UPDATE 12/12
ADVISORY: prepare a dedicated charging area that is cleared of any flammable
materials or other equipment; do not charge the scooter in or attached to a dwelling
with sleeping occupants, and ensure you have a functioning smoke alarm where the
scooter is stored.
Charging scooter:
Charging of the scooter must always be done under supervision. Do not leave the battery
pack charging unattended. Always charge the scooter away from any flammable
materials. Do not charge batteries after any mechanical damage.
To charge the scooter, simply remove the hull of the scooter, disconnect the motor from the
battery pack, and plug in the charger to the battery pack. (There is a separate connecter for
charging). Once the charger has changed color from the charge color to the fully charged
color, leave the charger connected to the battery pack for an additional 30 minutes to 1 hour,
to ensure a good balancing of all the cells. DO NOT leave the charger connected to the
battery pack once this charge process is complete.
We recommend you purchase a Watt's Up meter or utilize a volt meter to determine the state
of charge of the battery pack. 23volts= low charge. 25 volts= half charge. 28.5+ volts = full
charge. Volt readings can be taken from the battery connecters.
Charge time: up to 15 hours.
Diving scooter:
We highly recommend a DPV instruction before DPV use. Unintended powered ascents can
lead to decompression sickness. The Viper is a high performance DPV and should not be
taken on any demanding dive until you have full acquainted yourself with it's operation in a
controlled environment.
To dive the scooter, with the hull removed, attach the battery pack to the motor electronic
speed control (large red/black connecters). Be sure there are no obstructions in the propellers
Check that the scooter will start by rotating the trigger. (It may take 1 second for the
electronics to “turn on”.). If the scooter does not start, try disconnecting and then reconnecting the battery pack.
With the VENOM electronics in the VIPER scooter, it is not necessary to disconnect the
battery pack from the controller to prevent battery discharge... the VENOM controller goes
into a “sleep mode”. However, it is a good idea to disconnect the controller whilst the scooter
whenever it's not in active use for safety purposes, to prevent the accidental activation of the
propellers in storage or transport.
Once the battery pack is charged, and plugged into the motor, install the hull and nose cone.
Be sure the nose cone is not obstructed by any objects on top of the battery pack, such as
trim weights. Obstructions can cause the scooter to flood as it can prevent the nose cone
from sealing correctly.
To check the the scooter o-rings will seat correctly, you can remove the lower o-ring, replace
the hull, then use the loose o-ring as a gauge... the o-ring should not fit between the sealing
surfaces at any point around the hull.
Entering the water:
Be sure that all 4 main hull clips are secured. (It's a good idea to re-check this on the last
deco stop, as the scooter will only leak at the surface if a latch is unsecured. At depth, the
pressure keeps the scooter sealed.)
Before placing the scooter in the water, set the variable pitch adjustment knob (in the center
of the propellers, at the very rear of the scooter) to a low setting. #5 is a good start. Also, lock
off the thumb screw which is on the left hand side of the trigger/handle. This will prevent
unintended scooter starts whilst lifting the scooter.
Do not place the scooter half in and half out of the water. Place the scooter completely in the
water, and observe the scooter for at least 60 seconds, looking for any leaks. If the scooter is
floating, but starts sinking after a time, and/or any bubbles emerge from the O-ring areas, the
scooter is leaking.
Starting off:
The VIPER has 2 methods of speed control, electronic and mechanical which together allow
almost any speed to be achieved between the minimum and maximum speed.
The mechanical speed control is achieved by adjusting the pitch/angle of the propellers, using
the pitch adjustment knob at the end of the propeller/hub assembly. There are small white
position indicators on the end of the propeller assembly. The mechanical control can only be
adjusted while the scooter is “off”. It can be adjusted during the dive at any time the scooter is
turned off. We recommend setting the pitch to #6 or #7. (Maximum speed will be achieved by
setting pitch to #9).
The electronic speed control is actuated via the trigger on the handle of the scooter. There are
3 electronically controlled speeds. When you first turn on the trigger, the scooter starts off on
speed 1. On your 1st dive, get used to this speed for a few minutes, and adjust the tow rope,
and tighten the sliding knots, before attempting the use of speed 2 or 3.
Once speed 1 is engaged, turning the trigger off and back on quickly (<0.5 seconds) shifts the
scooter up 1 speed. To obtain top speed, To go down a speed, you must let off the trigger for
1 second, and the speed re-sets to start off on # 1. You can click the trigger quickly 2 or 3
times and the scooter will skip speed 1 or 2 and go directly to you chosen speed.
During the dive: We recommend to use speed # 3 only when you need it, but not 100% of the
time on every dive, as it cuts down your run time by at least 50% compared to speed #2. (It
could also shorten the life of the battery pack)
For the majority of your dive time, USE ELECTRONIC SPEED #1 or #2 TO OPTIMISE THE
Matching speeds with your dive partner: We recommend matching speeds on Electronic
speed#2, which is your cruise speed for technical diving. Have the faster diver start off at a
medium pitch setting (eg, #6 or 7) and the slower diver can then set his scooter to run on
pitch #8 or 9.
General notes:
Be careful when disconnecting the motor from the electronics, as the wires can be broken.
(requiring new electronics)
When installing the hull, be careful that all wires kept inside the hull.
Opening the battery canister voids all warranty on the battery pack (at our discretion). The
battery pack is high voltage (29 volts) so use caution at all times.
Plugging in the electronics with the wrong polarity will destroy the electronic speed controller
(and possibly the battery BMS)
Minimum recommended propeller pitch setting #5 (lower setting produce cavitation/prop stall
at high rpm's) If you want to go slower, use the electronic speeds.
Venom electronics (as opposed to the Minnus/Magnus electronics) do not drain the battery if
left connected to the pack. However disconnecting the pack from the electronics ensures the
scooter can not be inadvertently activated so is recommended for this reason.
Storage temperature is important! High temperatures will shorten the life of the pack.
It is sometimes recommended to store lithium battery packs at approximately 50% state of
charge. However, we do not recommend any complicated procedures to store the pack at an
exact voltage.
Our first recommendation is to charge the pack to 100% if you plan to use the scooter in the
next 10 to 30 days. This will prevent last minute disasters if you forget to charge your scooter
the night before the next dive!
For longer term storage, a rule of thumb would be the check the voltage after a dive. If it is
above 26 volts, don't charge it, store as is. Do not bother trying to discharge the pack if it's full
charged, it's not worth the effort, and you might end up damaging the pack inadvertently. If it
is below 26 volts, you should charge it up to approx 26 to 27 volts. This requires you to
monitor the voltage at intervals during the charge. Nevertheless, storing a pack at 100%
charge is not very harmful. If you plan to use the scooter often, I would charge it to 100% after
each dive.
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