[PSUBS-MAILIST] Bike sub program

[James Frankland via Personal_Submersibles]

Hi Steve,

Thanks for that.  Ive had similar experience trying to ride a bmx
underwater once.  However, in this case I think they just want to simulate
a sub going up and down.  Im not sure what the point of the bike is.  Its
not intended to move I don't think.

The thing im thinking is that I could do away with the bike and maybe put a
seat with a bubble up top and make it a bit more of an ambient, rather than
a wet sub.

Regards
James

On 20 August 2015 at 12:06, Stephen Fordyce via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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>
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