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roma847

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About roma847

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    Filderstadt, Germany

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  1. roma847

    Launch 14 - Cooper's Rocket

    Very impressive start with the beam framework. Do you have to cut all the profies individually or have you a cutting tool like the Chopper? Source: evergreenscalemodels.com
  2. Thanks Mark, they clean their prints already a bit, but they needed to do it more thoroughly, which would take more time, but time is money ...
  3. Thanks Rich for your nice congrats! Yep, the IT looks clean as a whistle, as the saying goes. If one knows how to do it, Ultrasonic cleaning is really easy, and now I have the know-how, and all of you too ... One either needs sa good equipment, or one has a good dentist with a helpful lab team. BTW, the IT already has its SOFI and is ready for priming and painting.
  4. Hello everybody, after the tough struggle for the rings of the ET now back to the grooves of the last FUD-IT, whose ultrasonic cleaning in the Dental lab was still on the agenda. For that I had procured the recommended intensive cleaner TICKOPUR R 60, which we wanted to use based on the conditions recommended by BANDELIN. Soure: bandelin.com Since this cleaner i.a. Sodium hydroxide (5-15%), also called caustic soda, caution was bidden, which is why protective gloves were required. After the nice colleagues of the ChiliDent Lab were back on board after their short break, it was finally time and the Final Countdown was imminent. In the beginning of May in my #1457 I had presented the critical areas with the strongest wax nests and captured in pictures. In order to shorten the cleaning time, we have increased the concentration of the TICKOPUR to approx. 20 %. Through the rubber ring, the height of the glass insert in the ultrasonic bath could be adjusted so that it hung about 3 cm above the bottom of the tub, which is as important for optimal cleaning as filling the tub with the same solution, that the boss has personally mixed. Due to the size of the glass insert, the Intertank could be inserted lengthwise, which is also advantageous for the cleaning effect. After setting the thermostat to 70 °C, the appliance was switched on by the assistant, and the bath began to bubble. After every 30 minutes, the IT was turned a quarter turn further. Overall, the cleaning time was about three hours. After that, the tank looked white and completely clean, which one could already see at first glance. So finally the work was done, and with a tip into the kitty I thanked me once again and light-hearted said goodbye. And as one can see in this photo, the cleaning was really perfect, because there are no wax residues left, which is why no aftertreatment was required too. This is especially also illustrated by comparing the photos before and afterwards. And here once again a few pictures of both ITs in comparison, where the FUD-IT looks even more filigree than the WSF-IT. Nevertheless, I think that one can use both ITs, depending at whim and purse.
  5. Thanks Mass, as said, I know such Profile Gauges, but I can hardly imagine creating this groove structure therewith evenly across the entire circumference and over the entire length of the ET.
  6. Dear friends, sadly we must take note that Donald H. Peterson, one of the crew members of STS-6, passed away a few days ago. Source: commons.wikimedia.org Seated are Paul J. Weitz (left), crew commander, and Karol J. Bobko, pilot. Standing are Donald H. Peterson (left) and Story Musgrave, both mission specalists. Source: flickr.com (NASA Kennedy) This sad news consternates me deeply, especially since Paul J. Weitz left recently too. Forever remembered, may they all rest in peace ...
  7. Hi everybody, last but not least, in the NSF forum I have still found now a Hi-Res. photo of the during STS-6 used ET-108 on which one can recognize this structure very well on the long LH2 Tank, which confirms my previous imagination. Source: nasaspaceflight.com (woods170) As one can see on this, in the SOFI insulation foam there is in fact a uniformly rounded wave structure, which possibly was to be realized either as 3D print (WSF) or by means of my envisaged variant of Evergreen strip-rings + Flour technique. And that also explains now the alternating light-dark effect of the bands, which is not a color effect, but only created by the shadows of the "hills" in the "valleys".
  8. roma847

    Launch 14 - Cooper's Rocket

    Impressive progress with this fagile PE parts, keep cool and have a calm touch.
  9. Thanks Keith, I know such Profile Gauges, but I can hardly imagine creating this groove structure therewith evenly across the entire circumference and over the entire length of the ET.
  10. Hi everybody, in the ARC Forum I got an interesting hint to Simon Atkinson, who used a lathe for simulating the grooves in his External tank. He is a professional modeler and illustrator since more than 40 years and here is his awesome Shuttle stack (1/72), which is currently (2016) in store at The London Science Museum. Source: satkinsoncreativearts.com A similar technique, e.g. by engraving the grooves, I have already imagined, but unfortunately I have no lathe, which would probably need a CNC control to get even intervals. But for that, 1/72 is of course much more workable, especially since the grooves should be at least 2 mm apart. This approach is marvelous, but if you take a closer look at its texture, the grooves for my taste are a bit too pronounced and smooth, because only perfect even grooves are created with the lathe, and thus seem almost a bit artificial. Nevertheless, I think that this structure could also be simulated for a 1/144 ET, if one can realize the corresponding spacings of approx. 1 mm by a clever 3D modeling of a narrow and very flat wave-like ring structure by creating fine grooves (approx. 0,3 mm) in about 1 mm intervals, much like between the fine ribs in the Thrust Panels. Regarding the Spray On Foam Insulation (SOFI) of the ETs one has to distinguish early and later missions, as for the Orbiter's TPS Tiles and Blankets. In the earlier missions like STS-6, this wave-like ring structure was more pronounced, while it is less or barely visible in later missions. Later at the SLWTs, the SOFI was also much more evenly applied and reworked.
  11. Thanks Guys, yep, this technique is really awesome.
  12. Thanks for your nice tips, regarding the steel comb, this is almost impossible to realize because the distances of the grooves of only approx. 1 mm are much too small. The same would apply to the thread, which would also only create a spiral. This is really a tricky matter ...
  13. I fully agree with you, Rich. That was an ingenious idea of my friend, which immediately convinced and absolutely thrilled me, even though the typical Instafoam ring structure is missing ...
  14. I fully agree with you, Rich, that's all right. As I said, I could also imagine a Scratch solution. For this one would have to glue "only" about 170 flat Evergreen strips, maybe 0,25 mm x 0,5 mm or 0,25 mm x 0,75 mm, each at a distance of about 0,5 mm around the ET, followed by a Flour technique coating, whereby this wave-shaped ring structure could arise. This one could check out in a test with a little less strips.
  15. Thanks Mark and Michael for your well-meant comments, but the overall "pebbled" or rough surface of the Istafoam structure I can create by using the Flour technique that my Raumcon friend (inselaner) invented, no problem. The tricky problem is the fine band or ring structure on the surface, which could be simulated possibly by WSF 3D printing, if one were to model a narrow and very flat wave-like ring structure by creating fine grooves (approx. 0,3 mm) in about 1 mm intervals, much like between the fine ribs in the Thrust Panels. Because of these minimal distances, a removal of narrow rings out of a first flour coating is impossible, especially since this layer is only wafer-thin, sorry Mark. I hope that the matter has become a bit clearer now.
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