[PSUBS-MAILIST] K-250 Angle Stiffener Web Question

[Rick Patton via Personal_Submersibles]

Hi Steve
I agree that it would be difficult to effectively calculate what
significance holes would make in the T bar stiffeners so I personally am
not doing it as those stiffeners play a big role in the integrity of the
hull especially if it is slightly out of round.
I do know that stress in steel flows along it like a wave in the ocean and
slowing down or quickly diverting it causes problems which is called a
notch effect so I am tig welding stainless nuts where needed to attach
things to.
Someone else in the group awhile ago mentioned that Home Depot sold
aluminum window stops that would clamp onto the edges of the T bar frames
with a SS set screw. I am not a structural engineer but I wouldn't think it
would be a good idea to drill holes in a structural member but someone like
Sean might know.
Rick

On Thu, Sep 7, 2017 at 6:51 AM Steve McQueen via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> All, as most probably know a K-250 has internal angle stiffeners (L).
>
> In my rebuild I have avoided drilling any holes in the web portion of
> these stiffeners (actually had some existing holes from the original build
> welded up/filled).  However, I am finding it would be nice if I could drill
> a few small (1/4") holes to help mount some interior parts. I believe I am
> looking at 1 to 3 of these holes max. in any single stiffener web.
>
> Calculating any reduction in functional strength that might result from a
> few small holes isn't straight forward.  I guess I am looking for some
> feedback from those who understand the web function of an L stiffener
> better than I.
>
> My guess is this wouldn't be a significant issue and I an being too anal.
>
> Thanks,
> Steve
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