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HomeAircraftHelicopterHelicopter Main Discussion › How to set pitch withOUT a pitch gauge
04-23-2009 12:26 AM  9 years agoPost 1
Ghostrider

rrElite Veteran

San Diego, CA

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I saw this over at archeli and thought it was pretty cool!

How To: Set/Check pitch without a gauge

Here are some tricks using basic geometry that you can use to check you pitch setup if you don't have a pitch gauge handy. Using a good quality pitch guage is probably more accurate but these techniques can get you quite close.

First:
* Ensure throttle-hold is on or the motor is disconnected.
* Ensure you have a 0 - 50 - 50 - 50 - 100 pitch curve for the selected flight mode used for this setup.
(The 50 50 50 means you can position the collective stick anywhere near the middle and be sure you have exactly middle collective)

Zero pitch at centre stick
1) Fold the main blades so that they are both at 90deg to the grips and parallel to each other and set your collective to mid-stick. If the tips of the blades are level with each other you have zero degrees. If not, adjust the linkages from the swash up to the head to correct the pitch.

2) Check the tip alignment as you rotate the head. If the tip alignment changes as you go around the circle then your swash is not level. Adjust the links from the servos to the swash to correct and then return to step (1).

Static tracking adjustment
3) Now pull the blades back to their normal straight flying position with one aligned over the boom. Set you collective to mid-stick.
Ensure the flybar is level. Measure the distance of the trailing edge of the blade tip from the boom. Now rotate the head 180deg and repeat the measurement on that blade. If they are not the same then you have a tracking error, adjust your tracking to make them the same.

Approximate Min/Max pitch
4) Fold the main blades so that they are both at 90deg to the grips and parallel to each other. Measure the distance from the blade bolt hole to the blade tip (let's call this "L". Set your collective to low-stick (ensure the flybar is level) and measure the vertical distance between the tips (let's call this "Dmin". Set your collective to high-stick (ensure the flybar is level) and measure the vertical distance between the tips (let's call this "Dmax".

Equal pitch range?
Now if Dmin is not the same as Dmax then you have unequal min and max pitch.

Max pitch angle?
Pitch_angle = inverse_sin( (D/2) / L) )

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04-23-2009 12:41 AM  9 years agoPost 2
tchavei

rrProfessor

Portugal

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I can see this being useful for some flybarless helis for sure, especially the 0 at midstick.

Thx for the info

Tony


--------------------
"Perfection and patience usually walk side by side..."

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04-23-2009 12:47 AM  9 years agoPost 3
Wimbledon99

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UK

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Great tips but would say spending a Fiver on a pitch gauge is worth it.

3D?? No - just another input error!!!

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04-23-2009 12:48 AM  9 years agoPost 4
Ghostrider

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San Diego, CA

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Great tips but would say spending a Fiver on a pitch gauge is worth it.
+1 on that but it's still pretty cool.

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04-23-2009 12:51 AM  9 years agoPost 5
tchavei

rrProfessor

Portugal

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Wimbledon99: I was about to post the same but before hitting the reply I started to think about the possible applications of what Ghostrider wrote and I can see this being very useful on flybarless helis. On a normal heli, you have the flybar to measure against the blade angle but on a flybarless heli, you only have 3 choices: go digital (works great), use bubble levels (hated it) or... use the method described above. THis would have come handy when my Wixey's battery died in the middle of a setup.

Tony


--------------------
"Perfection and patience usually walk side by side..."

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04-23-2009 12:57 AM  9 years agoPost 6
Sean Williams

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Santa Clarita CA

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Or you could just eyeball it...

It's all about how it flys. Just doesn't matter if you have exactly even pitch on each end, you need to tune it after you've flown it.

Just my .02

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04-23-2009 01:16 AM  9 years agoPost 7
mlucia

rrKey Veteran

Essex Jct., Vermont

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Very cool and thanks for the post Ghost !!

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04-23-2009 01:17 AM  9 years agoPost 8
tchavei

rrProfessor

Portugal

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Eyeballing? Whats next? Tuning an engine by ear?

TOny


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"Perfection and patience usually walk side by side..."

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