kv rating on brushless motors?
#1
Tech Apprentice
Thread Starter
kv rating on brushless motors?
am i understand the kv rating on brushless motors? it seems that the lower the kv the more suited for racing it is. so lower kv = faster motor or vise versa?
i'm new to brushless so this would be useful knowledge in picking a motor
i'm new to brushless so this would be useful knowledge in picking a motor
#2
KV is how many times the motor spins for every volt applied.
so a 3300kv motor, off an 11.1v lipo, spins at about 36,000rpm max.
while a 5700kv motor off 7.4 volt will spin at about 42,000rpm max.
a higher number motor will spin faster for the same given voltage.
opposite to what you said.
so a 3300kv motor, off an 11.1v lipo, spins at about 36,000rpm max.
while a 5700kv motor off 7.4 volt will spin at about 42,000rpm max.
a higher number motor will spin faster for the same given voltage.
opposite to what you said.
#3
lower KV= slower, more torque
Higher KV= faster, but less torque
look for somthing under 5000kv for racing
#4
Tech Initiate
Or do it this way to get a rough idea multiply thr kv by how many volts your battery is
eg - 2s lipo (7.4v) and a 8.5 turn 5000kv motor
7.4 x 5000 = 37000 rpm roughly
so if you use a 3s lipo its 55500rpm and that very very fast so yo can mix and match batterys and motors and gear ratios to tour needs ....
Wat are you runnig ? off road on road ?
#5
Tech Apprentice
Thread Starter
Your right about the lower the kv generely = more rmp from the motor ...
Or do it this way to get a rough idea multiply thr kv by how many volts your battery is
eg - 2s lipo (7.4v) and a 8.5 turn 5000kv motor
7.4 x 5000 = 37000 rpm roughly
so if you use a 3s lipo its 55500rpm and that very very fast so yo can mix and match batterys and motors and gear ratios to tour needs ....
Wat are you runnig ? off road on road ?
Or do it this way to get a rough idea multiply thr kv by how many volts your battery is
eg - 2s lipo (7.4v) and a 8.5 turn 5000kv motor
7.4 x 5000 = 37000 rpm roughly
so if you use a 3s lipo its 55500rpm and that very very fast so yo can mix and match batterys and motors and gear ratios to tour needs ....
Wat are you runnig ? off road on road ?
im looking for a good medium for torque and speed and from what a friend suggested i should go with the 2650 for that balance. let me know if i am incorrect in my thinking on this.
Last edited by Southern_Rebel; 01-15-2010 at 02:55 PM. Reason: adding info
#6
Tech Initiate
#7
Tech Initiate
off road...mainly bashing...i was looking at the tekin rx8/t8 combo 2650kv with 5000mah 4s 30c lipo giving 39220rpm. be going in a team associated rc8.
im looking for a good medium for torque and speed and from what a friend suggested i should go with the 2650 for that balance. let me know if i am incorrect in my thinking on this.
im looking for a good medium for torque and speed and from what a friend suggested i should go with the 2650 for that balance. let me know if i am incorrect in my thinking on this.
#8
Tech Apprentice
Thread Starter
the turnigys are the ones i was looking at. at first i was looking at the zippys but hear better things about the turnigys so i'm going that way. this is my first brushless conversion.
also i hear about people have just as good of luck with the drag brake and not even worrying bout the mech brakes.
also i hear about people have just as good of luck with the drag brake and not even worrying bout the mech brakes.
#10
yeah, I'm planning on running a 2200kv, in a firestorm, off 4-6 cell lipo, with a 18 - 24T pinion...
should be... scary haha
should be... scary haha
#11
Tech Apprentice
Thread Starter
with more research and recomemdations i decided on going with the 2250kv from tekin redlin rx8/t8
#12
lower kv on more Volts = less heat if geared for the same speed as more kv with less Volts.
I am very happy with 1700kv motor on 5S.
4S is too much heat to worry about
6S can stress speed controls during braking
I am very happy with 1700kv motor on 5S.
4S is too much heat to worry about
6S can stress speed controls during braking
#13
Suspended