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#1
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![]() Hey Folks!
My club has a great launch system that we purchased last year. We had been using a car battery with it but it needs to be replaced. The system is a relay-type with 10 Low-Medium Power pads and 10 High Power pads. We only use about 4 Low-Med pads currently but we do launch up to G engines and some clusters. We also have the occasional drag race. My question is: What do I look for in a replacement battery? I can get a cheaper, small lawn and garden battery with 250 cold-cranking amps, a regular car battery with 500 CCA, or a battery with 710 CCA. Any recommendations? Thanks!
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Chris Halinaty My Flight Statistics for the Past Year
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#2
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![]() Spend the extra $ and get a sealed battery. Then you won't have to worry about acid leakage if it turns over and as it charges. Amperage is your friend, so get a battery with capacity to spare. Keep it trickle charged between launches, and it should last a long time. Interstate and Duracell make great sealed batteries. You can get Duracell sealed batteries at Sam's. You want reliability and safety.
Allen |
#3
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![]() To give you an idea, a little 7Ah gel cell (sealed lead acid) will fire off a large cluster with solar igniters easily. I've routinely done 4 and 5 engine clusters with solars, and I used to do crappy copperheads and tiger tails with 100% reliability. In other words, you don't need 250 cold cranking amps much less a 710 cca car battery assuming your system uses relays and you aren't running ignition current 500 ft to an away cell and you pay a little bit of attention to igniter installation.
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I love sanding. ![]() |
#4
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![]() Oregon Rocketry uses, for its low-power launch system, an emergency car battery charging system.
I bought a a near-identical model for myself, at Harbor Freight. It cost about $40. The unit has a handle, a very sturdy plastic case, a meter, an emergency light (for changing tires or other repairs), and two heavy-duty battery clips. It charges overnight with AC. I've never, ever seen a case where it runs out of "juice" during a launch. There have been cases where I forgot to charge the unit, and it maintains enough charge from the previous month to run a launch. (Say, 50 - 75 launches.) These units are certainly larger than a small sealed battery, but they have multiple uses and are readilby available.
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NAR #27085 - Oregon Rocketry - SAM |
#5
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![]() ...and they contain a small sealed lead-acid battery about the size of the one tbzep mentions.
I fly with a couple of clubs who use these jump starter devices to power their launch systems and their PAs.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#6
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![]() Quote:
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Paul If we weren't all crazy, we would go insane - Jimmy Buffett NAR #87246 www.wooshrocketry.org |
#7
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![]() I use a jump-starter box to launch as well. It contains a 7.2Ah 12V Gel Cell.
Same battery for use in my R/C glow-engine flight/starter box as well. Will fire hundreds of rocket igniters on a single charge.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
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