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Re: Position Blades and Pitch Gauge in Wizard
Posted: Mon 29. Jun 2020 16:20:13
by Pino74
xoexoe wrote: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.
hello I tried to translate but I did not understand what rake means.Excuse me but I have a huge effort I have to translate and I don't always understand everything
Re: Position Blades and Pitch Gauge in Wizard
Posted: Mon 29. Jun 2020 16:25:33
by xoexoe
Raked means the skids of the helicopter make boom unlevel when the heli is just sitting there. Look at these pics I just make. My heli is raked 3 degrees.
Re: Position Blades and Pitch Gauge in Wizard
Posted: Mon 29. Jun 2020 16:29:56
by xoexoe
^ Hope those picture helped. Is your heli raked? If so all blade pitch measurements must be done relative to a surface that is perpendicular to the main shaft. For a raked heli, the table surface will not work since the table is not perpendicular to the main shaft.
But the boom should be perpendicular to the main shaft. That is why it’s a good place to zero your pitch gauge there.
Re: Position Blades and Pitch Gauge in Wizard
Posted: Mon 29. Jun 2020 16:48:09
by buttles
If the swash is level with the mainshaft then rake is irrelevent in the setting up procedure as all measurements are done with the master blade set along the boom. As long as the gauge is zeroed to the side of the heli then all will be good.
Re: Position Blades and Pitch Gauge in Wizard
Posted: Mon 29. Jun 2020 16:50:47
by Pino74
xoexoe wrote:^ Hope those picture helped. Is your heli raked? If so all blade pitch measurements must be done relative to a surface that is perpendicular to the main shaft. For a raked heli, the table surface will not work since the table is not perpendicular to the main shaft.
But the boom should be perpendicular to the main shaft. That is why it’s a good place to zero your pitch gauge there.
Thanks I solved it.I understood where the recommendation was wrong.I have attached a small drawing.in practice you were right the main shaft is not perpendicular to the table but has a forward angle of about 3.5-4 °. This is what I noticed when I reset the pitch gauge on the table, while I had to do it on the tail.
Now I have zero degrees in any position.
I had already understood this thing, but in the measurements I forgot it and I fell into the same error again.
However I solved thanks to all
Re: Position Blades and Pitch Gauge in Wizard
Posted: Mon 29. Jun 2020 17:45:13
by buttles
I'm hoping not to confuse things but the tail boom isn't the best place to zero the gauge. The gauge needs to be zeroed in the same plane as it will sit on the blades. The side of the heli is normally best on an upright surface or across the frame halves.