Re: [PSUBS-MAILIST] Penetrators

[John Farrington <jrf@prismnet.com>]

Dan & Vance,

Here are some thoughts on what I think we're going to do with our battery
cables.

There are 2 battery vents from each pod going into the sub, as you know.

We're going to add a third one, and use it for our electrical thru-hull
for the pods.

This third pipe is going to be built similar to an electrical thru-hull
design that Phil talked about.

You basically take a pipe, put grooves on the inside of it, then put a couple
of appropriately sized threaded rods going through it, spaced out evenly.
You then fill then entire pipe with epoxy and let it harden.  Next, you
bolt your battery cables to the threaded rods inside the pod, and also on
the other end of the threaded rod inside the sub.  (The threaded rods serve
as your electrical conduit.

We are building our battery thru-hulls as a rigid pipe welded to both the
battery pod and the sub, built strong enough to withstand the external
water pressure assuming that we have a horrible water leak into a battery
pod.


Our thinking is that we treat it as a pressure boundary even though 99.9%
of the time the will be no pressure differential on it.

We are probably going to put the electrical thru-hulls in place of the
rear battery pod vents, and move the rear pod vents forward in front of the
next rib.  Just about 10 inches forward or so, still keeping a fair
distance between the pod vents.

We still have some small details to work out but please don't hesitate to
offer any criticisms on this, as we're getting close to cutting the holes!

-John and Monica