Serkan Sen Posted October 15, 2019 Author Share Posted October 15, 2019 (edited) 8 hours ago, billn53 said: I’d like to see the open fuel dump. Can you point me to some photos? First M-21 fuel dump: This is the M-21 photo showing vents Here is A-12 fuel dump: YF-12 fuel dump: YF-12 has also these vents: And SR-71 fuel dump: I like very much this photo: Serkan Edited October 15, 2019 by Serkan Sen 7 4 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 15, 2019 Author Share Posted October 15, 2019 6 hours ago, Graeme H said: Interesting in reading the data display with that aircraft saying it is painted, in a deep near black shade of blue. There is a great AIAA paper about Blackbirds (I don't remember exactly from where I have downloaded but either from CIA or NASA site) "Design and Development of the Blackbird: Challenges and Lessons Learned Peter W. Merlin* TYBRIN Corporation, NASA Dryden Flight Research Center" On Page 16: "The Blackbirds earned their nickname because they were coated with a high-emissivity black paint for improved heat radiation, thus reducing thermal stresses on the airframe. The first A-12 initially flew unpainted. Early models in the A-12 and YF-12A series were subsequently painted black only on the periphery of the airframe where heating was greatest: on chines, leading and trailing edges, and rudders. Engineers soon realized it would be advantageous to take advantage of Kirchoff’s law of Radiation that describes how a good heat absorber, such as a black body any extremely dark object), is also an efficient heat emitter. Although convective heating decreases with increasing altitude, heat radiation occurs independently of altitude. Therefore, in late 1963, Skunk Works engineers decided to take advantage of the black-body radiation phenomenon by painting the A-12 fleet and subsequent variants entirely black." The different shades of black even dark blue is all infact black. The environmental and operational conditions caused black paint weathered. Serkan 3 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 15, 2019 Author Share Posted October 15, 2019 Just now, Serkan Sen said: There is a great AIAA paper about Blackbirds (I don't remember exactly from where I have downloaded but either from CIA or NASA site) I found it here 🙂 1 2 Link to comment Share on other sites More sharing options...
Nikolay Polyakov Posted October 15, 2019 Share Posted October 15, 2019 4 hours ago, Serkan Sen said: I like very much this photo: And I know why... The wind tunnel models have a separate nose sections - that’s your style of modelling, Serkan! 😉 Without a doubt, tese models haven’t had any shape issues... 1 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 15, 2019 Author Share Posted October 15, 2019 1 hour ago, Nikolay Polyakov said: And I know why... The wind tunnel models have a separate nose sections - that’s your style of modelling, Serkan! This is the "Power of Habit"... I did my PhD on CFD and WTT... 😁✈✈✈ 3 2 Link to comment Share on other sites More sharing options...
Nikolay Polyakov Posted October 15, 2019 Share Posted October 15, 2019 1 hour ago, Serkan Sen said: I did my PhD on CFD and WTT... 😁✈✈✈ Ah, it’s very respected I must say! 🤝 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 15, 2019 Author Share Posted October 15, 2019 (edited) I have used YF-12 parts to make seamless front and rear canopies and prepared the master pieces to create molds: Then I have filled the molds with soft silicone: Next step is to cast canopy and windshield copies to use in forming final nose shape. Serkan Edited October 15, 2019 by Serkan Sen 11 Link to comment Share on other sites More sharing options...
Nikolay Polyakov Posted October 15, 2019 Share Posted October 15, 2019 4 hours ago, Serkan Sen said: Next step is to cast canopy and windshield copies to use in forming final nose shape. Casting the clear parts... It’s becoming more and more interesting, Serkan! Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 15, 2019 Author Share Posted October 15, 2019 2 hours ago, Nikolay Polyakov said: Casting the clear parts... It’s becoming more and more interesting, Serkan! I did it already for my Su-27IB conversion and Su-33UBM "What If" projects 🙂 2 Link to comment Share on other sites More sharing options...
billn53 Posted October 16, 2019 Share Posted October 16, 2019 15 hours ago, Serkan Sen said: I did it already for my Su-27IB conversion and Su-33UBM "What If" projects 🙂 Any concerns about the cast clear parts yellowing over time? 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 16, 2019 Author Share Posted October 16, 2019 1 hour ago, billn53 said: Any concerns about the cast clear parts yellowing over time? My existing clear epoxy resin needs additional compound to increase UV resistance. I have not experienced yet how the casted parts will look like after a year. There are some crystal clear resin suppliers in ebay from UK claiming that their products are UV resistant and not yellowing ower time. Serkan 2 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 17, 2019 Author Share Posted October 17, 2019 Yesterday I have casted some copies of canopy parts using PUR. The results are really good. These parts will be used in giving the final shape of upper front fuselage half. Also YF-12 clear parts will be casted using these molds to get seamless canopy parts. Serkan 9 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 21, 2019 Author Share Posted October 21, 2019 The inner surface shapes of both canopies have been mapped onto plastic card using masking film and the windows were opened: The frame halves were placed and some details were added: Some improvements are needed to close the gap between the rear canopy and kit frame: Next is to fit front canopy and windshield. Serkan 8 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 21, 2019 Author Share Posted October 21, 2019 The original SR-71 kit "glare shield" (or "instrument shroud" 🙂 ) is too big to fit inside YF-12 windshield. I have trimmed the original shroud to fit (the black half) and removed it from modified part (gray one): The temporary windshield was glued with super glue. The front canopy had also fit issues. But this was relatively easy to fix: The sharp edge around windshield was also rounded: Next step is to give front fuselage upper half to its final shape... Serkan 10 Link to comment Share on other sites More sharing options...
