Blade Pitch Setup

[JonHC]

Hi All,

I've recently setup my blade pitch and I've got both blades setup to a perfect 0 degrees at 50% throttle. I've noticed though when I came to checking the tracking, which was good, that as the blades start to spin up, they 'drop' slightly for a second, as if the air is pulling them down, then return to their normal position. Is this normal behaviour?

I followed a video on YouTube from a guy called Nuttcaze and one of his points was to have the idle up switch set to on whilst setting up the pitch. Is this correct as I haven't seen this mentioned on other setup guides.

I am new to RC helis, so much so that I haven't even flown yet, well, apart from when I first got it and promptly stuffed it into the ground. I have now joined a club in the hope of getting some training.

Thanks for your help.

Jon

[Weebl]

If your idle up curve and your normal curves are the same, then there is no point being in idle up.

Don't know about the dropping blades before they track, but as you are spooling up through the lower percentages your pitch will be negative, so causing the blades to 'drop' a bit before you hit 50% and neutral pitch. Is this what you are seeing?

[JonHC]

Yep, that's what I'm seeing. It's literally just for a few revolutions as it's starting to spool up then returns to normal way before I get to 50%

[Weebl]

Yep, that's what I'm seeing. It's literally just for a few revolutions as it's starting to spool up then returns to normal way before I get to 50%

That's what it is then, you are in negative pitch at that point so the blades are trying to drive the heli into the floor. They can't so the blades deflect a bit.

Either that or you mean right at the start, in which case the blades are hanging at their resting position before centripetal force takes over and they float at their centred position.

[JonHC]

Your first point will be right, they drop lower than their resting position.

Cheers Weebl

[lex7919]

Just a mention on the video, idle up is mentioned because traditionaly in normal mode you would likely have a non linear curve so there is good chance that half throttle 50% is no longer 0'pitch , and as a idle curve isusually linear 0-100 the cehtre point at 50% is still 0' pitch, it's just a way to set up without having to reset your normal curve after setting up.