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Lupusprimus

Building report about a Sikorsky S-64F Skycrane in scale 1:32, which can then fly

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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.

 

s64f105.thumb.jpg.ce25eb78deef274485704614a09d43a6.jpg

 

 

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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.

s64f106.jpg.f237fdad4bd82d0655cfe940e6454a6b.jpg

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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.

 

1685751311_DSR01.png.1649ef9ccfaa919d810dda919aae4b71.png

 

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.

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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.


s64f109.jpg.6cc423570ffffb74c5be4a72ff56198d.jpg

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This hull is halved and divided into segments (our printers can only print parts). These are printed as shell (to save material).

 

s64f111.jpg.152f3e380d9efe153a077a8d029ff704.jpg

 

The individual parts are glued and filled. The rear part remains deliberately extra.

 

s64f112.jpg.2378c8c8fd16355432cfd5c53528edee.jpg

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The other moulds for deep drawing the fuselage parts were developed in similar steps.s64f119.jpg.79fb970da29afe0fd839aa12a1b2c479.jpg

 

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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.s64f11.jpg.797c2b413154df631a17be34f237dfcd.jpg

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The engine was then (like many other parts) printed in 3D. Here input and output part "smoothed" (very smooth) and the main body "polished".

 

s64f106.jpg.31773eb258517bca3eabcfad741e9f00.jpg

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Also the chassis legs were changed several times. The small details like the steps cannot be printed "polished". s64f42.jpg.e508f4784273529d34713274ac11920f.jpg

 

 

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So they had to be separated to print them "smoothed". Then the mounting pins were in the way again.

 

s64f121.jpg.9070e3c56d1de55ead169f1de610e3a3.jpg

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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 by RCAFFAN

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@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.

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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.

 

s64f43.jpg.e885ae7238d4e983abe6cf0965652c5a.jpg

Edited by Lupusprimus

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