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HomeAircraftHelicopterThunder TigerOther › Not Sure My Pitch Mechanism Is Correct
05-02-2005 02:21 PM  13 years agoPost 1
nheather

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Horsham, West Sussex, UK

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I have built and set up my Raptor V2. All looks good and according to built in pitch curve a get full and equal postive/negative pitch with 100%ATVs with 0 degs sat nicely at mid stick.

I am about to setup the pitch curves to suit my begginer's level of flying (-2 to +10) for normal and (-6 to +10+) for auto, and I've noticed something that doesn't seem right.

I have the blades pointing port/starboard so that I can hang the pitch guage on the blade root.

With the stick in mid-position the blades looked to be about 0degs but then I noticed that if I take hold of the blade it freely moves throughout the whole pitch range.

I haven't got the flybar locked at this stage and realise that if I do then the blades become locked also - but I can't get my head around that without the flybar locked, the blades can flop around to whatever pitch 'they' want. Is this correct or have I missed something in the build.

Cheers,

Nigel

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05-02-2005 03:24 PM  13 years agoPost 2
Drunk Monk

rrProfessor

Preston, UK

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What pitch gauge have you got?


Stephen

I only open my mouth to change feet.....

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05-02-2005 03:40 PM  13 years agoPost 3
BarracudaHockey

rrMaster

Jacksonville FL

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Use the pitch gauge in relation to the flybar. On the Rappy it doesn't matter if its locked or not, if the blades move, so does the fly bar, and on the Raptor is 1:1 ratio so they move the same amount.

Andy
AMA 77227
http://www.jaxrc.com

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05-02-2005 03:41 PM  13 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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On 2nd thought, Stephen is correct, if your using the robart gauge with a level then you need to lock the flybar, if your using a helimax or something that sights on the flybar, then it doesn't matter.

Andy
AMA 77227
http://www.jaxrc.com

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05-02-2005 04:57 PM  13 years agoPost 5
nheather

rrKey Veteran

Horsham, West Sussex, UK

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My query wasn't about how to use the pitch guage. (Mine is the Irvine which requires the flybar to be level).

It was just trying to understand the mechanics. Without the flybar locked the blade be moved freely to any pitch regardless of the position of the throttle stick.

If this is correct, what causes the blade to stick at 5deg (say) when in hover and the flybar isn't fixed?

I've set my pitch curve now - out of interest it aligned very well with the built in pitch guide.

Cheers,

Nigel

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05-02-2005 05:14 PM  13 years agoPost 6
tyuditsky

rrApprentice

Where the grass is green and the girls are Pretty.

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When you're "flopping" these blades and changing the pitch, is the flybar also moving around? It better be, otherwise there's definately a problem.

the flybar will tilt back and forth freely, showing what would appear to be a change in pitch, but if you're lining up the pitch gauge to the flybar, then the pitch really isn't changing.

Test, idle the heli on the ground, lean the flybar to one extent, slowing add throttle, it won't take long and the flybar will level itself out. The pitch in the blades will remain the same in relation to the flybar the whole time. If you're sighting the pitch relative to the ground, then yes, it will be changing.

Centrifigal force is what will keep the flybar level. The force of it spinning will bring it back to an angle perpendicular to the axis it rotates about.

Evo90, HyperRaptor, T-Rex

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05-02-2005 05:20 PM  13 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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The short answer to your question is centrifual force. The spinning blades and flybar are a gyroscope that resists changes. When you input a control, the flybar (and blades) induce a change in lift distribution and off you go.

Andy
AMA 77227
http://www.jaxrc.com

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05-02-2005 05:36 PM  13 years agoPost 8
nheather

rrKey Veteran

Horsham, West Sussex, UK

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tyuditsky

Yep, the flybar moves with it.

barracudahockey

I guessed it must be something like this.


My previous heli was a Hawk Sport and I'm pretty sure that work in the same way. I seem to remeber that the blades were more directly linked to the pitch servo and if you manually changed the pitched of the blades then pitch servo resisted (if turned on) or moved (if turned off).

Different design I guess - took me by surprise.

Cheers,

Nigel

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