[PSUBS-MAILIST] esmarelda launch

[Alan James via Personal_Submersibles]

Hi Brian,congratulations on getting her in the water.There are certain situations when filling the ballast tanks that the center of gravitycan move above the center of buoyancy & then drop below it again. Maybe once theconcrete ballast tanks submerge fully it will become more stable, as they will become lighter in the water. You wouldn't want to tip upside down with open vents in thebottom of your ballast tank though. You mightn't be able to get upright again or out.Cheers Alan


      From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
 To: PSubs <personal_submersibles at psubs.org> 
 Sent: Tuesday, April 5, 2016 9:13 AM
 Subject: [PSUBS-MAILIST] esmarelda launch
   
Hi All,               Just got back from my initial launch/test at the harbor.  Kind of a mixed bag of good and bad.  When we dropped it in the water it floated just where I had hoped it would. and was quite stable.  I have some problems with the concrete hull in that I have a bunch of small leaks around the edges where I have bolt penetrations , those leaks make it so the ballast starts taking on water , I thought I had addressed those leaks earlier but no.   So then we decided that I might as well see where I'm at with the ballast totally flooded,  started flooding the ballast and it soon became apparent that the side to side stability could be a problem.  I was on the conning tower trying to make the thing tip over and I'm pretty sure if I kept at is I could have done so.  So I need to address that .   I came in at around 7 tones .  Once I process the video I'll post a link.   But with all things considered I'm happy to know where I'm at least.  Getting in down to the harbor and back on the trailer was an accomplishment in it self ! Brian
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