[PSUBS-MAILIST] Bike sub program

[Stephen Fordyce via Personal_Submersibles]

Hi James,
A diving mate of mine made a SCUBA-bike - it had tyres filled with lead to
help keep it down, and possibly some lead and/or foam on the frame, but no
other adaptations.  Several people tried to ride it underwater while
wearing conventional single-tank SCUBA gear with not a huge amount of
success.  I think it remains an underwater bike...

Some key lessons learned that may be useful:
- Without pedals attached to your feet, it was impossible to put enough
weight on the pedal to move the thing forward
- In even the slightest current or surge it fell over!  (almost inevitable
in shallow water in anything other than a very well sheltered place)

The second one probably won't apply so much with your ballast and
floatation tanks - but if you're trying to keep the wheels in contact with
the seabed the whole thing will tilt from side to side.

Cheers,
Steve

On Thu, Aug 20, 2015 at 8:26 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> James,
> just my kind of project:)
> What about borrowing a divers BCD & a pony bottle or small tank, if you
> only have a couple of days.
> Strap the BCD to the top tube of the frame, nearer the seat, & clamp the
> bottle to the seat post (vertical
> part of frame under seat) or wherever gives you good balance. As long as
> you add some weight down
> low & keep some air in the BCD, it should stay upright.
> Maybe ask Emile, they have lots of bikes in the canals in Amsterdam. I
> think they said one goes in every day.
> Alan
>
> ------------------------------
> *From:* James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Thursday, August 20, 2015 9:32 PM
> *Subject:* [PSUBS-MAILIST] Bike sub program
>
> Hi all,
>
> I have been asked to make a "sub" for a TV program about HMS Astute and
> subs in general.  For some reason they want to make a bike go underwater to
> demonstrate a sub diving and surfacing.
>
> Anyway, im going to have about 2 days to make this thing and get it
> working so its got to be simple.
>
> Nothing is confirmed yet, I don't even know if its going ahead, but I gave
> the a rough idea of what I thought could be done in the limited time.  This
> is my first idea.
>
> I wondered if people could have a look and see what they think?   Any
> suggestions, top tips, completely other ideas are most welcome.
>
> Many thanks
> James
>
>
> ​
>
>
>
>
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