For today, I found a series of caches along a disused railway, and then another series on a byway. That means, no problems using the bike! No lifts, and probably a good terrain.
I nearly aborted the mission. There were serious problems on the M25, two sections were closed. I would be going on the M4, and my usual route to get to the M4, doesn't use the M25. But when the M25 is closed, you can expect a lot of traffic on all other roads.
So when I got to the Amersham end of the A355, I saw a traffic jam. There's never a traffic jam there. But the A355 is an 8 mile run to the M40, and maybe the M25 traffic had diverted that way? I nearly turned round and went home, but I didn't, and it turned out to be not nearly as bad as it looked. I was delayed by about five minutes on the A355 going to the M4, not a big deal.
I tried a couple of experiments. After I went down the disused railway, I came back along the road. I usually run the bike on 8S (29.6 volts) but for the return journey, I used 10S (37 volts), which gives it a bit more pep, nice when I'm in a lot of traffic. Then, for the afternoon run, because I'd used so much battery in the morning, I loaded up my old heavy 7S (25.9 volt) batteries, with three of them running in parallel (I can't use just one, because the battery management system cuts out when I give the bike full throttle, because the load is too great, but by running two or more in parallel, I divide the load). So I ran on three different voltages today. The usual blobmeter that e-bikes have would have been seriously useless, but I run a digital voltmeter, so I had meaningful readings of my battery condition all the time.
This was a bit unexpected.
I had a bit of a terrain problem at one point, when I mistook a gallop for a bridleway. It's an easy mistake to make; you see hoofprints on both. But a gallop is very springy, I suppose horses like that ... but bikes don't, it was hard work. And then I realised my mistake, and took the bridleway several yards away, and that was much better.
44 caches found, one DNF.
Maybe you could offer to convert the Dalek to battery power. You could even use it for caching. Unless you expect stairs en route. :)
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