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Old Sep 14, 2010, 08:48 PM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,212 Posts
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TriCopter Yaw control setups..

Lots of threads around here with lots and lots of posts..

I am currently working on a T tricopter and am pretty sure I've got 95% of my yaw device thought out..

I'm planning on using left over T-Rex 450 parts - since I have quite a few from the occasional oops..

I thought since the threads have gotten so big, it might be nice to have a thread full of yaw ideas..

I'll post up my concept when I get a little further into it..

Right now I'm trying to work how how to mount the "other" side of the blade grip on to the tail boom. Mounting it permanently would be easy. Mounting it so that I could change out the spindle if I should bend it is the part that is slowing me down.

As just a start here are some pretty interesting designs..

A CNC-ed support by Ulix, quite pro-looking
http://www.rcgroups.com/forums/showp...&postcount=237

The Shrediquette, showing that the servo can also be mounted on the moving part of the arm
http://shrediquette.blogspot.com/p/s...uette-dlx.html
http://www.rcgroups.com/forums/showthread.php?t=1089221

The Delta-copter, with an interesting thrust deviation solution (very good "out of the box" thinking)
http://www.rcgroups.com/forums/showthread.php?t=1297596
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Old Sep 15, 2010, 04:20 AM
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anspe's Avatar
Linköping, Sweden
Joined Dec 2002
24 Posts
Here´s how I did it on my first tricopter. It´s a blade holder from a Raptor that sits on an aluminium tube glued into the boom. The aluminium tube has a threaded inside for a screw that holds the blade holder in place. (Did that sentence make sense?)

Best regards,

Anders
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Old Sep 15, 2010, 04:26 AM
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anspe's Avatar
Linköping, Sweden
Joined Dec 2002
24 Posts
And here´s the yaw mechanism I'm building right now. Check the aerial photography forum for my T-copter build.

Anders
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Old Sep 15, 2010, 07:11 AM
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Bisso's Avatar
France
Joined Jun 2007
211 Posts
Nice idea to have all yaw control setups idea in one thread, I had to search amongst numerous threads when looking for inspiration for my design so this thread may be very helpful

Here's a concept plan of the tricopter I'm going to build in the coming weeks



Made from a 250 size tail boom cut in the middle with 8x3x3mm bearings (450 size tail bearing) inside and a threaded axis running through them.

The motor holder is made of horizontal tail fin holders (250 size)
The clamp on the body side is a tail boom holder (250 size)

The servo may be attached to the body by mean of adhesive and a collar, maybe I'll make something more sophisticated if needed

Section view:
Code:
          ____________________________               _____________________________
         |                             |            |                             |
 - Nut - - - Bearing - /// - Bearing - - - Spacer - - - Bearing - /// - Bearing - - - Nut - 
         |_____________________________|            |_____________________________|
Physics simulation:

Google Sketchup - Sketchyphysics - Tricopter Rudder (2) (0 min 44 sec)


I'll let you know how this system is coming along in the next few weeks

EDIT:
Some progress with a slightly modified design



Made from a 450 size spindle shaft with 450 size tail bearings glued by red threadlock on the shaft and the tube instead of being held in place by a nut or collar
It's a bit hard to glue bearings without putting glue into them but that works great if done patiently

The arm is moving totally freely so that's cool, I steel need to add the servo holders and servo, and the ball on the moving part
Now we have this:
Code:
          ____________________________               _____________________________
         |                             |            |                             |
             Bearing - /// - Bearing - - - Spacer - - - Bearing - /// - Bearing
         |_____________________________|            |_____________________________|
EDIT 2:
parts received, here's the result:

Hk250 tricopter - rudder test (0 min 36 sec)


Complete build log: http://www.rcgroups.com/forums/showthread.php?t=1321027
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Last edited by Bisso; Oct 12, 2010 at 01:11 PM.
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Old Sep 15, 2010, 09:38 AM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,212 Posts
Some good ideas here...

