[PSUBS-MAILIST] buoyancy

Wed Apr 15 14:44:03 EDT 2020

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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