---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Tue 12/26/06: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:49 AM - together again (Oscar Zuniga) 2. 10:01 AM - Re: together again (Isablcorky@aol.com) 3. 10:20 AM - aileron droop okay (Cuy, Michael D. (GRC-RXD0)[ASRC]) 4. 11:11 AM - Re: together again (Rcaprd@aol.com) 5. 04:48 PM - Elevators (Steve Singleton) 6. 06:42 PM - Re: Elevators (Don Emch) 7. 07:55 PM - Re: Re: Elevators (Steve Singleton) ________________________________ Message 1 _____________________________________ Time: 09:49:49 AM PST US From: "Oscar Zuniga" Subject: Pietenpol-List: together again Had a pretty nice Christmas day, assembling wings back onto the fuselage of 41CC. Dusted off all the parts and pieces and it went together fairly smoothly. Struts and brace cables, wing gap covers, nuts and bolts, everything but inspection covers (waiting for A&P to do the annual). Interesting to see how it rigged out without adjusting anything or moving anything. The wing has about 3" of dihedral and about 2 degrees of washout. I believe that the dihedral is exactly per Corky's original rigging, but not sure about the washout. I'll keep it as-is for test flights and see how it flies. We checked dihedral by stretching a cord from wingtip to wingtip right at the front spar, then measuring the dihedral at the wing center section. We checked washout using a 3/4" plywood template that I cut out, leaving the top edge square and the bottom following the curve of the wing top surface from nose (leading edge) to about the aft spar station. We put this template on top of the ribs at root and out near the tip, with a digital level on top of the template, to determine angles at root and tip, obtaining washout by difference. Pretty accurate. With the stick centered, the ailerons (piano hinged) rig out with their trailing edges just a tad below the TE of the wing on both sides. My test pilot Charlie says he remembers it flying this way originally; I'll have to look through the in-flight photos to see if that's so. I can take out the droop and bring the TEs of the ailerons into perfect trail with the wing TE if need be, but I wanted to put it all back together the way it originally was before tweaking anything. Wing gap covers went back on with all holes lining up perfectly, so that's a good sign. Winds were gusting over 35 kts at Zapata County Airport yesterday as a strong cold front blew through, so no taxi testing yet! Sure was good to see the airplane looking like an airplane again. Oscar Zuniga San Antonio, TX mailto: taildrags@hotmail.com website at http://www.flysquirrel.net _________________________________________________________________ Your Hotmail address already works to sign into Windows Live Messenger! Get it now ________________________________ Message 2 _____________________________________ Time: 10:01:32 AM PST US From: Isablcorky@aol.com Subject: Re: Pietenpol-List: together again The aileron drop, relative to the rest of the wing is correct. I based this rigging on the L-16 from Liaison Piot School ( Aeronca ). Don't make them even. The elevators will drop slightly also in level flight. Note the air to air pics I have posted. Happy and Safe flying Corky ________________________________ Message 3 _____________________________________ Time: 10:20:24 AM PST US Subject: Pietenpol-List: aileron droop okay From: "Cuy, Michael D. (GRC-RXD0)[ASRC]" Oscar-- my IA and friend 78 year old Don Helmick said they used to rig the ailerons on planes like DC-3's, Aeronca's, and Cubs with a little droop in each aileron so that in flight the aero forces would make them align nicely with the trailing edge. I think mine droop about 3/16" to 1/4" on the ground and in flight, nice and true w/ the wing trailing edge. Mike C. ________________________________ Message 4 _____________________________________ Time: 11:11:40 AM PST US From: Rcaprd@aol.com Subject: Re: Pietenpol-List: together again Oscar, 41CC got a great Christmas present when you got all her parts back on !! I keep my ailerons rigged even with the trailing edge, and there is no difference in flight. Washout is not really necessary in a Hershey Bar Wing, because this planform inherently begins to stall inboard, and progresses to the outboard. However, it would be best to err toward washout. On a perfectly straight wing, rigging the trailing edge of the ailerons UP will (by reducing the angle of attack) cause washout. The drooped trailing edge of the flippers seems to be a Pietenpol characteristic. Chuck G. ________________________________ Message 5 _____________________________________ Time: 04:48:28 PM PST US From: "Steve Singleton" Subject: Pietenpol-List: Elevators Hi everyone-hope everyone had a safe and Merry Christmas. I'm fitting togeather the elevators and am curious to know if I should start the taper on the end pieces from the main beam to the trailing edge from the main beam or should I start the taper at or just behind the center beam. Thanks. Steve Singleton ________________________________ Message 6 _____________________________________ Time: 06:42:10 PM PST US Subject: Pietenpol-List: Re: Elevators From: "Don Emch" I think I kept mine the same thickness until the last few inches and then tried to taper it down to nicely match the trailing edge piece. It probably doesn't matter much, but I guess I tried to err on the side of holding that thickness for rigidity. The elevators and rudders are fairly flexible when they are complete. In flight, however I'm sure there isn't much flexing. Don Emch NX899DE P.S. Definitely the time of year that I miss building! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=83681#83681 ________________________________ Message 7 _____________________________________ Time: 07:55:15 PM PST US From: "Steve Singleton" Subject: Re: Pietenpol-List: Re: Elevators Thanks Don. I fitted one together tapering from the center beam but like the idea of holding the thickness until farther back. Another question-is there any structural difference between Birch plywood and mahogany. I had in mind to use mahogany but may go with birch if there is a big price difference. I know this must be an age old question but is there any where else other than Wicks or spruce to buy plywood? Thanks. Steve Singleton ----- Original Message ----- From: "Don Emch" Sent: Tuesday, December 26, 2006 8:41 PM Subject: Pietenpol-List: Re: Elevators > > I think I kept mine the same thickness until the last few inches and then > tried to taper it down to nicely match the trailing edge piece. It > probably doesn't matter much, but I guess I tried to err on the side of > holding that thickness for rigidity. The elevators and rudders are fairly > flexible when they are complete. In flight, however I'm sure there isn't > much flexing. > Don Emch > NX899DE > P.S. Definitely the time of year that I miss building! > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=83681#83681 > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message pietenpol-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Pietenpol-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/pietenpol-list Browse Digests http://www.matronics.com/digest/pietenpol-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.