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  1. I

    Sold Rocketman PA 18’

    What were you looking for as far as style and color? I have a couple large chutes laying around.
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    Quick look up chart - Decent rates - anyone have one?

    My suggestion is to just print out a weight vs descent rate graph for each chute you purchase or make. That way you can take the graphs to the field and decide which chute works best with the given conditions and rocket. You could probably even put all of your chutes onto one graph for a single...
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    recovery ?? who's chute to use ???

    As you can see, these suggestions are not based on your needs but simply throwing out names of chute manufacturers. There is even a manufacturer that did not probe your recovery needs but already offered a suggestion. For all we know you have a mass budget of 48 grams and a restricted volume of...
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    recovery ?? who's chute to use ???

    If you try to calculate the Cd of the Rocketman chutes based off of their tables you will see that their reported Cd is off. It is not the 1.85 or the .97, the average between all sizes of their standard is a Cd of .8359015926 at 17fps. Lowest is a Cd of .74 and highest of .90. Also, if you...
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    An "R"-powered rocket build

    Make sure the chute is packed tight and does not just fall out of the bag. The pilot chute should strip the bag. In this manner you will prevent a lot of issues. A perfect example is Tom Cohen's 60ft that I believe has inverted on every flight. While it still inflated and provided drag the...
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    recovery ?? who's chute to use ???

    First decide what are your main parameters with the chute. You are about to get a few dozen replies and in the end you will not have an answer. Decide what factors are most important; cost, quality, look, performance, how unique the chute is, weight, pack volume, durability, use with accessories...
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    Rocketry Calculator

    With all of the materials, manufacturine techniques, packing/ storage and aspect ratios used in streamers you will not be able to come up with a perfect calculator. There are some interesting research papers on flags and streamers that focuses more on the material mass and frequency of...
  8. I

    I'm about to cut out a spill hole in all of my parachutes.

    Then rotating chutes are the way to go. They are ultra stable and drift slightly less. Most are lighter than comparable chutes and have a higher Cd.
  9. I

    "Ram Air" Parachute w/slider recovery

    Similar set up. In the post above I do not have the slight apex pull down.
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    "Ram Air" Parachute w/slider recovery

    The kill line is automatic. right after the main is pulled out of the D-bag, the pilot inverts and collapses or kills itself. In the pictures you can see the pilot chute cocked or in a ready position and if I pull the kill line then the chute inverts. The kill line is anchored to the main and is...
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    "Ram Air" Parachute w/slider recovery

    For a collapsible pilot chute, download the FAA parachute rigger manual for free. It is simply routing a kill line from the apex of the pilot to the connection point on the chute. This kill line can also be rigged to pull down the apex slightly in an inflated state which can provide up to 20%...
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    "Ram Air" Parachute w/slider recovery

    A few quick thoughts. Deploying just after apogee is probably the optimal time since ram air parafoils need speed in order to align properly. The point of a pilot chute is to drag the main into clean air so we there it's increasing the riser length or increasing the bridle length or both should...
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    "Ram Air" Parachute w/slider recovery

    Your post is two fold. First, sliders are used and available but are not really beneficial in hobby chutes to lower forces but are more suited to control lines and work out tangles and twist. The reason they are not really beneficial is that in order to restrict the canopy opening the slider...
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    Recon Recovery Chute Repair?

    I wouldn't use the thread since it will change the canopy's shape a little. The ripstop tape works great but I would recommend a repair for long term. You can probably contact any parachute manufacturer and they should repair it.
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    Packed Chute Size

    Do you like seeing the volume requirements by dimensions or volumes?
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    Packed Chute Size

    Most of the time you will find what volume is needed by figuring out what pack density you are comfortable packing the chute at. For most flyers it is .20oz/in^3. Packing at .30oz/in^3 is close to the limit of hand packing. All you need to do is divide your chute's weight by the pack density and...
  17. I

    "Vortex Ring Decelerator"... latest Apogee Newsletter

    BAMA Recovery Systems actually makes rotofoils down to 9 inches.
  18. I

    Chutes & Ladders. Okay, just chutes...and questions...

    The best in the biz for hemispherical chute would have to be Spherachutes. They are running a deal with 10% off and a free 18" chute, so you get your main and drogue at a great price.
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    Parachute patterns

    If you need a spreadsheet for the Viking DGB ratios, let me know. Very simple to make.
  20. I

    Parachute patterns

    The French fell has proven to be the most efficient parachute seam for radials. Both seams can use the same amount of allowance for the seams. It is really up to you on how much allowance you put in. A true french fell uses 2 loaded stitch rows where a flat fell only uses one. There are videos...
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