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Home✈️Aircraft🚁HelicopterBeginners Corner › Setting neg/pos pitch
06-20-2009 03:14 PM  11 years ago
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Ausable

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Montreal, Quebec

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Setting neg/pos pitch
Ok, I place the pitch gague on the edge of the main rotor, If I want 8neg pitch I set that on the pitch gague the I make sure I am at center stick, then do I make the changes on the Radio?Then I do the same thing with the pos pitch.
Can someone help me out with a video etc.
Thanks
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06-20-2009 04:13 PM  11 years ago
rotormonkey

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Ottawa, ON - Canada

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No video help here, but I can try to describe it.

Generally the aim is to have 0 degrees at center stick, and the same amount of negative at full bottom stick as you have positive at full stick.

That being said, here's what you do. In the radio, make sure your pitch curve is linear. 0% - 100%. Put the pitch gauge on the blade, put your stick on the radio at center, and adjust the physical linkages in the head until you have 0 degrees at mid stick.

Now measure how much negative pitch you have without changing anything, and measure positive. They should be equal, if not, fiddle with linkages until they are, and go back and make sure you have 0 degrees at mid.

All that should cover the mechanical setup. From there on out it'll be radio programming. So if you have 8 degrees +/-, and you want more, you'd increase the pitch in your swash mixing menu. Increase until you have the MAX pitch you'll want in any flight mode.

From there you can use pitch curves to fine tune whatever you want. Suppose you want only -3 degrees in normal mode, and 10 degrees positive, but you initially set up with 12 degrees max positive and negative, you might set up your pitch curve like this:

40% - 50% - 90%

Those were numbers I just pulled out of my butt. To get the actual degrees of pitch, you'd have to put the pitch gauge back on and check what you get once you've played with the pitch curve, and continue to adjust your curve as necessary from there.

Clear as mud?
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06-20-2009 06:20 PM  11 years ago
Gyronut

rrProfessor

Martinsville In.

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Everything Monkey said plus make sure the flybar is level.Rick
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06-23-2009 02:12 AM  11 years ago
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Brian, we set your negative by changing the pitch curve on the negative, if you want, in normal mode, the same neg. pitch as in idel up, goto pitch curve, normal mode, and set it to 0, 25, 50, 75, 100, and that is it.Team Synergy, Rail blades, Team Scorpion, V-Team
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06-23-2009 02:35 AM  11 years ago
duceduc

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Saitama-Ken, Japan

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Everything Monkey said plus make sure the flybar is level.
Correct me if I am wrong. It doesn't really matter if the flybar is level. Just make sure the pitch guage is parallel with the flybar before reading the pitch. True?
Duc S
Do It! Do It!™
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06-23-2009 02:52 AM  11 years ago
Dood

rrProfessor

Wescanson

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Correct me if I am wrong. It doesn't really matter if the flybar is level. Just make sure the pitch guage is parallel with the flybar before reading the pitch. True?
No, not necessarily.

If you had a 1:1 flybar ratio then you'd be OK, but for helicopters that don't have a 1:1 flybar ratio, you'd have everything all screwed up
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