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Hi Alan, The T/Di ratio is 27 / 540
= 0,05 Page 486 of the handbook
acrylics says that the short time failure depth is 20 MPa = For designing I used a
table of the GL which gives a operational depth of I am currently building a
new sub. (type) Name will be “NordicSub” as the owner of the
Eurosub wants to keep that name . ( I am okay with that as the word Euro sounds
not so positive here and now…) This project used the
last domes so for more I have to do a new production run. I am now busy with
moving to The turbine bike is a project
from already 15 years ago. Great that they still write about it at the other
side of the world!! Emile www.nordicsub.nl Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens Alan James Thanks Emile, what sort of
crush depth do you think you would have with the 27mm apex? I noticed you
weren't selling domes on your site. What are you doing with all the
domes you have been pressing? I see you've
been gaining the attention of the media with your turbine powered motorbike. Regards Alan From: Emile
<emile@airesearch.nl> Alan The
recess was needed to fit the dome in the ring. Is not exactly round after thermoforming
so machining is needed anyway. The
bigger the base the better but the thickness on the apex is only I
also used a radius mill to reduce stress. Emile Hi
Emile, It looks like
you have a 28mm base to the dome & have eliminated 8mm with the 4mm angled
cut away for the O
ring & the additional recess for the retaining ring around the
perimeter. I thought the
base contained most of the stress & you would want to retain as much of it
as possible? Are you still
pressing domes? Regards Alan From: Emile
<emile@airesearch.nl> Not bad. But it is also
not done to machine a o-ring groove in the dome. Nemo’s first dome
cracked when the water o-ring froze! Attached my
solution. Green is o-ring Emile Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens André Eriksen From what you
said I made this sketch (attached). Is this a good way to fasten the dome? -Andrè 2012/6/15
Emile <emile@airesearch.nl> Hi Andre, It is not done
to drill / tap any holes in a acrylic dome. Stressraiser! For shallow
divers you can glue . Under high
pressures the dome contracts more than the ring I use a o-ring
on the edge and stainless steel bands hold down the dome. Flange also
possible for shallow divers. In the handbook of acrylics are some examples. Emile Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]
Namens André Eriksen Hi, I`m new to
this forum, and are planning to build a 3 person sub. I can`t seem
to find any plans or pictures on how to fit the acrylic dome for the
hatch. Is it screwed down on flanges with an o-ring underneath, or liquid
gasket/glue? I`ve seen some domes without flanges, how do they attach them? thank you. -Andrè
Eriksen, Norway |