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spaceman

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About spaceman

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  1. Tamiya 1/70 Apollo WIP

    Hi Pete, this Video demonstrates the ultrasonic cleaning in fast motion, before cleaning, and after 3 hours cleaning. Source: bandelin.com
  2. Tamiya 1/70 Apollo WIP

    Hi Pete, Michael Key's 3D LES looks fantastic, is it FUD? What do you think of ultrasonic cleaning?
  3. Hello everybody, and now back to the 3D Intertank, where Michael Key is coming down the stretch after his considering of my last little changes. And just now, my "special" friend and helper DaveS in the NSF Forum comes out of the wood and presents me this interesting photo of the Access Door at STS-31 (1990), unfortunately without source. But after I've found the image in Google, I recognized it from the URL, according to which it comes from the collection of George Gassaway, which I know by now. Source: georgesrockets.com (George Gassaway) And since I found a similar photo of the STS-30 (1989), I suspect that since the use of the Leightweight Tanks (LWT), starting at STS-6, such doors were installed, which apparently also had a foam insulation. Source: georgesrockets.com (George Gassaway) For this also militates this photo of my friend James MacLaren, which also shows such a door in the background. The image shows the Challenger on Pad 39-B, probably during the preparation for her fateful final mission STS-51L (1986), what I still will find out. Source: forum.nasaspaceflight.com (James MacLaren) Consequently the photo used so far for the 3D modeling shows a Graphite-Composite door, as has been used later on the Super Lightweight Tanks (SLWT), Source: NASA like here at the STS-133 (2011). Source: NASA For Michael Key's 3D-Modeling this realization is coming too late unfortunately, but which is not a problem, because I can glue this door with the two handles later on, especially since it is very small (9 mm x 8 mm), as one can see here.
  4. Thanks southwestforests for your sense of searching for the source of this photo of the Intertank-Access Door, shown by Michael Key. You've hit the nail on the head!!! I had thought of a Mock-up right away. In this article one can find this photo with its originator Jacques van Oene. And in this Article I have found many other interesting photos, such as also this photo of the Carrier Plate, which is only five Stringers above the Access Door, as we meanwhile know. Very interesting details.
  5. Hello everybody, let's go step by step on our way to the goal, here are the next images of Michael Key's 3D modeling. As one can see in this image, he has omitted both the six plates in the door and adjusted their size, as well as he had corrected the distances of the AD and the CP from each other and from the Thrust Panel. Source: shapeways.com/forum (Michael Key) The position of the CP, however, remained unchanged and still sits too high up, although I had already marked it in this last image, Source: NASA what one can also see in this photo. Source: forum.nasaspaceflight.com (Jester) Furthermore, it is noticeable that the bottom plate of the large LO2 Fairing admittedly is flush with the stringers, but not that of the small LH2 Fairing, Source: shapeways.com/forum (Michael Key) which is still to be corrected, according to the following photo, but hopefully will not cause any problems. Source: NASA Then here are two more images of the small supports of the GH2/GO2 Press. Lines (2''), first with the indicated lines, Source: shapeways.com/forum (Michael Key) and here the final design without the lines, whereby the thin wires (Ø 0.3 mm) will separately be inserted later and covered with small caps. Source: shapeways.com/forum (Michael Key) Now I hope that these last changes can also be considered by him, according to which an upload of the 3D model to Shapeways nothing would stand in the way. But Michael Key wanted to be honest and told me, that there are some very small parts in this model that could possibly overstrain Shapeways' possibilities, so the model might not pass their inspections the first time around. That would be normal, and Shapeways would let him know the problem, which he would correct. That's why I'm very curious, but initially his modified model is still due.
  6. Hello everybody, there are progresses to be reported of Michael Key's intertank modeling. After the number of Stringers (108) and that of the Ribs (52) have been clarified, we now have to clarify some further details on the Intertank, which are marked in this image, some of which have already been integrated into Michael's model. Source: NASA Here are his latest 3D pictures, whereby I wondered at first about these six plates in the Access Door, that I've never seen before. Furthermore, I noticed that the size and location of the Access Door (AD) and the Carrier Plate (CP) cannot be quite right, Source: shapeways.com/forum (Michael Key) which is why I determined them more precisely based on photos, wherefore I used the agreed reference size 1 Stringer+Valley = 1,3 mm. At first I used this great direct view of the Carrier Plate, which has almost no perspective distortions, what should be considered. For the determination and conversion of the measures, the following explanation of my numbers in the photos with and without mm is necessary, so that one does not get confused. Numbers without mm are measured values in the respective photo, and Numbers with mm are the converted measurements in 1/144. And if one compares this photo with his model, stands out that the distance D2 of the Carrier Plate from the Thrust Panel is too large because it should be only 2 Stringer+Valley (2,6 mm). Source: NASA With this distance and the determined dimensions of the Carrier Plate of 3.5 mm x 5.0 mm (W x H) I am afterwards in this photo of the Access Door boarded, which unfortunately is not so distortion-free in the area of the door. And in this photo one can see that the door is flat and has no attached panels. Source: NASA Here's a similar picture at which the access door panel is removed, which is attached with 44 flat profile screws. Source: NASA Thus, the Access Door and the Carrier Plate would have the following dimensions: Access Door: 9,1 mm x 7,7 mm (W x H) Carrier Plate: 3,5 mm x 5,0 mm (W x H) As one can see in the following image, the Fairings of the LO2 Feedline (17'') and of the GH2 Press. Line (2'') were added, as well as the LH2 PAL Ramp and the LO2 PAL Ramp, as well as the Supports for the two Press. Lines and the associated Cable Trays. Thereto Michael has suggested to omit the two thin Press. Lines and the Cable Trays, as they would go beyond the intertank anyway and could possibly break off during printing or transport. He was worried about the PAL Ramps. While the LO2 PAL Ramp could survive at the top, he fears that the LH2 PAL Ramp could probably break because it's very long and thin. So he asked if he should cut them off at the ends of the Intertank, which I agree with. Since I anyway want to insert the LO2 Feedline and the Press, he should omit them away, but not the Cable Trays, because I could continue them to the front and backwards. Then I still showed him these two photos, on which one can see that the bottom plates of the Fairings are flush with the stringers and not put onto, what he has accepted and wants to change. Source: NASA Source: NASA These were essentially my hints and correction wishes. Regarding of his plates attached on the Access Door, which I had queried, he sent me this photo here, which surprised me, since I did not have seen it yet. That's why I asked him if he had any source, whereby it could possibly be a Mock-up. I believe that shows once again that a timely and consensual coordination of such details is important for a smooth process, that's why one never stops learning.
  7. Thanks southwestforests for the nice words.
  8. Hello everybody, after having been more intensively involved with the AFTC rings that have been printed meanwhile by Shapeways and tested by me, I want to go back to the 3D modeling of the Intertank wherewith Michael Key had started last December, what I've been posting about. Therefor I had sent him in the result of my research my drawing and the estimated Stringer dimensions without and with foam insulation, where actually only the dimensions with foam insulation for his 3D modeling are relevant. Thereupon he had to adjust his 3D model once again, which I as a 3D rookie have not imaginated so complicated, but which should turn out to be a fallacy. At the beginning of the year he told me that he has meanwhile modeled another version with these stringer dimensions, given by me, Source: shapeways.com/forum (Michael Key) consisting of each 26 Stringers in the two Thrust Panels and of each 40 Stringers in the intervening Stringer Panels. But somehow I immediately stumbled over his number of 40, that's totally 80 stringers in the Stringer panels, which I was very surprised because I dimly remembered a number 108 in our German Raumcon discussions, wherewith the confusion around numbers and terms started at the beginning of my project start (11/2011). After intensive researches I finally found the explanation in the System Definition Handbook SLWT, in which the Intertank structure is described quite well. Source: Space Shuttle/External Tank System Definition Handbook SLWT After that one has to distinguish the following terms: While in the six Skin/Stringer Panels (45°) there are each 18 of these Stringers, one speaks in the two Thrust Panels of Ribs, whereby in each case 26 parallel ribs as well as seven circumferential ribs are integrated in these panels, Therewith was clarified at least the number of stringers, namely 108, which showed that Michael Key's 3D model had with totally only 80 too little stringers. And now I had to explaine this fact heavy-heartedly Michael Key, whereby I was afraid that he would lynch me for it. Thereupon he was very disappointed and had initially thrown in the towel quite frustrated. But of course, I did not want to give up that fast ... On the other hand, it would probably have been more useful to distribute the Stringer number onto the circumference of the eight 45° panels, whose drawing he had also been given by me. But in hindsight one is always smarter than before ... In the meantime, I did it my way both for the six Stringer Panels and for the two Thrust Panels with following results and sent it to him, in the hope that he would have an insight as well as a good will. Long story short, therewith I obviously had affected his honor, so that he was ready to go on. But I had to confirm to him that it would finally remain, in each case 54 stringers in the Stringer panels (135°) and in each case 26 ribs in the two Thrust panels (45°), whereupon I gave him my word and was jolly glad.
  9. Thanks Brian for your nice compliment, I also think that the ASTCs in combination with the Bare-Metal foil strips will look awesome. One can really fall in love with these 3D parts.
  10. Space Shuttle Discovery STS-41D

