https://bugs.kerbalspaceprogram.com/https://bugs.kerbalspaceprogram.com/favicon.ico?15601711372018-12-16T06:44:29ZSquad BugtrackerKerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1086962018-12-16T06:44:29ZAnonymous
<ul><li><strong>Description</strong> updated (<a title="View differences" href="/journals/108696/diff?detail_id=178334">diff</a>)</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1086972018-12-16T06:47:16ZAnonymous
<ul><li><strong>Description</strong> updated (<a title="View differences" href="/journals/108697/diff?detail_id=178335">diff</a>)</li></ul><p>The report from the forum: <a class="external" href="https://forum.kerbalspaceprogram.com/index.php?/topic/180544-ksp-loading-a-closer-look-into-update-16/&do=findComment&comment=3504410">https://forum.kerbalspaceprogram.com/index.php?/topic/180544-ksp-loading-a-closer-look-into-update-16/&do=findComment&comment=3504410</a></p> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1086982018-12-16T07:04:02ZAnonymous
<ul><li><strong>File</strong> <i>drag race.craft</i> added</li><li><strong>File</strong> <i>dragrace.craft</i> added</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1091952018-12-23T05:20:50ZAnonymous
<ul><li><strong>Version</strong> changed from <i>1.5.1</i> to <i>1.6.0</i></li><li><strong>Expansion</strong> <i>Core Game</i> added</li><li><strong>Expansion</strong> deleted (<del><i>Making History</i></del>)</li></ul><p>Now that the Terrier and Spark have variants, with version 1.6.0, this affects the core game.<br />If you put the default-variant Terrier between two 1.25-m parts, those neighboring parts get the drag of flat-plates of nearly half their cross-sectional area.</p>
<p>The difference in drag between variants are tiny compared to the difference with versus without the shroud. It is straightforward to add a custom drag specification (attached unvariantDrag.cfg) to restore the Shielded/Clean options for the Terrier and Spark.</p>
<p>The new engines are trickier because there is no configuration mechanism for each combination of variant and shroud. With a bit of a hack (also in unvariantDrag.cfg) I get drag that feels right if I <br />1) specify each engine's areas A along the stack to match a disk that fills the cross-section with shroud attached, and<br />2) specify the Cd along the stack so that A×Cd is reasonable for the engine without shroud.</p> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1091962018-12-23T07:41:48ZAnonymous
<ul><li><strong>File</strong> <i>unvariantDrag.cfg</i> added</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1092392018-12-25T03:02:57ZAnonymous
<ul><li><strong>File</strong> deleted (<del><i>unvariantDrag.cfg</i></del>)</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1092402018-12-25T03:03:02ZAnonymous
<ul><li><strong>File</strong> deleted (<del><i>dragrace.craft</i></del>)</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1092412018-12-25T03:03:10ZAnonymous
<ul><li><strong>File</strong> deleted (<del><i>drag race.craft</i></del>)</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1092422018-12-25T03:05:08ZAnonymous
<ul><li><strong>File</strong> <a href="/attachments/40615/TerrierRace.craft">TerrierRace.craft</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/40615/TerrierRace.craft">TerrierRace.craft</a> added</li><li><strong>File</strong> <a href="/attachments/40616/TerrierRace.jpg">TerrierRace.jpg</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/40616/TerrierRace.jpg">TerrierRace.jpg</a> added</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1100452019-01-12T06:58:50ZAnonymous
<ul><li><strong>File</strong> <i>unvariantDrag.cfg</i> added</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1121582019-02-10T03:07:17ZAnonymous
<ul><li><strong>File</strong> deleted (<del><i>unvariantDrag.cfg</i></del>)</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1121592019-02-10T03:07:46ZAnonymous
<ul><li><strong>File</strong> <i>unvariantDrag.cfg</i> added</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1129212019-02-25T06:21:12ZAnonymous
<ul><li><strong>File</strong> deleted (<del><i>unvariantDrag.cfg</i></del>)</li></ul> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1129222019-02-25T06:22:17ZAnonymous
<ul><li><strong>File</strong> <a href="/attachments/43918/unvariantDrag.cfg">unvariantDrag.cfg</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/43918/unvariantDrag.cfg">unvariantDrag.cfg</a> added</li><li><strong>Subject</strong> changed from <i>engines with variants have shape for drag different from the visible shape</i> to <i>new engines have shape for drag different from the visible shape</i></li><li><strong>Description</strong> updated (<a title="View differences" href="/journals/112922/diff?detail_id=184810">diff</a>)</li></ul><p>The new Poodle, with the twin bells and truss mount, also has the problem of a default drag-cube from a hollow part failing to fill its space in KSPs aero model, between its neighbors in the stack. Adding its fix to the attached config.</p> Kerbal Space Program - Bug #20683: new engines have shape for drag different from the visible shapehttps://bugs.kerbalspaceprogram.com/issues/20683?journal_id=1490822020-07-06T05:53:44ZAnonymous
<ul><li><strong>Status</strong> changed from <i>New</i> to <i>Moot</i></li></ul><p>This is fixed in version 1.10.0<br />Probably changelog item<br />"* Fix drag cubes on J-90 Goliath, 48-7S Spark, LV-909 Terrier, RE-M3 Mainsail, RE-L10 Poodle RE-I5 Skipper, and numerous other parts." <br />refers to this fix.</p>
<p>Most of the engines patched in 'unvariantDrag.cfg' above, Spark Terrier Poodle Mastodon Cheetah Bobcat Skiff Wolfhound, will now fair the gap between matched-diameter cylindrical parts when their shrouds are connected to a lower part.</p>
<p>The Kodiak is still a special case with its choice of two diameters of shrouds. When its shroud is connected to a lower part in the stack, for aerodynamic purposes it acts like the smaller 1.25-meter diameter, so if you use the 'Shroud Big' variant of Kodiak and the drag bothers you, just disable the shroud going to the next stage in the stack.</p>