dagabu Posted January 15, 2011 Posted January 15, 2011 Afterburners are fuel being dumped raw into the exhaust stream on military jets, we really have no way to reproduce this on a solid fuel rocket motor.i made this comparison as the fuel being pumped into the exhaust stream creates combusts creating enough heat that the air expands fast enough to create more thrust, if R candy burnt faster, it would be able to-theoreticaly-replicate this What you described is just solid fuel thrust, no matter how fast R-candy burns it will not recreate an afterburner. Perhaps you should do a little research on your concept as there is no fuel being pumped into the exhaust stream that has not already been part of the solid fuel grain. If you could find a novel way of delivering raw fuel into the exhaust stream AFTER the fuel grain then you would have a kind of afterburner. I have my FAA Airframes and Power Plant license since 1990 so I am pretty sure about this.
pillyg Posted January 15, 2011 Author Posted January 15, 2011 i am going to launch some today with a friend so i will film one. I will upload it onto youtube as soon as i can. Wow NAR and tripoli. Is making rockets even legal according to them? i mean making the fuel with the afterburner rocket, why not just do a hybrid rocket, that is kinda an afterburner depending where you add the oxidizer.
madmandotcom Posted January 15, 2011 Posted January 15, 2011 my mum has said i am only aloud to make solid fuel rockets =(
dagabu Posted January 15, 2011 Posted January 15, 2011 Is making rockets even legal according to them? NAR Model Rocket Safety Code Materials. I will use only lightweight, non-metal parts for the nose, body, and fins of my rocket.Motors. I will use only certified, commercially-made model rocket motors, and will not tamper with these motors or use them for any purposes except those recommended by the manufacturer.Ignition System. I will launch my rockets with an electrical launch system and electrical motor igniters. My launch system will have a safety interlock in series with the launch switch, and will use a launch switch that returns to the "off" position when released.Misfires. If my rocket does not launch when I press the button of my electrical launch system, I will remove the launcher's safety interlock or disconnect its battery, and will wait 60 seconds after the last launch attempt before allowing anyone to approach the rocket.Launch Safety. I will use a countdown before launch, and will ensure that everyone is paying attention and is a safe distance of at least 15 feet away when I launch rockets with D motors or smaller, and 30 feet when I launch larger rockets. If I am uncertain about the safety or stability of an untested rocket, I will check the stability before flight and will fly it only after warning spectators and clearing them away to a safe distance.Launcher. I will launch my rocket from a launch rod, tower, or rail that is pointed to within 30 degrees of the vertical to ensure that the rocket flies nearly straight up, and I will use a blast deflector to prevent the motor's exhaust from hitting the ground. To prevent accidental eye injury, I will place launchers so that the end of the launch rod is above eye level or will cap the end of the rod when it is not in use.Size. My model rocket will not weigh more than 1,500 grams (53 ounces) at liftoff and will not contain more than 125 grams (4.4 ounces) of propellant or 320 N-sec (71.9 pound-seconds) of total impulse.Flight Safety. I will not launch my rocket at targets, into clouds, or near airplanes, and will not put any flammable or explosive payload in my rocket.Launch Site. I will launch my rocket outdoors, in an open area at least as large as shown in the accompanying table, and in safe weather conditions with wind speeds no greater than 20 miles per hour. I will ensure that there is no dry grass close to the launch pad, and that the launch site does not present risk of grass fires.Recovery System. I will use a recovery system such as a streamer or parachute in my rocket so that it returns safely and undamaged and can be flown again, and I will use only flame-resistant or fireproof recovery system wadding in my rocket.Recovery Safety. I will not attempt to recover my rocket from power lines, tall trees, or other dangerous places.
nater Posted January 15, 2011 Posted January 15, 2011 Any motor comp made from scratch is in their "experimental" category, fuel type and motor size doesn't make a difference. I'm not positive, but I think Tripoli allows experimental rocketry while NAR doesn't. Your local rocketry club would know.
dagabu Posted January 15, 2011 Posted January 15, 2011 How extraordinarily boring. True, how about something exciting? Whatcha got?
TYRONEEZEKIEL Posted January 15, 2011 Posted January 15, 2011 Nater you are right. Tripoli launches will allow EX launches but only on a separate day than the commercial or sport propellant days. NAR only endorses Certified BP propellants and some mid-power APCP. NAR is geared toward model and sport rocketry while Tripoli is more centered around high power and amateur rocketry.
