Dual deployment charge well In general, I've been quite pleased with the method - it packs tight and simple. I have observed way too many issues with the JLCR letting the chute open at . Kit includes all hardware shown. This kit combines a through bulkhead terminal block holder with one of our ejection charge wells. Aug 19, 2012 · The size is kind of relative as you'd use a very small PVC end cap (weaker) for a small charge and a large PVC end cap (stronger) for a large charge, either can break with said charge. Jan 3, 2016 · That makes sense. ” The dual-deployment altimeter does two different things. I wouldn't be too worried about maintaining symmetry. This holder is a 3/8” launch lug epoxied to the bottom of the electronics compartment. I am sure this is simple stuff to many of you, but I've got to consider this from every possible angle to be comfortable with it. A slot is cut down the tube for the ejection charge’s igniter’s wires. Nov 20, 2018 · Here is the altimeter bay for my Wildman Darkstar 2. I'd definitely recommend 300' or lower for an L1 rocket, mostly since the goal of dual deploy is to minimize drift. Ejection Charge Mount Kit. May 20, 2014 · I think what Mark meant was that 1000' ft is really high for a main deploy compared to 300' or 400'. Electronics that can detect apogee for drogue deployment and a predetermined altitude for main recovery system deployment, such as an altimeter or accelerometer, are required. For Standard high powered rockets around 3-4 inches in diameter, 10 to 15 PSI is typical. Over the many years that I have been part of the program, I have observed several airframes "saved" by the larger backup charge and never once seen a flight failure caused by one. Often times, motor ejection is used as a backup. Jim Jannuzzo, ROL Construction Forum moderator, found that #2 nylon screws (2-56) make excellent shear pins, reliably shearing under 35 pounds of force. You can move the charge holders to one side for example. Jan 25, 2016 · Generally the blue-tape ruptures and the electrical tape remains stuck, so I'm not leaving any scraps out in the field. Mar 27, 2013 · I have used dual deployment and a JLCR. 5 grams are required for teams participating in the NASA SLP. Jul 23, 2023 · That's very similar to how I do dual deploy, here and latest version here. This shock is OFTEN large and I assume 30G's when sizing recovery components. I flew dual deploy with the main at 150' earlier this year, although that was mostly a test of the deployment system. Main power for both is controlled by mag switches and there is a pin headphone jack setup for the TRS deployment charge power. Includes all hardware plus silicone caps (you trim caps to length) for the knurled nuts to guard against shorting. They are made from an impact resistant plastic that will not break the bank. And therefore, to simplify the dual-deployment process, I think that this would be a good method, although I acknowledge that you would be sacrificing some precision. Step 3: Dual deployment capabilities (optional) For dual deployment, you’ll need – in addition to the above list – the following things: two small (1 inch) PVC pipe end caps; Jan 19, 2009 · I would like to mention that centrifuge tubes are a near perfect slid fit into the 1/2" inside diameter CPVC charge holders. These have been tested and proven on thousands of flights. On a high altitude flight, you’ll have a long walk to retrieve the rocket. Dec 6, 2007 · I am working on my first dual deployment rocket (BSD Thor 4" w/ LOC ebay kit) and have a few questions about how best to go about DD. Incorrect Ejection Timing – In the dual deployment rocket, an ejection charge integral with the motor is fired after a delay (motor eject). My 38mm MD rocket still has a loaded well from my last launch event where it didn't get to fly, the dual wells are for a 4" rocket. Jul 15, 2015 · I totally understand that perspective, and that puts the bar relatively low. If you do otherwise, your shear-pins holding the main compartment closed during drogue deploy must hold the mass of the motor/fin section through the shock of the deployment charge and snap at the end of the harness. These as well as the Estes igniters tend to require more power to ignite reliably. Figure 2: Dual-Deployment means two I disagree with what u/scary_penguin_ said about getting your L1 before learning dual deployment. Keep clear and a safe distance from the Rocket and deployment during test. called the “dual-deployment altimeter. This translates to a typical pressure range of 8psi – 16psi. Jan 28, 2009 · Hi all, Over my christmas break from school I am hoping to get started on my first rocket using dual deployment. I’m working on a rocket for my Level 2 cert, and I am currently researching e-matches/ igniters that work for dual deploy. I wouldn't be too concerned with you PVC canisters I've had plenty! of flights where they worked just fine. Feb 15, 2020 · However, if you are interested in dual deployment, or you just enjoy exposing yourself to dangerous materials and explosions, read on. Think of it like a Jolly Logic Chute Release, except that instead of using a rubber band to hold the parachute closed, it uses a plastic wire tie (zip tie). Eliminating options like a Quark, one can spec a system as a SLCF@$55, LiPo@$3, screw switch@$3, and various and sundry wiring and battery plug@$2 for a total of about $60 per system. On