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ad4hk2004(at)yahoo.com
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 Posted: Mon Jun 22, 2009 3:55 am Post subject: RV7-List Digest: 1 Msgs - 06/21/09 |
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Several quick-n-dirty methods pop to mind...
I bought a gravity protractor/level (from Sears, I think) for a few bucks and 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 rudder of course) This will work upright or flat... Lacking a protractor lay the stick on graph paper and calculate the angle by drawing a triangle and doing the math...
Or, stand the stab/rudder upright, use your ruler to measure the the deflection 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 rudder...
Then of course, my mind kicks into gear and I start envisioning using a laser 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 the rudder centered and deflected......
Or how about a potentiometer slaved to the hinge line of the rudder - Wheatstone Bridge - and measuring the change in resistance as the rudder deflects...
Or a Wein Bridge oscillator with the potentiometer changing the frequency of the oscillator as the rudder swings... With a bit of practice on the rudder pedals you could even play music...
Ah well, the cute little nurse tells me it is time for my pills and a nap while wearing my special jacket...
denny / k8do
[quote][b]
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frazitl
Joined: 04 Feb 2008
Posts: 9
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| Posted: Mon Jun 22, 2009 6:09 pm Post subject: RV7-List Digest: 1 Msgs - 06/21/09 |
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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(at)yahoo.com>
Subject: 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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Terry Frazier
RV7A
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