Uncle Uncool Posted October 21, 2019 Share Posted October 21, 2019 Hi Serkan, A-12 is not my bag, but I've been wrestling my own Italeri 1/48 SR-71A Sled kit for quite a long spell now to no avail. I'm trying not to get discouraged and give up on my build with the advent of the new kit by @JeffreyK With regard to your build - lately, on my build, for every issue I've overcome I seem to find two or three more issues. Last one is the kit windshield, which not only it has convex panel surfaces, but also it lacks the curve at the base, which adapts to the upper fuselage. It's this curve on the base of the windshield which actually gives the Habu that evil look when spotted from the front. Here you've got a good piccy when viewed from the side Then again, it's the wrong geometry on the windshield glass panels on the Italeri kit. Panels are flat on the real thing, just as on the F-106. There, another one Judging by the windshield on the kit; do you think I would end with a hole right in the middle of the panels if I take a file to try and make them flat? I haven't got the piece with me right now, but you seem to know your Sled pieces like the back of your hand. How thick could the panels be in the kit? Very expert modelling skills you're endowed with, by the way! Cheers, Unc2 PS: Wonder whether or not you're going to make some clear resin windshields in 1/48th scale. 2 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 22, 2019 Author Share Posted October 22, 2019 (edited) 12 hours ago, Uncle Uncool said: Judging by the windshield on the kit; do you think I would end with a hole right in the middle of the panels if I take a file to try and make them flat? I haven't got the piece with me right now, but you seem to know your Sled pieces like the back of your hand. How thick could the panels be in the kit? Very expert modelling skills you're endowed with, by the way! Thanks for your kind words 🙂 It is not easy to build an accurate Blackbird derivative from existing kits available in the market. At the beginning I thought that it shouldn't be so difficult... The windshield is the one of the biggest pain in the neck. As you said having the Habu evil look is not possible with the existing kit parts and massive modification is required on this area including windshield, front canopy and nose. YF-12 kit has relatively better clear parts and therefore I have cloned these parts and used them as starting point. The windshield is not perfect but at least has correct height and width. It has also flat windows. I have also a mostly finished Sr-71B in 1:48 scale. But I think I need to give a break when I complete this project before starting 1:48 mods. The plastic itself is thicker than 1mm that can tolerate light sanding/filing. But I would recommend to support the surface from inside by gluing 1mm polystyrene card in any case. Regarding to clear parts in 1:48 I will definetely do when I start that mods. Regards Serkan Edited October 22, 2019 by Serkan Sen 4 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 22, 2019 Author Share Posted October 22, 2019 (edited) This will be the next one in my list 🙂 The whitebird not the lady 😁 Serkan Edited October 22, 2019 by Serkan Sen 2 1 6 Link to comment Share on other sites More sharing options...
Brandy Posted October 22, 2019 Share Posted October 22, 2019 If you don't need her I may be able to take her off your hands. How much is postage? Ian 1 4 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 22, 2019 Author Share Posted October 22, 2019 (edited) 45 minutes ago, limeypilot said: If you don't need her I may be able to take her off your hands. How much is postage? I am afraid that you won't get out of box what you want to have! Neither the bird nor the chick will be as expected (or dreamed)... Serkan Edited October 22, 2019 by Serkan Sen 4 Link to comment Share on other sites More sharing options...
Brandy Posted October 22, 2019 Share Posted October 22, 2019 That's exactly why I'm still single! Ian 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 22, 2019 Author Share Posted October 22, 2019 35 minutes ago, limeypilot said: That's exactly why I'm still single! Ian You are a lucky man!.. Serkan 1 Link to comment Share on other sites More sharing options...
Rizon Posted October 22, 2019 Share Posted October 22, 2019 On 10/15/2019 at 1:16 PM, Serkan Sen said: This is the "Power of Habit"... I did my PhD on CFD and WTT... 😁✈✈✈ Nice to see there is another Aerodynamicist here! 🙂 Gruß R 2 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 23, 2019 Author Share Posted October 23, 2019 The front upper half is now almost ready: The A-12 Oxcart will look like this: And M-21 will look like as follows: The planform view of single and double seater versions: The A-12B modification will be done after duplicating the front fuselage upper half. Serkan 6 Link to comment Share on other sites More sharing options...
Shalako Posted October 23, 2019 Share Posted October 23, 2019 On 10/16/2019 at 5:16 PM, billn53 said: Any concerns about the cast clear parts yellowing over time? Hi Bill, Check out Hannants if they have the following product: GUNZE B522, MR.SUPER CLEAR UV CUT GLOSS SPRAY I believe a coat or two of this product can protect any vacuform or resin clear part. Cheers Bill (aka Shalako) 1 Link to comment Share on other sites More sharing options...
Serkan Sen Posted October 24, 2019 Author Share Posted October 24, 2019 My assistant is impatient to see the result: - I want this bird!.. 5 4 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now