[PSUBS-MAILIST] SeaQuestor progress

Sat Jan 19 12:58:42 EST 2019

Hi Alan, my comment on the trim weight, is that i might use the rail as an
an addition  locatation for additional weight to be added, not using the
weight as ballast. I should check my response before hitting send.
David

On Sat, Jan 19, 2019, 9:40 AM David Colombo <seaquestor at gmail.com> wrote:

> Hi Alan, I have 3 locations where weight can be added. Under the seat of
> the forward pilot 100#, and fifty in each wing adjacent to that pilot. I
> would remove as necessary, when i have a passenger. I was thinking i might
> be able to use  the trim weight as well, by having its travel lenght be
> able to go forward further.
> David
>
> On Jan 18, 2019 11:01 PM, "Alan via Personal_Submersibles" <
> personal_submersibles at psubs.org> wrote:
>
> Hi David,
> how are you ballasting when you are diving without a passenger?
> Alan
>
> On 19/01/2019, at 5:19 PM, David Colombo via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Cliff, the vbt i was speaking of is actually the lower section of one
> of the mbt sections which would still be in use. The way my wings taper off
> there is an area that will work for a weight insert area that i think will
> work well.
> David
>
> On Fri, Jan 18, 2019, 11:46 AM Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> OK I understand.  The only problem about using a MBT near the CG as a VBT
>> is that it is soft with an open flood port.  As such, it would be like a
>> scuba divers BCD and require tweaking as you change depth.  I think better
>> to used your added dumbbell weights at CG as your primary variable ballast
>> and keep all the MBT flooded when diving then you don't have to correct for
>> decreasing buoyancy with depth.
>>
>> Have you calculated your Reserve of Buoyancy (ROB) for the boat assuming
>> you use all the MBT for freeboard?  Should be pretty good.
>>
>> Cliff
>>
>>
>>
>> On Friday, January 18, 2019, 11:44:02 AM CST, David Colombo via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> 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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