I have recorded reams of data from paddling:
Everything is keyed on time, using the Time::HiRes perl module. Now I just need to test a few hypothesis:
I do not really believe that paddling is that simple, but I'm looking for some well defined problems to brush up on my skills with R
The new addition to this is the accelerometer, which adds significant resolution to the data. It supports sampling rates up to ~475Hz, but I only had it working at 25Hz (that's how fast it worked reliably with minicom).
As a first pass, I turned everything on and put it in my drybag. I wanted to get a feel for how it all worked.
After practice I loaded up all of the data into R, and set up the data as time series.
A major error source is the correlating of the starting points of the time series. The GPS, and HR monitor are fairly easy to correlate (because they have reasonably accurate clocks onboard). The raw accelerometer output I used didn't timestamp the data. As I was using minicom to capture the accelorometer output, I ended up using the ctime of the minicom capture file. Assuming a capture rate of 25Hz(which it was set to), and the number of samples, I estimated the start time.
I'll write a zaurus application that does this.
A keen observer will note that the accelerometer also isn't calibrated well.
At 25Hz, you can see the individual strokes.
This means it should be possible to systematically analyze what acceleration waveform correlates to the highest hull speed, and thus validate what stroke technique is most efficient.
That, however, is gonna take a schwack of work.
The most entertaining part of the whole evening is the party, which was in the same place as it was in 2005. I wonder if they've washed the floor since.
Tam ended up running the same leg as I did last year, and beat my time by 2 minutes. Grr.
|0400h||Idea preventing me from sleeping. How to transform a set of distances between points into vectors?|
|0445h||Leave for Vernon|
|0915h||Arrive in Vernon (at Kin Beach)|
|0945h||Welcome FCRCC Novice crew. The completed the short course for the Vernon Freshwater Challange in 2:31. Congrats!|
|1000h-1200h||Race preperation madness ensues. It turns we have 2 teams of 8, instead of 2 teams of 9. This means longer shifts. Whee!|
|1215h||Start the Vernon Freshwater Challenge Long course.|
|1630h||Finish the Vernon Freshwater Challenge Long course.|
|1700h||Load the canoes back on to the trailer.|
|1800h||Depart for Vancouver.|
|0000h||Arrive in Vancouver.|
After taking about 2 weeks off running to see if my knee would stop hurting,
I decided to take a nice easy jog around the soft trails of Burnaby Lake.
It's been about 3 months since I ran around Burnaby Lake, and the vegetation
has exploded. On my way out of the park I lost a fight with some blackberry
brambles and bled home on the skytrain.
The good news is my knee doesn't hurt in the old way anymore.
Conditions were good for the time trial. There was a bit of a breeze, and a
bit of a tide, and it was nice and sunny. There were three of us doing 2 rounds
of the False Creek 5km loop.
About a third of the way into the first loop I managed to find and keep good
upwind rhythm, and then turn at Science World and find and keep a good downwind
All told I'm pretty happy with the way it went. As Calvin put it, I should
have stopped paddling to suck back a power gel when I was already moving,
instead of when I was turning around and essentially stopped.
I haven't seen the posted results, and I didn't time myself, but the number on the time sheet was "57:11?", which would be good.
Fast forward to Sunday Morning. Around 0600h. The Half Marathon started at
0700h. It was pouring rain, and about 279K (6C) out. The race start was about 2
blocks away from our current apartment, so we avoided having to check any gear,
have to find parking, or try and figure out how to get to the start.
I've never run a half marathon before, so I wasn't sure what to expect. Tam
and I, over much discussion decided to run together at 7:30 minute miles for
the first 10km, and then settle into our own paces.
This worked out pretty well for me, as 7:30 per mile is probably slower than
I'd run if I were pace myself. I have to admin that the slower initial pace,
combined with the heavy traffic at the start probably prevented me from blowing
up half way through the race. By the second mile, the lack of any real
warm-up, and the cold, wet weather were taking their toll, I could feel my
calves begin to tighten.
By the 5th mile, I was relaxed, and feeling good. When we got to Stanley
park and the 10km mark, I convinced Tam to let me pace off of her to the top of
We made it up the hill, and then Tam and I split up and fell into our own
paces. I immediately proceeded to bomb down the other side of the Prospect
point hill. This was our home turf, so we knew what to expect.
The remainder of the race was fairly flat, with the exception of a few hills
that I'd forgotten about -- a climb to get out of Stanley park, and the climb
from Beach Avenue up to Pacific Boulevard.
All told, I finished the race strongly at 1:37:23 on my watch, which was 4
seconds slower than the official "net" time of 1:37:19 posted later during the
A few notes about the Vancouver Half Marathon:
August long weekend is a good time to be in the Okanagen. Unless you don't have a place to say. Or don't like heat.
My excuse for making the trek out to Vernon this time was the Vernon
Freshwater Challenge. The race was on a Sunday morning, so I rode my bike out
on Saturday Afternoon. Meriit when I rode past it.
There was nowhere to stay in Vernon, so I ended up staying up at Silver Star. Although more expensive than camping, it was quiet, and cool.
The Vernon Freshwater Challenge is a fun race: well organized, warm,
beautiful location, and a nifty beach start. It is also a change race. Change
races are oddly similar to relays; in a change race there are 9 paddlers and
only 6 of them are in the boat at any time. A escort boat carries the other 3,
periodically dropping a few in the water in front of the canoe. The paddlers
become swimmers, and the swimmers become paddlers. The escort boat then cycles
around and picks up the swimmers. Getting into a boat going 13kph is harder
than it sounds.
Race day started by getting up too early to cheer the women for their 0700h
start. Then followed about 4 hours of trying to organize 9 guys for a 4 hour
race: food, water, paddles, and a coach (someone to keep on top of the change
schedule). There was a brief delay of the race start when Steve, the steersman
for our top boat, cut his head open on a car door.
The race went well. We had a good start, we didn't huli, and we beat the women and all of the mixed teams.
On September 24, 2005, we wandered up to Whistler to go ziptrekking for Annie's Birthday.
We picked up Spencer at Park Royal in West Vancouver, and zipped up to
Whistler and ... waited. Apparently the 10:30 really means 11:00. I'm sure
Kai would have an appropriate rant about Canadians and punctuality.
While wandering about waiting for the others of our party to arrive, I
couldn't help but notice how busy Whistler was. Without snow. Maybe there is
something to this mountain biking. We'll have to give the Big Squishies a spin
Upon the arrival of the rest of our party (apparently everyone else know
that 10:30 really means 11:00), we got all kitted up in climbing harness and
started suspending ourselves from cables representing a large loss in
gravitation potential enegey.
A large bus took us through the construction zone for the 2010 bobsled track
into some rare old growth temperate forest. The only reason that it still
exists is that it was too difficult to log the first time the area was
Zipping a 400m line 50m over a stony stream isn't that much different than
zipping around on a playground. Except for going a lot faster, and a much
5 zips took us up and around a well designed and well maintained set of tree platforms. A good time was had by all.
Now only if I'd stayed for dinner, but instead I ran off to see Salman Rushdie..
A weblog by Jack Cummings