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HelicopterCentury Radikal G20-30 N640 Hawk Predator › About autos and ideal pitch value....
06-03-2010 02:06 PM  7 years agoPost 1
HarveyR

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France - North

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Anyone know what the ideal blade angle is when you do an auto?

Basically, I never know when I stall if I should pull the stick right down (-12°), or go halfway (-6°) or just slightly (-2°)...

I guess theoretically the less negative pitch should be best (like -2°) because at constant air speed (heli dropping) the smaller the angle the faster the blades must turn.

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06-03-2010 03:52 PM  7 years agoPost 2
Zman

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Florida

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Harvey,

There are a few variables to consider when answering this. First off, what is the altitude of heli when its time to auto. If it is only 10-15 feet up, just give it enough negative to "hurry" it down and then flare it.
If from up high, when I hit hold, I go to midstick (zero) and then start feeding in more negative until I "hear" the blades "come to life" so to speak. Every heli will have its own sweet spot due to differences, weight, blades just to name a a couple.
But you definetly dont want to jam a bunch of negative in as too much will actually slow blades down. As I said, find the sweet spot from up high. When I am teaching people to auto, one of the first thing I have them do is fly in normal mode on a throttle curve (no gov)and from a 100 feet or so bring stick back to idle and have the pitch set around -5 degrees. At about 20-30 feet, I have them do a flare so they can see how the blades will pick up speed. Towards the end of flare, I have them just add left stick and go back up. As they get more and more comfortable, I bring them down lower before the "bail out". Finally, I just have them hit hold and complete the manuever. And always, if possible, auto into the wind.

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06-03-2010 04:44 PM  7 years agoPost 3
oldfart

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Vancouver, Canada

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But you definitely don't want to jam a bunch of negative in as too much will actually slow blades down. As I said, find the sweet spot from up high. When I am teaching people to auto, one of the first thing I have them do is fly in normal mode on a throttle curve (no gov)and from a 100 feet or so bring stick back to idle and have the pitch set around -5 degrees. At about 20-30 feet, I have them do a flare so they can see how the blades will pick up speed. Towards the end of flare, I have them just add left stick and go back up. As they get more and more comfortable, I bring them down lower before the "bail out". Finally, I just have them hit hold and complete the maneuver. And always, if possible, auto into the wind.
I also have found that to be a good and safe method to teach the auto, as it builds up the fellows confidence in that both the machine and himself are easily capable of performing the sphincter tightening maneuver. As he finds there is no need for the tightening of the sphincter his confidence soars, and his brain stays working, thus eliminating brain farts and brain freezing.

To help insure the success of their first complete autos, I will also suggest they initially set up their throttle hold pitch curve to have only a -3 to -4 (heavier disc loaded models to -3 and lighter ones to -4)at bottom stick.

Later, when they get comfortable with al upright autos and have learned to maneuver the heli through 180 autos etc. and then want to try more aerobatic autos I will then have them go to a full 3D pitch curve in the auto mode.

Phil

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06-03-2010 05:16 PM  7 years agoPost 4
HarveyR

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France - North

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From what I gather here, the sweet spot will likely be somewhere around -3° or -4°. So when I auto, the stick should mostly be somewhere between mid stick (0°) and 1/4 stick (approx -5°), my job to find the best point around there (but definitely not -10°).

Thanks, that gives me a good starting point and maybe next time I stall I'll be more advised.

I never really train autos because I very rarely stall to start with and the few times I've trained them I've found it pretty risky. Maybe once the funnels are fine I'll have some more goes at this.

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06-03-2010 05:34 PM  7 years agoPost 5
Zman

rrKey Veteran

Florida

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Harvey,

I do encourage you to learn autos. Besides being fun, it will save your heli one day. If you ever loose tail control, hitting hold will really slow things down and give you a chance. This is just one example.

Good luck

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