tag:blogger.com,1999:blog-6692958166761670904.post8326975679698461866..comments2023-03-04T11:03:25.464-06:00Comments on Universal Transport Systems: Ribbon Propellant Engine Injector PowerDavidhttp://www.blogger.com/profile/03631369308165105200noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-6692958166761670904.post-1571358106244584642009-05-21T14:17:30.242-05:002009-05-21T14:17:30.242-05:00Another note: Just for those that want to run the...Another note: Just for those that want to run the numbers, here are some (approximate) turbopump mass numbers:<br /><br />Redstone rocket: 4 kW/kg<br />Saturn F1 engine: 16 kW/kg<br />Space shuttle: 160 kW/kgDavidhttps://www.blogger.com/profile/03631369308165105200noreply@blogger.comtag:blogger.com,1999:blog-6692958166761670904.post-70396562234680802552009-04-29T17:03:00.000-05:002009-04-29T17:03:00.000-05:00Those are workable options - and if the going gets...Those are workable options - and if the going gets too tough, something like that would be a good fallback position.<br /><br />The main reasons we prefer ribbon are operational simplicity and safety.Davidhttps://www.blogger.com/profile/03631369308165105200noreply@blogger.comtag:blogger.com,1999:blog-6692958166761670904.post-22661684401480806682009-04-29T16:57:00.000-05:002009-04-29T16:57:00.000-05:00I quite like this concept in general - primarily d...I quite like this concept in general - primarily due to the dry mass and dry cost benefits. However I do not understand why one would want to trail the solid rocket fuel as a ribbon. I would expect problems with drag, ribbon dynamics, rocket exhaust impingement on the ribbon, and added "pumping" energy required to pull the ribbon "up" from beneath the rocket.<br /><br />Alternatively one might coil the ribbon in a slightly stuck together "cheese" on top of the motor - unwinding it from the top perhaps via a hole up the center. Or use many little propellant balls loosely held on top of the motor in a very light weight net. Perhaps with a semi automatic gun type pumping system.<br /><br />PeteAnonymoushttps://www.blogger.com/profile/05380207126034782269noreply@blogger.com