My Operarc lipo battery
Friday, March 30, 2012 9:18:55 AM
These motors would not be a fantastic alternative for our pylon racer. For instance, Axi could have had motors with Kv values from 860 to 1500, and then a motor with a Kv of 3000. The 3000 motor would have been for ducted fans.
Battery
My power technique rule states to make the battery about fifteen% of the complete airplane bodyweight. My electric power rule assumes a 6 moment target flight time, which is how prolonged most of us fly. But because of the reduced energy wants in our Piper Cub, 15% presents us sufficient electricity for a nine minute flight. That's fine.
fifteen% of the flying pounds happens out to about eleven.five ounces (330 g). A battery pack with 3 cells in collection is common in this airplane size assortment, so we will go with that. A rapid research on the net demonstrates that a 3S LiPo battery pack with 4000 mAh cells meets our focus on excess weight.
Electrical power
Let's do a quick calculation to see how considerably electricity our model demands to fly. My electricity rule assumes that a sport design needs about 75 watts of power for every pound of flying excess weight. We minimize that again to 50 watts for every pound for our Piper Cub. That indicates we will need 240 watts (4.eight*50). With a three cell battery pack, the output voltage is about eleven.1, which suggests that we require about 22 amps of recent (240/eleven.one).
As a protection check, let's seem at the highest electricity that our motor can produce. Outrunner motors can produce about seventy five watts for every ounce. That is a optimum that commonly we do not want to exceed and ideally, even approach. Our Axi is thus excellent for up to four hundred watts (five.five*seventy five). With our battery pack, that works out to a optimum of 36 amps (400/11.1).
Battery C Rating
Let's make confident our battery can take care of the highest current that we may demand from it. The C ranking of a battery is just the several of its ability that it can tackle in existing stream. If our battery pack ended up to have a C ranking of 10 (which would be quite reduced), then it could be discharged at a 4*ten=forty amp rate. Considering that the maximum recent that our motor can handle is 36 amps, any battery with a affordable C ranking will meet up with our demands.
Digital Velocity Management (ESC)
Picking a very good ESC for our electric power system is uncomplicated. The principal problem is knowing what's the optimum present that we will want. We already know that: 36 amps. Thus a 40 amp pace control will function.
Propeller
We are on the property stretch! All that is still left is to select the propeller for our Piper Cub. Then we can go fly!
I have good news and bad news the following. The bad news is that I do not have an uncomplicated components for estimating which propeller you require. There are just too many variables that will need to be taken into account.
So is NimH dead? Effectively that query can be answered as NO. airsoft gun battery, airsoft gun battery, rc helicopter battery
Battery
My power technique rule states to make the battery about fifteen% of the complete airplane bodyweight. My electric power rule assumes a 6 moment target flight time, which is how prolonged most of us fly. But because of the reduced energy wants in our Piper Cub, 15% presents us sufficient electricity for a nine minute flight. That's fine.
fifteen% of the flying pounds happens out to about eleven.five ounces (330 g). A battery pack with 3 cells in collection is common in this airplane size assortment, so we will go with that. A rapid research on the net demonstrates that a 3S LiPo battery pack with 4000 mAh cells meets our focus on excess weight.
Electrical power
Let's do a quick calculation to see how considerably electricity our model demands to fly. My electricity rule assumes that a sport design needs about 75 watts of power for every pound of flying excess weight. We minimize that again to 50 watts for every pound for our Piper Cub. That indicates we will need 240 watts (4.eight*50). With a three cell battery pack, the output voltage is about eleven.1, which suggests that we require about 22 amps of recent (240/eleven.one).
As a protection check, let's seem at the highest electricity that our motor can produce. Outrunner motors can produce about seventy five watts for every ounce. That is a optimum that commonly we do not want to exceed and ideally, even approach. Our Axi is thus excellent for up to four hundred watts (five.five*seventy five). With our battery pack, that works out to a optimum of 36 amps (400/11.1).
Battery C Rating
Let's make confident our battery can take care of the highest current that we may demand from it. The C ranking of a battery is just the several of its ability that it can tackle in existing stream. If our battery pack ended up to have a C ranking of 10 (which would be quite reduced), then it could be discharged at a 4*ten=forty amp rate. Considering that the maximum recent that our motor can handle is 36 amps, any battery with a affordable C ranking will meet up with our demands.
Digital Velocity Management (ESC)
Picking a very good ESC for our electric power system is uncomplicated. The principal problem is knowing what's the optimum present that we will want. We already know that: 36 amps. Thus a 40 amp pace control will function.
Propeller
We are on the property stretch! All that is still left is to select the propeller for our Piper Cub. Then we can go fly!
I have good news and bad news the following. The bad news is that I do not have an uncomplicated components for estimating which propeller you require. There are just too many variables that will need to be taken into account.
So is NimH dead? Effectively that query can be answered as NO. airsoft gun battery, airsoft gun battery, rc helicopter battery
