Aquarius Posted September 12, 2007 Posted September 12, 2007 Willowmp, have a look at Nakka or James Yawns websites, they are quite useful if you are to build your own test rig.
willowmp Posted September 13, 2007 Posted September 13, 2007 ok thanks a lot aquarius my teacher wanted to know how i was guna test it lol now i have one. thanks
Paaskonijn Posted September 15, 2007 Posted September 15, 2007 Hi Guys, I got a nasty problem, i aint got a ballmill so i get my MP from a friend. But now i have my new rocket tools from Aluminium, its so easy to make a rocket, the problem is, my rockets are just so fucking fast. HUGE liftoff but then it just explodes on like 4/5 meters high. My parents like it, but i dislike this shit.Its really driving me insane, last week my rockets were so slow allmost no liftoff and only reached 10 meters. But if i see the power of this liftoff i think it will reach 150 meters high. So im really wondering how to fix this problem. My english is not too good...Sorry for that. Rico
pudidotdk Posted September 15, 2007 Posted September 15, 2007 So your problem is delay?That's what delay powder is for, it's generally a slow type of BP, rammed on top of the rocket, so once the rocket has burned up, the delay makes sure the rocket won't give the report too fast, as your does. Tigertail is an option for delay: 44% KNO344% Charcoal6% Sulfur6 Dextrin
Pretty green flame Posted September 15, 2007 Posted September 15, 2007 Also, you can ram a glitter comp above the spindle, this shall give you a nice glittery tail and a good delay before the shell blows.
LGM Posted September 15, 2007 Posted September 15, 2007 Are you using a core? How fast is the powder? Try making your own powder in a mortar and pestle, that way it is quicker and you can experiment with smaller batches.
Paaskonijn Posted September 16, 2007 Posted September 16, 2007 Nope, im still testing out so no payload on the rocket.My core is 4.5 mm, i use PVC with a 16 mm ID,2 cm core. But thx i will do some experiments with other types of Meal Powder. Rico.
Pretty green flame Posted September 16, 2007 Posted September 16, 2007 Here are two of my rockets that i'm going to fire this evening. http://i15.photobucket.com/albums/a374/AVP2/Rocketheads.jpg Do not be mistaken, they are fake headers the total weights of the headers are 141.15g and 142.70g so i'm testing these rockets to their very limits. I hope they fly well, my aim is to achieve 50-60m with these which should be a nice height for some close proximity fireworks Cheers
Pretty green flame Posted September 16, 2007 Posted September 16, 2007 Excuse the double post but here are the results of the test. 1st Rocket: 70:20:10 ball milled for 25 minutes with 5% charcoal added (Commercial hardwood or Airfloat for the americans ) End plug made from unmilled kitty litter Video: http://www.youtube.com/watch?v=Lhf9QFDClYw 2nd Rocket: 70:20:10 ball milled for 25 minutes with 10% charcoal added (Commercial hardwood ar Airfloat for the americans ) End plug made from unmilled kitty litter Video: http://www.youtube.com/watch?v=Cv_2eVkHbAU Both had a ~140g dummy header attached. If anyone wants the specs for the tooling, PM me. Cheers
deadman Posted September 16, 2007 Posted September 16, 2007 Awesome rockets! Is it just me or were you aweful close to the jet from the rocket? http://www.apcforum.net/files/closecall.JPG
frogy Posted September 17, 2007 Posted September 17, 2007 Hehe I noticed that also... At least he got very far away from the CATO... It does look like he got decently far away from that jet though... Probably felt the heat
Pretty green flame Posted September 17, 2007 Posted September 17, 2007 Was about 15 feet away, the camera makes it look so close.
mormanman Posted September 20, 2007 Posted September 20, 2007 Ok. So I tried to make a black powder rocket say 2 inches by .25 inch and made a nozzleless one and a nozzled one (the nozzle was pretty big). So I tested them and nothing. I don't know what I did wrong. By the way these were my first and they sucked.
deadman Posted September 21, 2007 Posted September 21, 2007 What do you mean by nothing? No thrust? Or the fuel didn't recieve fire? As always, Mormanman, be more specific.
moonshot Posted September 21, 2007 Posted September 21, 2007 Rocket and Roll Green Flame! You must be making some fast BP because that first CATO was LOUD! The second rocket flew great and it was fast. That is still right on the edge. Looks like you found the right propellant mix. Now you can fill those fat cannister headers with some sweet pyro effects. I just rammed up two motors for cannister shell rockets. 5" long 5/8" ID core burners with 6mm nozzles. http://i107.photobucket.com/albums/m314/dickwad_07/Picture132.jpg I use a putty and water mix to make my end plugs so I got the idea of using pieces of plastic straws embedded in the putty to pipe fire to the center of the shell header like they do in aerial shells. Hope it works. Anyhow it's good to see your getting your rockets dialed in.WARNING! Do not do this! I fired one of these with a 100 gram header thinking it would make a better break but what it did was cause a long delay that made the rocket come down and hit the ground and then go off! So much for a seemingly good idea. I will post the embarrassing video when the trauma wears off IE It landed in my neighbors yard! It was truly an OMFG moment.
