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cjaviator(at)gmail.com
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 Posted: Tue Dec 13, 2011 11:17 am Post subject: RV-8 Rudder trim |
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Hi all...
I am looking after an RV-8 for a customer. He is in the process of buying the Trio auto pilot gear and was wondering if there is anything out that RV builders have used for rudder trim as opposed to a fixed ground adjustable tab or adjustable spring bias on the rudder pedal.
i.e. something in the way of a servo....
In his own words... "as a 747 pilot I am too lazy to keep my feet on the pedals all the time..."
Regards, Jay
New Zealand
[quote][b]
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25203
Location: Livermore CA USA
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| Posted: Tue Dec 13, 2011 11:50 am Post subject: RV-8 Rudder trim |
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At 11:14 AM 12/13/2011 Tuesday, you wrote:
| Quote: | Hi all...
I am looking after an RV-8 for a customer. He is in the process of buying the Trio auto pilot gear and was wondering if there is anything out that RV builders have used for rudder trim as opposed to a fixed ground adjustable tab or adjustable spring bias on the rudder pedal.
i.e. something in the way of a servo....
In his own words... "as a 747 pilot I am too lazy to keep my feet on the pedals all the time..."
Regards, Jay
New Zealand
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I flew my IO-390 210hp CS RV-8 for 170 hours last year. Rudder trim is definitely *not* necessary. At 3000+fpm climb rate, the amount of time you're running at full power is so short by the time you diddled with the rudder trim, you'd have missed your target altitude. Lots of elevator trim *is* needed however, particularly solo.
Matt's $.02
-
Matt "Red Dawg" Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 26+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
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Matt Dralle
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carl.froehlich(at)verizon
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| Posted: Tue Dec 13, 2011 12:33 pm Post subject: RV-8 Rudder trim |
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Fully agree. It took me a full year to stop putting in too much rudder. Other than takeoff, landing, slow flight and aerobatics, the rudder gets little use.
Carl
Sent from my phone. Please read pass the typos.
-----Original message-----
[quote]From: Matt Dralle <dralle(at)matronics.com>
To: rv8-list(at)matronics.com
Sent: Tue, Dec 13, 2011 19:43:51 GMT+00:00
Subject: Re: RV8-List: RV-8 Rudder trim
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HeathCherneski
Joined: 08 Mar 2007
Posts: 10
Location: Enterprise, AL
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| Posted: Tue Dec 13, 2011 4:11 pm Post subject: RV-8 Rudder trim |
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The rv series has excellent directional stability and appropriate rudder forces even at high speed. With these qualities, rudder trim, even a spring bias system is added weight with not much benefit. My 8 flew half a ball out at cruise power. I fabricated a trim tab that is right now "200 mph" taped to the rudder and provides perfectly balanced flight at cruise power settings. Weight, several ounces. Very simple. Took one adjustment and test flight. The pedal you have to add during climb out and descent is very small and barely noticeable. I have a two axis auto pilot that I routinely use for climb out and descent completely hands free. These airplanes have amazing flying qualities and that, I believe, is due in part to a commitment to avoid complex solutions when a simple one will do. All that to say that pedal inputs required to maintain balanced flight even while maneuvering are minimal and the addition of even a simple adjustable rudder trim system is added weight, complexity and expense that is largely wasted in my opinion.
Heath
N818HC
Sent from my iPad
On Dec 13, 2011, at 2:14 PM, Jay McIntyre <cjaviator(at)gmail.com (cjaviator(at)gmail.com)> wrote:
[quote]Hi all...
I am looking after an RV-8 for a customer. He is in the process of buying the Trio auto pilot gear and was wondering if there is anything out that RV builders have used for rudder trim as opposed to a fixed ground adjustable tab or adjustable spring bias on the rudder pedal.
i.e. something in the way of a servo....
In his own words... "as a 747 pilot I am too lazy to keep my feet on the pedals all the time..."
Regards, Jay
New Zealand
[b]
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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robin(at)PaintTheWeb.com
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| Posted: Tue Dec 13, 2011 6:00 pm Post subject: RV-8 Rudder trim |
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Jay,
I have had 4 RV's and have come to really my electric rudder trim. My first two had a bendable tab and the last two we installed an electric trim tab built into the rudder. I think some form of electric rudder trim is mandatory on the RV-10. because it was relatively easy to do we added a much improved version to my 8A after the rudder was built. Like others have stated the 8 does not fly that much out of trim but I prefer my cross country flying to be completely coordinated.
Below is a link to the trim we placed in the -10. We improved the design of the 8A substantially by eliminating the external arm and mechanism altogether. Same with the trim location indicator. We eliminated that since the ball is your trim indicator. If you send me a reminder this weekend I will post images of the 8A rudder trim when I am back home. I am currently flying the -10 east to west coast across the US and I am really glad I have the trim. 
Robin
http://painttheweb.com/painttheweb/rv%2D10/RudderTrim.aspx
Sent from my iPad2.
On Dec 13, 2011, at 6:17 PM, "Heath Cherneski" <heath.cherneski(at)gmail.com (heath.cherneski(at)gmail.com)> wrote:
[quote] The rv series has excellent directional stability and appropriate rudder forces even at high speed. With these qualities, rudder trim, even a spring bias system is added weight with not much benefit. My 8 flew half a ball out at cruise power. I fabricated a trim tab that is right now "200 mph" taped to the rudder and provides perfectly balanced flight at cruise power settings. Weight, several ounces. Very simple. Took one adjustment and test flight. The pedal you have to add during climb out and descent is very small and barely noticeable. I have a two axis auto pilot that I routinely use for climb out and descent completely hands free. These airplanes have amazing flying qualities and that, I believe, is due in part to a commitment to avoid complex solutions when a simple one will do. All that to say that pedal inputs required to maintain balanced flight even while maneuvering are minimal and the addition of even a simple adjustable rudder trim system is added weight, complexity and expense that is largely wasted in my opinion.
Heath
N818HC
Sent from my iPad
On Dec 13, 2011, at 2:14 PM, Jay McIntyre < (cjaviator(at)gmail.com)cjaviator(at)gmail.com (cjaviator(at)gmail.com)> wrote:
| Quote: | Hi all...
I am looking after an RV-8 for a customer. He is in the process of buying the Trio auto pilot gear and was wondering if there is anything out that RV builders have used for rudder trim as opposed to a fixed ground adjustable tab or adjustable spring bias on the rudder pedal.
i.e. something in the way of a servo....
In his own words... "as a 747 pilot I am too lazy to keep my feet on the pedals all the time..."
Regards, Jay
New Zealand
f="http://www.aeroelectric.com">www.aeroelectric.com
">www.buildersbooks.com
ref="http://www.homebuilthelp.com">www.homebuilthelp.com
f="http://www.matronics.com/contribution">http://www.matronics.com/contribution
http://www.matronics.com/Navigator?RV8-List
//forums.matronics.com">http://forums.matronics.com
f="http://www.matronics.com/contribution">http://www.matronics.com/contribution
|
[b]
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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