Front mounted rudder question.  
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Front mounted rudder question. - 2/19/2008 3:11:59 AM   
John Baligrodzki



Posts: 129
Joined: 4/16/2003
From: North St.Paul, MN, USA
Status: offline 		While getting my very old Not For Sale ready for another season of flying I decided to make some changes to it. I have designed and built a rudder that is mounted to the top for the fuse right behind the engine. A simple mod that should dramaticaly improve knife edge performance.

My question is: When I give it left rudder should both the rear and front rudders go to the left? Or does the front rudder need to go the opposite way? I know if you have a canard the elevator is set up backwards of a normal elevator.

Thanks, for your help!

Regards,

John B.
       Post #: 1

RE: Front mounted rudder question. - 3/27/2008 5:36:24 AM   
gyrocptr


 

Posts: 36
Joined: 7/9/2006
From: Neenah, WI, USA
Status: offline 		If the idea is to keep the nose "up" during knife-edge flight, I think you would want the front-rudder to move "opposite" the rear-rudder.
I wonder if you will get some undesired "roll" coupling when that front rudder moves?

(in reply to John Baligrodzki)
       Post #: 2

RE: Front mounted rudder question. - 3/27/2008 3:41:30 PM   
daveopam



Posts: 4351
Joined: 10/10/2002
From: ELK CITY, OK, USA
Status: offline 		opposite for sure. The CG is the pivot point.

David

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(in reply to gyrocptr)
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RE: Front mounted rudder question. - 3/27/2008 4:45:19 PM   
buildflycrash



Posts: 706
Joined: 9/15/2003
From: Gulf Breeze , FL, USA
Status: offline 		I gotta see this. Keep us posted.

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       Post #: 4

RE: Front mounted rudder question. - 3/28/2008 2:23:16 PM   
MIXMASTER



Posts: 1374
Joined: 3/29/2004
From: williamstown, NJ, USA
Status: offline 		I did this to a Sig faser, it did work some, but does create some "weird" handling characteristics. Its not a substitute for a great flying plane, its a bandaid fix for poor KE performace. A well designed plane will KE all day long with little coupling, even slow HA KE. 2 good examples: Fusion & Double Vision. The Double Vision will hold KE without any rudder, it flys on its side like almost like when its upright. The 67" Fusion loves to fly on its fuse, it will not roll out even when in HA KE hover, going slow & full rudder.

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(in reply to buildflycrash)
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RE: Front mounted rudder question. - 3/28/2008 3:00:52 PM   
buildflycrash



Posts: 706
Joined: 9/15/2003
From: Gulf Breeze , FL, USA
Status: offline
quote:

ORIGINAL: MIXMASTER

The Double Vision will hold KE without any rudder


I kind of doubt that. Little rudder, sure. No rudder= cartwheel.


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       Post #: 6

RE: Front mounted rudder question. - 4/1/2008 5:08:27 AM   
eurof2


 

Posts: 44
Joined: 8/17/2006
From: Scappoose, OR, USA
Status: offline 		Lanier made a plane called the Double Trouble that was designed basically like you are describing. There were two rudders on it. The one on the front was both above and below the fuse though. It looked like you were talking about putting it on the top only. That might make for some interesting characteristics when rudder is applied.

The rudders on the Double trouble act opposite of each other.

(in reply to buildflycrash)
       Post #: 7

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