Hi everyone

After a crash I am remaking the Wizard for my Heli, but there is something that does not come back to me on the 6° tuning Geometry.
Before I get to describe this problem I want to understand the previous step in the wizard.
When I am in step 7 of the wizard, after leveling the plate, it is written that if everything in order I should have zero pitch to the blades, okay.

but the doubt is this. in which position of the blades should I have zero pitch?
I have attached photos.
the pitch changes according to the position of the blades, longitudinal to the tail or at 90 with respect to it.
The photos are numbered. In which position should I measure 1 or 2?
Thanks

Pino

you should have 0° pitch in any position of the blades
if this is not true, then the swash is not well leveled

HI Pino74,
generally is pitch collective., thats mens its identical like pic 1or pic2 -
I do this all the time like in pic 1 there you can Do nothing wrong !
Some other FBL need adjustments like in pic 2 but not the spirit -

Hello the problem and that the pitch values ​​are not equal between the 4 points 90 180 270 360
If I put the blades at zero pitch as in figure 1, I find the pitch with a value of 2-4 degrees more than in figure 1, if I then measure as in figure 2.

Basically I have zero pitch only in two points or 90-270 ° or 180-360 °

It depends where I want to take the initial zero pitch.
if I take it as in figure 1, I will find myself zero in 90 and 270.
If I take zero pitch as in figure 2 I will find myself zero only on 180-360.


Another important thing in measurements

When I use the pitch gauge and I measure as in fig2 if I measure zero at that position, 0 °, then I have to turn the other blade which is placed 180 ° in front of me and make it come towards me, so I insert the pitch also on that shovel and I find myself zero even on it.

But my position never changes, I always have the heli in the same position, I am also always in the same position. I just did a turn of the blade from 180 to zero, and then I measure it

Thanks

If you have differt values in pitch by turning around the rotorhead, there are two possibilities, first your swashplate is inproper leveled (cyclic input) or the mainshaft is bended - In my opinion you should take a digital gauge, bacause you can see the differences immediately -
If I will do a setup, I will do at first level out the mainshaft in all four directions - that means, you can turn the rotorhead in every position and you have every time the same angle at the pitch gauge displayed-
If you then adjust the pitch you will have same displayed thrue the circle (rotating rotorhead) -

Try that in this way and you will see, that i works -

How did you level the swash in relation to the mainshaft? Only really good way is with a swash leveller on the three servo links.
Position 1 for your blades in all steps and use the same blade for all angle checks. You then adjust the other blade later in flight checks to get any minor tracking errors removed.The problem with using a bubble level is being sure the heli frame and bubble are the same. A zeroable digital level is well worth the money.

I'm uploading a little video so everything is much clearer

just wait 30 minutes

Thanks

https://www.youtube.com/watch?v=1S01jAQWBr0


there are 4 degrees of difference. I start with 0.02(at the 90 ° position) and I end with 4 °(at the 0 ° position).

if I measure (270 ° position ) I have the same value as the (90 ° position), i.e. 0.02 about... pitch


vice versa if I measure at the (0 ° position) I have 4 ° of pitch, and also at the (180 ° position) always 4° of pitch.
so I exclude the incorrect leveling of the plate . I measured it in a maniacal way.
with aluminum swash leveler and magnifying glass. all perfect it's all new. even the main shaft is new and the spindle is also new.

Hello,

your table is definitly not leveled, that's why you get some different values! If you turn 90 degree your tabe ist not leveled in this direction where you get the displayed 4,1 ° -
Set the digital pitchgauge on your tabe in the two directions and you will see the differnt angle. This has nothing to to with the heli !

Is your heli raked? Meaning, is your boom unlevel to the table when you set the heli down because the skids make the front end lower? If your heli is raked then of course your pitch values will be different when your blades are in different positions.

My Oxy helis are raked so I must deal with this every time, but it’s easy.

First zero your pitch gauge to the boom. This is important! Then when checking zero degrees blades at 0 pitch channel, make sure the pitch gauge is oriented in the same way as it was when you zeroed it. So if the digital readout of your level is on the port side of the heli when you zero it against the boom, the digital readout must again be on the port side.

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