[PSUBS-MAILIST] DSV Aquatic update

[Douglas Suhr via Personal_Submersibles]

Nice going Jon! Thanks for the video links...

I built a similar gantry arrangement for lifting Snoopy, though I only
have one lift beam (steel) on two 6X6 stanchions and a chain hoist. It
does the job, though I dream of a true gantry in the shop one day.

The new trailer looks like a beaut... I know you've put a lot of
effort into the trailer project, but the results look great to me. ~
Doug

On 5/29/18, Jon Wallace via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> Moved the submarine yesterday (Monday 5/28) from the original 1979 steel
> trailer to the new aluminum trailer.  Working alone, it took me 8 hours to
> build the gantry, lift the sub, and swap out the trailers.  No issues
> however and it all went pretty smoothly.  I have to admit I was a bit
> nervous about lifting the sub on wood beams, but I had used an online
> calculator
> (http://forestryforum.com/members/donp/beamclc_ctrpointload.htm) to
> determine timber sizes and it turned out to be accurate.  If there was any
> deflection in the beams it certainly was not noticeable to the naked eye.
> The submarine is completely stripped and is as light as it is ever going to
> get.  I have no idea what the actual weight is but I calculated
> approximately 2500 pounds based upon the amount of steel in the various
> parts (main cylinder, heads, conning tower, battery pods, etc).  I decided
> to split that weight between two beams rather than just one so I could use
> lighter material.  Each beam was created from laminating two 2x10x10 full
> dimensional planks purchased from a local saw mill which provided a full
> 4x10x10 beam.  Posts were created by laminating two 2x6x10 planks together
> to provide full 4x6x10 material.  Lots of bracing here, there, and
> everywhere.  Looks ugly, but is very solid.
> I used two 2-ton "come along" manual winches attached to the fore and aft
> lifting rings then lifted/lowered equally between the two winches.  Once
> free hanging, the sub did sway a bit since I had to lean on it to get to the
> winches.  This also made me nervous since too much swaying could bring the
> gantry down but I was easily able to counter and damper the small sway.  I
> probably would not have done this on a windy day.
> The old and new trailers are the same height so I only needed to lift the
> sub about four inches so that it was free of the c-channel that it rests
> inside.  Then it was simply a matter of pulling the old trailer out from
> underneath, backing the new trailer underneath with proper placement, then
> lowering the sub back down.  Happy to have the sub on a road worthy trailer
> now.
> Videos uploaded for your viewing pleasure
> Episode 3 - Trailer Swap - https://www.youtube.com/watch?v=FLbbFUlKHkU
> Episode 2 - More Trailer Mods - https://www.youtube.com/watch?v=e4d0nzWIgYo
> Episode 1 - Fender Repair - https://www.youtube.com/watch?v=zh3d5BI1vig
>
>