BladeCX response question....

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sam - 21 May 2006 16:04 GMT

I've had a Blade CX for a few months now, loving it. As I've started to
become more proficient with it, I'm noticing the details more and more.
I've moved my control arms out by one notch on the servo horns and
gotten better response (less sluggish). One thing I've noticed is that
from a hover, if I move the pitch forward all the way, the heli takes
off forward.....but after about twenty feet, returns almost to a
complete hover. Any ideas what might be causing this? If I return the
stick to vertical, then move it forward again, it repeats.

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The OTHER Kevin in San Diego - 21 May 2006 17:38 GMT

>I've had a Blade CX for a few months now, loving it. As I've started to
>become more proficient with it, I'm noticing the details more and more.
[quoted text clipped - 4 lines]
>complete hover. Any ideas what might be causing this? If I return the
>stick to vertical, then move it forward again, it repeats.

Retreating blade stall. Once you get moving too fast, the retreating
blade's relative wind isn't fast enough to produce enough lift to
provide thrust in the forwward direction. The nose will pitch up and
slow the helicopter. In a typical helicopter config, the helo will
also roll in the direction of the retreating blade. Since you've got
a counter-rotating system, you've got two retreating blades, so no
roll. The recovery is to slow down. It's kind of self-correcting

There's a lot more going on there, but I think if I explained it,
you'd just get confused. I'd be more than happy to delve deeper into
it at another time. I've got an R22 waiting for me at the airport.

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sam - 22 May 2006 02:01 GMT

> Retreating blade stall. Once you get moving too fast, the retreating
> blade's relative wind isn't fast enough to produce enough lift to
[quoted text clipped - 7 lines]
> you'd just get confused. I'd be more than happy to delve deeper into
> it at another time. I've got an R22 waiting for me at the airport.

Thanks for the explanation Kevin....that makes perfect sense. This is
the kind of stuff I'm trying to learn now that the basic flight stuff is
getting more routine. Understanding stuff like this is really helpful.

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The OTHER Kevin in San Diego - 22 May 2006 02:52 GMT

>Thanks for the explanation Kevin....that makes perfect sense. This is
>the kind of stuff I'm trying to learn now that the basic flight stuff is
>getting more routine. Understanding stuff like this is really helpful.

Anytime. This is a web site that I really like. It explains a lot of
what's going on with the rotor systems in relatively plain english and
good diagrams.

http://www.dynamicflight.com/aerodynamics/

Feel free to pester the group with questions. You might also want to
visit rec.aviation.rotorcraft to talk with a few more full scale guys.

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Model Forum / Radio Controlled / Helicopters / May 2006

BladeCX response question....