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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Flybar and Head Question
03-30-2010 09:55 PM  10 years ago
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orion1210

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UK

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Flybar and Head Question
Hi,

I was wondering, in general terms, if you had say 20deg see-saw movement on your fly bar if in flight it ever actually moves that far, even with a full stick input.

The reason i ask is that i've just upgraded my millennium mainblade grips and they've turned out to be dimensionally different. This causes the available see-saw movement on the flybar to be reduced, due to some binding at anything more than +-8deg collective.

Do you think i'd notice in flight or could it even be disastorous? I honestly think it may of been a problem prior to upgrade but i've never noticed it on the bench.

I'd be very grateful if you don't know off the top of your head to physically see on your helis if the flybar travel is restricted at large pitch numbers.

Many Thanks
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03-30-2010 11:20 PM  10 years ago
rotormonkey

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Ottawa, ON - Canada

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I would expect that it depends on your cyclic throws, and flybar ratios, and the size of your paddles.

I'm no expert, but I would start by checking cyclic pitch. Say you have 8 degrees. Now keeping the sticks at neutral, can you still get 8 degrees of pitch on the blades by tilting the flybar before it binds up? If yes, then you should be good. If no, then reduce your cyclic pitch.

Anyone see any flaw in that method? Seems like it'd be a safe bet to me... I could be wrong
If it can't hover, it ain't worth flying.
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03-31-2010 01:15 AM  10 years ago
Yug

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UK. Herts

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The flybar will never achieve those maximums due to the centripetal forces far outweighing the effects of the resultant paddle pitch forces. It also depends on how aggressive your setup is and how aggressive your flight profile demands.Vegetable rights and Peace
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03-31-2010 06:57 AM  10 years ago
orion1210

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UK

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Thanks guys,

My milli head allows me to limit the seesaw to 12deg mechanically, which should prevent the binding in the head rods/links. Do you think I'd be better off doing that?
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