Serkan Sen Posted January 8, 2020 Author Share Posted January 8, 2020 54 minutes ago, billn53 said: Good job creating the raised panel lines. That’s something I’ve never tried before. I presume success depends the type of putty used (water-based acrylic, solvent-based “Bondo”, etc.). What did you use? - Bill Thanks Bill, I have used standard "Revell Plasto" putty in blue tube which is very brittle. To get nicer raised panels with finer width I think a better adhesive and thinner filer is needed (maybe liquid filler like Mr. Surfacer 500?) which should not penetrate below the masking film. Serkan 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 8, 2020 Author Share Posted January 8, 2020 The opened areas of master parts were filled with modelling clay and the filler reservoirs were added to the ends: Next is to make the mold boxes and add mould locating pins. Serkan 6 Link to comment Share on other sites More sharing options...
billn53 Posted January 8, 2020 Share Posted January 8, 2020 1 hour ago, Serkan Sen said: Thanks Bill, I have used standard "Revell Plasto" putty in blue tube which is very brittle. To get nicer raised panels with finer width I think a better adhesive and thinner filer is needed (maybe liquid filler like Mr. Surfacer 500?) which should not penetrate below the masking film. Serkan If I recall correctly, I have seen an example of creating panel lines much like you did, but instead of spreading putty they sprayed Mr. Surfacer over the taped surface. 1 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 9, 2020 Author Share Posted January 9, 2020 (edited) The casting boxes were created using Lego bricks and they were fixed with modeling clay. The tail cone molds will be single piece whereas the nose parts will have two pieces molds. The dark green silicone is much softer and has higher elasticity than the light green. Therefore it is suitable to make single piece molds. The light green silicon has also good elasticity but stiff enough to keep separate mold parts together using alignment pins. Therefore I use it very often making multiple pieces molds. Serkan Edited January 9, 2020 by Serkan Sen 10 Link to comment Share on other sites More sharing options...
Petr Veselý Posted January 9, 2020 Share Posted January 9, 2020 Hello friends, great work done here. As to this blueprint its whole version is in a book Lockheed's SR-71 ''Blackbird'' Family by James Goodall and Jay Miller. But no top view. I have only wery blurry scan of this blueprint. 4 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 9, 2020 Author Share Posted January 9, 2020 4 hours ago, Petr Veselý said: great work done here. Thanks Petr. I am very close to complete A-12 mods. When I start to build other versions definetely I will need reliable drawings of them. Serkan 2 Link to comment Share on other sites More sharing options...
Hornet Posted January 9, 2020 Share Posted January 9, 2020 Great modelling skill. It seems that you are very close to complete the model. I am following with full interest... 1 1 Link to comment Share on other sites More sharing options...
Nikolay Polyakov Posted January 9, 2020 Share Posted January 9, 2020 13 hours ago, Serkan Sen said: The dark green silicone is much softer and has higher elasticity than the light green. Therefore it is suitable to make single piece molds. The light green silicon has also good elasticity but stiff enough to keep separate mold parts together using alignment pins. Therefore I use it very often making multiple pieces molds. Even your casting work with a lego bricks and silicone looks so aesthetic. 👍 I like to see your progress here, Serkan! Keep up the good work. 1 Link to comment Share on other sites More sharing options...
