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Old Apr 21, 2007, 12:08 AM
henrykk's Avatar
Australia, VIC, Surrey Hills
Joined Jun 2006
297 Posts
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1:3 Std cirrus build

Hi all,

I'm just working out all of the components of fuse/cores build of a 1:3 Std cirrus. (I will add photos as I go)

I am looking for innovative way of making a direct drive rudder from a servo that mounts in the fin. There are no flanges for a pull-pull style setup so the drive must be internal.

Any suggestions/links/images would be welcome

ta
Henryk
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Old Apr 21, 2007, 06:24 AM
I failed linkage geometry
salisbug's Avatar
Melbourne, Australia
Joined Jun 2002
4,239 Posts
G'day Henryk,

I know the sort of arrangement your looking for but cannot find the photos.

It was posted on the group here in the last 6-8 months or so. I know this because I'm fairly new to scale and the concept fascinated me with its simplicity.

The rudder servo is mounted on a small tray the width of the fin. It is mounted to the rudder L/E using small pushrods either side in a pull-pull arrangement.

The tray is located into channels in the fin created by wood strips glued to the internal fin sides so the tray just slides in and is not secured as such to the fin, but the rudder hinge locks the whole unit in place.
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Old Apr 21, 2007, 06:24 AM
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Old Apr 21, 2007, 08:35 AM
henrykk's Avatar
Australia, VIC, Surrey Hills
Joined Jun 2006
297 Posts
Hey G,

is this what you were talking about?

http://www.soaringissa.org/tech_tips...er_install.htm
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Old Apr 21, 2007, 11:42 PM
I failed linkage geometry
salisbug's Avatar
Melbourne, Australia
Joined Jun 2002
4,239 Posts
That's the one. Simple & very clever.
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Old Apr 23, 2007, 09:57 AM
Registered User
Perth, Western Australia.
Joined Apr 2007
8 Posts
Henrykk,
The Standard Cirrus has the rudder side hinged from the starboard side of the fin and the rudder horn is internal. Which model Standard Cirrus are you intending to build?- the early model blunt nose Cirrus - the pointed nose Cirrus 75 or the Cirrus VTC from Yugoslavia.
I own and fly a scale 1:1 Cirrus 75 and I can provide you with scale details if you so desire.
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Old Apr 23, 2007, 03:13 PM
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Lunns's Avatar
Melbourne, Australia
Joined Aug 2003
309 Posts
Henryk,

Attached are photos of how the rudder is setup in my micro swift, the rudder is live hinged to the starboard side and internally the pushrod is internally connected to the inboard port side of the rudder.

Cheers
Steve
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Old Apr 23, 2007, 06:12 PM
henrykk's Avatar
Australia, VIC, Surrey Hills
Joined Jun 2006
297 Posts
Hi Guys - yes the blunt nose early version (built by SH) with the all moving t tail. The rudder is a very interesting detail that I did not know. I had assumed that it was centre hinged - Wedgetail - the images I have of the one in Bachus Marsh looks like it is centre hinged in the photos - I cannot find any documentation to the contrary.

I'd love a set of shots of your glider - if nothing else - to add it to the scale documentation part of my website:
http://www.silentflight.net/
some history of that particular sailplane would be great as well. PM me and I will give you any details you need.

rgs
Henryk
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Old Apr 23, 2007, 07:27 PM
Shhhhh
Roachie's Avatar
Armidale NSW Australia
Joined Jan 2006
614 Posts
I was wondering what the little brass thing was for....I just drilled a smal hole in the rudder and put a zeebend on the control wire.....very neat and no glueing

Did you get a manual with yours?

Quote:
Originally Posted by Lunns
Henryk,

Attached are photos of how the rudder is setup in my micro swift, the rudder is live hinged to the starboard side and internally the pushrod is internally connected to the inboard port side of the rudder.

Cheers
Steve
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Old Feb 09, 2008, 05:53 PM
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Joined Jan 2005
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Dear Henryk

what's going on with your cirrus?

A little bit late but maybe also helpful for others.
For Cirrus details have a look on:
http://www.standardcirrus.org/
For the tail wing
http://www.standardcirrus.org/Elevator.html
For ruder navigate to
http://www.standardcirrus.org/WU-Stabilizer-2.jpg
or to
http://www.standardcirrus.org/Specifications.html
It's true ... the ruder is hinged on the right side.
You can find a detailed picture of the one I have flown about 200h on the following site:
http://www.stierlen1.homepage.t-onli.../CAD/ruder.jpg
The small hole is for the socket wrench which you need to hold the screw if you want to disassamble the linkage.

Please put some pictures of your cirrus on the web.

rgs

Peter
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Old Feb 09, 2008, 09:15 PM
glider guider
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Winnipeg, MB
Joined Mar 2005
73 Posts
Here is another rudder drive thread.
http://www.rcgroups.com/forums/showthread.php?t=771305
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Old Feb 10, 2008, 03:18 AM
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Joined Jan 2008
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Hi Henryk,
I believe the Cirrus you are working on is the one I sold to Col Collyer a few years ago, Bit of a coincedence that, as I have just resently aquired its sister and am about to get stuck in to building the tail surfaces really soon, My plan for the rudder is to mount the rudder servo into the rudder post and as somebody else here mentioned, because it is a side hinged surface just run a short pushrod to the right side of the rudders leading edge.
I'm planning also to put the elevator servo inside the tailplane as far forward as possible and use it as the mass balance, doing it this way will also make it easier to make the fairing that moves with the tailplane more scale.
Good luck with yours I'll post a picture or two of mine as it progress's along the way.
regards,
Alexis
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Old Feb 10, 2008, 03:31 AM
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Old Feb 10, 2008, 04:03 PM
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I believe they are all side hinged, I just remembered that at, standardcirrus.org there is a picture of a rudder with it hinged wide open to show the rudder post etc, I'll try to post alink here later,
regards,
Alexis
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Old Feb 13, 2008, 02:28 PM
henrykk's Avatar
Australia, VIC, Surrey Hills
Joined Jun 2006
297 Posts
Hi Alexis,

Thanks for asking - but I have had some big delays over the past few months with moving house and having to set up new workshops etc. I have just managed to get the lab finished and starting to work on the cirrus again. hope to see some progress over the next few weeks.
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