Lupusprimus Posted November 5, 2018 Share Posted November 5, 2018 I've always wanted to make a little Skycrane fly. But the plastic model in 1:72 was rather too long for the available mechanics. There would have been problems with the rear engine, which is very far behind. So the thought died. Then about 3 months ago Ian (Wafu) wrote me if I could help him with his scratch project with some details. His desired decal set of the Forestale variant was drawn relatively fast. It's always a question of how well pictures or drawings are available as templates. Quote Link to post Share on other sites
Lupusprimus Posted November 5, 2018 Author Share Posted November 5, 2018 The design of the input and output parts of the engines was more complex. Only after pictures this was possible, but then Wafu had better material - the manual of the Skycrane. There are very good drawings and cracks in it, on the basis it draws much better. Quote Link to post Share on other sites
midnightprowler Posted November 5, 2018 Share Posted November 5, 2018 Looking forward to this! Quote Link to post Share on other sites
Lupusprimus Posted November 7, 2018 Author Share Posted November 7, 2018 Then I had slowly caught fire myself. I zoomed a three-sided tear (there is not much good there) to 1:35 and looked at the measurements. Only the Blade 230S or 250CFX could be used for the size mechanics. Both have a main gear with a diameter of 70 mm. But that was clearly too big. The fuselage was only 58 mm wide. So I had the idea to zoom the plan again to 1:32. That was enough. 64 mm fuselage width. I already used smaller gears on both helicopters several times (mostly with smaller pinions). 60 mm main gear is ok. Thus my planning began to build a flying Skycrane in the scale 1:32. Quote Link to post Share on other sites
Lupusprimus Posted November 8, 2018 Author Share Posted November 8, 2018 The basic shape of the fuselage is rather simple and could be constructed quickly (I use Fusion360). I learned this a half year ago in about 20 hours from an expert in learning by doing. Geometric bodies are no problem since then, non-geometric bodies (like the bow part) I can't really do yet. Quote Link to post Share on other sites
Lupusprimus Posted November 12, 2018 Author Share Posted November 12, 2018 This hull is halved and divided into segments (our printers can only print parts). These are printed as shell (to save material). The individual parts are glued and filled. The rear part remains deliberately extra. Quote Link to post Share on other sites
Lupusprimus Posted November 15, 2018 Author Share Posted November 15, 2018 Casting with silicone, casting with resin. Quote Link to post Share on other sites
midnightprowler Posted November 15, 2018 Share Posted November 15, 2018 How big is this gonna be? Quote Link to post Share on other sites
Lupusprimus Posted November 15, 2018 Author Share Posted November 15, 2018 The hull is 72 cm long. Quote Link to post Share on other sites
Lupusprimus Posted November 16, 2018 Author Share Posted November 16, 2018 The other moulds for deep drawing the fuselage parts were developed in similar steps. Quote Link to post Share on other sites
Lupusprimus Posted November 16, 2018 Author Share Posted November 16, 2018 On the first test deep trains you can see what still has to be changed. Quote Link to post Share on other sites
Lupusprimus Posted November 19, 2018 Author Share Posted November 19, 2018 Parallel to mould making, I designed and printed many add-on parts. First the engines were developed with several modifications. The basics for this came from Wafu, who builds the model in 1:35. Quote Link to post Share on other sites
Lupusprimus Posted November 19, 2018 Author Share Posted November 19, 2018 The engine was then (like many other parts) printed in 3D. Here input and output part "smoothed" (very smooth) and the main body "polished". Quote Link to post Share on other sites
Rotorman Posted November 21, 2018 Share Posted November 21, 2018 Well that's nice Quote Link to post Share on other sites
Lupusprimus Posted November 21, 2018 Author Share Posted November 21, 2018 Also the chassis legs were changed several times. The small details like the steps cannot be printed "polished". Quote Link to post Share on other sites
Lupusprimus Posted November 22, 2018 Author Share Posted November 22, 2018 So they had to be separated to print them "smoothed". Then the mounting pins were in the way again. Quote Link to post Share on other sites
midnightprowler Posted November 22, 2018 Share Posted November 22, 2018 What will the rotor diameter be? In inches please. Quote Link to post Share on other sites
Lupusprimus Posted November 22, 2018 Author Share Posted November 22, 2018 Main rotor 650 mm, tail rotor 157 mm. Quote Link to post Share on other sites
RCAFFAN Posted November 22, 2018 Share Posted November 22, 2018 (edited) 5 hours ago, Lupusprimus said: Main rotor 650 mm(25.5906 inches), tail rotor 157 mm (6.1811 inches). Fixed it for you.....(Another in the long line of Canadians explaining stuff to Americans 😃) Edited November 22, 2018 by RCAFFAN Quote Link to post Share on other sites
midnightprowler Posted November 22, 2018 Share Posted November 22, 2018 Will the main rotor be prototypical since it is a flying version? Quote Link to post Share on other sites
Lupusprimus Posted November 22, 2018 Author Share Posted November 22, 2018 @RCAFFAN: Thanks for the translation. @moídnightprowlwer: The production model will be clockwise, because the gyros do not allow counterclockwise rotation. If that was your question. Quote Link to post Share on other sites
midnightprowler Posted November 23, 2018 Share Posted November 23, 2018 No, I am wondering will it have a 6 blade main rotor like the real thing? Quote Link to post Share on other sites
Lupusprimus Posted November 24, 2018 Author Share Posted November 24, 2018 Yes, the Skycrane will fly with a six-leaf head like the original. Quote Link to post Share on other sites
Lupusprimus Posted November 24, 2018 Author Share Posted November 24, 2018 (edited) The nose gear was also revised several times. The one on the left was made after pictures, the one on the right was helped by the manual of the Skycrane. Edited November 24, 2018 by Lupusprimus Quote Link to post Share on other sites
Lupusprimus Posted November 25, 2018 Author Share Posted November 25, 2018 (edited) This is how it looks at the end. Edited November 25, 2018 by Lupusprimus Quote Link to post Share on other sites
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