---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Fri 07/17/09: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:50 AM - How To Accurately Measure Aileron Throws... (Matt Dralle) 2. 09:27 AM - Re: How To Accurately Measure Aileron Throws... (Richard Dudley) 3. 10:39 AM - Re: How To Accurately Measure Aileron Throws... (thomas sargent) 4. 11:52 AM - Re: How To Accurately Measure Aileron Throws... (Kevin Horton) 5. 10:02 PM - Re: How To Accurately Measure Aileron Throws... (Matt Dralle) ________________________________ Message 1 _____________________________________ Time: 08:50:46 AM PST US From: Matt Dralle Subject: RV-List: How To Accurately Measure Aileron Throws... 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... ________________________________ Message 2 _____________________________________ Time: 09:27:32 AM PST US From: "Richard Dudley" Subject: Re: RV-List: How To Accurately Measure Aileron Throws... 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 ----- Original Message ----- From: "Matt Dralle" Sent: Friday, July 17, 2009 11:48 AM Subject: RV-List: How To Accurately Measure Aileron Throws... > > 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... > > > ________________________________ Message 3 _____________________________________ Time: 10:39:51 AM PST US Subject: Re: RV-List: How To Accurately Measure Aileron Throws... From: thomas sargent 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 wrote: > > 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 > ----- Original Message ----- From: "Matt Dralle" > To: ; > Sent: Friday, July 17, 2009 11:48 AM > Subject: RV-List: How To Accurately Measure Aileron Throws... > > >> >> 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... >> >> >> >> >> >> > > -- Tom Sargent ________________________________ Message 4 _____________________________________ Time: 11:52:32 AM PST US From: Kevin Horton Subject: Re: RV-List: How To Accurately Measure Aileron Throws... On 17 Jul 2009, at 11:48, Matt Dralle wrote: > 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? > 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. > Additionally, 25 to 32 degrees is a pretty big range. What do > people recommend? 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 ________________________________ Message 5 _____________________________________ Time: 10:02:19 PM PST US From: Matt Dralle Subject: RV-List: Re: How To Accurately Measure Aileron Throws... At 08:48 AM 7/17/2009 Friday, Matt Dralle wrote: >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... 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... ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv-list Browse Digests http://www.matronics.com/digest/rv-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.