californiapyro Posted October 4, 2011 Posted October 4, 2011 Hi! I've been into stingers lately, as I made a set of tooling for them. For some reason, they keep sticking to the launch post (rounded nail) when the core starts to burn. Does anyone know why this is, or how to fix it? http://www.youtube.com/watch?v=rnmpYQEkZAk thank you
Killerinc Posted October 4, 2011 Posted October 4, 2011 maybe your side hole is to big and not allowing enough upward thrust on the nozzle
Algenco Posted October 4, 2011 Posted October 4, 2011 rough spindle? or they aren't making enough vertical thrust
Mumbles Posted October 4, 2011 Posted October 4, 2011 From the video it looks like the rocket sticks to the spindle and stops spinning once the core lights. It clearly is able to freely spin during the start up phase. Is this a consistent problem or a one off issue? I personally had trouble with my stingers flying off in every direction it felt like. As recommended by Dan Williams, I found that a paper end plug with a hole punched in it worked wonders. Relatively frequently, the end plug would be left on the spindle itself, and could be reused. I found that the hole tended to enlarge after a few and made it a bit more wobbly. They're cheap so I didn't care, but some waterglass on the edge may help. http://fogoforum.us/stinger.php
californiapyro Posted October 5, 2011 Author Posted October 5, 2011 well about half and half, some leave the post and go arrow straight and others do this. They have plenty of thrust (here is an identical one that worked) although a hotter fuel I suppose could help.... mumbles please explain this paper end plug. http://www.youtube.com/californiapyro#p/u/16/mj8Gd8yHS5s (the last one was identical to the one in the first vid)
Algenco Posted October 5, 2011 Posted October 5, 2011 if they wobble they'll stick, I seen dolas do it quite often
Mumbles Posted October 5, 2011 Posted October 5, 2011 I just mean these things with a hole punched through them. It helps to slip them into a tube a few times to get them correctly sized. Just friction fit, and you have a guide. http://www.cannonfus...23&idcategory=9 By any chance are you drilling the stingers instead of using tooling? I had awful luck with trying to drill them out. I am talking about the core, not the side vent. If the core is not centered or exactly straight, the wobble is quite a bit worse.
allrocketspsl Posted October 5, 2011 Posted October 5, 2011 (edited) just noticed why the thrust isnt that instense on your spin,your tube is to thin mate thicker the tube better the stinger,Im making some now like my old ones,one pounders with 80 to 100 gram headers hopefully up sunday,put just a very slight upward to your vent hole just above the nozzel plug,I hand drill all mine I get better results,when yours lift off they are some of the best I have ever seen,ring of fire plus the jet looks nice,this is one of the few places I use feti for sparky stingers already told you on YT how to stop the sticking it works everytime Edited October 5, 2011 by allrocketspsl
californiapyro Posted October 6, 2011 Author Posted October 6, 2011 update: launched a couple tonight, have a whole array of tests planned based on your (and youtube's) suggestions. ran out of fuel so I have to make some up tomorrow, but here are the two I got done: this is from allrocketspsl's tip. maybe i didnt do it right? http://www.youtube.com/watch?v=hQqV6VO5yHE this is from a youtube tip, launched off a toothpick. it fell off prematurely then went into a tree. http://www.youtube.com/watch?v=_KsIaQoz1hU I was going to do mumbles' suggestion but my fuel cup was empty. oh well, tomorrow
allrocketspsl Posted October 6, 2011 Posted October 6, 2011 update: launched a couple tonight, have a whole array of tests planned based on your (and youtube's) suggestions. ran out of fuel so I have to make some up tomorrow, but here are the two I got done: this is from allrocketspsl's tip. maybe i didnt do it right? http://www.youtube.com/watch?v=hQqV6VO5yHE this is from a youtube tip, launched off a toothpick. it fell off prematurely then went into a tree. http://www.youtube.com/watch?v=_KsIaQoz1hU I was going to do mumbles' suggestion but my fuel cup was empty. oh well, tomorrow ok but i never said use a tooth pick use a nail mat 16 penny,you need the side vent hole adjusted thats all,it has to have a kick to get it spinning then the core takes it up your learning just like I did when you get it right youll know what I mean I must have made a hundred then WOW one after another,use all the tips people give you then use the ones your successful with,Sunday mines going up,great job.Best thing you did is join the WPA
Zingy Posted October 6, 2011 Posted October 6, 2011 Try using a lanch tube. The weight of the stiner will allow it to fall in the lanch tube once the visco is burned before reaching the propellant. A slot on the top of the lanch tube for the visco to slide in, will allow the singer further down the tube. Once perfected try lanching a flight of stingers, using fast visco or sticky match. Discharged 500g, cakes are very convenient, as ready made flight sets for stingers. Trying some whistle mix before the delay mixture. The singers must then be pressed, with all the whistle mix precautions. Never drill into the whistle mix. First try a benzoate whistle mix, as it is less energetic.
Mumbles Posted October 7, 2011 Posted October 7, 2011 He very clearly said that the tooth pick thing was a you tube suggestion.
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