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Author Topic: Adjustable Rudder  (Read 385 times)

Offline Craig Beck

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Adjustable Rudder
« on: March 30, 2020, 11:42:54 AM »
On a precise stunt plane, is an adjustable rudder that important? I've seen some with and without. What's the best way to make one? Hopefully some pictures will be posted of some too


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Online Brett Buck

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Re: Adjustable Rudder
« Reply #1 on: March 30, 2020, 01:02:19 PM »
On a precise stunt plane, is an adjustable rudder that important? I've seen some with and without. What's the best way to make one? Hopefully some pictures will be posted of some too

   Absolutely critical.

    Brett

Offline Motorman

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Re: Adjustable Rudder
« Reply #2 on: March 30, 2020, 01:33:26 PM »
+1 yes. Every plane I took a guess on needed an adjustment during trimming flights. Kicking myself for not taking the time to make one. Two 1/2a nylon horns a Kwik link and some 4-40 threaded rod with one end a Z bend.

https://www.dubro.com/products/kwik-link-with-rod?_pos=1&_sid=179da59e5&_ss=r&variant=27880505735

https://www.dubro.com/collections/control-horns/products/1-2-a-control-horns

https://www.dubro.com/collections/hinges/products/nylon-hinges


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Offline Craig Beck

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Re: Adjustable Rudder
« Reply #3 on: March 30, 2020, 04:27:31 PM »
Thanks for the replies. Does it matter on the rudder and fuselage where it mounts? Probably on the lower outside is my guess.

Offline Tim Wescott

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Re: Adjustable Rudder
« Reply #4 on: March 30, 2020, 04:35:33 PM »
Craig, it matters that it's firmly mounted and repeatable.  Remember that if you're doing a ground-adjustable rudder (not a Rabe rudder) then it doesn't have to be freely moving -- it just needs to move when you adjust it, and then stay there.
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Online Trostle

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Re: Adjustable Rudder
« Reply #5 on: March 30, 2020, 04:42:14 PM »

Two 1/2a nylon horns a Kwik link and some 4-40 threaded rod with one end a Z bend.

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A 4-40 threaded rod is a bit of overkill when a 2-56 rod will do the job.  Just saying.

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Offline Avaiojet

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Re: Adjustable Rudder
« Reply #6 on: March 30, 2020, 06:33:52 PM »
This isn't a full blown Stunt Ship, be nice though, but here is my adjustable rudder.

I only did this because my lead outs are not adjustable. I'm not even sure if it'll help.

I believe the rod is 2-56 as Keith mentioned. Remove the hatch and I can adjust the elevator.

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Offline Craig Beck

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Re: Adjustable Rudder
« Reply #7 on: March 30, 2020, 07:15:33 PM »
Great picture. First one I've seen close up. Very simple. I really like it. Thank you

Offline Motorman

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Re: Adjustable Rudder
« Reply #8 on: March 31, 2020, 09:55:51 AM »
A 4-40 threaded rod is a bit of overkill when a 2-56 rod will do the job.  Just saying.

Keith

How many grams difference? I like things that don't break. Put it on the outside so you don't have to look at it when you're flying.

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Offline Howard Rush

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Re: Adjustable Rudder
« Reply #9 on: March 31, 2020, 12:16:11 PM »
For a minute there I was having a flashback to my structures days. Sounds like a conversation with the stress man.
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Online Ken Culbertson

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Re: Adjustable Rudder
« Reply #10 on: March 31, 2020, 12:18:56 PM »
The ultimate adjustable comes from Keith Trostle.  This one is on one of my planes.  It is a lot of work but absolutely worth it.

https://stunthanger.com/smf/at-the-handle/rabe-rudder-on-'pusher'-props/msg563674/#msg563674

If this is too high tech use the one pictured below.  I would never build a plane I couldn't adjust the rudder.

Ken
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Offline Chris Fretz

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Re: Adjustable Rudder
« Reply #11 on: March 31, 2020, 04:00:44 PM »
This is how I've been doing it.

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Offline Craig Beck

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Re: Adjustable Rudder
« Reply #12 on: March 31, 2020, 05:57:57 PM »
Wow...I'm impressed.

Online Brett Buck

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Re: Adjustable Rudder
« Reply #13 on: March 31, 2020, 06:08:05 PM »
How many grams difference? I like things that don't break. Put it on the outside so you don't have to look at it when you're flying.

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   2-56 hardware is far more than strong enough.

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Offline Warren Wagner

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Re: Adjustable Rudder
« Reply #14 on: March 31, 2020, 06:20:24 PM »
Craig,

Here is a very simple approach to an "adjustable rudder control" that is
used on a Southwick "Skylark".

By being disassembled in the photo, the required parts are illustrated.
After fabricating the plywood disc, mount and glue it into the recess, and
then sand flush with the fin.

This same system can be used underneath the stab.

These were the parts that I choose, but you can do something similar
with sightly different parts.

And don't waste your best hinges in this application, because they are
just not needed.  These hinges don't even have a pivot wire...they just
flex in the middle of the hinge.  This provides a bit of 'stiffness' in the
hinge which may reduce minor vibration of the rudder.  I don't remember
what brand they are.

Cheers, and stay safe.

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Offline Craig Beck

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Re: Adjustable Rudder
« Reply #15 on: March 31, 2020, 06:59:27 PM »
Warren, what a simple and clean design. I love it too. Thank you everyone for all your comments and suggestions. This has helped me out a bunch.

Online Ken Culbertson

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Re: Adjustable Rudder
« Reply #16 on: April 01, 2020, 06:43:21 AM »
If simplicity is your goal, use two pieces of 12 gauge copper wire for the hinges.  Stays put and doesn't show.

Ken
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