Underwater cycling?

Bob' email hidden in said:

Anyone willing to test the seal? Gave me a chuckle.
cyclexpress.co.ukCompact Opticube 3LED Front Light 866Open ↗. asp

I believe Myra is the resident bog snorkler...

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On Tue, 16 Sep 2003 21:22:42 +0100 someone who may be Richard Bates
<[email hidden]> wrote this:-

Quoted message said:

Quoted message said:

cyclexpress.co.ukCompact Opticube 3LED Front Light 866Open ↗. asp

I believe Myra is the resident bog snorkler...

50 metres is a long way down to snorkel...

--
David Hansen, Edinburgh | PGP email preferred-key number F566DA0E I will always explain revoked
keys, unless the UK government prevents me using the RIP Act 2000.

David Hansen email hidden in said:

On Tue, 16 Sep 2003 21:22:42 +0100 someone who may be Richard Bates
<[email hidden]> wrote this:-

Quoted message said:

Quoted message said:

cyclexpress.co.ukCompact Opticube 3LED Front Light 866Open ↗. asp

I believe Myra is the resident bog snorkler...

50 metres is a long way down to snorkel...

Good point. I calculate that a 50m snorkel of 2cm diameter would require a lung capacity of at least
23 litres (and even then you'd be rebreathing a large amount of expired air), although that seems
massive. (pi*r^2*5000)/1000 ??? Has my maths gone fundamentally wrong there???

Love and hosepipe from Rich x

--
A hippy goes up to a burger bar and asks the vendor, "Make me one with everything"

Stop sleeping to email me.

Bob said:

Just noticed this on their frontpage...

Gave me a chuckle.

Anyone willing to test the seal?

Gave me a chuckle.

cyclexpress.co.ukCompact Opticube 3LED Front Light 866Open ↗.

Quoted message said:

asp

Ah 50m! Based on the definitions used for watches that means not even splashproof

Tony

--
"If you tell the truth you don't have to remember anything." Mark Twain

Richard Bates said:

Good point. I calculate that a 50m snorkel of 2cm diameter would require a lung capacity of at
least 23 litres (and even then you'd be rebreathing a large amount of expired air), although that
seems massive. (pi*r^2*5000)/1000 ??? Has my maths gone fundamentally wrong there???

Love and hosepipe from Rich x

Your maths is right, but incomplete. As depth increases so does pressure, for every 10m of water
above you 1 atmosphere (bar in SCUBA speak) is added. Hence pressure @ 50m = 50/10 + 1 = 6 bar.

Therefore you would have to use 6 times your normal effort to breath (ie pump the air up to ambient
pressure) - an impossible feat. If you could, the total volume (at the surface which you inhaled)
would be 6*23 = 138 litres. Of course to 'flush' the stale air would require shift only
138/((6-1)/2) = 55.2 litres (at the surface).

Also at that depth Nitrogen Narcosis becomes an issue.

Finally to bring this back to the OP's subjectline, it has been done:

perfectsoulutions.combeyondtheshore greet.aspOpen ↗

Regards

Alex (sometimes a scuba diver)

In article said:

perfectsoulutions.combeyondtheshore greet.aspOpen ↗

That can't be good for the mechanics! I wonder what tractions like down there, as there's a lot more
viscosity to get through.

- Richard (ex diver)

--
_/_/_/ _/_/_/ _/_/_/ Richard dot Corfield at ntlworld dot com _/ _/ _/ _/ _/_/ _/ _/ Time is a
one way street, _/ _/ _/_/ _/_/_/ Except in the Twighlight Zone.

In message <[email hidden]>, Richard Corfield
<[email hidden]> writes

Quoted message said:

Quoted message said:

perfectsoulutions.combeyondtheshore greet.aspOpen ↗

That can't be good for the mechanics! I wonder what tractions like down there, as there's a lot
more viscosity to get through.

Buoyancy is not your friend either. At Llanwrtyd Wells they fill the tyres with water and hand
weights on the bike to get any traction at all. And that's in only a couple of metres of water!
--
Sue ];(🙂

Sue said:

Buoyancy is not your friend either. At Llanwrtyd Wells they fill the tyres with water and hand
weights on the bike to get any traction at all. And that's in only a couple of metres of water!

Water depth makes no difference to the boyancy of the bike so what works for 2m will work for 30m

Tony

--
"If you tell the truth you don't have to remember anything." Mark Twain

"Tony Raven" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Sue said:

Buoyancy is not your friend either. At Llanwrtyd Wells they fill the tyres with water and hand
weights on the bike to get any traction at all. And that's in only a couple of metres of water!

Water depth makes no difference to the boyancy of the bike so what works

for

Quoted message said:

2m will work for 30m

Hmm, depends on tyre pressure a bit. At 100m, definitely less buoyant. At 30m, many MTBs would be
less buoyant.

Generally speaking the deeper you get the less buoyant it will be.

cheers, clive

Clive George said:

"Tony Raven" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Sue said:

Buoyancy is not your friend either. At Llanwrtyd Wells they fill the tyres with water and hand
weights on the bike to get any traction at all. And that's in only a couple of metres of water!

Water depth makes no difference to the boyancy of the bike so what works for 2m will work for 30m

Hmm, depends on tyre pressure a bit. At 100m, definitely less buoyant. At 30m, many MTBs would be
less buoyant.

Generally speaking the deeper you get the less buoyant it will be.

Not when the tyres are filled with water as was stated above. And for these purposes the assumptions
are either the frame tubes fill with water or are treated as incompressible to first order.

The rider on the other hand will become less bouyant and have other problems riding at 100m (hence
my choice of 30m) ;-)

Tony

"Bob" <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Just noticed this on their frontpage...

Gave me a chuckle.

Anyone willing to test the seal?

Gave me a chuckle.

cyclexpress.co.ukCompact Opticube 3LED Front Light 866Open ↗. asp

For anyone needing a rear LED light the same link has a 30% off offer on the Cateye LD600. One of
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