[PSUBS-MAILIST] SeaQuestor progress

[David Colombo via Personal_Submersibles]

Hi Cliff, I actually have a combinatation of variable ballast. I have
assumed a front pilot weight of 200lbs in my design. For increased weight
above the 200 I have a system simular to the snoopy with the trawler floats
that I can add. For lesser weight I have a rack design to recieve dumbell
type weights that would be added under the pilot seat that can be easily
adjusted for different passengers. In addition to the internal trim weight,
which is a sliding rail system. I have also decided to reserve one mbt
located at the cg line to be controlled independent of the other mbt for
the additional control if I need it.
David

David

On Thu, Jan 17, 2019, 5:31 PM Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Still not clear on your Variable Ballast setup.  What you describe is trim
> system with a 100 lbs weight that you can move longitudinally  much like I
> use on the R300.  This will affect trim of boat but not buoyancy.  I am
> assuming you plan on having the MBT either 100% full on the surface or 0%
> full while submerged.  What do you do for different weight pilot and
> passenger?  You either have to add or subtract ballast like I do in a bay
> near the CG of the boat or you have a VBT that can you can take on ballast
> in terms of water to get the boat near neutral after MBT are flooded.  The
> third option on variable ballast is what Alec did on Snoopy which is to add
> or remove syntactic foam externally prior teach each dive.
>
> Cliff
>
> On Thursday, January 17, 2019, 2:40:19 PM CST, David Colombo via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Cliff, I plan on doing a manifold system that groups together a couple
> of tanks for both port and starboard tanks and foward and aft tanks. I hope
> to use electric valves. The varible ballast is a worm drive 100# weight
> internal under my battery area. The external mbt will all be molded
> fiberglass shapped around the ribs between the pressure hull and
> exoskeleton, with the exoskeleton being one side of the tanks. I also plan
> on a lifting bag component at the nose area forward of the front pilot to
> be used to lift that pilot higher out of the water to increase the
> freeboard height of the ct for on station personal transfers.  Question, if
> i have a starboard and port tank, would you manifold them to a single valve
> locatation at the 12 oclock position, or use two valves to control each
> side.
>
> David
>
> On Thu, Jan 17, 2019, 11:14 AM Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Nice to see progress on your boat.  I love the pics.  On your segmented
> wrap around MBT, how are you going to vent the individual MBT segments?
> Are you going to use pneumatic actuated vent valves like Alec has on
> Shackleton or are you going to try and manifold the vent piping and have
> single MBT vent valves on the port and starboard side?
>
> Back to Hank's question, are you going to have a VBT or are you going to
> handle variable ballast like I do by adding ballast weights at the CG of
> the boat?
>
> What are you going to make the MBT segments out of, plastic like polyethylene,
> polypropylene or layup FRP?
>
> Cliff
>
>
>
> On Thursday, January 17, 2019, 8:59:28 AM CST, David Colombo via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank, we have a trim weight inside using a worm gear drive, and the
> main ballast tank is a series of wrap around tanks between the hull and
> exoskeleton.
> David
>
> On Thu, Jan 17, 2019, 5:34 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> David,
> Will you have a VBT?  Is the fibre glass shell acting as the MBT or will
> you have tanks?
> Hank
>
> On Thursday, January 17, 2019, 4:46:14 AM MST, hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> David,
> Looking sweet
> Hank
>
> On Wednesday, January 16, 2019, 8:59:28 PM MST, David Colombo via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi guys, started to build the work platform for the building of the
> SeaQuestor exoskeleton. I couldnt resist setting the stations to get a look.
> David
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