John in CR
100 TW
Update. I took another spin without my backpack, which has a rigid bottom so is about 1sqft of suction at the back in a tuck. At a lower status of charge I hit 65.4mph as a top speed. The reason I tried again was to bring my GPS along this time. It was getting turned off and on in my pocket, and didn't capture much of the ride, but a nice clean uninterrupted stretch it showed 108kph just as I was about to slow down for an off ramp, so unless you average over a significant distance a GPS simply doesn't have the accuracy to measure speed accurately over just a single segment. The only way that's correct is if my rear tire expanded significantly at those rpms. ie If someone says "GPS certified" about a top speed, simply ignore it.
I'll take the word of my CA instead. I measured the circumference of my wheel with me aboard and measured the distance from valve stem at 6:00 to 6:00 1 rotation and entered that in my CA, so I know it's accurate and slightly conservative compared to at speed. It's not conservative enough for thst 108kph to be correct when I know for a fact I was slowing down.
Thanks for the support and concern. This was out on the dead smooth highway cleaned by yesterday's rain, and very little traffic. The bike was tracking like on rails, so I was as safe as walking out to the mailbox to check the mail while wearing a hardhat at safety glasses. Really though, I've never had a bike feel so good at speed. The perfectly round tire and balancing it to no vibration at all spun up to 1300rpm, was such a pleasure to ride that I think I'll up the voltage and post the number the other high power hubbie users have been dreaming about.
When I do, I'll make it a task impossible for lesser hubbies, and after miles of WOT running I'll go straight into an 8% grade climb followed by a several miles of shallow up hill grade. Sure they might be able to put a flyweight cyclist type on a bike and reach the same or better speed with extreme voltage over a short sprint, but no way they have the efficiency to run at high speed for long, a simple fact of life when using inferior iron.
BTW, I did today's run with less than $200 in controllers, so it's not a spend the big bucks achievement. Anyone can do it.
John
I'll take the word of my CA instead. I measured the circumference of my wheel with me aboard and measured the distance from valve stem at 6:00 to 6:00 1 rotation and entered that in my CA, so I know it's accurate and slightly conservative compared to at speed. It's not conservative enough for thst 108kph to be correct when I know for a fact I was slowing down.
john7700 said:WOW
Thanks for posting and be safe.
J
Thanks for the support and concern. This was out on the dead smooth highway cleaned by yesterday's rain, and very little traffic. The bike was tracking like on rails, so I was as safe as walking out to the mailbox to check the mail while wearing a hardhat at safety glasses. Really though, I've never had a bike feel so good at speed. The perfectly round tire and balancing it to no vibration at all spun up to 1300rpm, was such a pleasure to ride that I think I'll up the voltage and post the number the other high power hubbie users have been dreaming about.
When I do, I'll make it a task impossible for lesser hubbies, and after miles of WOT running I'll go straight into an 8% grade climb followed by a several miles of shallow up hill grade. Sure they might be able to put a flyweight cyclist type on a bike and reach the same or better speed with extreme voltage over a short sprint, but no way they have the efficiency to run at high speed for long, a simple fact of life when using inferior iron.
BTW, I did today's run with less than $200 in controllers, so it's not a spend the big bucks achievement. Anyone can do it.
John