Original Posted By: Michael Hinchman
Let's take a break from bashing those that shouldn't owna computer.I am lofting my rib jig. I have the full size papertemplate but it is off by 1/8" on the spar spacing.I work for a copier company and have no trust of lines on anything copied.How do you define the angle on the front of the rib?Is it the line between the top of the rib at 1/2" fromthe le (2" from baseline) and the bottom of the rib at1 1/2" from the le (3/8" from baseline)? That is whatthe Don Pietenpol plans infer but the perpendicular fromthat line through the cl of the le 1 1/2" above baselineis less than the 1" thickness of the leading edge.DaveLofting away in Retsof, NY.________________________________________________________________________________
Pietenpol-List: Rib lofting questions
Pietenpol-List: Re: Rib lofting questions
Original Posted By: steve(at)byu.edu
Good, question. I don't have the answer right off. I'll think aboutit. But I would like to through something else into the 'Rib Lofting'ring. Has anyone ever produced a 2D CAD drawing of the rib? I wasthinking about doing just this. That way I could plot a 1:1 of the ribanytime I needed to, or for someone else. My plotter will make a 1:1plot within .002"+/- with this size of paper. This would sure make,making a rib jig easier.Greg YotzDave and Connie wrote:> Let's take a break from bashing those that shouldn't own> a computer.>> I am lofting my rib jig. I have the full size paper> template but it is off by 1/8" on the spar spacing.> I work for a copier company and have no trust of> lines on anything copied.>> How do you define the angle on the front of the rib?> Is it the line between the top of the rib at 1/2" from> the le (2" from baseline) and the bottom of the rib at> 1 1/2" from the le (3/8" from baseline)? That is what> the Don Pietenpol plans infer but the perpendicular from> that line through the cl of the le 1 1/2" above baseline> is less than the 1" thickness of the leading edge.>> Dave> Lofting away in Retsof, NY.________________________________________________________________________________
Good, question. I don't have the answer right off. I'll think aboutit. But I would like to through something else into the 'Rib Lofting'ring. Has anyone ever produced a 2D CAD drawing of the rib? I wasthinking about doing just this. That way I could plot a 1:1 of the ribanytime I needed to, or for someone else. My plotter will make a 1:1plot within .002"+/- with this size of paper. This would sure make,making a rib jig easier.Greg YotzDave and Connie wrote:> Let's take a break from bashing those that shouldn't own> a computer.>> I am lofting my rib jig. I have the full size paper> template but it is off by 1/8" on the spar spacing.> I work for a copier company and have no trust of> lines on anything copied.>> How do you define the angle on the front of the rib?> Is it the line between the top of the rib at 1/2" from> the le (2" from baseline) and the bottom of the rib at> 1 1/2" from the le (3/8" from baseline)? That is what> the Don Pietenpol plans infer but the perpendicular from> that line through the cl of the le 1 1/2" above baseline> is less than the 1" thickness of the leading edge.>> Dave> Lofting away in Retsof, NY.________________________________________________________________________________
Pietenpol-List: Rib lofting questions
Original Posted By: Greg Yotz
I made my jig by locating the spars in the correct location first. thenmeasuring and plotting the points on the jig and then lofting the curves.Putting in the internal bracing was done "freehand" referencing the plansafter the outlines was done on the jig.Steve e.-----Original Message-----Dave and ConnieSent: Wednesday, April 07, 1999 9:56 PMSubject: Pietenpol-List: Rib lofting questionsLet's take a break from bashing those that shouldn't owna computer.I am lofting my rib jig. I have the full size papertemplate but it is off by 1/8" on the spar spacing.I work for a copier company and have no trust oflines on anything copied.How do you define the angle on the front of the rib?Is it the line between the top of the rib at 1/2" fromthe le (2" from baseline) and the bottom of the rib at1 1/2" from the le (3/8" from baseline)? That is whatthe Don Pietenpol plans infer but the perpendicular fromthat line through the cl of the le 1 1/2" above baselineis less than the 1" thickness of the leading edge.DaveLofting away in Retsof, NY.________________________________________________________________________________
