[PSUBS-MAILIST] SeaQuestor progress

[Cliff Redus via Personal_Submersibles]

 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 sweetHank
    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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