Richard Wicker Posted August 11, 2007 Share Posted August 11, 2007 Hi all.I'm thinking of drawing up plans for a sixth scale Junkers J1. The idea of doing an accurate job of the corrugated skin isn't putting me off, but I thought I'ld pick the brains of the rest of you scale builders regarding corrugations in this scale. It's accuracy i'm after, not a "quick-fix" stand off representation. Quote Link to comment Share on other sites More sharing options...
Mike Stevens Posted August 11, 2007 Share Posted August 11, 2007 RichardSlaters Plastikard do corrugated sheets for roofing in the model railway world in various sizes to suit a number of scales. It generally comes in A4 sized sheets. You might? be able to do a final skin ove with it?http://www.slatersplastikard.com/Plastikard/slaters%20embossed_plastikard1.htmMike Quote Link to comment Share on other sites More sharing options...
Mike Rolls Posted August 11, 2007 Share Posted August 11, 2007 For the really masochistic - I saw a reproduction of corrugations in an Americam plan many years ago where the designer had used a purpose made steel 'comb' with the gaps between the 'teeth' semi-circular in shape so that he could use it to form balsa into a grooved cross-section to give him a corrugated sheet - then it was a case of stripping out the raised portions, giving him, in effect, semi-circular beading which was then applied at the appropriate spacing. This was a long time ago - perhaps folks had more patience then! To be fair to him, he used it to represent corrugated skin on the control surfaces of a light a/c. The Junkers would be quite a challenge!Mike Quote Link to comment Share on other sites More sharing options...
Richard Wicker Posted August 11, 2007 Author Share Posted August 11, 2007 Thanks guys.I've heard of the "balsa comb" idea before Mike. A similar method is to form a groove in a hardwood block to fit a length of dowel of the right diameter, then epoxy a razor blade flat at a slight angle across the groove, so as to slice the dowel into two semi-circular lenghts when it's fed through. These "corrugations" are then applied to the model at the correct spacing, as per your post.I agree it would be a challenge, but it may be the most realistic method...... Unless anyone knows better?? Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted August 12, 2007 Share Posted August 12, 2007 RichardFirst thing comes to mind over sheeted areas is a series of "external" stringers glued on.Fairly easy to apply (compared to some methods) ,very strong,light & of course will go around curves if there are any on the Junkers! Call me old fashioned but I 'd probably apply tissue & dope with a stiffish brush to follow the contours beefore spraying topcoat ????Grumpy Myron Quote Link to comment Share on other sites More sharing options...
Steve biplane Posted August 12, 2007 Share Posted August 12, 2007 It's one thing to obtain the corrugations in the balsa but then you have to apply surface finish and rub down (EVENLY) sufficiently well to represent a metal surface. It would need a lot more patience than I've got, good luck. There's got to be a better way. Quote Link to comment Share on other sites More sharing options...
Richard Wicker Posted August 12, 2007 Author Share Posted August 12, 2007 Steve, it's like one of those Zen meditation exercises, switch off the mind and go with the flow etc. LOL.Think positive, at least with the J1, the corrugations are only on the wings and tail, the fuselage is clear..............Just got "Ergun funfzig" amount of rivets to worry about on the armoured front section! Quote Link to comment Share on other sites More sharing options...
Richard Wicker Posted August 12, 2007 Author Share Posted August 12, 2007 Hi Myron.I like that idea, a test section done that way is on the cards. Also adding talc to the dope I think, (for the first couple of coats anyway).One good thing, with the size and shape of the wing section, I wont have any trouble squeezing the servos in! Quote Link to comment Share on other sites More sharing options...
kdc Posted August 18, 2007 Share Posted August 18, 2007 There are 3 methods of corrugation I have seen published.1 A very early 1980's Scale Aircraft Special ( MAP/Argus/ Nexus) showed how someone made a rolling (mangle type ) device to corrugate litho plate!2. A method to make Tiger Moth tank corrugations from card with slots cutin Gordon Whiteheads book.3 A method of covering the model in corrugated cardboard was shown in some mag. Seems the easiest idea.If you seriously want to try 1 or 2 I know I have the article. At the moment I cannot remember where 3 was published. Quote Link to comment Share on other sites More sharing options...
Richard Wicker Posted August 19, 2007 Author Share Posted August 19, 2007 Thanks kdc, i was thinking of the corrugated card idea at one point but i think it would soon show "hanger rash".The litho idea seems good and i may experiment down that road.Just been checking some data on the J1. It seems that when scaled out to 1/6th, the corrugations would be 1.5mm high with 7.5mm centres. (Unless i made a big boo-boo with the calculator!) Quote Link to comment Share on other sites More sharing options...
kdc Posted August 22, 2007 Share Posted August 22, 2007 I think the corrugated cardboard would have been doped or resined to strengthen it. What about using corrugated cardboard as a mould for fibreglass sheets to skin the model? Quote Link to comment Share on other sites More sharing options...
kdc Posted September 6, 2007 Share Posted September 6, 2007 There was a 3 page article on making corrugations in the RCME Scale Aircraft Special 1984. This illustrates the method used by Peter Neate and also Arthur Searles method. Quote Link to comment Share on other sites More sharing options...
DDH Posted April 9, 2008 Share Posted April 9, 2008 Mike Eccles of Southport MAC built an 11' wing span Ju52/3 and used corrugated cardboard soaked in pva glue. You might like to contact him for the application details. He and his model were on the front page of BMFA News april 07 Issue 87 - looks great (the Ju52/3 that is).Mike Eccles of Southport MAC built an 11' wing span Ju52/3 and covered the fuz with corrugated paking paper soaked in pva glue (may have been diluted). The model appeared on the font cover of the April 07 (Issue 81) of the BMA News - looked great. You may care to contact him for further details.In case you missed my previous posts I give below examples of the SIG corrugated scale covering for control surfaces, which comes in sheets 0.01" thin.Part no's are SIGRPCP2571 (8" x 17") and SIGRPCP2572 (6.5" x 13.5") - note the latter distance between corrugations is greater than the former. sizing up ..... on the model .......... - this is not mine but from mag pics of a father and son built scale model of a Cessna Bird Dog in vietnam coloursBest of luck with your project. Quote Link to comment Share on other sites More sharing options...
Richard Wicker Posted April 9, 2008 Author Share Posted April 9, 2008 Thanks to everyone for the advice on this topic, it's going to take a while to sort it all out I think, but yes, it will be built. Perhaps construction details and pics can be posted on the site if anyone would be interested. Quote Link to comment Share on other sites More sharing options...
Former Member Posted April 9, 2008 Share Posted April 9, 2008 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Lew Weaver Posted October 25, 2008 Share Posted October 25, 2008 Any progress on the Junkers Richard?I am building the C.L.I and have the foam wings covered with corrugated card. Quote Link to comment Share on other sites More sharing options...
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