I'll take some pics of mine one I get it started, I'm still in the "planning stages."
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Old Sep 15, 2010, 10:03 AM
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Bisso's Avatar
France
Joined Jun 2007
211 Posts
Here are some interesting systems:

A CNC-ed support by Ulix, quite pro-looking
http://www.rcgroups.com/forums/showp...&postcount=237

The Shrediquette, showing that the servo can also be mounted on the moving part of the arm
http://shrediquette.blogspot.com/p/s...uette-dlx.html
http://www.rcgroups.com/forums/showthread.php?t=1089221

The Delta-copter, with an interesting thrust deviation solution (very good "out of the box" thinking)
http://www.rcgroups.com/forums/showthread.php?t=1297596

NB: if the thread tends to get some activity, maybe it would be a good idea to reference posts containing a design in the first message
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Last edited by Bisso; Sep 15, 2010 at 12:41 PM.
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Old Sep 15, 2010, 04:35 PM
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This is mine Two ball bearings and a piece of plastic.
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Old Sep 16, 2010, 10:38 AM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,212 Posts
Quote:
Originally Posted by Bisso View Post

NB: if the thread tends to get some activity, maybe it would be a good idea to reference posts containing a design in the first message
Yeh, I'll definitely do that..

Quote:
Originally Posted by elossam View Post
This is mine Two ball bearings and a piece of plastic.
That's a pretty good idea!
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Old Sep 16, 2010, 11:16 AM
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Joined Jun 2010
24 Posts
Subscribed...Excellent idea!

Perhaps what may be included in the thread are "off-the-shelf" mechanisms and linkages or parts of mechanisms/linkages.

I do not have heli parts laying around or other heli's to cannibalize so I will need to shop for parts.
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Old Sep 16, 2010, 11:43 AM
Tri-Quad-Hexa-Octo-copters!!
United States, TX, San Antonio
Joined Feb 2007
14,279 Posts
Tram,
Nice thread. Let the ideas flow!
Added to the Quadrocopter and Tricopter Mega Link Index
Cheers,
Jim
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Old Sep 16, 2010, 04:21 PM
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Joined Feb 2006
723 Posts
As it seems to be interesting for some I´ve taken some more pics of the way I did it.
The cube is nylon made, a passing hole a bit larger in diameter than the CF tube plus two bearing emplacement on each site to acomodate the bearings and a plastic cap at the end of the tube to prevent the block to fall outside the tube. The engine directly screwed to the nylon cube as wel as the two servo ball linkages on each extreme of the front face finished the system.
The servo and fixed engines are attached to the CF tube using plastic clamps comonly used to secure small tubes and wires to a wall with a screw.
Nothing more.
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Old Sep 17, 2010, 03:01 AM
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X-Ilmar's Avatar
Estonia
Joined Sep 2005
78 Posts
My Yaw 1.0

Hei!

Here is my Yaw versions.
Servo is HD-1810MG
What materjal for pinch blocks, I don't know... 15mm thickness. It is slightly soft...

Second, belt-cp blade holder and feathering shaft.

I have new version with towerpro motormount and belt-cp mainshaft, pictures later...

Best regards,
-Ilmar-
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Old Sep 17, 2010, 08:37 PM
Registered User
United States, IL, Park Ridge
Joined Apr 2010
197 Posts
Hi !
Aluminum body with brass tubing insert as bearing.
Servo Hextronic MG14.
So far no problems.
Tom
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Old Sep 18, 2010, 12:18 PM
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Bisso's Avatar
France
Joined Jun 2007
211 Posts
Something I'd call "quick and dirty" way
from: http://www.rcgroups.com/forums/showthread.php?t=1309716



Good to see you can fly so well with a quite crude (but effective nevertheless) solution
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Old Sep 18, 2010, 07:21 PM
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Paris, France
Joined Jun 2009
756 Posts
another quick and dirty way.
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