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HomeAircraftHelicopterMain Discussion › Help: Rudder input not working
10-30-2011 12:21 PM  6 years agoPost 1
bluefronted

rrVeteran

Pretoria, South Africa

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Hi Guys,

I'm battling with one of my 450's.I did a flight with it this morning and she flew ok, It was her maiden flight with me, bought her second hand.
For some reason when i give right rudder it does not work.( the tail blades move in the correct direction when i give right rudder)
Whilst spooling up the nose rotates slowly anticlockwise, when i give right rudder it does not make a difference.
The heli has a FBL head with CGY750.The rudder limits are set to max in eighter direction, so there is enough travel.

Note I have another 450 setup identical and it works.
Any iea what is causing the problem

Thanks

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10-30-2011 12:49 PM  6 years agoPost 2
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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With tail blade perpendicular to boom with trailing edge facing towards front of heli,You move stick to left and right and trailing edge moves in same direction ? also when you drag tail to left or right the trailing edge also moves in same direction ?If all works correctly on bench and not in flight you might have a binding issue and servo cant pull thru.

I stole it ,flew it and gave it back ;)

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10-30-2011 01:00 PM  6 years agoPost 3
helixangle

rrKey Veteran

Mamaroneck, NY - USA

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if you disconnect the servo ball link can you move the tail pitch with the tail control rod, and is it smooth, and I mean buttery smooth, you first have to eliminate the possibility that there is mechanical binding in the tail.

do you have the directions for the cy750? If you don't get a copy online, re-setup the tail throws so you have full travel IN THE TAIL, without binding the servo on the end points.

At middle rudder stick, is your servo horn set in the correct position? On a 450 the servo horn at middle rudder stick should be 90 degrees from the length of the servo

A tail needs between 3 and 5 degrees of right rudder pitch at middle rudder stick, some gyro's don't require this, MOST do. If you don't have the required pitch at center rudder stick you can have inconsistent pirouette rates

hope this helps

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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10-30-2011 03:11 PM  6 years agoPost 4
bluefronted

rrVeteran

Pretoria, South Africa

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Hi Guys,

I found the fault. I held the tail blades and tried moving the main blades and noticed that they did turn. Something fishy, so I removed the tail side gear box and re-seated the torq tube on both sides, waalaaa and now the rudder controls, seems that somehow the torq tub was not seated properly hence not transferring all the power to the tail , hence the poor control.

Now I need to figure out why did the torq tube move.

Thanks for the assistance

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10-30-2011 03:45 PM  6 years agoPost 5
Thumpernator

rrKey Veteran

Senoia, Georgia, USA

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I held the tail blades and tried moving the main blades and noticed that they did turn.
Had the same thing happen when I built my first 600. Found I didn't have the tail boom fully seated into the body. Not familiar with the 450, but thought I'd mention it in case they're similiar.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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