The next generation in DPV technology - Logic Dive Gear Genesis 600/1240

[Jon Nellis]

For those following the Tahoe Benchmark testing this year you've probably read about and seen the pictures of the Genesis 600 and 1240 scooters from Logic Dive Gear (mislabeled by some as "Dive Logic") A project that has been under wraps and finally released to the world last week in Lake Tahoe.


This is the next generation in scooter technology and the specs and design features are listed below with a video of the scooter here.

[video=youtube;eufuhWX-ZjM]http://www.youtube.com/watch?v=eufuhWX-ZjM&feature=player_embedded[/video]

Magnetic propeller coupling - Eliminates the dynamic shaft, which requires regular/annual replacement and is the primary leak failure point.


Waterproof externally battery recharging connector - Eliminates tor need to open the scooter for battery recharging, reducing the likelihood of seal damage/contamination and water drips/humidity build up inside which can damage electronics. Also reduces wear on the battery connectors so they last longer. Next to the connector is a vacuum/pressure testing port for leak testing or removing pressure from body due to altitude or environmental changes


Environmentally sealed electronics section of tail cone. Should the body be opened and water dripped inside, the humidity cannot enter the motor/controller area.

Water cooled motor and controller - Motor is shrink-fit into the aluminum tail cone to provide maximum cooling, avoiding motor efficiency losses due to heat during long run times which can also lead to battery overheating. Controller heat-sink is also attached to tail cone for maximum cooling from the water.


Full variable speed - The speed can be adjusted with your thumb (separate from the on-off trigger) from zero to 100% while running and the gradual acceleration at start up takes you to the selected speed without a sudden jerk.


No stainless clamps to connect the body to the tail - Streamlines the flow into the nozzle and avoids galvanic corrosion due to dissimilar metals


600Wh and 1240 Wh Lithium ion polymer batteries (600Wh shown)

(Photos and video courtesy of Ben McGeever)

Maximum static thrust is around 80 lbs (actual test numbers to be posted soon)

-Hard anodized aluminum body.
-Depth rated to 600 feet (deeper rated units available special order).
-Weights - Genesis 600: 34.5 lbs, Genesis 1240 42 lbs.
-Recharge port can be converted to supply power for lights or other equipment with two different voltages (adjustable to any voltage) with optional power supplies.
-Optional inlet and exit screening.

Scooter demo days will be set up in the near future in Monterey and Lake Tahoe for anyone interested. Stay tuned for the dates!

 

[mikemill]

Congrats on bringing your scooter to TBM. I look forward to seeing the data and maybe taking it for a test run

 

[Jon Nellis]

Static thrust testing make-up day for the Tahoe Benchmark was today and I need to make a correction to my thrust estimate in post #1

Actual static thrust (aka, bollard pull) was ...

:Edit: ... to be released by the Tahoe Benchmark pending review. I apologize to James Flenner and the other manufactures for prematurely releasing the thrust numbers as I was not present at the meeting where an agreement was made not to do so. :End edit:



Also, the demo day at lake Tahoe is August 27. Dolphin SCUBA of Sacramento will also have scooters from Silent Submersion, along with side mount rigs and rebreathers from Dive Rite to try. Contact Dolphin for more info and to sign up.

 

[WolfY]

Looks very nice and promising. Good job.

1. Is it possible to connect 2 scooters together if 1 got his battery discharged?

2.Will you have a OPV and inlet valve combined with pressure gage, in order to create OP inside the scooter?
The reasons:
1. Visual leak check.
2. Increasing depth pressure resistant.
3. If will leak, connecting a LP hose (inflator hose for ex.) will help to surface with minimum damage.

 

[Jon Nellis]

1. Is it possible to connect 2 scooters together if 1 got his battery discharged?

No, the pins on the connector are not connected to the batteries unless the charger is attached. If they were, the pins would short out in salt water if the cover was removed. Besides, it would be a lot easier just to tow your buddy back.

2.Will you have a OPV and inlet valve combined with pressure gage, in order to create OP inside the scooter?
The reasons:
1. Visual leak check.
2. Increasing depth pressure resistant.
3. If will leak, connecting a LP hose (inflator hose for ex.) will help to surface with minimum damage.

Typically a leak check is done with a vacuum so the o-rings are energized in the proper direction, but the retention method between the body and tail cone is strong enough to take low pressure (10-15 psi) to perform a positive pressure leak check and look for bubbles, unlike the spring latches common on most scooters.

Theoretically, the inside could be compensated with gas for increased depth, but an LP hose off a standard SCUBA regulator would be too much pressure. Additionally there could be issues with the batteries under 300 psi of pressure when diving below 600 feet with the hull compensated.

Best regards,
Jon

 

[Mr.X]

Go Aggie! I look forward to seeing your innovative scooters out there!

X

 

[icestac]

How exactly do the strips hold the nose to the motor?

Thanks,
Jeff

 

[Rainer]

Some really innovative scooter design elements. Look forward to the TBM numbers. Congrats!

 

[Jon Nellis]

How exactly do the strips hold the nose to the motor?

Thanks,
Jeff

There is a groove in the tube and a groove in the tailcone that line up with each other when assembled. The square cross sectional strips are inserted into the aligned grooves, filling them both, and act just like a square key in a shaft/pulley connection to prevent movement. Internal pressure would put the strip into an axial shear loading situation and would theoretically require over 10,000 lbs to shear that length of strip.

It is an assembly method used on ROVs and numerous other sealed housing. ( I used to design large ROVs rated to 4000m)

While most people are conditioned to using latches to open/close their scooter when recharging the batteries, the idea with the external charge port is not to open the housing at all. Not opening and closing the housing repeatedly, greatly reduces the chance of damaging or getting dirt on the seals (if one is not careful) causing a leak and it also keeps humidity from building up inside caused by opening up a scooter that comes out of the water cooler than the ambient air temp, causing water to condense on the internals in high humidity environments. (e.g. warm tropical places with maitai's) That humidity can eventually cause corrosion on the internal components and work its way into the electronics and kill them. I've seen it happen and don't want to see it again.

Best regards,
Jon

 

[betti154]

There is a groove in the tube and a groove in the tailcone that line up with each other when assembled. The square cross sectional strips are inserted into the aligned grooves, filling them both, and act just like a square key in a shaft/pulley connection to prevent movement. Internal pressure would put the strip into an axial shear loading situation and would theoretically require over 10,000 lbs to shear that length of strip.

Hi Jon,

Very nice machine! It'll be cool to see the benchmark results.

With regard to the strip locking mechanism, if it's not a trade secret would you mind point me to a diagram or similar of this? I'm very interested in implementing something like this for a DIY canister light solution I'm working on.

Kind Regards,
Damien Siviero
Damien Siviero Photography