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Model Forum / General / Rockets / June 2005[FFT] Dual chute question
For no reason other than just doing it, I would like to recover an LMR on dual chutes. I think everyone has seen something coming down on two chutes which form a "V" pattern above their payload. How are the chutes made to generate the horizontal force in this configuration? Are the shroud lines different lengths? Any tips or advice on how to do this with typical flat chutes? TIA  SignatureGary Bolles summum jus, summa injuria est To contact me; bollesg at comcast dot net http://home.comcast.net/~bollesg/rockets/rockets.html Help make r.m.r. a No Flame Zone > For no reason other than just doing it, I would like to recover > an LMR on dual chutes. [quoted text clipped - 8 lines] > > TIA Run a nylon line as long as the shrouds themselves (typically 1-1.5x the diameter) fromthechutetotheattachpoint. This will allow the airflow around the chutes a bit of extra wiggle room. When you fold them, fold them TOGETHER so when they deploy they cannot tangle. Tech Jerry SignatureJerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8 >> For no reason other than just doing it, I would like to recover >> an LMR on dual chutes. [quoted text clipped - 17 lines] > > Tech Jerry Re: "fold them TOGETHER" Jerry, by this, do you mean one on top of the other, rolling them up as one unit? If so, how does this make them less likely to tangle? (Never having used two chutes, I am uneducated in the science behind this...lol) SignatureGreg Heilers Registered Linux User #328317 - SlackWare 10.1 (2.6.10) ..... That rifle hanging on the wall of the working-class flat or labourer's cottage is the symbol of democracy. It is our job to see that it stays there. --- George Orwell > >> For no reason other than just doing it, I would like to recover > >> an LMR on dual chutes. [quoted text clipped - 22 lines] > Jerry, by this, do you mean one on top of the other, rolling them up as > one unit? Yes. > If so, how does this make them less likely to tangle? > (Never having used two chutes, I am uneducated in the science behind > this...lol) I have seen separately rolled chutes twist lines (rocket spinning) or one open essentially insude the other. Tech Jerry SignatureJerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8 >>For no reason other than just doing it, I would like to recover >>an LMR on dual chutes. [quoted text clipped - 17 lines] > > Tech Jerry Thanks, Jerry. I can imagine the setup, but what keeps the chutes apart? I did a couple catapult tests (without the additional cord) and the two (stock Estes) chutes both inflated directly above the NC. I was thinking there might be something to cause an asymmetric flow around the chutes, like unequal shroud lengths, an offset spill hole, a trimmed canopy skirt, etc. I'll try the extra cord and see what happens. SignatureGary Bolles summum jus, summa injuria est To contact me; bollesg at comcast dot net http://home.comcast.net/~bollesg/rockets/rockets.html Help make r.m.r. a No Flame Zone > >>For no reason other than just doing it, I would like to recover > >>an LMR on dual chutes. [quoted text clipped - 29 lines] > > I'll try the extra cord and see what happens. On ny lonchutes I also use a slide ring to slow deployment. But then again, unlike some here, I actually fly rockets. Jerry SignatureJerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. (too late) Produce then publish. http://www.usrockets.com Ebay. http://tinyurl.com/6wlp8 > For no reason other than just doing it, I would like to recover > an LMR on dual chutes. [quoted text clipped - 10 lines] > -- > Gary Bolles Hi Gary, I've flown two rockets with dual chutes. Both are the Estes Gemini DC design. When both chutes deploy, they naturally pull away from each other, I'm not sure why. On my big DC, 4X the Estes kit, the twin chutes are each on a 30 foot tether and are separated by many 15? feet. steve >>For no reason other than just doing it, I would like to recover >>an LMR on dual chutes. [quoted text clipped - 18 lines] > > steve Aha. I'd looked around trying to find some "method" that made the chutes separate, but couldn't find anything (at least, nothing applicable to my modrocs and flat canopy chutes). Thanks for the info. SignatureGary Bolles summum jus, summa injuria est To contact me; bollesg at comcast dot net http://home.comcast.net/~bollesg/rockets/rockets.html Help make r.m.r. a No Flame Zone > >>How are the chutes made to generate the horizontal force > >>in this configuration? Are the shroud lines different lengths? It's simply a matter of the airflow around the 'chutes. The air 'coming up' within the diameter of the 'chute has to go somewhere. It flows radially and spills out the sides. That airflow forces the 'chutes apart. |
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