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MondoMor's blog
Posted by MondoMor | Jan 11, 2007 @ 04:19 PM | 1,943 Views
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Posted by MondoMor | Dec 22, 2006 @ 04:34 PM | 2,192 Views
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".
Posted by MondoMor | Dec 21, 2006 @ 05:14 PM | 2,125 Views
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 MondoMor | Dec 15, 2006 @ 07:16 AM | 2,524 Views
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.