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HomeAircraftHelicopterAerobatic FAI F3C F3N Contest › How to precisely adjust the right level of swash
04-06-2010 01:47 PM  8 years agoPost 21
Synthax

rrApprentice

Warsaw - Poland

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Actually I'm very glad with Ron's tool. I see now what really interactions can be. And did eliminate it.

At some point it becomes your lifestyle

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04-19-2010 04:28 AM  8 years agoPost 22
ESWLFSE

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Liberty Hill, TX

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Ron's tool worked well!

After adding Rocket links and turnbuckles I found I had to screw around a bit with swash height to get the pitch range I wanted. Bolting on blades to check zero was tedious, and I remembered reading somewhere that someone dropped screwdrivers into their blade bolt holes to set zero more quickly.

I had some 3mm carbon tube and some 3mm ID 4mm OD TT sleeves. I glued a few of those in the middle of a couple of lengths of the carbon tubes, and then added a washer so they would easily drop into the blade holders vertically centered. Worked great for checking zero pitch!

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04-28-2010 08:08 PM  8 years agoPost 23
Jim Woodward

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Boca Raton, FL

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http://shop.ebay.com/?_from=R40&_tr...-All-Categories

I happened across this jewel and immediately thought of RR F3C precision forum.
Jim

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04-29-2010 08:27 AM  8 years agoPost 24
Synthax

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Warsaw - Poland

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You are right, it is very nice tool. But for example me, I do not like to remove whole head before each opearation.

At some point it becomes your lifestyle

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04-29-2010 01:58 PM  8 years agoPost 25
Jim Woodward

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Boca Raton, FL

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I think what caught my eye for this device, is that the swash will then be level to the "mast", rather than with a bubble-level horizon type of device.

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05-03-2010 07:19 PM  8 years agoPost 26
u8mydog

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Ottawa, Ont

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I use the leveler from Gforce. It's a bit pricey but works an 450,500 & 600 size machines. It's the style device as Jim mentions but has a center piece that is changed out for different shaft sizes.

Using this type of leveler sure makes it easy to adjust your entpoints to remove the interactions.

..blades../b400/trex500/rap30/knight50

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05-05-2010 09:30 PM  8 years agoPost 27
Synthax

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Warsaw - Poland

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Today I've set my dualrates with Ron's tool as a flybar locker. It does perfect this role with my Freya also.

At some point it becomes your lifestyle

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05-06-2010 08:58 AM  8 years agoPost 28
vfastr6

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Cape Town, RSA

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I've just read this thread (I know its a bit late) and found it very interesting. it got me thinking about something we do naturally on out F3C machines.... It appears to be accurate.

Important to note here is that we use the Vario pitch gauge with the bubble and the helicopter is level as well.

At zero degrees your swash should be level and the paddles should be at zero degrees all around.

With the flybar at 90 degrees to the tailboom if you move the swash up and down to the full extent the paddles should stay at zero degrees. Any deviation would suggest that the swash is not level and travels/mixes etc should be adjusted accordingly for the elevator movement.

The same method is used for the aileron except that the paddles are over the tail boom now.

This has worked well for us.

Cheers

Marc

I'd Rather Be Flying But I Have To Work to Pay For my Crashes!

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05-07-2010 10:25 PM  8 years agoPost 29
synodontis

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United Kingdom

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I could do a very long post about how CCPM is implemented and the like but the significant factors are the following (although it does not necessarily means it's the best way to do it, just a convention that most manufacturers have followed (probably on the advice of the radio manufacturers))

1) all bell cranks same swing size
2) all link rods from bell crank to swash same length (usually but not always, Voyager 50 is an example where the linkage length from crank to swash is different to allow for the servo placement so close to swash)
3) bell crank size not greater than swash size (measured from center of swash to front ball)

the SWM arrangement fits all this nicely. The reason you want (although you don't have to) have all the bell cranks the same size is so you can maintain a level swash through pitch movements at mid stick for aileron and elevator, otherwise you'll have problems allowing for interaction on pitch movement which is a much harder (and nastier) problem to fix. This is a trade off you could say.

you also don't want the bell cranks too small or else you're not going to have much pitch stroke and aileron and elevator swings are also going to be affected.

But then again those of us who have VPUS don't need to trawl through threads going on about how to align things properly since orthogonality of controls taken for granted in the strictest sense.

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05-08-2010 06:33 PM  8 years agoPost 30
synodontis

rrKey Veteran

United Kingdom

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A CCPM Graph
the graph below plots the front bell crank angle against the swash elevator angle on the Sylphide (aileron is zeroed).

for our purposes we are only interested in the range -30 to 30 degrees or so, but the graph clearly shows that it's not linear at all.

I'll do the back cranks later on to compare, and I can change the graph to show having the linkage length wrong as well.

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05-08-2010 10:25 PM  8 years agoPost 31
dicharryrrApprentice - Franklinton, LA - My Posts: All  Forum  Topic

[size=large]Orthogonal projections are useful to determine unknown angles, but why not just measure the angles especially since we have lasers now ?
The following text is from the VIGOR CS manual:

When people fear the government you have tyranny, when the government fears the people ,freedom

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05-08-2010 11:14 PM  8 years agoPost 32
synodontis

rrKey Veteran

United Kingdom

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the best solution
in my mind, and what I would have suggested, is what Hirobo did with the SDX: put locking pins on the cranks. When you first set them up, the locking pins fix the cranks to where they should be at neutral. This means it would be the user's responsibility to get the links to the swash and the servo links right, but the integrity of the cranks at neutral position is guaranteed, serving as a reference point. Hence no need to play around with lasers, levels etc. . .

Now if more manufacturer's caught on with this. . .

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05-09-2010 03:06 AM  8 years agoPost 33
dicharry

rrApprentice

Franklinton, LA

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The SDX swm does sound like a winner:
Hirobo?s SDX .50 is hands down the most tunable and adjustable .50 machine ever developed. It borrows advanced head technology from Hirobo?s Turbulence D3, winner of the 2007 Masters and 2008 XFC Championship. Its versatility will attract beginners learning to hover and excite seasoned 3D pilots. The Turbulence inspired rotor head furnishes outstanding control for the most demanding maneuvers. A precision machined aluminum hub and robust spindle design easily cope with the stresses of aggressive 3D.

An End To Interaction.
All three control bellcranks rotate on a single pivot as opposed to the conventional two or three. In addition, the new swashplate allows about 60% more than standard aileron and elevator throw without binding. This novel engineering virtually eliminates control interaction? you?ll no longer be forced to dilute your concentration correcting spurious control inputs.

Two Mixing Options For Versatility.
Unlike other .50s that deliver only 120º eCCPM mixing geometry, the SDX provides both 120º and 135º options. What?s more, collective loads and elevator/pitch commands are shared by three servos and aileron/roll commands by two. The result: a rock solid control system with unprecedented precision.

Collective ?POP? On Demand:
A generous 30º collective pitch range delivers the ?POP? required for 3D. In addition, cyclic range approaches 9º of deflection for exceptionally quick pitch and roll rates

Features:

Maximum 30º pitch stroke possible for 3D
Stronger, thicker main frame design
New servo mount layouts (as Turbulence) and control layouts
New design tail blade holder with 8mm thrust bearing

When people fear the government you have tyranny, when the government fears the people ,freedom

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HomeAircraftHelicopterAerobatic FAI F3C F3N Contest › How to precisely adjust the right level of swash
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