THEONE Posted April 7, 2011 Share Posted April 7, 2011 It is possible to make a rocket fuel without sugar, like rcandy, so it will not be hygroscopic... ? Link to comment Share on other sites More sharing options...
Ralph Posted April 7, 2011 Share Posted April 7, 2011 It is possible to make a rocket fuel without sugar, like rcandy, so it will not be hygroscopic... ? Sure can its called black powder you may also wish to experiment with lactose (I know its not hydroscopic as to how much power youll get with it I cant say) Link to comment Share on other sites More sharing options...
THEONE Posted April 7, 2011 Author Share Posted April 7, 2011 Sure can its called black powder Yes but you cant make grains with BP Link to comment Share on other sites More sharing options...
Ralph Posted April 7, 2011 Share Posted April 7, 2011 Yes but you cant make grains with BPyou sure can Ive been flying bp rockets for years and years Link to comment Share on other sites More sharing options...
THEONE Posted April 7, 2011 Author Share Posted April 7, 2011 (edited) you sure can Ive been flying bp rockets for years and years I mean grains by the melting process... not by ramming... I am thinking to add BP and lactose to make a solid black powder propellant But i think that lactose is lightly hygroscopic...I saw that xylitol-erythritol isnt hygroscopic but i dont know if i can find.... Edited April 7, 2011 by THEONE Link to comment Share on other sites More sharing options...
Ralph Posted April 7, 2011 Share Posted April 7, 2011 I mean grains by the melting process... not by ramming... I am thinking to add BP and lactose to make a solid black powder propellant But i think that lactose is lightly hygroscopic...I saw that xylitol-erythritol isnt hygroscopic but i dont know if i can find.... Black powder rockets give much better results than candy ones generally you should totally look into switching over slightly is much better than very Link to comment Share on other sites More sharing options...
azure Posted April 7, 2011 Share Posted April 7, 2011 The specific impulse of rocket candy is much higher then that of black powder but black powder is more fun Link to comment Share on other sites More sharing options...
dagabu Posted April 7, 2011 Share Posted April 7, 2011 I use R-candy for daylight rockets, most with parachute recovery, I dont use black powder for that and I dont use R-candy at night. Each has its own place but BP has my heart! Link to comment Share on other sites More sharing options...
madmandotcom Posted April 9, 2011 Share Posted April 9, 2011 actually, the kno3 is hygroscopic so bp will also have some hygroscopic properties Link to comment Share on other sites More sharing options...
Mumbles Posted April 9, 2011 Share Posted April 9, 2011 Clean KNO3 is not hygroscopic. Link to comment Share on other sites More sharing options...
dagabu Posted April 9, 2011 Share Posted April 9, 2011 actually, the kno3 is hygroscopic so bp will also have some hygroscopic properties Bugger me! You are just a treat you are! Link to comment Share on other sites More sharing options...
madmandotcom Posted April 10, 2011 Share Posted April 10, 2011 Clean KNO3 is not hygroscopic. how do you mean clean? if you are meaning pure, i found that even my 99% pure stuff clumped when i forgot to close it one night Link to comment Share on other sites More sharing options...
Mumbles Posted April 10, 2011 Share Posted April 10, 2011 Clumping is not necessarily an indication of a compound being hygroscopic. It's also impossible that the other claimed 1% could be a very hygroscopic substance like sodium nitrate or calcium nitrate. Link to comment Share on other sites More sharing options...
THEONE Posted April 10, 2011 Author Share Posted April 10, 2011 It is possible to make an non-hygroscopic rcandy ? Link to comment Share on other sites More sharing options...
dagabu Posted April 10, 2011 Share Posted April 10, 2011 No, as long as sugar is used, it will dissolve. The best thing you can do is wax dip the grains right after casting them. Link to comment Share on other sites More sharing options...
THEONE Posted April 11, 2011 Author Share Posted April 11, 2011 No, as long as sugar is used, it will dissolve. The best thing you can do is wax dip the grains right after casting them. What is wax dip Link to comment Share on other sites More sharing options...
dagabu Posted April 11, 2011 Share Posted April 11, 2011 (edited) You can melt a candle in a double boiler and dip the fuel grain in the melted wax. This picture shows some grains that are wrapped in paper to inhibit the flame, the core and ends are open to the flame. http://www.google.com/url?source=imgres&ct=img&q=http://www.trailertrashaerospace.com/images/grains.jpg&sa=X&ei=71SjTfutBoiitgfNrvCTAw&ved=0CAQQ8wc4hgE&usg=AFQjCNGCkFmNuDt-2M-Tl6uVZ_nJcvYSTA Edited April 11, 2011 by dagabu Link to comment Share on other sites More sharing options...
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