[PSUBS-MAILIST] buoyancy

Wed Apr 15 03:44:37 EDT 2020

I have some extra tube and I will know right away when I start so I won't
end up ruining much but hey what ever works. I'll keep ya posted.
Rick

On Wed, Apr 15, 2020 at 10:24 AM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick, my feeling is heat will make it worse.  I would try it with sand and
> no heat.
> Hank
>
> On Wednesday, April 15, 2020, 1:54:11 PM MDT, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Thanks for the offer Alec and I may just do that if the sand thing doesn't
> pan out! Heat bending aluminum tube or pipe is an art and easy to screw up
> if you haven't done much of it as there are no tell tale signs unlike
> stainless or steel on when it is ready to bend. tube being much less
> forgiving than sked 40 pipe. The reason I asked you if you used a rose bud
> is because it is much more efficient in heating a larger area than a
> regular burning tip. I'll try and document this if it turns out and share
> it with you guys.
> Rick
>
> On Wed, Apr 15, 2020 at 8:44 AM Douglas Suhr via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Quite a few years ago (when I was still a kid) I remember endeavoring to
> bend a curve into a piece of aluminum tubing. Dad had mentioned to me the
> idea of filling the tube with sand (something he had heard from someone
> down the line) and so I did just that: loaded the tube with as much sand as
> I could ram in there, capped it off and then heated the aluminum up with a
> torch. I had bolted a solid rubber cart wheel horizontally onto the
> workbench as a jig. The sand didn't help at all and this experiment failed
> miserably! As Alec suggests, there must be something more to this sand
> business. I finally resorted to investing in a conduit bender with the
> radius I was looking for and that did alright (but of course this was just
> thin-walled aluminum).
>
> Last year Alec made me a couple of (very strong) stainless steel bumper
> bars for Snoopy's bow (think: SportSub) and he curved those things
> beautifully! ~ Doug
>
> On Wed, Apr 15, 2020 at 2:27 PM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Same as you, around the CT. If you need me to bend you a piece, just let
> me know. It’s much cheaper to ship a bit of bent tube than a bending
> machine!
>
> Sent from my iPhone
>
> On Apr 15, 2020, at 2:09 PM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 
> Good to know as a plan B. What radius were you bending to?
>
> On Wed, Apr 15, 2020 at 7:57 AM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Ah, I did the same at one time on Shackleton - 1” SS tubing with Swagelok
> fittings. The bending machine did it fine and I used the standard rollers.
>
> Sent from my iPhone
>
> On Apr 15, 2020, at 1:48 PM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 
> I up sized the MBT vent tubing on my 350 to 1" and so I need to have it
> wrap around the con until it gets below the external exhaust valve and the
> con is 24" dia. I have the sand and the tubing already so I'll let everyone
> know how it comes out.
> Those tube rollers are nice but you need a dye for ever size tube you want
> to roll which can get expensive unless you only roll one size all the time.
> Rick
>
> On Wed, Apr 15, 2020 at 1:47 AM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Ouch, I forgot you were in Hawaii. I actually can't recall what sort of
> jig I used because that little experiment was quite a few years ago. What
> I've been using in recent times is this:
>
>
> https://www.harborfreight.com/automotive/auto-body-trim/metalwork-tools/tubing-roller-99736.html
>
>
> I've been very happy with it, but it's not for small diameter work. What
> is it you're trying to make?
>
> On Wed, Apr 15, 2020 at 1:49 AM Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Did you use a rose bud and was your jig something welded to the table like
> flat bar or steel tabs tacked to the table close together? that was what i
> was thinking of doing. I hate to send it to the East coast from Hawaii if I
> don't have to.
>
> On Tue, Apr 14, 2020 at 5:49 PM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> It dimpled just like it had without sand. Its a well known technique, but
> there must be something more to it beyond than filling the pipe with sand
> and blocking the ends.
>
> :)
>
> On Tue, Apr 14, 2020 at 11:28 PM Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Thanks Alec,
> What happened when you tried it and did you have a good jig to bend it
> around?
>
> Rick
>
> On Tue, Apr 14, 2020 at 5:13 PM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Rick,
>
> I've attempted the sand technique with no luck. I do have a couple of
> simple bending machines, but if its something difficult there's an outfit
> in Maryland that does nothing but bending. I've used their services many
> times, and can't recommend them more highly.
>
> https://www.josephkavanaghco.com/
>
>
> Best,
> Alec
>
> On Tue, Apr 14, 2020 at 10:52 PM Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> A reach out to the K-350 gang. Do any of you happen to know the total
> payload weight (two people)  the boat is designed for with the MBT's and
> VBT flooded?
> Also, has anyone hot bent SS tubing with sand im it in a tight radius
> before with good results?
> I am going for a 25"/26" diameter.
> Thanks
> Hope all are doing OK with this friggin virus going around.
> Rick
>
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