I made my jig by locating the spars in the correct location first. thenmeasuring and plotting the points on the jig and then lofting the curves.Putting in the internal bracing was done "freehand" referencing the plansafter the outlines was done on the jig.Steve e.-----Original Message-----Dave and ConnieSent: Wednesday, April 07, 1999 9:56 PMSubject: Pietenpol-List: Rib lofting questionsLet's take a break from bashing those that shouldn't owna computer.I am lofting my rib jig. I have the full size papertemplate but it is off by 1/8" on the spar spacing.I work for a copier company and have no trust oflines on anything copied.How do you define the angle on the front of the rib?Is it the line between the top of the rib at 1/2" fromthe le (2" from baseline) and the bottom of the rib at1 1/2" from the le (3/8" from baseline)? That is whatthe Don Pietenpol plans infer but the perpendicular fromthat line through the cl of the le 1 1/2" above baselineis less than the 1" thickness of the leading edge.DaveLofting away in Retsof, NY.________________________________________________________________________________
Pietenpol-List: Re: Rib lofting questions
Original Posted By: steve(at)byu.edu
I tried to put the rib plan form into my cad program. The problem I raninto was that the drawing (on wing plan sheet) doesn't have enough datapoints to do the leading edge properly. It's been a while since I tried itbut I seem to recall that as the problem. I've done it with other airfoilswith no problem. Most NACA airfoils give coordinates as a percentage ofchord and they work well. If I get a chance, I'll try the Piet airfoilagain and see what I come up with.Greg Yotz wrote:> Good, question. I don't have the answer right off. I'll think about> it. But I would like to through something else into the 'Rib Lofting'> ring.> Has anyone ever produced a 2D CAD drawing of the rib? I was> thinking about doing just this. That way I could plot a 1:1 of the rib> anytime I needed to, or for someone else. My plotter will make a 1:1> plot within .002"+/- with this size of paper. This would sure make,> making a rib jig easier.>> Greg Yotz>> Dave and Connie wrote:>> > Let's take a break from bashing those that shouldn't own> > a computer.> >> > I am lofting my rib jig. I have the full size paper> > template but it is off by 1/8" on the spar spacing.> > I work for a copier company and have no trust of> > lines on anything copied.> >> > How do you define the angle on the front of the rib?> > Is it the line between the top of the rib at 1/2" from> > the le (2" from baseline) and the bottom of the rib at> > 1 1/2" from the le (3/8" from baseline)? That is what> > the Don Pietenpol plans infer but the perpendicular from> > that line through the cl of the le 1 1/2" above baseline> > is less than the 1" thickness of the leading edge.> >> > Dave> > Lofting away in Retsof, NY.--David B.Schober, CPEInstructor, Aviation MaintenanceFairmont State CollegeNational Aerospace Education CenterRt. 3 Box 13Bridgeport, WV 26330-9503(304) 842-8300________________________________________________________________________________
I tried to put the rib plan form into my cad program. The problem I raninto was that the drawing (on wing plan sheet) doesn't have enough datapoints to do the leading edge properly. It's been a while since I tried itbut I seem to recall that as the problem. I've done it with other airfoilswith no problem. Most NACA airfoils give coordinates as a percentage ofchord and they work well. If I get a chance, I'll try the Piet airfoilagain and see what I come up with.Greg Yotz wrote:> Good, question. I don't have the answer right off. I'll think about> it. But I would like to through something else into the 'Rib Lofting'> ring.> Has anyone ever produced a 2D CAD drawing of the rib? I was> thinking about doing just this. That way I could plot a 1:1 of the rib> anytime I needed to, or for someone else. My plotter will make a 1:1> plot within .002"+/- with this size of paper. This would sure make,> making a rib jig easier.>> Greg Yotz>> Dave and Connie wrote:>> > Let's take a break from bashing those that shouldn't own> > a computer.> >> > I am lofting my rib jig. I have the full size paper> > template but it is off by 1/8" on the spar spacing.> > I work for a copier company and have no trust of> > lines on anything copied.> >> > How do you define the angle on the front of the rib?> > Is it the line between the top of the rib at 1/2" from> > the le (2" from baseline) and the bottom of the rib at> > 1 1/2" from the le (3/8" from baseline)? That is what> > the Don Pietenpol plans infer but the perpendicular from> > that line through the cl of the le 1 1/2" above baseline> > is less than the 1" thickness of the leading edge.> >> > Dave> > Lofting away in Retsof, NY.--David B.Schober, CPEInstructor, Aviation MaintenanceFairmont State CollegeNational Aerospace Education CenterRt. 3 Box 13Bridgeport, WV 26330-9503(304) 842-8300________________________________________________________________________________
Pietenpol-List: Re: Rib lofting questions
Original Posted By: Greg Yotz
