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HomeAircraftHelicopterMain Discussion › Swashplate Not Staying Level
02-11-2006 01:28 PM  12 years agoPost 1
crazzyjoe

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Severn, Ontario, Canada

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I have a Pg Gasser (3 servo's at 120deg)and noticed that my swash plate doe's not stay level. For example at zero pitch it is perfectly level but at +5 pitch the rear/right side of the swash plate is tilted up 1.2mm. From +5 to +10 degrees of pitch it remains the same still out 1.2mm.(at +10 deg pitch it's still out 1.2mm) At zero pitch to -10 degrees of pitch the swash plate remains level.

I can see the swash plate start to tilt at +3 degrees and by +5 degrees it is out buy 1.2mm but then remains constant from there up. What is causing this? I'm using 3 ds8311 servo's on the swash plate and a jr9303 radio. Also at 0 pitch the servo and linkages are 90 deg. Is there something in the radio setup that i can change?

Joe

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02-11-2006 01:55 PM  12 years agoPost 2
Professorwiz

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Livonia, Michigan - USA

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You could have some mixing in your radio, I'd check that first.

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02-11-2006 06:55 PM  12 years agoPost 3
Patriot

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Luton

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I have just had the same problem with my Avant. The servo's were level at top bottom and mid stick, but as you move between top and bottom the swash seemed to wobble through the centre, this was with DS8301's (not new) I think it was worn pots in the centre stick position. I fitted three new servos and all is well with the world.

Just smile

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02-11-2006 08:01 PM  12 years agoPost 4
AlanR8

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Saddleworth near Manchester (UK)

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You could try fiddling with the ATVs to get the swash moving symmetrically.

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02-11-2006 08:09 PM  12 years agoPost 5
JKos

rrProfessor

Redondo Beach, CA

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Yep, use the ATVs to make the swash level at +10 degs and then check it out through the travel again.

- John

RR rules!

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02-11-2006 08:44 PM  12 years agoPost 6
Augusto

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US

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All CCPM systems need to be matched but that doesn't mean you need to get matched servos.

The procedure to match the servos is simply to adjust the ATVs to make them travel the same amount for a certain stick movement.


CCPM Servo Matching process for swashplates with front elevator arms (reverse elevator directions for back elevator arms):
1) Set your pitch curve to a straight line and use the cursor to take it to the middle. At this point your need to make sure all the CCPM levers are horizontal.

2) Adjust all the rods lengths that go to the swashplate to make the swashplate level. Also adjust the blades to have zero pitch at this point.

3) Move the stick up and check that the swashplate is level. If not then adjust the atvs accordingly as follows.

-3.a) If the swashplate moves to the right it means that your right servo (pitch channel) is not traveling as much as the left servo. To match it simply either add ATV percentage to that servo or subtract ATV from the opposite servo (aileron channel).

-3.b) Once the aileron direction is matched look at the elevator direction. If the swashplate goes forward then you need to increase the ATV travel of the front servo (elevator channel). If it tilts back you need to subtract from the ATV of the elevator.

4) Repeat the same 3.a and 3.b steps for the inverted pitch moving the pitch to the full inverted position.

That's how you match the servos on a CCPM system.

Despite doing a visual match in order to make it absolutely perfect you still need to go to the field and do climbouts right-side up and fine tune the atvs for perfectly straight climbs. The same applies for inverted climbouts until you get them perfect.

That's one of the hidden advantages of the CCPM system. It allows you to tune the heli for perfect response individually without mixes.

The reason there is a need to do this is that servo manufacturers as hard as they try can't make all servos travel exactly the same simply because the potentiometer that reads the servo position is never identical to the next. Matching the ATVs will fix that and it will also translate into matched servos for all the other mixes and adjustments that you might want to add.


Augusto.

Avant Aurora Ultimate

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02-11-2006 10:03 PM  12 years agoPost 7
Nasscar][

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Delaware

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Augusto,

Man..... have you ever thought about doing a series of videos on setup, etc.. . . .

hint, hint

Something like Ray's or even beter. . . THE AUGUSTO BIBLE on R/C Helicopters Setup, Design and Theory. .. .

Just promise me that I can have the 24th copy. . . (jeff gordon thing)

Nas,

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02-12-2006 12:50 PM  12 years agoPost 8
crazzyjoe

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Severn, Ontario, Canada

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Thanks Guys,

I will go to my heli now set it up with Augusto methode, after i make sure there is no mixing in the radio.

Joe

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02-12-2006 10:40 PM  12 years agoPost 9
giaffa

rrApprentice

Sao Paulo - BRAZIL

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Augusto,

Man..... have you ever thought about doing a series of videos on setup, etc.. . . .
Couple of years ago he thought about doing videos regarding the "brain training" needed to perform difficult manouvers but, If I remember correct, after a lot of slamming from forum members I think he gave up the idea.

>>> Doing it inverted is better! <<<

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