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Matt Dralle
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Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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 Posted: Fri Jul 17, 2009 7:50 am Post subject: How To Accurately Measure Aileron Throws... |
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Dear Listers,
The construction manual on my RV-8 says to set the aileron throws to 25-32 degrees Up and 15-17 degrees Down. But can't really see how you would accurately measure that? Why doesn't it just list it in inches of throw measured at the trailing edge?
Additionally, 25 to 32 degrees is a pretty big range. What do people recommend?
Thanks!
Matt Dralle
RV-8 #82880 N998RV
Wing To Fuselage Fairings...
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rhdudley1(at)bellsouth.ne
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| Posted: Fri Jul 17, 2009 8:27 am Post subject: How To Accurately Measure Aileron Throws... |
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Hi Matt,
You can use a level like a Smart Level or a mechanical one (like Starrett
"Exact Angle Meter") with angle calibrations. Do the arithmetic between
neutral, full up and full down indications. Apply the same procedure with
the elevator.
Regards,
Richard Dudley
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sarg314(at)gmail.com
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| Posted: Fri Jul 17, 2009 9:39 am Post subject: How To Accurately Measure Aileron Throws... |
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I just went thru this. You measure it relative to the chord line of the air foil. That is pretty well approximated by the tooling holes in the wing end ribs and the aileron end rib. Stretch a string from the forward tooling hole back. The aileron position at which they all line up (as best as you can get it) is the 0 deg. deflection position. I used an electronic level. It does seem like a large angle, but I figure if that's what they specify, that's what I'll make it do.
On Fri, Jul 17, 2009 at 9:25 AM, Richard Dudley <rhdudley1(at)bellsouth.net (rhdudley1(at)bellsouth.net)> wrote:
[quote] --> RV-List message posted by: "Richard Dudley" <rhdudley1(at)bellsouth.net (rhdudley1(at)bellsouth.net)>
Hi Matt,
You can use a  level like a Smart Level or a mechanical one (like Starrett "Exact Angle Meter") with angle calibrations. Do the arithmetic between neutral, full up and full down indications. Apply the same procedure with the elevator.
Regards,
Richard Dudley
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khorton01(at)rogers.com
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| Posted: Fri Jul 17, 2009 10:52 am Post subject: How To Accurately Measure Aileron Throws... |
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On 17 Jul 2009, at 11:48, Matt Dralle wrote:
| Quote: | The construction manual on my RV-8 says to set the aileron throws to
25-32 degrees Up and 15-17 degrees Down. But can't really see how
you would accurately measure that? Why doesn't it just list it in
inches of throw measured at the trailing edge?
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The math to convert the angles to inches travel at the trailing edge
is not difficult. Measure the distance from the pivot to the trailing
edge. The linear travel is:
2 * distance from pivot to trailing edge * sin(travel angle / 2)
But, an electronic level is the way to go. Much easier.
| Quote: | Additionally, 25 to 32 degrees is a pretty big range. What do
people recommend?
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You'll understand why Van offers such a large range when you start
fooling around trying to rig the ailerons. You've got four pushrod
lengths to play with, and given the differential effect of the
bellcranks, if you make one adjustment if affects more than one
thing. I was pulling my hair out before I was finished.
The last few degrees of aileron up travel probably don't make any
difference on roll rate, as the flow starts to separate. All the
extra up aileron does is produce buffet that feeds back to the stick.
So don't waste any effort trying to get more than 25 degrees up.
--
Kevin Horton (Grounded)
RV-8 (Flight Test Phase)
Ottawa, Canada
http://www.kilohotel.com/rv8
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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| Posted: Fri Jul 17, 2009 9:01 pm Post subject: How To Accurately Measure Aileron Throws... |
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At 08:48 AM 7/17/2009 Friday, Matt Dralle wrote:
| Quote: | Dear Listers,
The construction manual on my RV-8 says to set the aileron throws to 25-32 degrees Up and 15-17 degrees Down. But can't really see how you would accurately measure that? Why doesn't it just list it in inches of throw measured at the trailing edge?
Additionally, 25 to 32 degrees is a pretty big range. What do people recommend?
Thanks!
Matt Dralle
RV-8 #82880 N998RV
Wing To Fuselage Fairings...
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Once again, you guys really came though for me! I can't believe I didn't think about using my digital level!! Duh! As you can see from the attached pictures, taping the level right to the aileron and flap works great! The level has a "zeroing" function which worked out perfect so that I didn't have to do any math in my head (ouch). I've attached some pictures for future archive reference.
I haven't made the little aileron control stops yet. I assume that since everything seems to be rigged pretty close to perfect I can just place them such that at my current 32 degrees of Up will hit the stop? Maybe just a hair shy something like 31.5 or something?
Thanks again,
Matt Dralle
RV-8 #82880 N998RV
Wing To Fuselage Fairings...
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jfogarty(at)tds.net
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| Posted: Sat Jul 18, 2009 4:37 am Post subject: How To Accurately Measure Aileron Throws... |
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Mark, Do you have the same travel down on your flaps on both sides, left
and right?
Jim
RV9a Building
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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| Posted: Sat Jul 18, 2009 7:31 am Post subject: How To Accurately Measure Aileron Throws... |
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At 05:34 AM 7/18/2009 Saturday, you wrote:
| Quote: |
Matt,
Do you have the same travel down on your flaps on both sides, left and right?
Jim
RV9a Building
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Yes, 40.7 on the right, and 40.5 degrees max on the left. The chart says "40-45 degrees" so I'm right in there.
Matt Dralle
RV-8 #82880 N998RV
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rickpegser(at)yahoo.com
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| Posted: Sun Jul 19, 2009 5:50 am Post subject: How To Accurately Measure Aileron Throws... |
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the reason it does not list inches is it is referenced to the fuselage center line.
rick
--- On Sat, 7/18/09, Jim Fogarty, Lakes & Leisure Realty, Inc. <jfogarty(at)tds.net> wrote:
[quote] From: Jim Fogarty, Lakes & Leisure Realty, Inc. <jfogarty(at)tds.net>
Subject: Re: Re: How To Accurately Measure Aileron Throws...
To: rv-list(at)matronics.com
Date: Saturday, July 18, 2009, 5:34 AM
"Jim Fogarty, Lakes & Leisure Realty, Inc." <jfogarty(at)tds.net>
Mark, Do you have the same travel down on your flaps
on both sides, left and right?
Jim
RV9a Building
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http://www.matronics.com/Navigator?RV-List |
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