Repeating what I had said earlier in another post, I find taht alot of the times I witness ppl using the ev calculators but not "see"ing the math and how it interrelates. So I have been working on a couple of graphs trying to illustrate the max performance ranges or limits for the newbies. I wanted to keep it simple enough by FOCUSING on single gear performance range at a set voltage (and not delve into battery/voltage switching and/or transmissions, yet). As the following graph is intended to show, the max amperage of the circuit will determine the max Torque at the wheel at a set gear ratio. Also, the max voltage of the circuit is the max RPM at the wheel at the set gear ratio. Then the cycle's and rider's weight and all the other aspects are plotted for amps/torque/force needed to MAINTAINING each given speed. (Acceleration is intended to be a different discussion and graph with times squared. not shown nor ready for discussion at this time) http://electricmotorcycles.net/uploads/wordpress/2007/09/4-to-1-gear-ratio-to-torque-to-mph.JPG
So after Mike's post, I though it would be interesting to throw in the ETEK heat performance as a sort of graduated color scale on top of the graph with my best "guess"-timation for the ETEK. Which I say is the green zone from the continuous HP @ 93 amps to stall and anything above that is a yellow and red zones. The yels and reds are gonna have to be found out how long we can stay in each zone. I basically took the guess taht 180 is the red zone. http://electricmotorcycles.net/uploads/wordpress/2007/09/mikes-amp-torq-gear-to-mph-graph.JPG Unfortunately, when I tried calculating Mike's max speed range for the circumference, I came up with a max speed of 132mph. But I am willing to bet that the plotted/actual force to maintain speed is gonna be greater than the etek can sustain at Mike's given weight and gearing. (Or I messed up his circumference) I would like the rest of the EM list to check my math to see where I messed up (if I did) and if possible the pro and cons of theses illustrations to be used for the site. Thanks in advance. I am pretty sure the fur is gonna fly, but I am willing to stand with my illustrations unless of course I see a suitable counter argument to refine a point or two. Lyle --- lyle sloan wrote: > Man, this parallels what I was thinking. Except I > wanted to show it in a graph. I will post as soon > as > I get mike's info > > ----Andrew Wowk wrote: > > Say you are pulling 200 amps with one etek running > > at any voltage: > > > > 200 * .033 ohms (terminal resistance) = 6.6v * 200 > = > > 1320 watts in heat that > > one etek must dissipate without frying. > > > > > > > ____________________________________________________________________________________ > Luggage? GPS? Comic books? > Check out fitting gifts for grads at Yahoo! Search > http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz > > ____________________________________________________________________________________ Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase. http://farechase.yahoo.com/