    Hi Mike, sorry, but what is 0,5 mm, the width of one mesh in square? On the other hand, the strands already seem to be about 1 mm ... And how thick or how high is this stuff, which looks so rough? No offence, Mike, but my hair is standing on end, if you want to use this fly screen for the Tower floors ... This is Stainless Steel Wire Mesh, 40 Mesh, Wire Diameter 0,01 in and should be suitable better for 1:144. BTW, you are right, the LVM Detail kits are unfortunately scaled to the scale mix of the Revell Launch Tower kit. Think about it again, but do whatever you want.
  11. Thanks friends, and also after two days, the state of the Bare-Metal Foil stripes is unchanged stable, and looks very well.
  12. Space Shuttle Discovery STS-41D

    Hi Mike, your fiberglass door screen is too coarse for the grids and can never be less than 0,05 mm, maybe you mean 0,05 inch ... BTW, this is a PE flor grid by LVM Studios.
  13. Hello everybody, and even after a day, the strips are still gluing unchangedly in place, so that the decision for the Bare-Metal Foil (New Improved Chrome) has fallen. Then I wanted to see how the stripes on the ASTC would look like, and was pleasantly surprised again. Cutting these approx. 7 mm long and 1 mm wide strips and gluing over the dividing lines between the segments, however, proved to be the expected delicate matter, because one has hellishly to take care when handling with cutter and/or tweezers, so that the very thin foil does not tear off. And as one can see, the dividing lines under the stripes are becoming slightly visible, but the same can also be seen on this photo from the STS-43 at a higher magnification. Source: flickr.com (NASA on The Commons) All in all, a completely successful matter with these 3D-ASTCs, which was worth all the effort.
  14. Thanks Uwe for your useful tips. I still have to collect the experience with the 3D parts. According to Shapeways guideline, one only should clean the parts in acetone to remove any remaining wax: "If there is any residual oil or wax support material left over from the production process, this can easily be removed using acetone or Simple Green solvent. You can simply dip and air dry the model. Or, using a paint brush, you can lightly spread the solvent on the train and air dry."
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