Space Ranger Posted January 10, 2020 Share Posted January 10, 2020 7 hours ago, Nikolay Polyakov said: Even your casting work with a lego bricks and silicone looks so aesthetic. 👍 I like to see your progress here, Serkan! Keep up the good work. Serkan's Lego bricks and silicone remind me of a Mondrian painting and look better than most of my models! 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 10, 2020 Author Share Posted January 10, 2020 (edited) 9 hours ago, Nikolay Polyakov said: 23 hours ago, Serkan Sen said: Even your casting work with a lego bricks and silicone looks so aesthetic. 👍 I like to see your progress here, Serkan! Keep up the good work. Thanks Nikolay. Yesterday I have already casted the parts but not checked the results yet. Serkan Edited January 10, 2020 by Serkan Sen 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 10, 2020 Author Share Posted January 10, 2020 2 hours ago, Space Ranger said: Serkan's Lego bricks and silicone remind me of a Mondrian painting and look better than most of my models! What we are all doing is also kind of art strongly supported with engineering 👨🎨👷♂️😁 Serkan 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 10, 2020 Author Share Posted January 10, 2020 (edited) The inner halves of nose section molds were casted: The pins added here are the resin injection holes. Edited January 12, 2020 by Serkan Sen 5 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 10, 2020 Author Share Posted January 10, 2020 (edited) Here are the cured mold halves of upper and lower front nose parts: The below image explains the mold in detail: The molds are ready to produce test parts. Serkan Edited January 12, 2020 by Serkan Sen 12 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 12, 2020 Author Share Posted January 12, 2020 (edited) First the tail cone parts were casted to test molds: The molds are fine but the it seems that the shelf life of resin was over 😞 As clearly seen from above image, the casted part starts to bleed/sweat oily liquid when the part is trimmed. I had this badly/costly experienced during my Flanker T-10M family and Flankerstein modifications: I have recycled the old resin and casted the parts with new one and now everything is fine: Next is to duplicate nose parts. Serkan Edited January 12, 2020 by Serkan Sen 12 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 13, 2020 Author Share Posted January 13, 2020 (edited) The front fuselage halves were also casted: When all the parts are brought together it looks like this: Next is the nose landing gear bay. Serkan Edited January 16, 2020 by Serkan Sen 18 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 16, 2020 Author Share Posted January 16, 2020 (edited) Few copies of Revell/Monogram nose wheel bay were duplicated. The Italeri wheel bay is shorter but wider than Revell/Monogram. Therefore two duplicates were used to produce Italeri wheel bay. The side walls were taken from one copy whereas the details and upper wall is from the other one: The resulting wheel bay was shown in the lower right image (the casted part next to black one). Next is to duplicate new wheel bay for other planned Blackbird projects and start to put all parts together. Serkan Edited January 16, 2020 by Serkan Sen 15 Link to comment Share on other sites More sharing options...
Nikolay Polyakov Posted January 16, 2020 Share Posted January 16, 2020 Excellent progress so far, Serkan! Thank you for sharing these techniques with us. 👏 1 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 16, 2020 Author Share Posted January 16, 2020 (edited) 1 hour ago, Nikolay Polyakov said: Excellent progress so far, Serkan! Thank you for sharing these techniques with us. 👏 Thanks lot Nikolay, I couldn't have made progress up to this level without all of yours support... 🙏 Edited January 16, 2020 by Serkan Sen 2 Link to comment Share on other sites More sharing options...
Robert Posted January 16, 2020 Share Posted January 16, 2020 Hi Serkan, may be a silly question but in your first picture from Monday's posting can you explain how you did this. Did you keep injecting the resin from the bottom until it was filled to the top ? Regards Robert 2 Link to comment Share on other sites More sharing options...
Andwil Posted January 16, 2020 Share Posted January 16, 2020 This is brilliant work, loving it! AW 1 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 17, 2020 Author Share Posted January 17, 2020 (edited) On 1/16/2020 at 11:52 PM, Robert said: Hi Serkan, may be a silly question but in your first picture from Monday's posting can you explain how you did this. Did you keep injecting the resin from the bottom until it was filled to the top ? Regards Robert Hi Robert, This is in fact very good question. My early molds had no such injection hole and I was trying to cast the parts with gravity fill method (up to bottom). But most of the time this was causing trapped air between the mold and poured resin due to very thin part thickness and relatively long part length. Therefore I prefer injection molding with bottom to up method as it lets the air escaping easily without trapping inside the mold. Of course the mold has to be designed not to cause any air trapping... Serkan Edited December 22, 2020 by Serkan Sen 6 Link to comment Share on other sites More sharing options...
Robert Posted January 17, 2020 Share Posted January 17, 2020 Hi Serkan, thanks for the explanation. First time l have heard of this way of forming parts and it works well. I have now learnt of other ways of casting my own parts. Regards Robert 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 17, 2020 Author Share Posted January 17, 2020 (edited) The nose wheel main strut cross beam was built from plastic card which was missing in Italeri/Testors kit. Also the mold forms for both nose wheel bay and cross beam parts were done: The casted new nose wheel bay was glued to lower front fuselage half: Next step is to finish tail cone lower half... Serkan Edited January 17, 2020 by Serkan Sen 11 Link to comment Share on other sites More sharing options...
Serkan Sen Posted January 17, 2020 Author Share Posted January 17, 2020 15 hours ago, Andwil said: This is brilliant work, loving it! AW Thanks Andy... 1 Link to comment Share on other sites More sharing options...
woody37 Posted January 17, 2020 Share Posted January 17, 2020 Now that’s impressive craftsmanship 1 Link to comment Share on other sites More sharing options...
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