jaysgoh Posted March 16, 2013 Share Posted March 16, 2013 (edited) I going to fire my rocket tomorrow at my RC flying field .Total Weight : 69gramFlash Powder : 0.5gramCrush dragon egg starts : 1 pcsFuel Ratios : 65 : 35Total Length : 8cm / sticks ading a role tube sticks its become 90g . Edited March 16, 2013 by gohjiejing Link to comment Share on other sites More sharing options...
Zumber Posted March 16, 2013 Share Posted March 16, 2013 good luck..!!And dont forget to share video with us. Link to comment Share on other sites More sharing options...
jaysgoh Posted March 16, 2013 Author Share Posted March 16, 2013 thanks bro ! i will do but i can say that i got no proper sticks . it head heavy . either not fly or slam down to the floor . Link to comment Share on other sites More sharing options...
leedrill Posted March 16, 2013 Share Posted March 16, 2013 looks good though {fly baby fly }hope you have some success Link to comment Share on other sites More sharing options...
jaysgoh Posted March 16, 2013 Author Share Posted March 16, 2013 it will fly but i dont think so it straight . thanks ! Link to comment Share on other sites More sharing options...
jaysgoh Posted March 17, 2013 Author Share Posted March 17, 2013 FAILED !!!! FUEL TOO SLOW ! I dont know why its seems like stop and like farting . fuel like smoke bomb , just bomb . nothing gonna fly ! anyone can guide me ? Link to comment Share on other sites More sharing options...
pyroshell Posted March 17, 2013 Share Posted March 17, 2013 it kind of just bubble at the nozzle?If it left heavy residues that are thick and white to off white yellow it could mean that you have too much fuel. What composition are you using?Do you have video?If not I would recommend making a rocket engine with the same methods as before and doing a static test.If you do this static test you should videotape it so others can try to help you better. Link to comment Share on other sites More sharing options...
jaysgoh Posted March 17, 2013 Author Share Posted March 17, 2013 i got no video .. sorry ..white bubble .. i using dry mix . 65;35 kno3 and icing sugar ... Link to comment Share on other sites More sharing options...
leedrill Posted March 17, 2013 Share Posted March 17, 2013 the only problems ive had with a mix like this dry powders is if i mill it for longer than 5 minutes i will almost guarantee a cato but i say this from my experience before i had a press but if i mill that kind of mix for extended periods i did tests on 50g batches of that and my bp and without high speed footage is hard to tell the difference burns very hot how are you making your nozzles Link to comment Share on other sites More sharing options...
jaysgoh Posted March 17, 2013 Author Share Posted March 17, 2013 drill hole by using drill bit . i dont understand , should i drill all the way until the end or just half ? Link to comment Share on other sites More sharing options...
pyroshell Posted March 17, 2013 Share Posted March 17, 2013 It's called a cored rocket.It increases you surface area allowing more fuel to light at once therefore you get more thrust.I never have drilled out a cored rocket I always have used rocket tooling set that had a mandrel. This way the core is formed while you press/ram you engine.It also reduces the risk of ignition during the process of making the engine, but if you absolutely have to drill out the core for you rocket engine do not use an electric drill do it by hand.Also since you asked I will tell you, the core in a rocket engine will typically go anywhere between 1/3 to 2/3 of the way into the engine.I am not very well versed on sugar rockets, but I would suggest a core that goes about ½ way into the engine.Just experiment a little and do some static test's. Link to comment Share on other sites More sharing options...
BlastFromThePast Posted March 17, 2013 Share Posted March 17, 2013 What's the ID of you're tube? and thickness of tube walls? Link to comment Share on other sites More sharing options...
jaysgoh Posted March 18, 2013 Author Share Posted March 18, 2013 ID is 0.6-7cmthickness of tube wall are 0.4cm . unfortunaly the wall dint burn .. i guess it was the core length too short . Link to comment Share on other sites More sharing options...
engralihaider Posted March 29, 2013 Share Posted March 29, 2013 had u cheked the fuel burn rate before putting it in mold or tube ??? Link to comment Share on other sites More sharing options...
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