Today's Message Index:
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1. 04:26 AM - Re: Measure RUDDER Deflection (Swing) Angle (Greg Vouga)
2. 04:55 AM - Re: RV7-List Digest: 1 Msgs - 06/21/09 (Dennis OConnor)
3. 01:13 PM - Re: Measure RUDDER Deflection (Swing) Angle (Steve Hutt)
4. 07:09 PM - Re: RV7-List Digest: 1 Msgs - 06/21/09 (Terry Frazier)
Message 1
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| Subject: | Measure RUDDER Deflection (Swing) Angle |
I used a protractor and straight edge to mark the angle on a piece of cardb
oard. Then I cut the carboard so I had a large piece with the correct angl
e that I could hold up to the rudder and VS when it was mounted on the plan
e. Dirt simple=2C but it worked.
Greg
RV-7A
Raleigh=2C NC (5W5)
From: gareywittich2000@yahoo.com
Subject: RV7-List: Measure RUDDER Deflection (Swing) Angle
Greetings:
Have my VS mounted to the work bench along with the Rudder attached. Tryin
g to verify the 35 degree travel on the Rudder to the Left and Right of Neu
tral. Seen no Archieves on how to measure the angle other than laying the
VS and Rudder on the work bench and using "Smart Level" to measure the defl
ection in the Up & Down positions. Must be "super simple" to measure it=2C
but for some reason the method is not evident to me (now).
Appreciate your help=2C Garey Wittich Santa Monica=2C CA
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Message 2
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| Subject: | Re: RV7-List Digest: 1 Msgs - 06/21/09 |
Several quick-n-dirty methods pop to mind...
I bought a gravity protractor/level (from Sears, I think) for a few bucks a
nd used the lay it down method...
Another would be to take a small stick, cut in two pieces, drill a hole at
one end of each piece and put a bolt thru it, making a hinged stick... use
that hinge to fit it into the valley of the deflected rudder and then use a
protractor to measure the included angle (allowing for the taper of the ru
dder of course)- This will work upright or flat...- Lacking a protracto
r lay the stick on graph paper and calculate the angle by drawing a triangl
e and doing the math...
Or, stand the stab/rudder upright, use your ruler to measure the the deflec
tion from centerline and use that number to lay out a triangle on paper and
calculate the angle...- Remember to measure the baseline of the triangle
from the center of the hinge bolts, not from the leading edge of the rudde
r...
Then of course, my mind kicks into gear and I start envisioning using a las
er range finder and little mirrors stuck to the rudder and to the walls to
measure the change in distance from the tip of the rudder to the wall for t
he rudder centered and deflected......
Or how about a potentiometer slaved to the hinge line of the rudder - Wheat
stone Bridge - and measuring the change in resistance as the rudder deflect
s...
Or a Wein Bridge oscillator with the potentiometer changing the frequency o
f the oscillator as the rudder swings...- With a bit of practice on the r
udder pedals you could even play music...
Ah well, the cute little nurse tells me it is time for my pills and a nap w
hile wearing my special jacket...
denny / k8do
=0A=0A=0A
Message 3
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| Subject: | Re: Measure RUDDER Deflection (Swing) Angle |
Garey,
The simple thing to do is to do your sums to find the required angle (with
the rudder at max deflection) between the VS skin and the rudder skin.
Then make up a template out of heavy cardboard shaped to this angle. Hold
the template against the VS/rudder and check the deflection matches.
You need to do this with the VS/rudder mounted on the fuselage as you need
to check that the rudder stops are in the correct position and that
the rudder pedals/cables setup does not introduce any restriction to the
range of movement.
Once you're sure the cardboard template is correct, make a copy out of
something tougher like plywood that will last.
You'll need to check the rudder range of movement as part of your ongoing
maintenance routine.
Regards,
Steve Hutt
RV-7
UK
Message 4
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| Subject: | RE: RV7-List Digest: 1 Msgs - 06/21/09 |
You really should just wait until you mount the tail on the fuselage to
measure and set the max deflection angles. They are limited by small rudder
stops attached to the lower fuselage. My advice is to make them oversized
for the first try and then file a little off at a time to get the proper max
deflection. I made several sets until I got it right, and then I still had
the potential for interference between the rudder cables and the rudder
stops. I missed a dimension on the plans. I'm going to install an
"internal rudder stop" sold by a reader on Van's Airforce. You might look
at this neat mod before you spent too much time building the stops per the
plans...
Terry
Time: 08:53:49 PM PST US
From: Garey Wittich <gareywittich2000@yahoo.com>
Subject: RV7-List: Measure RUDDER Deflection (Swing) Angle
Greetings:
Have my VS mounted to the work bench along with the Rudder attached. -Try
ing to verify the 35 degree travel on the Rudder to the Left and Right of N
eutral. -Seen no Archieves on how to measure the angle other than laying
the VS and Rudder on the work bench and using "Smart Level" to measure the
deflection in the Up & Down positions. -Must be "super simple" to measure
it, but for some reason the method is not evident to me (now).
Appreciate your help, - -Garey Wittich - Santa Monica, CA
=0A=0A=0A
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