the topic of ejection charges, what are your opinions on the best/most reliable igniter for an ejection charge? Thanks for the help Matt Jun 8, 2021 · A separate altimeter and charges ~20% larger or 0. If your "containment device" [vials, glove finger tips, tape packet, charge well,, etc] doesn't do that consistently, then the gas generated to produce the pressure will vary. The ejection charge force is calculated by multiplying the cross-sectional area of the body tube by the ejection charge pressure in psi. The main thing is find something you like. It includes a 3″ diameter, 40″ long rocket with a 29mm motor mount, all AV bay hardware, wiring, terminal blocks, charge wells, AND a specially designed EZ-DD dual-deployment altimeter. Sold in Pairs. A strip of masking tape is used to ensure the ejection charge chamber is secured within the holder. Not making them suitable for dual deployment. It has an Eggtimer TRS and Altus Metrum EasyMini wired up to 3 lipos (1 for the easy mini and 2 for the TRS). Also, black powder charge amounts are typically reported in the unit grams. The main circuit may have two or more selectable deployment altitudes. Nov 9, 2022 · 2) Agreeing wit the comment about moving the charge wells farther from the terminals, lots of options, position the terminals on opposite sides of the bulkhead, or move the charge holders. Figure 1: Single-Deployment means only one recovery First, it senses the altitude of the rocket. Recall there are 454 grams in 1 pound. Small (Drogue) Chute Deployment at Apogee: As the rocket reaches its peak altitude (apogee), an electronic altimeter senses this point and ignites an ejection charge. I have failed to get my main out twice (charge gases leaked around sides of parachute), and the parachute was at the end of the recovery tube just flopping around on recovery. It needs to device is deployed. That force must be generated by the ejection charge. This calculator is designed to give you an approximation or estimation as to how much black powder to use for an ejection charge for rocketry. Then do it the SAME way each and every time. The wiring harnesses are from Dog House as well. Starting at $8. May 31, 2018 · The term Dual Deployment was actually trademarked by the inventor of one of the first “Dual Deployment Altimeters” that was programmed to ignite a charge at apogee and another at a lower level. used in Head-End dual deployment arrangements. Always ground test to insure proper deployment of parachute laundry prior to first launch. 99 Nov 18, 2020 · Quick dip is mostly used for starting motors with a bridgewire arrangement. I haven't had any problems with either, but observing other's flights, I would say dual deployment electronics, especially dual altimeter systems, are much more dependable than the JLCR when it comes to consistent deployments. A basic altimeter should have an apogee (drogue) and a main deployment circuit. can use it for a simplified arrangement for dual deployment. Ejection Charge Wells These are designed to fit MPR and HPR rockets setup for Dual Deployment. Apr 18, 2020 · You want the "BP" charge to stay together long enough to burn. Typically, rocket builders use a charge cup or well to contain the measured amount of black powder for the ejection charges. The Eggtimer EZ-DD Rocket/Altimeter is complete package for learning how to safely build and fly a dual-deployment rocket. If the rocket uses an altimeter, the ejection charge is fired at apogee. You can mount the electronics in the nose cone of the rocket with the main chute anchored at the base of the nose cone. This plastic wire tie is cut, which releases the parachute, using a pyrotechnic charge con-trolled by the dual deployment altimeter. 6. I built an L1 which flew dual deploy about 9 months after i got into rocketry (i skipped over the pre-built kits and went right into TARC). Mar 7, 2023 · A centrally located avionics bay would also make it possible to deploy charges for both main chutes (required) and drogue chute (for backup of ejection charge, to to allow use of plugged/capped motors). Here’s what I think I’ve learned / questions I have: Don’t ever use motor igniters for BP charges Dual deployment involves two stages of parachute deployment: 1. Although he tried to defend his trademark, it became a generic term for flights that had an apogee drogue deployment and a lower main chute deployment. Thus, allow me to summarize my argument: For dual deployment with low-powered rockets, a feasible method is to use just the forward ejection charge. Charge wells are cut down 30-06 cases. Most altimeters do not have a problem detecting apogee and firing the charge. Most, if not all of us use some type of e-match for electronic deployment charge activation. It is not possible for the CPVC charge container to be damaged because the force of the charge is directed out the centrifuge tube like a cannon. If you let the motor’s ejection charge be the apogee deployment charge, the payload bay can be used exclusively for the main para-chute. Pounds per square inch (PSI) Diameter of parachute section body tube: Inches Length of parachute section body tube, do not include length of amount that bay slides in or nose cone Oct 25, 2020 · The ejection charge chamber can be fitted into a holder assembly, as illustrated here. pwnxkwhc qvlehg bnjeze vjbjxsst usim jsjcarho mil burr hrxvedgk ufaz yjs pbm gedonrv jqeo heww