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The front wheel hub of my bicycle is a bit lazy. The rear
one is OK, it's got a nifty epicyclic gearbox in it, which is
nice. So I want to put the front to better use, I'd say that
a
dynamo would be a good idea, but it's already been done.
So, an old style mechanical air-raid type siren is
effectively
a centrifugal fan, with slotted exits. There's often a bit
of
a horn-style motif to improve the whole direction of the
sound control thing. We could use an epicyclic gearbox in
the front hub to power such a siren. A cable operated
clutch would bring it in and out of operation, otherwise
you'd have a constitutive Sirencycle*
This machine could be used to ride around areas that
need a good siren-ing. Such as nuclear missile targets,
tornado zones or France. Alternatively it could just be
a
jolly feature to have on your bicycle to enjoy with like-
minded chums.
* which I think is near Cheltenham.
[xandram], this is as close as I can get
Cement_20Truck_20Mu...Ice_20Cream_20Maker
[normzone, Aug 21 2014]
Gears
http://sheldonbrown.com/derailer.html
I think Sheldon would have liked the HB [bs0u0155, Aug 21 2014]
[link]
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Horror of horrors! It has just occurred to me to wonder whether or not the unique sound of bagpipes might be emulated by your bicycle siren. |
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You could use it to warn OF imminent bagpipe deployment... |
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Except for lovelorn men chasing after you in the street attracted to your siren song. |
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Out of interest, which geared hub are you using, and are you using chain or belt drive? I'm considering upgrading, but I can't get anyone to recommend anything other than a rohloff (at like $2k+). |
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// A cable operated clutch // jammed in engaged position 5 km from home at sunset [+] |
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+ Can we get an alternate Ice Cream Truck song /
siren? |
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//which geared hub are you using// |
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A 1966 Sturmey Archer 3 speed, with the original
chain. Derailleur systems <link>, with all their wibbly-
wobbly compromise cogs, are for the sort of weak
minded individuals that buy a set of 107 kitchen
knives off late night cable TV. |
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In all seriousness, I hear the new Sturmey Archer
stuff is heavy but good. |
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I'm pretty sure Sturmey Archer now do a fixed-gear (i.e. no freewheel) 3-speed hub, for the hipsters. |
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Sturmey Archer is the best. I detest those derrière gear
systems. No man or woman needs any more than 3 speeds. |
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The Shimano Alfine is available in 8 and 11 speed versions. I've
not ridden one but a few people at work ride them. Not sure of
the price but definitely cheaper than a Rohloff. |
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[+] idea, [+] piluso's anno. |
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[+] make them mandatory during the French stages of the Tour De
France to ensure a bloody good siren-ing. |
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//mandatory during the French stages of the Tour De
France to ensure a bloody good siren-ing// |
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That would be fantastic, imagine the din of a
furiously sirening peloton descending an alp. |
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Well, if you are going to use this going downhill in France, the sound
of a WWII Stuka siren might be a bit much. |
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If you built it right, you could use the front forks as the siren horns.
The shape is vaguely the same. |
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// use ... in France, ... a WWII Stuka siren might be a bit much // |
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Au contraire, it will just mean the french riders increase their speed to get away ... |
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// french riders increase their speed to get away
...// |
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which increases the tone and intensity of the siren,
which increases the speed further... |
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A vicious cycle if you will. |
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