August 15, 2008
What is a formula to find horsepower on a rc airplane?
A lot of rc airplane gives me, Kv (RPM/V), weight, Resistance (Ri), Idle Current (Io) and some gives me the prop range
Voltage is a unit of electromotive force. Resistance is what controls the current at a given voltage. The problem you have in making such a conversion is that you do not have enough data. Horsepower is a unit of work. You would need to assign a value to the RPM question.
Calculate by using Ohm's law. current = voltage/resistance. Your voltage is a function of RPM speed and you said you have the value for resistance. Next, you need to convert this to a unit of work, in this case Watts. Again using Ohm's law calculate watts = current X voltage.
You need to know that 746 watts = 1 hp. Watts/746=hp
Not all that difficult, just takes 3 steps to solve. Good luck.
Filed under RC by Ray
Comments on What is a formula to find horsepower on a rc airplane? »
Voltage is a unit of electromotive force. Resistance is what controls the current at a given voltage. The problem you have in making such a conversion is that you do not have enough data. Horsepower is a unit of work. You would need to assign a value to the RPM question.
Calculate by using Ohm's law. current = voltage/resistance. Your voltage is a function of RPM speed and you said you have the value for resistance. Next, you need to convert this to a unit of work, in this case Watts. Again using Ohm's law calculate watts = current X voltage.
You need to know that 746 watts = 1 hp. Watts/746=hp
Not all that difficult, just takes 3 steps to solve. Good luck.
References :
One HORSEPOWER in electrical terms is 780 WATTS… do your own math to figure out what percentage of 780 watts your R/C plane develops
References :
http://joshmadison.com/software/convert/
References :