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07-19-2002 06:54 AM  16 years agoPost 1
Sceadu

rrApprentice

Corona, CA

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I have the 9C and a Sceadu CCPM. With no mixes set up, when I apply cyclic control the pitch moves slightly. Is this common? or is something wrong?

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07-19-2002 07:11 AM  16 years agoPost 2
Sceadu

rrApprentice

Corona, CA

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I have no reason to rush it.

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07-19-2002 09:31 AM  16 years agoPost 3
Carps

rrVeteran

Caterham, Surrey, England

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The pitch should not be moving when you apply cyclic. Are you sure it is moving ? I don't have experience with the Hirobo CCPM but I believe it is fairly similar to the JR version,so...

Left/right cyclic should cause two servos to move and tilt the swash.
Fore/aft cyclic should cause all three servos to move - the front in the opposite direction to the rear two.
Pitch should cause all three to move in the same direction.

Any pitch change during cyclic inputs is a no-no. You can check for interaction by positioning the flybar in line with the boom to check left/right and perpendicular to the boom to check fore/aft. Interaction may be caused by the servos being offset at neutral, or possibly swashplate phasing. Check that all your neutrals are centre on the servo horns and adjust with your sub-trim. Check your phasing as detailed in the instructions. Another good one is to ensure that you have the servos plugged into the correct channels as getting this wrong can cuase the swash to move in all sorts of unexpected directions - also check servo direction is correct

Do you fly mode 1 or 2 (ie, is you pitch on the same stick as you aileron or rudder) ? If you have the pitch/aileron combination, then you should make sure you are not unwittingly putting in some pitch when you move the ailerons - it's easily done and you can help stop it by tightening the spring tension on the sticks.

Hope some of this helps... If not I should seek advice from an exeperienced pilot/builder that can actually physically look at the model and radio set-up

Carps.

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07-19-2002 02:47 PM  16 years agoPost 4
AMCross

rrApprentice

champaign IL

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Make sure you are in the proper swash type to match your heli.

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07-19-2002 04:54 PM  16 years agoPost 5
Sceadu

rrApprentice

Corona, CA

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I am pretty sure everything on the controller is correct. Everything seems to work fine. The pitch only moves about a milimeter. I am going to try to dill new holes in servo wheels, maybe I got one a fraction of a mm off.

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07-19-2002 05:32 PM  16 years agoPost 6
Carps

rrVeteran

Caterham, Surrey, England

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Before you start drilling, when you apply left/right cyclic check to see if all three servos are moving. If they are then there is something wrong electronically rather than mechanically. For left/right one servo should remain still throughout the full range of travel.

Carps

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07-19-2002 05:40 PM  16 years agoPost 7
Sceadu

rrApprentice

Corona, CA

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Instead of drilling I just used standard servo arms to test it out. The elevator servo is not moving, just the 2 that push/pull on the side of the swashplate. I see that if I apply cyclic the swash plate and washout move slightly so I am assuming the pitch is changing.I have the swash AFR set to AIL: +70 ELE: -70 Pitch:+50 and swash type SR-3 as the manual states. Hmm...

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07-19-2002 06:18 PM  16 years agoPost 8
Carps

rrVeteran

Caterham, Surrey, England

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Whack a pitch gauge on the blade and measure to confirm there is an actual pitch change. If the third servo is not moving, then the pitch should not be changing. The movement you are seeing may just be the tilt of the swash plate looking a little deceptive.

Carps.

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07-19-2002 06:35 PM  16 years agoPost 9
Sceadu

rrApprentice

Corona, CA

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The blades are moving slightly. The front servo is not moving and I am positive the swash plate is moving up and down about 1mm. I guess i'll have someone look at it.

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