Snorry Posted November 5, 2010 Share Posted November 5, 2010 Marcos, I will wait for results of your experiments - and, more, for completed Fokker. And I hope it takes not a waste amount of time if you put one another method of ribbing to test :) This is hand-made tool for scribing: Made of steel, 100 mm in lenght, 7 mm wide. Blade radius on tips is different. By this tool those ribs were made: This is 1/48, but tool (may be in slightly scaled down form) should be useful in 72. I just make such tool from saw blade (5 mm wide) and test it. It really works and works quickly, but scalpel is still needed for fine tuning, removing small longitudinal scratches between ribs. I estimate that the entire wing set of an airplane like Fokker may be ribbed using this tool in one day. Quote Link to post Share on other sites
Marcos Borges Posted November 5, 2010 Author Share Posted November 5, 2010 Hi Snorry. I hope complete this model. I have a huge attraction for incomplete models in my shelves ;) I figured out now an way to simulate the ribs looking to your picture. I don´t know if it is exactly what you think. The idea (obviously an old one) is to scribe the ribs from the inside of two thin wing panels in a way that the line appears like raised from the outside. I will try this this weekend and post here. Cheers, Marcos. Quote Link to post Share on other sites
neca12 Posted November 6, 2010 Share Posted November 6, 2010 Could yu take pictures of the process? It would be nice to see it ;) Quote Link to post Share on other sites
Marcos Borges Posted November 8, 2010 Author Share Posted November 8, 2010 For sure neca12. I did not tried it yet. This weekend only some work in the engine and airbrushing in the propeller with the base wood color and a coat of Future. Cheers, Marcos. Quote Link to post Share on other sites
BOC262 Posted November 8, 2010 Share Posted November 8, 2010 For details on creating the wing rib effect using the embossing technique, see this online version of Harry Woodman's classic scratch building book: http://web.archive.org/web/20080122044909/...ry/woodman.html The book is a true classic, a treasure trove of information, invaluable for anyone wanting to give a try at scratch building airplane models. Quote Link to post Share on other sites
Marcos Borges Posted November 9, 2010 Author Share Posted November 9, 2010 Many Thanks BOC262! It is really a interesting book. I`m reading it now and learning some fine tips. The page about creating wing ribs gave me very good information. Cheers, Marcos. Quote Link to post Share on other sites
BOC262 Posted November 9, 2010 Share Posted November 9, 2010 Many Thanks BOC262!It is really a interesting book. I`m reading it now and learning some fine tips. The page about creating wing ribs gave me very good information. Cheers, Marcos. I'm glad you are finding the book helpful. Good luck with your project! You have made a great start. Quote Link to post Share on other sites
HOLMES Posted November 10, 2010 Share Posted November 10, 2010 Marcos great updates and good work ' Keep it up HOLMES Quote Link to post Share on other sites
Marcos Borges Posted February 22, 2011 Author Share Posted February 22, 2011 Hi guys, After a long time without working on this model I finally tried the technique of scribing the ribs from inside. I used a ballpoint pen and I think the result until now is good. Here are some pictures: Cheers, Marcos. Quote Link to post Share on other sites
Marcos Borges Posted February 23, 2011 Author Share Posted February 23, 2011 Trying to compare the two methods. The left with usual scribing and the right with pressing the ribs from inside. I'm not satisfied with the results yet. Probably I have to make a tool like the one Snorry showed. Cheers, Marcos. Quote Link to post Share on other sites
Snorry Posted February 23, 2011 Share Posted February 23, 2011 Marcos, its great you have resumed this interesting project! Go ahead! Quote Link to post Share on other sites
tnuag Posted February 24, 2011 Share Posted February 24, 2011 Marcos, To do the reverse-scribing of Harry Woodman we use the back of a No.11 scalpel blade. Neil Quote Link to post Share on other sites
Marcos Borges Posted February 24, 2011 Author Share Posted February 24, 2011 Thanks Snorry! Neil, thanks for the hint. I will look for this blade. Cheers, Marcos. Quote Link to post Share on other sites
HOLMES Posted March 12, 2011 Share Posted March 12, 2011 Marcos the left scrbed ones looks great ... why do you press the ribs from the inside ..what does that do ...?curious.. Quote Link to post Share on other sites
Marcos Borges Posted March 12, 2011 Author Share Posted March 12, 2011 Hi Holmes. It is to try to simulate the fabric over the ribs. But I don´t achieved a good result yet. Cheers, Marcos. Quote Link to post Share on other sites
MattC Posted March 13, 2011 Share Posted March 13, 2011 If you made a board with some raised (low relief, something like thin strips of thin card) "ribs" could you not vac form a sheet of styrene down onto it, and then cut the wing from the "pre-ribbed" sheet? If you set the vaccum really low, so that the plastic just sags between the high points rather than being sucked down hard over them? Quote Link to post Share on other sites
