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On Sat, 3 Feb 96, Carl Heinzl <cgh@ma*.ai*.mi*.ed*> wrote:
>
>What's the REAL operational depthlimit of these DV100s??? How much
>faster is faster and how much longer burn time is longer?
>
They will hold to the 180 range once in a while, but usually
extrude the o-ring around the lid. The real problem below 120
is the stress on the internal fins and lower bulkhead casing.
If that cracks, hydrogen gets into the motor compartment. This
is why so many dv3x's blow up - the bulkhead on those is a real
lightweight. I do not like to take mine below 150 feet, and
usually do not plan a dive with one below 120.
Burn time is a funciton of the drAw and battery . On speed
9, the 3X draws 11-12 amps, the 100 14-16. The battery curve
at one hour multiplied ny .7 divided by the draw will
give you the approximate burn time. The 3x with 18ah Yuasa or
the new Powersonic will give 70 minutes, or 49 for the 100.
As you back it off, the burn extends dramaitcly as you are
using less percent "C" which gives a better yield. At speed
1 on a 3X, you could go over 100 minutes. At speed 4 on a 100,
you can get 70 minutes. I have tested these using accurtes amp
flow meters with static loads, and then matched the loads with
a resistor set and timed it. Not to mention the fact that I have
put every cobination of these results to actual tests repeatedly.
The only batteries for which you need no factor are Sanyo's,
which are rated at a one hour rate, but we are talking 1500 a
set.
SPEED - is a relative thing becasue of the differences in
gear config. Relative speed is easier. The DV100 on 4 is the
same as the DV3x on 9. The propblem is that you do not always
get the speed pickup if you are inefficient, but you do use
the energy. With multistge diving, you must actually turn
the scooter's pitch down to get the better speed, the reason
that Aquazepps are so poorly suited fot extended range diving.
I have found that we can get 180 feet per minute fully loaded
with a 100, and 140 with the 3X. Top unloaded speed is in the
220 feet per minute range, and worst is 120. We (WKPP) plan to
net out 150 feet per minute including all stops , line laying,
surveying, etc. When we need to, we can push that figure closer
to 200 feet per minute if necessary, but then the chance of
errors gets high (like switching on the fly). We generally
only get speedy on the way out. We are using giant batteries
that never get close to burn down , however, and act like
a constant voltage source on a traction motor (like a train
motor is run).
>Of course the all important question is... how much $$$ ??? ANd, will
>I be happy with this or should I just save $ (or is that $$$$) for one
>of YOUR scooters?
You can buy new scooters from Oceanic for 1400. I would suggest
that if there are folks out there who have a good 3X, but would
like to add 11 pounds of buoyancy and have a removable lid and
all the amenites of a DV 100, send me the 3X and I will rebuild
it as a 100 for 400. This will save me a motor and parts, but will
get you what you want. I rewind the motors and use the basic
parts in my scooters. Since breakage is a problem with the
constant use, I need to save all of the parts I can, like shround
and handles which are especially vulnerable to damage in transport.
>What's the main difference between these scooters and ocean scooters?
Ocean scooters have little bodies and are white , and are made
to float. They have heavy lifting points on them.
- George
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