Weather: Amazing! Cool and dry, very little wind. I launched just after 6:30.
- 4 x 2500
- 5′ active rests
- rate target: 26
- pace target: 2:15
I am pretty darn happy with this workout. I would have been happier if it was faster, but I executed this workout to the best of my ability. No theatrics, no bailing out.
There was one weird thing with today’s workout. I was seeing a persistent difference in pace between the speedcoach and the GPS. Now, over a short span, I don’t expect them to read the same, but for basically the whole row downriver, I was seeing the GPS based numbers giving a pace 2 to 5 seconds faster than the impeller. Must be flow, you might be thinking. At least that was what I was thinking, but right now, there is essentially no flow. The water level is so low that basically nothing is going over the dam. And when I saw the same thing going up river, I decided that something was fishy with the speedcoach impeller. Either the cal was off, or there was something fouling the impeller.
Here is a comparison of the paces for the four pieces.
GPS — Imp –> Delta
2:12.0 — 2:14.6 –> 2.6
2:14.9 — 2:17.4 –> 2.5
2:16.1 — 2:18.7 –> 2.6
2:16.7 — 2:19.5 –> 2.8
I saw nothing on the impeller when I pulled the boat, so I will do the comparison again tomorrow and update the cal if there is still a difference.
Here’s the (slow) speedcoach data.
For comparison, here are the first 3 intervals based on TCX data from RIM. The pace data is a lot noisier, but the eyeball average is about 3 seconds faster. I had a glitch with the phone and the data for the 4th interval ended up in a different file.
Here’s the TCX data for the fourth interval.
Here are the tabulated results.
TCX Data from RIM
|00019|01203|07:11|02:59.1| 18.7 | 117 |09.0|Warming up
|01250|02496|10:59|02:12.0| 26.2 | 159 |08.7|rep #1 – downstream
|03746|00474|04:59|05:15.4| 16.1 | 125 |05.9|rest
|04269|02498|11:14|02:14.9| 26.2 | 167 |08.5|rep #2 – upstream
|06767|00424|03:53|04:34.8| 19.9 | 135 |05.5|rest
|07219|02501|11:21|02:16.1| 26.2 | 170 |08.4|Rep #3 – downstream
|00020|00280|03:22|06:00.7| 13.1 | 128 |06.4|rest
|00300|02498|11:23|02:16.7| 26.5 | 170 |08.3|rep #4 – upstream
|02798|01492|09:50|03:17.7| 19.7 | 139 |07.7|cool down
|—–|09993|44:57|02:14.9| 26.3 | 167 |08.5|Main Set
Impeller Data from Speedcoach
Tomorrow: 75′ Steady State, 20 spm, HR cap at 155.