errr....what's the boundary between an autorotation and just killing the throttle at a low height, in this case? I've done a rough "autorotation" with my CP2 by quickly closing the throttle at a small height, but I don't know if that's the real thing...
an autorotation is when I use the inertia in the rotor to land a heli without motor power. With a bigger heli, one would also use negative collective pitch and forward speed to build up headspeed during the descent.
Look closely, just before it touches the ground. It doesn't drop like a rock, but settles gently (well, more or less).
You can't do autorotations with CX2 or any other fixed pitch heli, sorry. It requires variable pitch.
Thanks for the detailed reply, however I'm not a (complete) noob when it comes to rc helicopters, I fly a Honey Bee CP2 (that's a CP heli with an ETRM). I also know what an autorotation is...well...at least some people would only classify "full down, controlled autorotations" as "true" autorotations, e.g. with headspeed, negative pitch, controlled gliding, then flaring + positive pitch...what you did is more like killing the throttle while in a hover. Is there a name for that kind of auto?
OK, the CP2 can't "properly" autorotate because even if it's CP it has no one-way bearing, you can't control motor + pitch independently (it's CCPM with a preset pitch curve), and has zero tail control with the tail motor off. Killing the throttle at hover height results however in a "pseudo" autorotation, with the pitch of the blades remaning positive enough to convert inertia into lift, and so landing somewhat softly. Of course, it also starts spinning when doing that :-(
oh sorry I got confused over your heli. The CX2 I had in mind is a coax :-)
I agree, a "proper" autorotation would maintain headspeed by using negative pitch, but it doesn't work too well with this small heli. I've had some emergency landings from 10..30 meters with a broken belt without further damage, but they weren't pretty...
not much energy there aye
heliboy89 2 years ago
errr....what's the boundary between an autorotation and just killing the throttle at a low height, in this case? I've done a rough "autorotation" with my CP2 by quickly closing the throttle at a small height, but I don't know if that's the real thing...
Velktron 3 years ago 2
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Hello,
an autorotation is when I use the inertia in the rotor to land a heli without motor power. With a bigger heli, one would also use negative collective pitch and forward speed to build up headspeed during the descent.
Look closely, just before it touches the ground. It doesn't drop like a rock, but settles gently (well, more or less).
You can't do autorotations with CX2 or any other fixed pitch heli, sorry. It requires variable pitch.
mnentwig 3 years ago
Thanks for the detailed reply, however I'm not a (complete) noob when it comes to rc helicopters, I fly a Honey Bee CP2 (that's a CP heli with an ETRM). I also know what an autorotation is...well...at least some people would only classify "full down, controlled autorotations" as "true" autorotations, e.g. with headspeed, negative pitch, controlled gliding, then flaring + positive pitch...what you did is more like killing the throttle while in a hover. Is there a name for that kind of auto?
Velktron 3 years ago
OK, the CP2 can't "properly" autorotate because even if it's CP it has no one-way bearing, you can't control motor + pitch independently (it's CCPM with a preset pitch curve), and has zero tail control with the tail motor off. Killing the throttle at hover height results however in a "pseudo" autorotation, with the pitch of the blades remaning positive enough to convert inertia into lift, and so landing somewhat softly. Of course, it also starts spinning when doing that :-(
Velktron 3 years ago
oh sorry I got confused over your heli. The CX2 I had in mind is a coax :-)
I agree, a "proper" autorotation would maintain headspeed by using negative pitch, but it doesn't work too well with this small heli. I've had some emergency landings from 10..30 meters with a broken belt without further damage, but they weren't pretty...
mnentwig 3 years ago
Great !!
maki211971 3 years ago
wow that thing loses head speed quick.
peisen 3 years ago
And then again, maybe not.
Jetleaf 3 years ago