RC-Monster Forums - View Single Post - Power Question for BrianG, or other who may know

BrianG · 04.30.2008, 11:45 AM

It's true that the majority of the power needed will be during take-off and heavy acceleration. But, as the drag increases at the higher speeds, current will go up again. 100A is a pretty decent figure. I would think something as heavy as an emaxx geared tall enough to get to 70mph without two speeds could draw well over 200A to initially start, go down to around 50-60A during the "middle acceleration", and then go back up to around 100A towards the end where drag is higher.

Also, since you are looking for sustained speeds of 70mph, radio range quickly becomes an issue so you are going to want to get to that speed really quickly to have enough radio range to sustain it, and that kind of heavy acceleration will draw some serious power.

The current will also depend on the voltage used. It's true that higher voltage setups will pull less current than lower voltage ones, but the power levels needed to do what you want are going to take a combination of both high V and high A.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	04.30.2008, 11:45 AM It's true that the majority of the power needed will be during take-off and heavy acceleration. But, as the drag increases at the higher speeds, current will go up again. 100A is a pretty decent figure. I would think something as heavy as an emaxx geared tall enough to get to 70mph without two speeds could draw well over 200A to initially start, go down to around 50-60A during the "middle acceleration", and then go back up to around 100A towards the end where drag is higher. Also, since you are looking for sustained speeds of 70mph, radio range quickly becomes an issue so you are going to want to get to that speed really quickly to have enough radio range to sustain it, and that kind of heavy acceleration will draw some serious power. The current will also depend on the voltage used. It's true that higher voltage setups will pull less current than lower voltage ones, but the power levels needed to do what you want are going to take a combination of both high V and high A.