Hi Jim,

Use of a rubber ballon certainly would be a way to do forming of a
concrete submarine hull. This has been done for concrete domes on
construction sites.

Anyhow i used a forming method with a so called "moving form" similar
to that used in construction of toronto TV tower. The form makes ring
after ring in a continous process...

Kindest Regards,
Wilfried Ellmer

www tolimared.com/submarine

On 25 ene, 11:03, "jim.isbell" wrote:
I would think that using a large rubber balloon for the form would be
the way to do it so it was a seamless hull.....

On Jan 24, 6:00 pm, "wellmer" wrote:

Hi, Jim,

Aeem....i have moreconcretesubmarineyacht pictures ... the reason
why i did not show pictures from construction is that forming process
is the tricky part of aconcretehull and i do not wish to give all my
secrets away upfront...

Kindest Regards,
Wilfried Ellmerwww.tolimared.com/submarine

On 18 ene, 10:50, "jim.isbell" wrote:

Those are interesting pictures, but I dont know that I believe them.
Why are there no pictures of the construction phase?

Pictures are so easy to fake these days that it makes it hard to
believe this.

wellmer wrote:
I built a nice 20 tonsubmarine yachtand had a lot of fun diving in
it. Be asured it works. Many of your questions will be answered if you
have a look at mysubmarineat website:
[www.tolimared.com/submarine]
I would be glad to discuss such a proyect with anyone interested in
submarines, personal submarines,submarineyachting, c-subs, and
similar.