I found out that they never posted official times from the last time trial because their chip system wasn't working properly - whoops!
5k time trial: Got a slow start clipping in and made a poor turnaround.
Watch time: 9:41(?)
Garmin time: 10:12(?)
Average heart rate: 170 bpm
Average bike computer speed: 18.5 mph
Maximum bike computer speed: 23.3 mph
Official 5k time: 9:41
Calculated speed: 19.26 mph
Rode another mile or two between time trials to keep the legs warm. They were 45 minutes apart.
10K time trial: Better start (clipping in) and better turnaround, but I could feel some fatigue slowing down my legs from the start.
Watch time: 19:52(?)
Garmin time: 20:27(?)
Average heart rate: 166 bpm
Average bike computer speed: 18.2 mph
Maximum bike computer speed: 21.5 mph
Official 10k time: 19:43
Calculated speed: 18.91 mph
I had hoped to go faster, but that's as fast as I could go today. That's as much "oomph" as my legs had in them. No excuses, it just shows that I have a lot of work yet to do! That gives me a benchmark for my first 5K and 10K cycling time trials and helps chart the path for improving on them the next time around.
Still, it was fun and I met some very nice local Maryland cyclists - a very congenial group of Senior Olympians!