Greg Yotz wrote:> > Good, question. I don't have the answer right off. I'll think about> it. But I would like to through something else into the 'Rib Lofting'> ring.> Has anyone ever produced a 2D CAD drawing of the rib? I was> thinking about doing just this. That way I could plot a 1:1 of the rib> anytime I needed to, or for someone else. My plotter will make a 1:1> plot within .002"+/- with this size of paper. This would sure make,> making a rib jig easier.> > Greg Yotz> > Dave and Connie wrote:> > > Let's take a break from bashing those that shouldn't own> > a computer.> >> > I am lofting my rib jig. I have the full size paper> > template but it is off by 1/8" on the spar spacing.> > I work for a copier company and have no trust of> > lines on anything copied.> >> > How do you define the angle on the front of the rib?> > Is it the line between the top of the rib at 1/2" from> > the le (2" from baseline) and the bottom of the rib at> > 1 1/2" from the le (3/8" from baseline)? That is what> > the Don Pietenpol plans infer but the perpendicular from> > that line through the cl of the le 1 1/2" above baseline> > is less than the 1" thickness of the leading edge.> >> > Dave> > Lofting away in Retsof, NY.Greg, please do this. I'd like to have one. Let me know the price.Thanks and may you be blessed with a tailwind. Randy Gaskins randy(at)icomnet.com________________________________________________________________________________
Greg Yotz wrote:> > Good, question. I don't have the answer right off. I'll think about> it. But I would like to through something else into the 'Rib Lofting'> ring.> Has anyone ever produced a 2D CAD drawing of the rib? I was> thinking about doing just this. That way I could plot a 1:1 of the rib> anytime I needed to, or for someone else. My plotter will make a 1:1> plot within .002"+/- with this size of paper. This would sure make,> making a rib jig easier.> > Greg Yotz> > Dave and Connie wrote:> > > Let's take a break from bashing those that shouldn't own> > a computer.> >> > I am lofting my rib jig. I have the full size paper> > template but it is off by 1/8" on the spar spacing.> > I work for a copier company and have no trust of> > lines on anything copied.> >> > How do you define the angle on the front of the rib?> > Is it the line between the top of the rib at 1/2" from> > the le (2" from baseline) and the bottom of the rib at> > 1 1/2" from the le (3/8" from baseline)? That is what> > the Don Pietenpol plans infer but the perpendicular from> > that line through the cl of the le 1 1/2" above baseline> > is less than the 1" thickness of the leading edge.> >> > Dave> > Lofting away in Retsof, NY.Greg, please do this. I'd like to have one. Let me know the price.Thanks and may you be blessed with a tailwind. Randy Gaskins randy(at)icomnet.com________________________________________________________________________________
Pietenpol-List: Re: Rib lofting questions
Original Posted By: Doug Sheets
Thanks David.I'm going to give it a try too after I get back from Sun'n'Fun.Maybe I can mail someone who has ribs to over lay and see how close I get.Greg YotzDavid B. Schober wrote:> I tried to put the rib plan form into my cad program. The problem I ran> into was that the drawing (on wing plan sheet) doesn't have enough data> points to do the leading edge properly. It's been a while since I tried it> but I seem to recall that as the problem. I've done it with other airfoils> with no problem. Most NACA airfoils give coordinates as a percentage of> chord and they work well. If I get a chance, I'll try the Piet airfoil> again and see what I come up with.>________________________________________________________________________________
Thanks David.I'm going to give it a try too after I get back from Sun'n'Fun.Maybe I can mail someone who has ribs to over lay and see how close I get.Greg YotzDavid B. Schober wrote:> I tried to put the rib plan form into my cad program. The problem I ran> into was that the drawing (on wing plan sheet) doesn't have enough data> points to do the leading edge properly. It's been a while since I tried it> but I seem to recall that as the problem. I've done it with other airfoils> with no problem. Most NACA airfoils give coordinates as a percentage of> chord and they work well. If I get a chance, I'll try the Piet airfoil> again and see what I come up with.>________________________________________________________________________________
Pietenpol-List: Re: Rib lofting questions
Original Posted By: robert hensarling
