I was very excited when I read about the pedal pressure sensor, and I’d
love to be able to quantify my pedalling technique. Surely there’s a PhD
thesis in that somewhere. However, I was riding along this afternoon
thinking about pedalling style, and was wondering how useful such a sensor
would be. Certainly when riding a bike, you’re ideally applying torque to
the cranks no matter what the crank position: with clipless pedals you can
be pushing forwards when the crank is facing up, and you can pull up when
the crank is horizontal. I tend to do a similar thing on the unicycle,
without being clipped into the pedal: when the crank is facing up, I may
actually be pushing slightly forwards, so the readings on the pressure
sensor would be weird.
Just some thoughts. I think this becomes a significant issue when
offroading and track-standing - you bend your feet to exert pressure on
the pedals in weird directions.
Now if the pressure sensors could give simultaneous monitoring of crank
angle, pedal angle, and foot force (as a vector) then I’d be REALLY
excited (in a nerdy, engineer kind of way).
On 7 Oct 2001 05:38:58 -0700, Nicholas Price
<pricen01@tartarus.uwa.edu.au> wrote:
> Now if the pressure sensors could give simultaneous monitoring of crank > angle, pedal angle, and foot force (as a vector) then I’d be REALLY > excited (in a nerdy, engineer kind of way).
Why not ‘just’ strain-gauge the crank? That’ll give you everything you
want, won’t it?
regards, Ian SMith
|\ /| Opinions expressed in this post are my own, and do
|o o| not reflect the views of Amos, my mbu puffer fish.
|/ | (His view is that snails are very tasty.) http://www.achrn.demon.co.uk/amos.html
I would have thought that as far as an axle was concerned the only
pressure that can be applied >is< down (or possibly up), that is to say
all pressure will be ultimately rotational so any >forward< pressure would
be so small as to be non-important. In my original post i mentioned the >X
project Unicycle< this has weight/pressure sensors in both pedals, the
saddle and a crank angle sensor, so i think DM has covered all relevant
options :-), he is currently thinking in terms of making the four sensor
system more mobile, but with constraints on his time this may take a
while. trev
(Disclaimer) The views expressed here are my own and not necessarily those
of DM Engineering.
----- Original Message ----- From: “Nicholas Price”
<pricen01@tartarus.uwa.edu.au> To: “unicycle news”
<unicycling@winternet.com> Sent: 07 October 2001 13:36 Subject: DM’s pedal
pressure sensor
> > I was very excited when I read about the pedal pressure sensor, and I’d > love to be able to quantify my pedalling technique. Surely there’s a PhD > thesis in that somewhere. However, I was riding along this afternoon > thinking about pedalling style, and was wondering how useful such a > sensor would be. Certainly when riding a bike, you’re ideally applying > torque to the cranks no matter what the crank position: with clipless > pedals you can be pushing forwards when the crank is facing up, and you > can pull up when the crank is horizontal. I tend to do a similar thing > on the unicycle, without being clipped into the pedal: when the crank is > facing up, I may actually be pushing slightly forwards, so the readings > on the pressure sensor would be weird. > > Just some thoughts. I think this becomes a significant issue when > offroading and track-standing - you bend your feet to exert pressure on > the pedals in weird directions. > > Now if the pressure sensors could give simultaneous monitoring of crank > angle, pedal angle, and foot force (as a vector) then I’d be REALLY > excited (in a nerdy, engineer kind of way). > > nic
That X Project Unicycle is really interesting. Adding a Bluetooth
trasmitter or some other wireless transmitter would be cool. That way you
wouldn’t have to keeep it tethered to a laptop and wouldn’t have to run
beside the unicycle carying the laptop.
john_childs
>From: “Trevor Pearce-Jones” <trevpj@globalnet.co.uk> > >nic > >I would have thought that as far as an axle was concerned the only >pressure that can be applied >is< down (or possibly up), that is to say >all pressure will be ultimately rotational so any >forward< pressure >would be so small as to be non-important. In my original post i mentioned >the >X project Unicycle< this has weight/pressure sensors in both pedals, >the saddle and a crank angle sensor, so i think DM has covered all >relevant options :-), he is currently thinking in terms of making the >four sensor system more mobile, but with constraints on his time this may >take a while. trev > >(Disclaimer) The views expressed here are my own and not necessarily >those of DM Engineering. > >Trevor Pearce-Jones > > ¸ ,o¤°´°¤o,¸¸ ,o¤°´°¤o,¸¸ ,o¤°´°¤o,¸[/i] [i]> Trevpj@globalnet.co.uk[/i] [i]> Devizes. Wiltshire. England.[/i] [i]> °¤o,¸¸ ,o¤°´°¤o,¸¸ ,o¤°´°¤o,¸¸ ,o¤°´