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Mastodon: AboutGet the appKeyboard shortcutsView source codev4.4.0-nightly.2025-04-15

#space

801 posts449 participants76 posts today
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MediaFaro Analysis

Govsatcom, Eutelsat, Iris2: Ukraine seeks European alternatives to Starlink.

The American Starlink satellite network is currently essential to the Ukrainian military forces on the ground. The threat to cut off Kyiv's access to the Starlink satellite network could have far-reaching consequences for the war.

To avoid this, Ukrainian authorities are seeking alternatives from the EU.

mediafaro.org/article/20250422

The Ariane 6 rocket launches from the European spaceport in Kourou, French Guiana. | Copyright AP Photo
Euronews · Govsatcom, Eutelsat, Iris2: Ukraine seeks European alternatives to Starlink.By Gregoire Lory
#Ukraine#WarInUkraine#Starlink
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ScienceOpen

'Stowage Analysis of a Flat Flexure Elastic Hinge for Deployable #Space Structures' - an AIAA Journal article by the American Institute of #Aeronautics and #Astronautics on #ScienceOpen: scienceopen.com/document?vid=c

ScienceOpenStowage Analysis of a Flat Flexure Elastic Hinge for Deployable Space Structures<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="first" dir="auto" id="d4790035e284">This paper introduces a design framework for elastically deformable hinges consisting of two parallel flat flexures, focusing on the case where the hinge is folded by 180 deg in the stowed configuration. The authors first consider architectures in which the flexures are staggered to avoid contact so that they can be modeled independently using Euler’s elastica. They next focus on the nonstaggered case when folding can result in contact between the flexures, which they study through finite element simulations. The paper provides a set of design guidelines by rationalizing the relationship between hinge dimensions and the allowable curvature in the flexure material. For most hinge geometries applicable to deployable structures, the authors find a simple requirement for the minimum flexure length as a function of the allowable curvature in the material, <span class="inline-formula"> <math display="inline" overflow="scroll"> <mrow> <msub> <mi>L</mi> <mi>h</mi> </msub> <mo>></mo> <mn>10.7</mn> <mo>/</mo> <msub> <mi>κ</mi> <mi>m</mi> </msub> </mrow> </math> </span>. Their analysis also provides insight into the reaction forces necessary to keep the hinge in the folded configuration, which is useful in determining the deployment dynamics and the constraints necessary to secure the panel in place during stowage. Experimental prototypes show good agreement with the numerical predictions. </p>
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Naveed

Chun's videos provide an unfiltered look into how four people live inside a spacecraft with an internal volume comparable to an SUV, and the awe of seeing something beautiful for the first time. His shares have an intimacy, authenticity, and most importantly. #space

arstechnica.com/space/2025/04/

Ars Technica · A Chinese-born crypto tycoon—of all people—changed the way I think of spaceBy Stephen Clark
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