NightHawkInLight Posted January 15, 2011 Posted January 15, 2011 True, how about something exciting? Whatcha got?PGI, MPAG. Nater you are right. Tripoli launches will allow EX launches but only on a separate day than the commercial or sport propellant days. NAR only endorses Certified BP propellants and some mid-power APCP. NAR is geared toward model and sport rocketry while Tripoli is more centered around high power and amateur rocketry.I don't get it. Someone needs to go to one of their meets and let everyone know that they can do the same thing with the choice of adding a payload at any of the pyro clubs around. I can't imagine choosing to spend my time building the precision HP rockets of tripoli over the monsters fired at the PGI. You only can tell those big model rockets look pretty on the outside for the quarter of a second they sit on the stand, after that it's all fire, smoke, and a dot in the sky. You don't want your rocket to blow up, throw a parachute on it and bring it to an MPAG shoot. I would bet 95% of all the members of rocketry clubs in the world would also join a pyro club if given the choice and the knowledge of what they're missing. I understand that it's an entirely different field, I just don't understand what HP rocketry does for people that pyro couldn't do better. All those rocketry guys sure would bring a whole new level of precision and science into the mix that would be great to have around as well.
dagabu Posted January 16, 2011 Posted January 16, 2011 LOL! NHIL, we dant have to get waivers for launch heights, if the Tripoli guys came to PGI, I would bet you a buck that the limit would be 1000' on all rockets.
NightHawkInLight Posted January 16, 2011 Posted January 16, 2011 (edited) If Tripoli pulls waivers...We could too. I think it would be well worth the while if it doubled membership at the PGI. It may be a little discouragement to limit the building materials of the rockets to non metallic or shrapnel prone casings, but even so I think most of the rocketry guys would be very tempted to join up. You don't think so? Edited January 16, 2011 by NightHawkInLight
TYRONEEZEKIEL Posted January 16, 2011 Posted January 16, 2011 (edited) The thrill in our HP rocket clubs is putting rockets several miles in the air. What a boom and colors do for a pyro is what extreme power, some flame color, and height do for an HP rocketeer. For our launches we have to call the FAA and get waivers for flight ceilings of close to and not limited to 11,000 feet or so. Making stars for a pyro is making APCP for a rocketeer. Its awesome putting 2lbs of atomized ammonium perchlorate and probably another half pound of other goodies in a rocket and watching it burn out completely within 2 seconds, leaving something a few miles in the air, and being able to retrieve it. Granted I personally enjoy the low height and beauty of pyro, over the brute force of rockets. My dad is the rocket side of pyro, as I am the shells side, so I see both happen. My dad wants me to make some shells to put on an APCP rocket which he can use an altimeter to deploy the shell at a few thousand feet, rather than a few hundred. If anything, I wish the opposite and would prefer pyros to hold conventions with rocketeers. Imagine a pyro being able to utilize all of that ceiling. one shell could have effects that last a very long time. I know from skydiving that it takes about 40 seconds for a human to fall a bit over a mile. Imagine having some falling leaves shell or glitter that lasted a minute! If Tripoli pulls waivers...We could too. I think it would be well worth the while if it doubled membership at the PGI. It may be a little discouragement to limit the building materials of the rockets to non metallic or shrapnel prone casings, but even so I think most of the rocketry guys would be very tempted to join up. You don't think so?I dont, at least it would be a very hard line to cross.HP rocketeers cant do their thing without using metal cases for motors. The amount of pressure in these chambers are outrageous. unconfined APCP really doesnt do it. When put under pressure however, this stuff screams. Paper tubes even twice as thick would not do these monsters justice. Ive seen some of these formulas rupture the metal casings. Night Hawk, I would really encourage you to attend or look into an HP rocket event. Edited January 16, 2011 by TYRONEEZEKIEL
pillyg Posted January 16, 2011 Author Posted January 16, 2011 wow i missed a lot but o well. had a good day of launches. 3 good ones. here is a vid of the launch. the first one is plain KNO3/Sugar and the 2nd one is with iron fillings (i have thread about that) http://www.youtube.com/watch?v=gcsJWerUi68
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