cobaltdan
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Everything posted by cobaltdan
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no, not currently. but we were the original manufacturer of the nitro, which precision has resurected and renamed the nitron. this is where precision got the idea to use hma. i have safety issues with hma, all of which have been voiced in a previous thread. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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safety first, you did the right thing... with that said, just for disscusion: it looks like from the video and timing you were about 2200-2500' when you choped and the spin was just about sorted. for next time you did have a margin of safety to continue here. you were not 5 revolutions from impact. only mistake i can point out for next time is you did not straightening your links. it is possible that there is nothing wrong with the canopy, just that it is a more twitchy design than you are used to and havent adjusted yet. that said you do nothave to conquer a design that does not suit you, there are many to choose from. one will just feel right... sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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ohh and it looks like your brake setting is a little high. it is hard to tell from one piece of video but check the brake lines. dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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the video does look like you are asymmetrical in the harness (the canopy seems quite sensitive too). it also looks like you did not do anything to correct the situation other than chop. this surprised me because i believe i read that you are a high experience elliptical jumper....? i.e. immediately straighten your risers so that the links are level. next/simultaneously, immediately kick to spin your body in the opposite direction to the twists. dont simply go for a ride, control your situation. reserves are there to save you but they are your last chance. exhaust your other chances first. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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i would be concerned about recommending 800-1000 jumps. to be on the safe side it should be more like 400 jumps provided with proper care. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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for this discussion, there are strong differences between a very high aspect ratio canopy (paraglider) and a low aspect ratio canopy (skydiving). many dhv1-2 paragliders do not even have a constant angle of attack across the planform. atair recommendation for all our skydiving canopies: full flight in turbulence, no partial brakes. sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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hud altimeter: done. come check it out pia. dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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hi alan, "Any way, I asked if you had video showing a standard Cobalt consistently taking 1000' to open. I guess that would be a "no" for now." i have plenty of video on consistant 800' openings, with tandems i also can show consistant openings of double that. there are video's posted on our wed site that should be satisfactory. i agree with you that most modern soft openeing canopies fall in the 600-800 range. "Hey while I have you, what are your thoughts on using 1/4 to 1/2 brakes while landing in turbulence under a Cobalt?What kind of factor would wing loading play in the 1.2 to 2.2 range?" i have posted on turbulence threads in the past a recommendation of full flight through turbulence. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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silver box: it is an part of our autonomous precision guided parafoil system dubbed ONYX. the box is magnesium, contained internally is our flight computer with integral gps/inertial sensors and actuator system. it is powered by compressed nitrogen. sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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i am really only interested in maximum rates. i.e. if you calibrate a gyro for 300 degrees per second, and you subject it to 400 degrees per second the overanged data from the gyro screws up your filtering math and the system will spit out garbage for a while, even after the turn is finished. when done the unit will be able to record and play back a complete acount of a canopy flight. i.e. 3d position and orientation and riser force. different canopy flight characteristics can be compared with a virtual playback of actual on a computer. so crank hard and post results ! thanks, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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check with sandy for ri, he is one of the only rig manufacturers to actually take the time to perform volume measurements of our canopies. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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i am working on a new sensor for our datalogger that will record position, 360 degrees in all axis. yaw, pitch and roll. for gyro calibration i need to set the filtering algorithms with the maximum turn rate they may see. i would like to solicit information on all types of canopies. anyone willing to help would be appreciated: with video of your canopy performing spirals. count frame by frame each 360. post back your canopy type, wing load, type of spiral (riser or toggle), exact # of frames per 360 (preferrably post frame counts from several successive 360's). thanks, sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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if you can you describe your flying position maybe we can make some pointers? dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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problem is that as your canopy gets smaller the drag of the pilots body remains the same. it does not scale down with the wing and becomes proportionaly larger. given the same trim a c25 vs a c75 will fly way out in front of the pilot, as the pilot is the largest component of the systems drag. i estimate that a 9 cell cc50 would be about the smallest someone like chuck blue or mikael stevens could repeatedly safely land. i estimate on our xbraced onyx a 40 would be about the limit. with a rigid wing (hang glider) we sucessfully played around with a 33 sq ' glider. such wings are more efficient and you have the benifit of being able to pilot them in a prone low drag position which is not very practical in skydiving. the smallest production hang glider i know of is about 120'. but then again the entire point of gliders is to be able to soar, not simply decend and land. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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i never told anyone to shut up and keep in mind the exchange has been part on line and off. i simply said back up your comments: use the equipment properly, i.e. do not stack the experiment and jump with belly video, which i even offered to provide. video does not lie. good or bad i would post the results. can't be any fairer than than. i thought it would be nice for tom to be involved since he is the only one complaining. either way i will post belly cam footage of various base canopy openings on our web site for everyone to compare. probably will be up by pia. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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maybe it could be a new trend: tracking canopies... we could all do flock dives and then when you cut, it could be your pilot and rsl out your main? sincerely, dan ps. to answer some questions: it has never been live jumped (yet), and flying it off the back of a pick up truck shows the c25 to be extremely sensitive, 8" of toggle can 360 it in place. i think eric will just wind up turning it by tilting that giant head of his. for deployment i made a small static line freebag the size of a school kids milk carton. it is to be velcroed to your helmet and then static lined. Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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tom, this has been beat to death on blinc, by robert & kathy, and by on the side stane and robert. you just do not want to listen or admit you are incorrect. i simply took a stab at it after hearing you advise one too many times at bridge day that "troll open like shit" to anyone that would listen. to the point where i believe it hurts your credibility, seeing as you are the only one who thinks so and refuse to jump our recommended size. robert and kathy have tried to bend over backwards to acomodate you, as have other manufacturers, but you seem to want the attention more than the information and it is wearing thin for alot of people. i will move this off line and simply leave off with the original offer. "jump a properly loaded troll and i will provide a belly cam to wear for evidence and analysis." ---video does not lie---- end of rant. dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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not posted on this forum (but covered on blinc) is that tom's opinion is based on using a troll outside of our (the manufacturer's) recommended guidlines. it would be like me telling everyone "i am highly experienced and in my experience stilletto's suck", but leave out the fact that i only jumped one at a wingloading not recommended by pd. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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hi cpoxon, i see your point. i have yet to base my wingsuit, as i have a couple hundred wingsuit deployments but no zero wind exits, i am more concerned about the exit. probably balloon jumps are the best practice before attempting a wall... sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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hi tom, no retrofits on other manufacturers canopies. and i am sure once you jump a troll within the manufacturers suggested guidelines, you will be thrilled with the openings. proof is in the putting, to restate a previous offer: jump a properly loaded troll and i will provide a belly cam to wear for evidence and analysis. until then kindly stop with the negative comments. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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i think chuck could handle a c 50 ! dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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sorry, i havn't taken them yet. basically the valves are 'duck bill' style check valves. the full width of the cell and about 8" long on the 'bill'. they seal very well and add vented opening performance to the troll without the usual side effect of decreasing flight performance and flare. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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smallest x-braced ever landed is an icarus 46 smallest 9 cell ever landed is a cobalt 65 Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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pic: trade show booth with heather. the 25 is yellow and purple and was reinforced for 500# exit weight (i would tell you why but then i would have to kill you) i call it my tracking parachute. dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)
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i just sent a cobalt 25 to eric butz. (with the condition that he will not try to land it.....he reluctantly agreed) sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)