I know nothing. But I've been following TU Delft's 50 km hybrid rocket project[1] recently. I noticed that they have an unusual (at least first I've seen of it) fuel. It's listed on their site as "a mixture of paraffin, sorbitol and aluminium" (N20 as oxidizer). So I guess it's kind of a sugar motor, sort of. :) [1] http://dare.tudelft.nl/stratos-ii/ -Nathan