tnuag Posted March 13, 2011 Share Posted March 13, 2011 If you made a board with some raised (low relief, something like thin strips of thin card) "ribs" could you not vac form a sheet of styrene down onto it, and then cut the wing from the "pre-ribbed" sheet? If you set the vaccum really low, so that the plastic just sags between the high points rather than being sucked down hard over them? I think that a low vacuum would just give what I call a 'jelly mould'. Neil Quote Link to post Share on other sites
MattC Posted March 13, 2011 Share Posted March 13, 2011 I think that a low vacuum would just give what I call a 'jelly mould'. I don't know, possibly, I'm just throwing ideas around with little in the way of expertise to back them up! Thinking about scale sizes, ribs made from 1/64" balsa sheet would scale up just under an inch, leading edge potentially from 1mm carbon tube, trailing edge from styrene strip. Cover with thin mylar or acetate and paint. The transparent covering would allow light to show through and reveal the structure. Fiddly though. Quote Link to post Share on other sites
tnuag Posted March 14, 2011 Share Posted March 14, 2011 (edited) I don't know, possibly, I'm just throwing ideas around with little in the way of expertise to back them up! Thinking about scale sizes, ribs made from 1/64" balsa sheet would scale up just under an inch, leading edge potentially from 1mm carbon tube, trailing edge from styrene strip. Cover with thin mylar or acetate and paint. The transparent covering would allow light to show through and reveal the structure. Fiddly though. That is why we use etched brass for the airframes in most of our Historic Wings kits. We were aiming for that see-though and thus fragile look. We supply Litespan film, which is a heat-shrink film and thus goes nice and taught to show the ribs. I have been playing around with this idea for years, then when the centenary of flight yeatr came round (2003) we did the Wright Flier - everything else just followed, although seing the replica Santos Dumont aircraft in Rio de Janeiro was another nudge! Neil Edited March 14, 2011 by tnuag Quote Link to post Share on other sites
MattC Posted March 14, 2011 Share Posted March 14, 2011 Etched brass certainly makes a lot of sense and I am impressed with the results you have shown I have to say, but its just beyond what I could do myself I think. Litespan is lovely stuff, use it a lot on smaller RC stuff, its a little prone to slackening IMHO, but thats probably due to big temperature variations from going outside and inside fairly frequently. Some of the indoor free flight coverings might also be quite nice, Condenser paper is available down to about 8 gsm. But your models look awesome, so I won't teach you to suck eggs Quote Link to post Share on other sites
tnuag Posted March 14, 2011 Share Posted March 14, 2011 Etched brass certainly makes a lot of sense and I am impressed with the results you have shown I have to say, but its just beyond what I could do myself I think.Litespan is lovely stuff, use it a lot on smaller RC stuff, its a little prone to slackening IMHO, but thats probably due to big temperature variations from going outside and inside fairly frequently. Some of the indoor free flight coverings might also be quite nice, Condenser paper is available down to about 8 gsm. But your models look awesome, so I won't teach you to suck eggs While I am obvipusly biased, I have been pleasantly suprised at how easily they build - for example one of those complicated wings only has four parts, the left wing ribs, right wing ribs and two spars. Also if you can use a soldering iron it helps because you get instant joints! We have done 7 pioneer aircraft now (Spin, Demoiselle and Cayley glider were delivered to Hannnants last Saturday). Of them all, the Cayley Glider has to be the simplest. Anyway to each his own, but if we hadn't tried the method we would have missed a golden oportunity to model some early aircraft convincingly. It is very satisfying when the first test etch arrives and assembles easily. Sufficient I think! Neil Quote Link to post Share on other sites
Marcos Borges Posted March 15, 2011 Author Share Posted March 15, 2011 (edited) If you made a board with some raised (low relief, something like thin strips of thin card) "ribs" could you not vac form a sheet of styrene down onto it, and then cut the wing from the "pre-ribbed" sheet? If you set the vaccum really low, so that the plastic just sags between the high points rather than being sucked down hard over them? Thanks for your ideas sirs. MattC, I would have to make a vacuform machine, which is an old project and now may be the time to do it. Besides it I have some pictures sent by a friend that did a good job with thread. I also won some dentist tools from my wife that I think will help ;) I hope make some experiments soon and go forward with this model. Cheers, Marcos. Edited March 15, 2011 by Marcos Borges Quote Link to post Share on other sites
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