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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Levelling a mechanical swash
04-02-2010 02:06 AM  10 years ago
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rudyy

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E. Amherst, NY

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Levelling a mechanical swash
I use the primitive approach, an allen wrench, to level a 120/135 ccpm swash. Is there any primitive trick for measuring a 90 degree mechanical swash?
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04-02-2010 02:15 AM  10 years ago
rcjon

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Macon, GA

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Allen wrenchAsk your doctor if your heart is healthy enough for Radio Control Helicoptering.
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04-02-2010 02:37 AM  10 years ago
ChrisMoore

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Bay Village, OH

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I really dont want to come across as a smart ass but leveling it by eyeball and then flying it is probably about as primitive as you can get. Even after you level it with a dial indicator or a bubble level you still have to fly it to make sure it actually keeps the heli level.Chris. AMA 497715 IRCHA 3351
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04-02-2010 03:00 AM  10 years ago
jsenicka

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Eagle River, WI

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You really do not have to worry like you do on CCPM.
Get it eyeball close. There is no interaction to worry about.
Jim Senicka
Team Manager, GrandRC Flight Team
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04-02-2010 01:05 PM  10 years ago
Dr.Ben

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Richmond, VA, USA

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There's no interaction, but a poorly leveled swashplate on a mCCPM model will dramatically screw up rolls and create trim disparity between inverted and upright flight. A misleveled swashpate is pretty much a bad thing regardless of the method used to control it.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-02-2010 02:33 PM  10 years ago
BarracudaHockey

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Jacksonville FL

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A level swash is a level swash, no matter whats moving it up and down.

Ben, I probably should have asked last week when I was around Cliff, Dwayne and those guys....

What do you FAI guys that are fanatical about your setup do about translating? Just compensate with the cyclic when you're flying your hovering set or do you trim it out electronicially or mechanically?

I'm guessing you either use trim in each flight mode with a level swash in idle up, or just compensate with cyclic while you're hovering.
Andy
AMA 77227
http://www.jaxrc.com
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04-02-2010 06:42 PM  10 years ago
Dr.Ben

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Richmond, VA, USA

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NADA elevator trim for hover or FFF, dead level swash. You trim the model with CG for hover and use the size of the horizontal fin to trim the model in FFF. If the size of the horizontal fin ends up causing the model to back up in hover, you go back and add a bit more weight to the nose.

A little ail trim for hover and maybe FFF or a PIT>AIL mix is used for FFF. My model has such little roll trim shift in FFF that I don't even notice it. For all intents and purposes and especially now with these eletrics, I could turn every trim lever off in every flight condition except AIL in hover. Pretty cool.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-02-2010 07:35 PM  10 years ago
heliguy

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Boulder, CO

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Hi Ben, Al here

I always appreciate your replies and learn a little bit with each one, but...

I understand your first paragraph, and part of your second.

I need a little right trim in hover to compensate for tail rotor side thrust.

Now is your FF trim then taking out that right trim? Like bringing it back to neutral trim?

Al
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04-03-2010 12:28 AM  10 years ago
Dr.Ben

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Richmond, VA, USA

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Hi Al,

That's right. My models do OK with zero ail trim in the aeros. Going to zero trim is actually going in the needed direction, because the R trim from hover is contraindicated for FFF with a CW rotation rotors. Some guys may use a bit of L trim or mix depending on whether their maneuver schedule requires the model to come to a near standstill in the course of a maneuver (pmix is better in those cases) or not (trim works fine there). Level sure is easy when it's all it takes, though.

Ben
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-03-2010 01:32 AM  10 years ago
heliguy

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Boulder, CO

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Thanks Ben.

My reference to trim in my post was really a pmix pitch to aileron.

Your post just turned on a light bulb in my head. Like I trim a model for hover and then wonder why I get a right roll in in forward flight. Makes sense now and I need to go play with a little pmix.

I have another question for you, although different airframes act differently, what causes some airframes to tend to stop at the bottom of a loop and seem to require an extra amount of forward to get them to transition into forward flight. (or is it just me.)

My T-Rex 600 is the worst on this, it is also the one which has the most apparent right roll in forward flight which I now see how to correct.

I know the Rex 600 is probably not even in you stable, but I think it applies to other machines also.

Al
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04-03-2010 02:43 AM  10 years ago
Dr.Ben

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Richmond, VA, USA

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Al,

Squatting at the bottom of a loop is often caused by a combination of blade and paddle design, model CG, control system slop, and the way that flying technique mixes with those elements. One suggestion for reducing the problem is to get out of the elevator a bit sooner and roll the collective back in smoothly at the same time. If you find you have a lot of collective in the model at the bottom of the loop, that alone can cause the problem, so in that case be a bit more gentle with the pitch.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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