05-29-2017, 01:27 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Quote:
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Originally Posted by Rick M
Someone donated some B14-0 motors to me (he heard that I give Estes motors away to kids at rocket events) and thought I'd do some researching on them.
My understanding is that black powder has an Isp of 80 and the sugar motors I make 125-140 depending on what pressure I run them.
Here's one of the last sugar motors I tested:
https://www.youtube.com/watch?v=eeOVhQKnTfg&t=0s |
Hermann Oberth would be so proud! (It also reminds me of the Aerojet 260" diameter solid motor tests.) The Kegeldüse ("cone") liquid propellant rocket engine that he static fired in that position was probably only a fraction as powerful as yours. Do all of your sugar motors build up thrust slowly like that? (I imagine it could have been the grain configuration instead, as the little "Five Cent Sugar Rockets" seem to zip up and away rapidly.) B14s were prized for their quick, "kick-in-the-pants" liftoffs. If you can duplicate--or exceed--their performance with a sugar propellant, probably a lot of people would happily "roll their own" sugar B14s if you sold a "How-To" pamphlet with the 'recipe.' |