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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Swash Plate Not Staying Level
02-11-2006 01:42 PM  12 years agoPost 1
crazzyjoe

rrVeteran

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 02:21 PM  12 years agoPost 2
SteveH

rrProfessor

Texas

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Joe,

I would go back and double check with a 90 degree angle as a sighting guide to make shure all the bell cranks are actually at 90 degrees...especially the elevator bell crank, as it is the hardest to see. ANY error at 0 degees in the accuracy of the bell crank setup will show up exactly like what you are seeing.

I get the 0 degree set up right, and then fly it and set the end points as necessary to get the heli to fly straight with full stick in each position, full up and full down. I'm shure others have different methods, but that's what works for me.

The government cannot give you anything without first taking it from someone else.

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02-11-2006 06:52 PM  12 years agoPost 3
crazzyjoe

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Severn, Ontario, Canada

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Thanks for the info Steve, I will double check everything again.

Joe

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02-12-2006 03:15 PM  12 years agoPost 4
jackheli

rrProfessor

Vancouver - Canada

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Sometimes the eCCPM servos are not exactly matched, what causes the swash to tilt as it is raised and lowered.

In order to make it rise and fall levelled you need to firstly make sure the swashplate is levelled at 0 degrees and that every rod is at 90 degrees with all arms.

After that is done you need to raise and lower the swashplate to the max extent of travel for the range of collective you are using and observe to which side (or sides) the swashplate tilts. You then apply ATV to that side in order to get it levelled again. In general you should not require more than +/-5% ATV on a single channel to one side. For example, if the swash tilts left, apply + or - 1~5% ATV as needed to the left or right servo at the extreme that affects the swashplate. The same for elevator...

This tool is very helpful to take the guesswork out of the procedure:
Swashplate Levelling Tool

Also take a look at these shots in my gallery. The whole procedure is described there:

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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