Today's Message Index:
----------------------
1. 11:17 AM - RV-8 Rudder trim (Jay McIntyre)
2. 11:50 AM - Re: RV-8 Rudder trim (Matt Dralle)
3. 12:33 PM - Re: RV-8 Rudder trim (carl.froehlich@verizon.net)
4. 04:11 PM - Re: RV-8 Rudder trim (Heath Cherneski)
5. 06:00 PM - Re: RV-8 Rudder trim (Robin Marks)
6. 08:01 PM - Re: RV-8 Rudder trim (Dan Bergeron)
Message 1
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Subject: | RV-8 Rudder trim |
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
Message 2
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Subject: | Re: RV-8 Rudder trim |
At 11:14 AM 12/13/2011 Tuesday, you wrote:
>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
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
Message 3
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Subject: | Re: RV-8 Rudder trim |
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Message 4
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Subject: | Re: RV-8 Rudder trim |
The rv series has excellent directional stability and appropriate rudder for
ces even at high speed. With these qualities, rudder trim, even a spring bi
as system is added weight with not much benefit. My 8 flew half a ball out a
t cruise power. I fabricated a trim tab that is right now "200 mph" taped t
o 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 b
arely noticeable. I have a two axis auto pilot that I routinely use for cli
mb out and descent completely hands free. These airplanes have amazing flyi
ng qualities and that, I believe, is due in part to a commitment to avoid co
mplex solutions when a simple one will do. All that to say that pedal input
s required to maintain balanced flight even while maneuvering are minimal an
d the addition of even a simple adjustable rudder trim system is added weigh
t, 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@gmail.com> wrote:
> Hi all...
> I am looking after an RV-8 for a customer. He is in the process of buying t
he Trio auto pilot gear and was wondering if there is anything out that RV b
uilders have used for rudder trim as opposed to a fixed ground adjustable ta
b 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 p
edals all the time..."
>
> Regards, Jay
> New Zealand
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
Message 5
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Subject: | Re: RV-8 Rudder trim |
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 mandato
ry on the RV-10. because it was relatively easy to do we added a much impro
ved version to my 8A after the rudder was built. Like others have stated th
e 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 altoget
her. Same with the trim location indicator. We eliminated that since the ba
ll is your trim indicator. If you send me a reminder this weekend I will po
st 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 tr
im. :-)
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@gmail.com<m
ailto:heath.cherneski@gmail.com>> wrote:
The rv series has excellent directional stability and appropriate rudder fo
rces 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 o
ut at cruise power. I fabricated a trim tab that is right now "200 mph" ta
ped to the rudder and provides perfectly balanced flight at cruise power se
ttings. Weight, several ounces. Very simple. Took one adjustment and test
flight. The pedal you have to add during climb out and descent is very sm
all and barely noticeable. I have a two axis auto pilot that I routinely u
se for climb out and descent completely hands free. These airplanes have a
mazing 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 tha
t 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 opini
on.
Heath
N818HC
Sent from my iPad
On Dec 13, 2011, at 2:14 PM, Jay McIntyre <<mailto:cjaviator@gmail.com>cjav
iator@gmail.com<mailto:cjaviator@gmail.com>> wrote:
Hi all...
I am looking after an RV-8 for a customer. He is in the process of buying t
he 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 pe
dals all the time..."
Regards, Jay
New Zealand
=========
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><http://www.buildersbooks.com>www.buildersbooks.com<http://www.buildersboo
ks.com>
"http://www.homebuilthelp.com">www.homebuilthelp.com
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n
=========
ef="http://www.matronics.com/Navigator?RV8-List">http://www.matronics.com
/Navigator?RV8-List
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Message 6
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Subject: | Re: RV-8 Rudder trim |
Jay:
Avery Tools sells a great little device called a "rudder trim tab," part #
9883, sells for $13.50 US in the 2009 catalogue - bond it to the
appropriate side of the trailing edge of the rudder - I'll bet your trim
problem goes away - I drove myself nearly crazy trying to eliminate a heavy
left wing on my RV-7A - someone told me about Avery's "rudder trim tab" - I
bonded it to the underside, outboard, trailing edge of the right aileron -
problem solved - after 280 hours of flight time it's still there and still
working - and no one has ever noticed it - most of my flying is x/c and,
other than landings, takeoffs and the occasional slow speed and stall
practice - I never touch the rudder pedals - elevator trim is another story
however - I installed electric elevator trim during construction - works
great and well worth it - also have electric aileron trim - which I've used
only rarely - when I have a fuel imbalance in the tip tanks -
Dan Bergeron
RV-7A - N307TB
280 hours since first flight
on 8/6/11
On Tue, Dec 13, 2011 at 8:57 PM, Robin Marks <robin@painttheweb.com> wrote:
> 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@gmail.com>
> wrote:
>
> 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@gmail.com>
> cjaviator@gmail.com> wrote:
>
> 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
>
> *
>
> =========
> http://www.aeroelectric.com">www.aeroelectric.com
> > <http://www.buildersbooks.com>www.buildersbooks.com
> "http://www.homebuilthelp.com">www.homebuilthelp.comhttp://www.matronics.com/contribution">http://www.matronics.com/contribution
>
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> =========
> *
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>
> 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/contributionhttp://www.matronics.com/Navigator?RV8-List
> //forums.matronics.com">http://forums.matronics.com
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