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I like headroom and aero is right about the ESC still seeing full load.
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I also like headroom, but will a guy using an Ice 75 really be that much more at risk than the majority using an airboss 80? I don't know enough about esc's and fet's to get into the technical details. I've just seen quite a few guys running the ice 75 with no issues so I'm curious..
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Can you expand upon this? Are you saying that no matter what the throttle is set at, the ESC sees the same load? I know you guys had been dialing back your endpoints with the 16 x 8 a while ago, I am a little confused... Can you clear me up?
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With that said, I think we can all agree that none are perfect and all have the potential to eventually do something that may not make you happy. But like I said to RCPilot1234, if I were not concerned with the price, I would take the JR's over the Hitec. I think that's fair. |
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Latest blog entry: Extreme Electric Power - The Math
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I like to explain this by using an example, like the water hose and the fan. The water shooting out of the the hose is the current (Amps) and the fan is the FETs in the ESC. When the fan is moving very slowly, more water gets through the spaces between the fan blades to the motor making the motor rotate faster. When the fan is moving faster, more of the water impacts the fan blades, which in turn, diverts the water current going to the motor. Less current means lower RPMs. The amount of water shooting at the fan is the same no matter what. The ESC actually has to work harder to keep current from the motor, so there is more heat involved in lower throttle settings than at WOT. The reality is something a bit more complex, but the rotating fan explains a lot, like the pulse width in the switching. To understand this better, try to toss a small wad of paper through a rotating ceiling fan at low speed, then at high speed. |
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Latest blog entry: Extreme Electric Power - The Math
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Thx. This helps. Some of the confusion was the assumption that you still had the 80 amp esc and you were dialing back to save the esc. Now I see.
The other question that now comes to mind is... So the esc has to be able to handle. All the amps at low speed but the amps only go up when the motor draws them and that can only happen as the throttle goes up so... How is it that at low throttle the esc is seeing ALL the amps? Am I makingany sense here? Not sure I follow myself LOL |
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Well, the misconception is that there is something regulating the flow of current between the battery and the ESC, but there isn't really. So the ESC is like the water valve and the valve feels all the water pressure (current) coming from the source (battery), then regulates the amount that goes to the motor. As soon as you plug in the battery, the circuit is complete and the ESC is hot.
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Latest blog entry: Extreme Electric Power - The Math
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If it sees all the current while at rest then the esc should burn up just sitting there on the bench table cause there will be no air to cool it down? Also, why does an ESC come down cool if the power system does not over tax it i.e. my MKII Torque on a 15x 6, but then comes down very hot if I overload the system i.e. the same system with a 16 x 10? |
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Yes, off is off. Throw the idle switch and the circuit is complete.
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Latest blog entry: Extreme Electric Power - The Math
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OK, got that part thx. did you see my edit above?
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Heat is a product of current and resistance. Just like putting smaller wires on a battery, if you restrict the current, you get more resistance, and therefore more heat. Another reason why I use about 20% headroom from the published current. The bigger the pipe, the more available water can flow without resistance.
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Latest blog entry: Extreme Electric Power - The Math
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Many thanks for the help everyone
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