what are the lenths of coard on a parachute?
459159
You need to be a bit more specific as there are various lines/risers on a parachute.\n\nDrop me a note of what you need and I will give you an answer.
544046
they are called suckers on the ends of the tube feet.  they are controlled by the water-vascular system in echinoderms, such as starfish.  \n\ngood luck with the dissection!  i did it a few weeks ago...make sure to check out the two stomachs!!
1176116
Its usually known as a frustum . Think of it as an upturned Bucket , essentially , top part of the a  cone cut off by a plane perpendicular to the axis .
461335
Depends if a 'round' parachute or a 'square' (ram air) one.\n\nAssuming it is the round type it will be about half as tall as it is wide.\n\nDrop me a note if you need more info.
69115
Here you go!  Retrieved from Google Images\nhttp://www.bestdock.com/pics/extras/Rope.JPG
1075538
http://cookeinsurance.com/html/in_hail.htm\n\nhttp://www.canhail.com/\n\nhttp://www.state.mn.us/mn/externalDocs/Self-Certification_for_CROP_HAIL_-_Pilot_Program_052803020316_certcrophail.pdf#search='crop%20hail%20insurance'
108099
Silk has not been used for a very long time due to instability and tendancy to degrade over time.  Most parachutes are now made with rip-stop nylon (not sure if this is a patented product or a generic name).  Drop me a male if you need any other details :-)
837528
The U.S. government has many such secret anti-gravity aircrafts which they test in the western U.S.   This is one of them that you and your friend saw.  See the attached link for a picture.
739525
www.coccyx.org  Check this site it night provide answers for you.
527451
wings are called fins on a rocket and the shape and size of the fins affect the stability of the rocket and can catch the wind on the way down the slow it down on the descent. a parallelogram shape is more efficient. check out the website soinc.org. at the top go to division "b" events then bottles rockets the event.  there are sources on that page.
109037
Get a copy of "What Color is Your Parachute?" By Richard N. Bolles (check your local library) It is an excellent resource.  see www.jobhuntersbible.com
588723
Here's a firm that has German parachute wings:\nhttp://www.milprom.com/German/badges/superior-badges-3.htm\n\nIn the German army the Parachutist Badge (Fallschirmschützenabzeichen) was first established by order of Hermann Göring on November 5, 1936. It was first awarded to all soldiers of the Luftwaffe who finished the parachute training and accomplished the required number of jumps. The award was made of silver and depicted a diving eagle holding a swastika in the claws and surrounded by a silver wreath. It was worn on the left breast, above the pocket. On September 1, 1937, General Werner von Fritsch introduced similar badge for all the Wehrmacht soldiers who also met the requirements.
180357
Look it up under "freefall" simulator.\n\nHave fun.\n\n=8-)
494436
Assuming it is for a toy/model.\n\nThe only consideration is to make sure all of the lines are tied so the load hands level and does not cause the parachute to tilt.\n\nFor a dead load like (say) a square block I would tie them all to a central point on the top (and secure knot will do).\n\nFor a more human load (e.g. an action figure) you would be best to tie the right hand 6 to one shoulder and the other 6 to the other (like a normal parachute) - I would tie a string loop under the armpit and over the shoulder on each side (possibly with a string between them to stop them slipping).  The 6 strings on each side can be simply knotted to these loops.  This is pretty much how a parachute is fixed in real life although it is more of a complete harness.\n\nI hope that helps but if you need more info drop me a note.\n\n=8-)
619362
It is called a contrail,  condensation trail or vapour trail.\n\nCombustion of airplane fuel generates steam in the exhaust. At high altitudes the cold temperature of the atmosphere causes the steam to condense into water droplet or ice crystals (depending on the temperature). \n\nThe condensed water droplets / ice crystals disperse light, making them visible.
1143368
Change the question to "fall in air" and think about it. A parachute drops slower than a rock. The shape influence the speed due to drag.\n\nSame for water.
963798
front stagnation point\nhttp://www.fluidmech.net/tutorials/raindrops/drop_flow.htm\nhttp://www.fluidmech.net/tutorials/raindrops/raindrop.htm