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Brian
FYI...
Custom Divers in the UK has a design very similar to your second diagram.
The price is around UKP 90 for the backplate. The problem with it, I have
been told, is that the bolts tend to dig into your back when using it for
doubles. However, I have not tried it, just seen it and passing on some
comments from someone that has.
David Shimell
Email: shimell@se*.co* <mailto:shimell@se*.co*>
Project Manager, IBM NUMA-Q, Sequent Computer Systems Limited,
Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK
registered in England and Wales under company number: 1999363, registered
office as above
-----Original Message-----
From: Brian Greenberg [SMTP:grnbrg@cc*.UM*.CA*]
Sent: Friday, November 12, 1999 5:55 PM
To: techdiver@aquanaut.com
Subject: Backplate design mods for single tank -- comments?
A year or so ago, for a winter project, I decided to build a backplate
from scratch, based closely on the designs at Roger Lacasse's page
http://spiff.physics.mcgill.ca/scuba/gear/plate.html
However, not having the need or the cash to invest in a twin-set, I intended
to dive this primarily with single tanks, with the option to dive twins
at a later time. Because I was starting from scratch, I wondered if I could
do away with the single tank adapter. This led to the following
deviation from the design of the 'standard' backplate:
A standard plate has the following (approximate) profile:
____
/ \
/ \
___________/ \____________
The profile of the plate I built is:
/\ /\
/ \/ \
___________/ \____________
(Note that this is exaggerated -- the ridge in the center is perhaps an inch
deep, and is a 90 degree bend.) There are also two sets of slots on the
two outer ridges, centered on the bolt-holes, that will allow cam buckles to
be threaded through.
These modifications allow the plate to be connected solidly to a single tank,
as well as to a set of doubles. I have not been able to test, but a P
weight should still fit with little or no modification as well. Certainly
one that has been cast for this plate would work.
Are there any flaws with this mod that I have missed? About the only
issues I can see is that the extra work involved in manufacture would
increase the price, and the addition of the four slots would weaken the
plate, though not significantly. Comments?
In any event I thought I'd post this for anyone else who is making a
custom plate, and for comments from the rest. Who knows -- maybe the
Halcyon plates will come ready for singles in the future. :)
Brian.
--
grnbrg@cc*.um*.ca*
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