Brodhead Pietenpol Association

Original Posted By: Ned Lebens
I am currently attaching my fuselage sides. I have checked and rechecked my dimensions. As the pictures show, I have an irregular bow inward at the 2nd station from the back.I am using the long fuselage plans.The dimensions I am using measured from the tail are1st strut 19.125" from the end of the tail 7 " across2nd strut 41.5" from the end of the tail 11" across3rd strut 68.375" from the end of the tail 17" across4th strut 95.5`` from the end of the tail 22`` acrossPlan dimensions for the sides are 19.375-------19.375 total 22.500-------41.875 total 27.000-------68.875 total 27.250-------96.125 totalI recognize that there are slight differences between my dimensions and the fuselage side dimensions. I believe that some of this is due to the curve at the tail effectively reducing the length when the sides.I just need to know if someone can identify my error.I don`t want to arbitrarily change plan dimensions but I do not believe this bow is intended to be there.Any ideas or suggestions would be greatly appreciated,Norm________________________________III________________________________________________________________________________

Original Posted By: Hans van der Voort
Subject: Re: Pietenpol-List: Fw: planeHi Norm,I used the plans width dimensions from the firewall to the pilot's seatback. Aft of there, I do recall some discrepancies between the plans andthe natural bow my fuse wanted to take, as I pulled the tail together.Here is what I've measured on my fuse:Distance forward from tail post and width taken at outside edges oflongerons:19-3/8" 5-5/8"41-7/8" 11-1/8"68-7/8" 17-5/16"94-1/8" 21-3/4"Note that I have angled the top of the pilot's seat back 2" beyond theplans, so this probably had some small effect on the aft stations. Isuggest fixing the 68-7/8" station width where you want it and then pullthe tail together. Cut the rest to fit.Regards,Ned________________________________________________________________________________Date: Mon, 2 Jan 2017 21:15:00 +0000 (UTC)

Original Posted By: normdecou(at)aol.com

Original Posted By: helspersew(at)aol.com

Original Posted By: normdecou(at)aol.com
Norm, From your fourth photo it appears that you have not begun to thin down the tailpost. Before you glue anything up and have a curve you might want to cut thetil post and make sure everything fits properly prior to actually gluing andclampIng. Just saying--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Mon, 2 Jan 2017 22:39:29 -0500

Original Posted By: "aviken"
Subject: Re: Pietenpol-List: Fw: planeNorman, as tkreiner said, your tail post looks too wide. The tail postneeds to be 1 inch wide, outside to outside. The way I did it was to putin cross pieces back to station 3 (from the front (keeping every thingsquare). Then I pulled the two tail posts together and sawed down thecenter until the tail post was 1-inch wide. Then I just measured at eachstation and cut the cross pieces as wide as they need to be. I didn't payany attention to the dimensions of the cross pieces given on the plansbecause the dimensions given are for the short fuselage. (My plans don'thave a top view (giving dimensions) of the fuselage frame. I don't believethe dimensions given for the short fuselage will work for the longfuselage.) ChuckOn Mon, Jan 2, 2017 at 2:42 PM, Decou, Norman wrote:>> I am currently attaching my fuselage sides. I have checked and rechecked> my dimensions. As the pictures show, I have an irregular bow inward at the> 2nd station from the back.>> I am using the long fuselage plans.>> The dimensions I am using measured from the tail are>> 1st strut 19.125" from the end of the tail 7 " across>> 2nd strut 41.5" from the end of the tail 11" across>> 3rd strut 68.375" from the end of the tail 17" across>> 4th strut 95.5`` from the end of the tail 22`` across>> Plan dimensions for the sides are 19.375-------19.375 total>>> 22.500-------41.875 total>>> 27.000-------68.875 total>>> 27.250-------96.125 total>> I recognize that there are slight differences between my dimensions and> the fuselage side dimensions. I believe that some of this is due to the> curve at the tail effectively reducing the length when the sides.>>> I just need to know if someone can identify my error.>>> I don`t want to arbitrarily change plan dimensions but I do not believe> this bow is intended to be there.>>> Any ideas or suggestions would be greatly appreciated,>> Norm>> ------------------------------> III>________________________________________________________________________________Subject: Pietenpol-List: Re: plane

Original Posted By: normdecou(at)aol.com
I haven't checked your measurements against my plans, I built the 1933 plans planeand it all seemed to work out. I would not want to have the reverse bow,I believe it will add un-needed stress to those joints. Surely there is a mistakesomewhere in the dimensions . I believe the most important area wouldbe the tail-post and the seat back station. I wouldn't want to wander toofar at those points, but I don't believe a variation of width between those twoto keep a smooth bow would hurt. That being said, I have found everytime I have strayed from the plans, somewheredown the line I regretted it. Just my opinion and it isn't worth much ha ha.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Tue, 3 Jan 2017 10:22:14 -0500

Original Posted By: "tools"
Norm,Don't know how I deleted my original reply, but from your 4th photo, it appearsthe tailpost is too wide. As others have chimed in, sawing it to the 1" thicknesswould be appropriate...Reverse bow, however, is another issue, and I concur; the bow needs to be eliminatedentirely, as others have already stated. Whatever length of crosspiecesis needed to achieve this should probably be notated on your set of plans. You have not stated - or I missed - whether your fuse width is per plans or slightlywider. This could be the driving issue if it is wider.... Best of luck with your build & Happy New Year!--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: plane

Original Posted By: normdecou(at)aol.com
This falls squarely in the "things that make you go hmmm...."zone.Seemed to happen a lot building model airplanes. As much as anything, different pieces of wood bend differently and will contribute.So, two choices as I see it. Just live with the result, I do not believeit introduces any detrimental stress. That sort of stress lives in all wingribs, and in the bend at the front of the fuse. Second, just cut to fit andensure a nice smooth curve. In this case, you will not be introducing enoughchange to cascade into a problem later. Some things do, and right quick, butnot there. When I rebuilt my fuse, main gear and fittings, and replaced the wing struts, Iwas pretty worried about inadvertent change to the rigging of the plane. But,it had to be done, figured I'd just do the best I could, and test fly very conservativelyand work from there. Turns out I could tell no difference. Thisplane lives right smack dab in the middle of the forgiving zone.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Tue, 3 Jan 2017 11:42:59 -0500