Original Posted By: "Hubbard, Eugene"
Kent and Doug and Gene,Gene remembers correctly, there is a height error on one of the elevationson the rib dimensions. It is discussed in the archives and/or listed in theknown plan errors. The full sized plan view will be right only if thetemperature and humidity are luckily correct at the moment you are viewingit and if the paper wasn't stretched in handling some time and so on. Ilooked at the measurement between the spars on mine and it was off by abouta half an inch. That would certainly have upset things when I got to wingassembly.Doug, could you fix the one bad dimension and get a big plotter to draw fullsized rib plans on something dimensionally stable? Sell those if thePietenpol family allows, or get them to sell them. That would be a lotbetter for all involved than using the full sized paper plan. Of course,Kent is really doing it right. But, measure twice. I did mine and wasmeasuring from the bottom of the board that I used and did it in too much ofa hurry. Luckily, PF Beck, down in Aiken stopped by to visit and brought arib with him. When layed on top of mine there was a difference. I hadabout a 1/4 inch less height where I had subtracted the the difference tothe bottom of the board in my head and not rechecked. Luckily, I only havefive ribs to trash.My two cents gentlemen. I thought my eyes were going buggy for a few minutes! So now I'm> going to spend good money on good tools, especially measurement tools. I> will now lay out my rib with a compass and dividers, reading off mytrusty> 6" Starret rule.>> Learning lessons inch by inch in windy, snowy Oklahoma,>> Kent>> Kent:> Be careful laying out the dimensions on the drawing also--- I put them in> AutoCad to confirm the accuracy of the rib drawings I received with the> plans, and they did NOT match. So, I used the full size plan view.> "Measure twice, cut once!"> Doug>> Be careful laying out the dimensions on the drawing also--- I put them in> AutoCad to confirm the accuracy of the rib drawings I received with the> plans, and they did NOT match. So, I used the full size plan view.> "Measure twice, cut once!"> Doug>>> My memory is that at least one of the height measurements on the plansputs> a kink in the rib. It's pretty obvious which one is off--I think it's afew> inches back from the leading edge.>> Gene Hubbard>> >> This is probably not the measurement Gene mentions, but at the leadingedge> on the rib drawing it shows 1-1/2" height. It's the first measurement.> What's that for?>> Kent>> ----->> A fool-proof way of building your Piet ribs correctly is> available here-----no to mention all the other full size plans> for the plane. I can't imagine trying to build off the F&G mags.>> Mike C.>> $15 plus 1.67 to ship.>> > I have all the plans from Donald, and he sent the full size rib drawing.I> don't have the F&G magazine. But I have heard mention of plans changing> with temp and humidity, so I want to draw them out. If I find myself tobe> a bad artist, then it will be time to use the drawing. I'll give itanother> try tonight.>________________________________________________________________________________