RC-Monster Forums - View Single Post - MGM controller do I go for amperage or cell count??

BrianG · 09.12.2007, 03:04 PM

I'm thinking he means 14 cells is the limit because the battery pack starts becoming quite heavy.

Higher voltage creates higher current on a given motor. The idea is to select a motor with a higher wind (therefore higher resistance) making for less current. As you can see though, higher voltage means heavier packs even though they may be just 1p. When you start getting really high voltage (over 6s) regular lipos start becoming more and more appealing because of their reduced weight. I was hesitant to get lipos at first (opted for emolis at the time), but now I have them, I certainly wouldn't go back to NiMH. Safety isn't the forefront of my thoughts as long as they are charged/discharged correctly, and reasonable attempts at protecting/securing them are implemented (no tape or zip-ties for me!).

No, BL isn't really complicated, but the initial cash outlay can be steep. That is why we are all here; to help people make the best decision based on their budget and their needs/desires.

Maxx tires are closer to 5.6", which can make a HUGE impact on overall speed. And don't forget to account for ballooning! That too can make a substantial difference. Using 5.65" for the tires, I get 25.34mph in 1st, 31.74mph in 2nd, and 39.12mph in 3rd. And since you are using the 3 speed tranny, you can gear the spur/pinion more aggressively since first gear is so low. I don't know what spur/pinion options are available for the savage, but I would gear up a bit. You should easily be able to attain 45-50mph with that Neu motor.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	09.12.2007, 03:04 PM I'm thinking he means 14 cells is the limit because the battery pack starts becoming quite heavy. Higher voltage creates higher current on a given motor. The idea is to select a motor with a higher wind (therefore higher resistance) making for less current. As you can see though, higher voltage means heavier packs even though they may be just 1p. When you start getting really high voltage (over 6s) regular lipos start becoming more and more appealing because of their reduced weight. I was hesitant to get lipos at first (opted for emolis at the time), but now I have them, I certainly wouldn't go back to NiMH. Safety isn't the forefront of my thoughts as long as they are charged/discharged correctly, and reasonable attempts at protecting/securing them are implemented (no tape or zip-ties for me!). No, BL isn't really complicated, but the initial cash outlay can be steep. That is why we are all here; to help people make the best decision based on their budget and their needs/desires. Maxx tires are closer to 5.6", which can make a HUGE impact on overall speed. And don't forget to account for ballooning! That too can make a substantial difference. Using 5.65" for the tires, I get 25.34mph in 1st, 31.74mph in 2nd, and 39.12mph in 3rd. And since you are using the 3 speed tranny, you can gear the spur/pinion more aggressively since first gear is so low. I don't know what spur/pinion options are available for the savage, but I would gear up a bit. You should easily be able to attain 45-50mph with that Neu motor.