Quote:
Originally Posted by SpEEdyBL
To answer your questions:
1. From those specs it looks like the the 1.5y isn't ideally 1.5 turns in comparison to the 1y. An ideal 1.5 turn would have wire that is 1.5 times the length has a 1 turn and 2/3 the cross sectional area (to fit in the same space), making it have 1.5 x 1.5 = 2.25 times the resistance and 2/3 the kv. That said, the motors cannot be considered "equivalent" with the 1y on 4s and the 1.5y on 6s.
2. http://www.enerland.com/product/p1.php?num1=1&num2=4 These are considered to be some of the best cells in the industry. It's quite obvious that bigger cells hold their voltage better under a load than smaller cells when you look at the discharge curves. True that there seem to be no 6000 cells available, but that has nothing to do with my point. I was comparing 4000 mah cells to 6000 mah cells for the sake of simplicity.
3. I never said that lower voltage was more efficient than high voltage. In fact i never even said they were equal in reality. I said that a neu 1y on 4s is efficient enough for it not be necessary to use a slower motor on 6s. So how can a 4s setup that a.) that still runs cool and b.) has all the power you need, be inadaquate? |
1. I don't have an opinion on the motor choice as I certainly won't be buying a 1515 2200kv motor.
2. I'm not sure which discharge curves you're looking at but if you take a look at the charts for a 2S 4500mAh and compare to a 4S 2000mAh you'll see that the 4S pack holds its voltage just as well or better than the 2S pack. With this kind of performance you'll get more efficiency from the higher voltage system.
3. This question is relative to the end user. Cool to you may be hot for me. My ESC's typically don't run much over 100F. I equate efficiency just as high as power. In other words, just because a system can put out 4hp doesn't justify its usage especially when there is a more efficient system available that can produce the same power using less resources.