Caught the news last night about a Kiwi Rocket Scientist developing and SUCCESSFULLY launching a SAM-sized rocket to 30,000 ft using a new type of rocket fuel - thixotropic - neither solid nor liquid, half-way inbetween.
Dang awesum!!!!
http://www.3news.co.nz/Kiwi-rocket-trials-new-form-of-propulsion/tabid/1160/articleID/276537/Default.aspx