I'm really proud of this
delete
First ever nose-in hover! Wahoo!
As some Brits are wont to say, I'm quite "chuffed". 
http://www.rcgroups.com/forums/showp...8&postcount=19
Not just hovering, either. Transitions from nose-in to flying circuits, to side-in, to touch-and-goes. All in one battery pack. The last time I flew I was still timidly doing tail-in and side-in hovers.
It was as if some neuron finally made a connection between the "heli" and "airplanes" part of my brain. My reflexes aren't right all the time, but the CX2 is stable enough that it gives me a chance to see and recover from the mistake before it gets expensive.
The Blade CX2 is a neat little heli, and probably the only thing I've ever bought on impulse that I don't regret.
Now we'll see how long it takes to get overconfident. "Pride cometh before the bloody expensive crash".
http://www.rcgroups.com/forums/showp...8&postcount=19
Not just hovering, either. Transitions from nose-in to flying circuits, to side-in, to touch-and-goes. All in one battery pack. The last time I flew I was still timidly doing tail-in and side-in hovers.
It was as if some neuron finally made a connection between the "heli" and "airplanes" part of my brain. My reflexes aren't right all the time, but the CX2 is stable enough that it gives me a chance to see and recover from the mistake before it gets expensive.
The Blade CX2 is a neat little heli, and probably the only thing I've ever bought on impulse that I don't regret.
Now we'll see how long it takes to get overconfident. "Pride cometh before the bloody expensive crash".
My own FAQs for motors
Gathered here are some rules of thumb and links to discussions for electric motors. I'm putting things here so I don't have to search. There will likely be many, many edits of this post.
Posted by Nethole:
Definitions:
Rm = "Rm is the copper resistance of one motor phase"
Calculating or measuring Rm
DIY Rig to measure Rm
Nice post describing Kv and Kt (the entire thread is interesting)
Rules of thumb:
More winds on a given motor will increase torque and decrease Kv. I believe this is because the magnetic field with more turns is stronger (attracting/repelling magnets with greater force). Since the inductance is also greater, the field cannot expand/collapse as quickly which will limit how fast the motor can commutate.
Switching from wye to delta increases the Kv by a factor of 1.732 (the square root of 3).
Delta= higher Kv, wye = lower Kv. (thanks to B.L.E., from whom this is "borrowed".)
Measuring Motor Constants discussion.
Nice chart on equivalent wire gauge when using multiple strands.
Posted by Nethole:
Quote:
|
Originally Posted by Nethole
Please see "Understanding Electric Power Systems". All questions are answered there.
Part 1 http://www.rcgroups.com/articles/ezonemag/1998/sep/ctower/jtb0998.htm Part 2 http://www.rcgroups.com/articles/ezonemag/1998/oct/ctower/jtb1098.htm Part 3 http://www.rcgroups.com/forums/showthread.php?p=4027209&highlight=control+tower+r pm+kv+motor#post4027209 Part 4 http://www.rcgroups.com/forums/showthread.php?p=4027214&highlight=control+tower+r pm+kv+motor#post4027214 Part 5 http://www.rcgroups.com/forums/showthread.php?p=3347754&highlight=control+tower+r pm+kv+motor#post3347754 part 6 http://www.rcgroups.com/forums/showthread.php?p=4027225&highlight=control+tower+r pm+kv+motor#post4027225 |
Definitions:
Rm = "Rm is the copper resistance of one motor phase"
Calculating or measuring Rm
DIY Rig to measure Rm
Nice post describing Kv and Kt (the entire thread is interesting)
Rules of thumb:
More winds on a given motor will increase torque and decrease Kv. I believe this is because the magnetic field with more turns is stronger (attracting/repelling magnets with greater force). Since the inductance is also greater, the field cannot expand/collapse as quickly which will limit how fast the motor can commutate.
Switching from wye to delta increases the Kv by a factor of 1.732 (the square root of 3).
Delta= higher Kv, wye = lower Kv. (thanks to B.L.E., from whom this is "borrowed".)
Measuring Motor Constants discussion.
Nice chart on equivalent wire gauge when using multiple strands.
The cheap Blade CX2 radio does CCPM mixing!
This is a nice, unexpected bonus.
There's a lot of potential in the TX and RX from this kit.
Range may be limited - the TX RF board is postage-stamp sized, and it's hard to imagine that it's capable of putting out much power.
But it looks entirely reasonable that I could separate the reciver module from the ESC/BEC/mixer/gyro board from this kit and "go separates", making my Hummingbird Pro CP a 2.4GHz machine without a lot of hassle.
The CX2 wouldn't need to be grounded, either; any 72MHz receiver could be attached to the ESC/BEC/mixer/gyro to keep it flying.
There's a lot of potential in the TX and RX from this kit.
Range may be limited - the TX RF board is postage-stamp sized, and it's hard to imagine that it's capable of putting out much power.
But it looks entirely reasonable that I could separate the reciver module from the ESC/BEC/mixer/gyro board from this kit and "go separates", making my Hummingbird Pro CP a 2.4GHz machine without a lot of hassle.
The CX2 wouldn't need to be grounded, either; any 72MHz receiver could be attached to the ESC/BEC/mixer/gyro to keep it flying.
