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Model Forum / Radio Controlled / Air Models / October 2003Motor setup on Twinstar
Is there anybody out there managed to connect the 2 motors of Multiplex Twinstar in series instead parallel? I believe this set-up will increase the duration of the flight but I am not sure if the voltage drop across the motors will cause the model to be a lot slower as the revs of the motors will be lower. Both the motors I use are identical. Any ideas anyone? Thanks Michael It will not fly with standard prop's. Prop's would have to be so big they would hit the fuzz and the number of cells!!! well I can't afford it. John. > Is there anybody out there managed to connect the 2 motors of Multiplex > Twinstar in series instead parallel? I believe this set-up will increase the [quoted text clipped - 7 lines] > > Michael Why do you think it will make the flight durations longer? For the props fitted, the motors will consume a given power, which won't change regardless of how they are wired or fed (Series or Parallel). I also doubt that cable and controller losses are that great that you'd notice. David > Is there anybody out there managed to connect the 2 motors of Multiplex > Twinstar in series instead parallel? I believe this set-up will increase the [quoted text clipped - 7 lines] > > Michael David is wrong it will make a difference to the current, the voltage across the motors is equal to the battery voltage when wired in parallel but only 1/2 the battery voltage when wired in series (assuming both motors are running)therefore 1/2 the voltage = 1/2 the current (in simplistic terms as I don't think the current drawn by a motor at various voltages is a linear graph) but the downside is they will be only 1/2 as powerful at full throttle it will increase the duration if the plane will fly(which I doubt) I would have thought the easy way is to throttle back to half power and you get the same effect? Kevin > Why do you think it will make the flight durations longer? > For the props fitted, the motors will consume a given power, which won't [quoted text clipped - 13 lines] > > > > Michael > David is wrong it will make a difference to the current, the voltage across > the motors is equal to the battery voltage when wired in parallel but only [quoted text clipped - 3 lines] > graph) but the downside is they will be only 1/2 as powerful at full > throttle 1/4 as powerful actually. The amps will come down as well as teh volts. It simply won't fly at all. > > David is wrong it will make a difference to the current, the voltage across > > the motors is equal to the battery voltage when wired in parallel but only [quoted text clipped - 6 lines] > 1/4 as powerful actually. > The amps will come down as well as teh volts. Not to be picky but the overall volts will stay constant as its fixed by the battery, the volts accross the motors will 1/2 as above Kevin > It simply won't fly at all. > Why do you think it will make the flight durations longer? > For the props fitted, the motors will consume a given power, which won't [quoted text clipped - 13 lines] > > > > Michael Hi, For instance, you have a battery of 8 cells, wich delivers roughly 8 V and a current of 10 A. Each motor, in parallel, receives 8V and consumes 5 A. If the motors are in series, each one receives 4V and runs roughly 50% less RPM than in paralel. You MAY replace the propeller with twice the pitch.This is like the gear of your car. You MAY run the motor in series with 16 cells at 50% capacity. Do it in a simple way: try motocalc and do some virtual experiments with it (www.motocalc.com...gratis during 30 days). I can not miss it. I tried several combinations and ordered a better motor for my own Twinstar. The original motor is fine, but I want more power. Robert > Is there anybody out there managed to connect the 2 motors of Multiplex > Twinstar in series instead parallel? I believe this set-up will increase the > duration of the flight but I am not sure if the voltage drop across the > motors will cause the model to be a lot slower as the revs of the motors > will be lower. Both the motors I use are identical. You can do it, but you will need 14-16 cell pack and controller to suit. Your twinstar will not fly with half voltage across the motors. Also, any frictional imbalance between the motors will result in one revving far faster than the other - instead of tending towards equal RPM, they will tend towards equal torque. NOT what you want. > Any ideas anyone? > > Thanks > > Michael |
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