frogy Posted September 21, 2007 Posted September 21, 2007 Ahh... thats a great idea to put that plastic straw to the center of the shell... It will be hard to do with a plastic shell that has a 1/8" visco hole though... hot gluing it in a 3" or greater plastic shell that has a time fuse hole should work great... Also paper shells... Also I have a question... Is hot gluing the lift cup directly to a 1.75" shell a bad idea? I glued a plastic shell with 10 grams of FP in it to my lift cone and it didn't lift at all... Lets just say I'm down a 1.75" mortar that I just got in the mail, and that my blast wall is missing a few bricks... I wasn't in any danger, but now I know what HDPE does when it breaks... it tears apart... a lot I'll be using the 1.75" shells for rocket headers or something I guess, or wait until I find a cardboard mortar at New Years... My paper lift cone was filled practically to the brim with 4g of ~20mesh lift... which can definitely lift it (10g got a 50g comet up fast) With "larger" shells, 2", 2.5", and 3" I'm just going to place the lift in a dixie cup with a lift bag at the bottom... so I don't really know why I'm asking this about 1.75" shells if I'm not going to use them anymore just knowledge
psyco_1322 Posted September 21, 2007 Posted September 21, 2007 Nope I do it all the time, just cut out a lift cup from whatever your using and hot glue it right to the bottom of the shell. It will more than likely get blown off but that not a problem after the shell fires.
deadman Posted September 21, 2007 Posted September 21, 2007 Yeah, Frogy the problem probably wasn't in the lift. Your shell just recieved fire when it shouldn't have. Maybe your fuse/spollete broke free just enough to light the flash. So.... what does a HDPE firecracker sound like?
frogy Posted September 21, 2007 Posted September 21, 2007 My lift definitely went off before it exploded... I tried a effect shell and if you watch the video you can see the lift go off and the shell stays in the tube or just barely got out... not really sure... I thought the quickmatch might have blocked the shell so I made another that had the fuse going straight down out of the lift cup, the lift goes off, and then about 2.5 seconds later (what I was aiming to time it to) I lost a mortar... P.S. HDPE firecracker is very loud... the pipe shot upto 50 feet away and even knocked down some of my brick barrier (just loose bricks, but still heavy)... It probably wasn't much louder than a regular 10 gram perchlorate flash salute, but it was loud...
mormanman Posted September 21, 2007 Posted September 21, 2007 What do you mean by nothing? No thrust? Or the fuel didn't recieve fire? As always, Mormanman, be more specific. No thrust. Sorry I'll try to be more specific.
WarezWally Posted September 22, 2007 Posted September 22, 2007 Its about time that i registered here I'm awaiting some 15mm (8oz) tooling from supremepyro, does anyone have any basic data as to the lift/height ratios that one can roughly expect? Looking forward to some consistent results - no more dodgy hand drilled nozzles and cores Thats one of my fastest hand made core burners
moonshot Posted September 23, 2007 Posted September 23, 2007 Its about time that i registered here I'm awaiting some 15mm (8oz) tooling from supremepyro, does anyone have any basic data as to the lift/height ratios that one can roughly expect? Looking forward to some consistent results - no more dodgy hand drilled nozzles and cores Thats one of my fastest hand made core burners Welcome to the Forum Wally. I'm currently ramming 15mm ID 130mm long rocket motors that easily lift 65 to 75 gram headers 200- 250 feet maybe more. (pics in the previous post on this page). I'm pushing the envelope on my latest rockets by going to a 100 gram header. http://i107.photobucket.com/albums/m314/di.../Picture133.jpgThis one is loaded with stars and burst powder from a couple 1.4g shells I cut open, plus the last of my TT stars and some yellow leaf fuse. I call it Flaming Jamboree . Your tooling is going to make building rockets much easier than having to ram a solid motor and drill a core. Keep us posted on your progress and post pics and vids of your rockets. I'm going to get a vid of my latest one and post it. Be safe.
frogy Posted September 23, 2007 Posted September 23, 2007 I made some 3/8" rocket tooling today out of 3/8" dowel and a scrap piece of 2x4" wood for the spindle... Took me like hours of "lathing" on an electric drill hehe.... I made some 3/8" by 3" rockets with 1.75" plastic shell headers and they got to about 30 feet before catoing... but the shell got to about 50 feet... I made the spindle 2" after the offset instead of 2" including the offset, so I'm going to have to adjust that tomorrow... 60:30:10 white pine for 3 hours looks beautiful... it's actually pretty fast for a 6:3:1 mix...
moonshot Posted December 11, 2007 Posted December 11, 2007 So after the last disastrous launch of my latest cannister head rocket that landed in my neighbors yard about 15 feet from his front door and went off with a thunderous boom and astounding flash. I swore I was going to burn all my supplies and quit this hobby. But alas I have truly "Smelt The Smoke" and am back to building skyrockets. Here is a pic of three of my latest.http://i107.photobucket.com/albums/m314/dickwad_07/Picture140.jpgfrom left to right . 75 gram cone cup header filled with stars and burst from two 1.4 g shells and cut TT stars. Center is a 100 gram cone cup header with 1.4g stuff and some aluminum/meal pumped stars. And last is another 100 gram cannister head with pumped Fe/meal stars and flying fish fuse. These are all built on my 5" long 5/8" ID core burner with a 5mm nozzle. Needless to say my idea of using the piece of soda straw in the end plug of my rocket motor was the reason for the failure of my last rocket launch so I have gone back to the standard pass fire hole in the end plug. By the way if you ever wondered what was in one of those 1.4g shells here it is.http://i107.photobucket.com/albums/m314/dickwad_07/Picture138.jpgSome purist may frown on this as cheating but it's the easiest way I have of obtaining colored stars. Anyway I hope to have some vids of Successful rocket launches soon. Everybody have another safe and happy pyro christmas!
NightHawkInLight Posted December 11, 2007 Posted December 11, 2007 They look great! I hope to see the videos. I will be watching for the video of that can in particular, it seems like not many around here make anything other than balls except for special purposes.
Recommended Posts