E=IR wrote:How long does it take to charge up?
How far will it go on a charge?
JCG wrote:I'm also trying to figure out a way to use my laser pointer and a level to get the slopes of the hills in the immediate area of the engineering building.
paultrafalgar wrote:What we all want to know is what it feels like: how hard were you pedalling? In a sense, you got more than 100% regen. Of course, that's because you are pedalling to add energy.
Are you left with the impression that this is either a) a practical ebike with out a battery or b) would make a worthwhile addition to an ebike with a battery? If either of these are true, what is the possibility of others building one of these ebikes - in other words, can one buy the ultracapacitor and is it prohibitively expensive compared with say LiFePO4 cells?
Can you think of experiments which take your pedalling strength and weight out of the assessment? Are you planning any test with a battery as well as ultracapacitor?
Any longer trips planned? With video (this will give an impression of your effort)? How about a test against another ebike - one circuit with you on your bike and someone else on a known bike, followed by another circuit where you swop bikes?
JCG wrote:...Can you think of experiments which take your pedalling strength and weight out of the assessment? Are you planning any test with a battery as well as ultracapacitor?
It's going to be hard to take those values out without a propulsion model. I need one of those to be refined for use in the paper I hope to get out of this, so I will see what I can do. It will probably be a data fit approach; I can add my mass to that of the bike, but quantifying pedaling power is going to take some creativity. I realized that we have one perfectly flat area nearby - there's a running track at the high school just to our west. I am going to sneak out there with some students and get some zero-grade data. I think that a battery-cap mix would be great. I'll take any suggestions of a good, long-life, light 36 V pack that someone could recommend.
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