Orbitec had a video of their vortex rocket engine with a clear combustion chamber to demonstrate how cool the walls are kept. They apparently have taken the video of it down. On Fri, Sep 19, 2014 at 3:32 PM, Lloyd Droppers <lloyd.droppers@xxxxxxxxxxxx > wrote: > In various research projects for combustion and mixing clear windows > are often used, usually in conjunction with some sort of schlieren or > Raman spectroscopy set up. Below is a link to a quick summery paper > on one of the projects less than a decade ago. > > http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050169188.pdf > > Lloyd > > On Fri, Sep 19, 2014 at 1:19 PM, Lars Osborne <lars.osborne@xxxxxxxxx> > wrote: > > High speed video of a clear rocket engine made by rocketdyne in the 60's. > > > > http://youtu.be/QBV0DED7RYA?t=6m4s > > > > Has anyone made a clear liquid engine since? > > > > Thanks, > > Lars Osborne > >