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Design => Stunt design => Topic started by: Craig Beck on March 30, 2020, 11:42:54 AM
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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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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
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Thanks for the replies. Does it matter on the rudder and fuselage where it mounts? Probably on the lower outside is my guess.
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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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Two 1/2a nylon horns a Kwik link and some 4-40 threaded rod with one end a Z bend.
Motorman 8)
A 4-40 threaded rod is a bit of overkill when a 2-56 rod will do the job. Just saying.
Keith
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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.
CB
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Great picture. First one I've seen close up. Very simple. I really like it. Thank you
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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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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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This is how I've been doing it. (https://uploads.tapatalk-cdn.com/20200331/359ff988400bc71f75060ed13f7f97b7.jpg)(https://uploads.tapatalk-cdn.com/20200331/c9cfd9a8085d6dada01b56b041f38641.jpg)
Sent from my SM-G973U using Tapatalk
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Wow...I'm impressed.
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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.
Motorman 8)
2-56 hardware is far more than strong enough.
Brett
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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.
Warren Wagner
AMA 1385
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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.
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If simplicity is your goal, use two pieces of 12 gauge copper wire for the hinges. Stays put and doesn't show.
Ken