'''1.9KS2150''' adalah sebuah [[mesin roket]] propelan padat yang dirancang oleh RPI dan digunakan dalam beberapa tahapan Cajun Dart, Deacon dan roket Loki. Mesin itu digunakan dalam setidaknya 617 peluncuran.<ref>{{cite web| last = Wade| first = Mark| authorlink = | coauthors = | title = 1.9KS2150| work = | publisher = | year = 2008| url = http://www.astronautix.com/engines/19ks2150.htm| doi = | accessdate = 2010-03-14| archiveurl = httphttps://web.archive.org/web/20090101211159/http://www.astronautix.com/engines/19ks2150.htm| archivedate = January 1, 2009-01-01| deadurl = yes}}</ref><ref>{{cite web| last = Wade| first = Mark| authorlink = | coauthors = | title = Judi| work = | publisher = | year = 2008| url = http://www.astronautix.com/stages/judi.htm| doi = | accessdate = 2010-03-14| archiveurl = httphttps://web.archive.org/web/20081229221539/http://www.astronautix.com/stages/judi.htm| archivedate = December 29, 2008-12-29| deadurl = yes}}</ref><ref>{{cite web | last = McDowell| first = Jonathan| authorlink = http://planet4589.org/jcm/jmcdowell.html| coauthors = | title = Stages| work = | publisher = | date = February 2007| url = http://www.planet4589.org/space/lvdb/sdb/Stages| doi = | accessdate = 2010-03-14}}</ref>
