `dings' making
this a good all round working prop. Stainless steel is the
choice for the more serious performance user. Stainless props
are harder wearing and grip better due to less distortion. They
are also much more resistant to damage due to ventilation and
cavitation. On the down side is the higher initial cost and
greater mass. The cost factor is straightforward. The extra
mass means harder loadings on your gearbox. With more weight to
kick into life, the drive dogs in your gearbox take more of a
battering. Also, more energy is stored in the prop so that
changes of throttle setting again produce additional loading
and gear train.
Ventilation and Cavitation:
The outcome of both of
these is very similar. the prop loses grip, your engine
revs rise (with the associated roar) and forward thrust
The cause for the two problems is very
different. Ventilation is air from the surface or exhaust
getting drawn into the prop. Cavitation is water vapour boiling
out and again reducing the ability of the prop to thrust
correctly. when the vapour condenses, the resulting implosion
erodes away the metal of the blade (cavitation burn).
Ventilation can be greatly reduced by a
plate built into the drive leg (often wrongly called the
cavitation plate) and a slight flaring of the hub to reduce
exhaust feeding back into the prop. Cavitation is most likely
due to poor blade design or blade damage. The solution is