You guys that are going to look into the cad drawings maywant to have rulers printed on the drawings in both theX and Y directions. Paper is not very stable with humidity.I wouldn't be a bit surprised to see 1/8" or more changein the length of a Piet rib. Now if you run drafting mylar you will have something that the epoxy won't stickto. Lofting isn't that big of a deal. I should have a webpage up in a few days showing how to build a rib jig.My plan is to document my project by putting up a usermanual type of site.Dave________________________________________________________________________________
You guys that are going to look into the cad drawings maywant to have rulers printed on the drawings in both theX and Y directions. Paper is not very stable with humidity.I wouldn't be a bit surprised to see 1/8" or more changein the length of a Piet rib. Now if you run drafting mylar you will have something that the epoxy won't stickto. Lofting isn't that big of a deal. I should have a webpage up in a few days showing how to build a rib jig.My plan is to document my project by putting up a usermanual type of site.Dave________________________________________________________________________________
Pietenpol-List: Re: Rib lofting questions
Original Posted By: Larry Neal
Dave and Connie wrote:> > You guys that are going to look into the cad drawings may> want to have rulers printed on the drawings in both the> X and Y directions. Paper is not very stable with humidity.> I wouldn't be a bit surprised to see 1/8" or more change> in the length of a Piet rib. Now if you run drafting> mylar you will have something that the epoxy won't stick> to.> > Lofting isn't that big of a deal. I should have a web> page up in a few days showing how to build a rib jig.> My plan is to document my project by putting up a user> manual type of site.> > DaveDave, I'm looking foward to your wing rib jig instructions and website. Please keep us informed. Thanks, Randy Gaskinsrandy(at)icomnet.com. May you be blessed with a tailwind.________________________________________________________________________________
Dave and Connie wrote:> > You guys that are going to look into the cad drawings may> want to have rulers printed on the drawings in both the> X and Y directions. Paper is not very stable with humidity.> I wouldn't be a bit surprised to see 1/8" or more change> in the length of a Piet rib. Now if you run drafting> mylar you will have something that the epoxy won't stick> to.> > Lofting isn't that big of a deal. I should have a web> page up in a few days showing how to build a rib jig.> My plan is to document my project by putting up a user> manual type of site.> > DaveDave, I'm looking foward to your wing rib jig instructions and website. Please keep us informed. Thanks, Randy Gaskinsrandy(at)icomnet.com. May you be blessed with a tailwind.________________________________________________________________________________
Pietenpol-List: Re: Rib lofting questions
Original Posted By: Gary Gower
I agree with the user manual so we have more guidelines. That would makeme get another IPS so I could get to it and they other good sites.Keep up the good work Dave & ConnieGordon>Dave and Connie wrote:>> >> You guys that are going to look into the cad drawings may>> want to have rulers printed on the drawings in both the>> X and Y directions. Paper is not very stable with humidity.>> I wouldn't be a bit surprised to see 1/8" or more change>> in the length of a Piet rib. Now if you run drafting>> mylar you will have something that the epoxy won't stick>> to.>> >> Lofting isn't that big of a deal. I should have a web>> page up in a few days showing how to build a rib jig.>> My plan is to document my project by putting up a user>> manual type of site.>> >> Dave>Dave, I'm looking foward to your wing rib jig instructions and web>site. Please keep us informed. Thanks, Randy Gaskins>randy(at)icomnet.com. May you be blessed with a tailwind.__________________________________________________________________________________________
I agree with the user manual so we have more guidelines. That would makeme get another IPS so I could get to it and they other good sites.Keep up the good work Dave & ConnieGordon>Dave and Connie wrote:>> >> You guys that are going to look into the cad drawings may>> want to have rulers printed on the drawings in both the>> X and Y directions. Paper is not very stable with humidity.>> I wouldn't be a bit surprised to see 1/8" or more change>> in the length of a Piet rib. Now if you run drafting>> mylar you will have something that the epoxy won't stick>> to.>> >> Lofting isn't that big of a deal. I should have a web>> page up in a few days showing how to build a rib jig.>> My plan is to document my project by putting up a user>> manual type of site.>> >> Dave>Dave, I'm looking foward to your wing rib jig instructions and web>site. Please keep us informed. Thanks, Randy Gaskins>randy(at)icomnet.com. May you be blessed with a tailwind.__________________________________________________________________________________________