cobaltdan

basically the center point for your rotation is much further away from you in a carve. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

the only complaints ever seen have been from our 170's. initially they were designed to open a little faster as they were predominately being placed with newbies. after the last posted thread on the 170 and with the great success of our comp 350 tandem i began work on a comp model cobalt 170. just finished the patterns and they will be available soon. also patterned is a 220 (predominately for military, but they will double as a brilliant student canopy). sincerely, dan ps. complete explaination of the 2 stage openings are available on our web site www.extremefly.com if you have any questions beyond that give a call and i will be glad to discuss. office # 718-923-1709 Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

i am the opposite: the day i am no longer scared, i will quit. fear keeps me sharp. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

we are selling alot of cobalts to russia right now. i can ask our distributor about them if you like. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

please check out: http://www.extremefly.com/aerodynamics/canopies/tandem.html if you are going to demo a sigma or ez definately demo the cobalt 350 side by side. openings are consistantly 1500' . max opening force is extremely low. the c350 is an extremely efficient wing, having a spanwise cross braced nose that dramatically improves the airfoil. superior glide, flare and performance in turbulence over all other tandem canopies. not prone to twists, and is extremely stable in induced twists during deployment. toggle pressure is light but a hair above the icarus. no problem landing 820 pounds on only primary toggles. capable of fast turns with low drop in altitude. live jump tested and datalogged up to an exit weight of 1000 pounds and deployment speeds of 190mph. no other tandem even comes close. if you have any interest demo's are available through our office. sincerely, dan www.extremefly.com ps. we went to such high weights in our tests as they were proformed for the military. we demonstrated the highest speed deployments and highest exit weight the military has ever seen. the highest performance tandem the military had previously was a pd beefed up 420 with a max capability of 130mph at 650#. Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

you do not really want to static line competition canopies. plus then you couldn't geak the camera with freestyle exits. in the past, we have simply made very cheap freebags for competition. in bright orange with a small amount of shot sewn in so they dont drift to much, as such they are usually easy to recover but if you loose them so what.... imo its the simpliest solution, no extra procedures, no added malfunctions do deal with in the air... sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

my past experience with stillettos is that swoop distance will begin to taper off after 1.8. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

"Well....I figured if the brake lines had shrunk almost 5 inches it was a good bet the others were trash too. " all lines do not shrink. as the canopy spreads the tension is on the outer lines against the slider gromets... sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

canopies are constructed cell to cell from one side to the other. varying seam tensions during sewing can result in asymetries in the final canopy. most canopy manufacturers use multiple seamstress to work on each canopy. even if the same machine and fabric puller was used there will be varying tensions. the tollerence on your canopy is probably as broad as 4" in span accross the nose. if this is the reason for your turn, try to have the canopy replaced if it is a severe turn, if it is slight it can be corrected with modifications to the stabilizers. ps. what do you mean by "funny". sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

chuck is just ribing me for not getting him his onyx yet. (which btw was shipped on monday) sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

bacically because they are more efficient, and also to provides additional spreading force to the flexible structure. airplane wings would look similar if the fuselage had to be located significantly lower than the wing. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

botom line is: is it possible to demo cobalts in europe ? Dan ? yes, please contact stacy in our office 718-923-1709. or via info@extremefly.com sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

your slider effectively does the same thing as a tail gate. tail gates are needed when jumping without a slider which is not an option for skydiving... sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

"Sure he did, he sales canopies. " actually i design canopies... anyway as recommended demo time. i would start with any modern 9 cell design and decide if you want a 7 or 9 cell. then demo all in the class choose what suites you best. 9 cell canopies to demo are cobalt, sabre 2, hornet, and safire. (listed in order of my personal preference) sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

about 200' dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

you will not notice a foward speed increase only a performance increase, i.e. softer openings, slightly faster turns, more lift, glide, swoop and flare. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

we do not offer the h-mod from the factory as performance wise it is in between the cobalt and the competition cobalt. as far as offering aftermarket h-mods on cobalts we support howard adams and joe bennet. we have been reluctant to recommend an after market modification to our canopies by a third party as it is out of our control to ensure the work is done properly, but after the last two years these riggers have definately proved a record of excellence. btw for anyone new to this thread howard adams is the designer what we dubed the h(oward)-mod. we will be posting their information on our web site soon for u.s. customers. sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

What canopies would those be? there are dz's that teach begineers on spaces, safires, sabre2, hornets, and cobalts.... all are elliptical and all properly loaded are suitable for begineers. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

probably not to worry but: i would seriously suggest that this a question for your sons orthopedist...(not this forum) sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

just thought i would point out that there are an increasing amount of dropzones that are training students on modern "elliptical" canopies. there are a plurality of elliptical canopies specificaly designed to have suitable flying traits for begineers. safe loadings for students range from .8-to 1.2 depending on the design and what measuring method the manufacturers uses to determine area. we noticed a gap in available canopies for student training quite a while ago, and have just finished testing on a 220-240 cobalt. sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

my experience with both canopies has been that a stilletto will definately outswoop a safire at equal loadings...but that would not be my deciding factor on a purchase as neither canopy is a contender for swoop competition. do you really care if one goes 30' further than the other? demo them both and choose the one that you take to best ! and demo others in the class as well... my notes on the canopies are: the stilletto is a fun wing but there are more efficient and polished designs available now, basically it is a classic and there are better choices. safire i do not care for as at the wing loadings i like to fly i find the flight carateristics undesirable. i.e too short a control range and a tendency to bow tie in the slightest of stalls. this was my experience at 1.75 wing loading (i normally jump a cobalt at 2.2-2.4). i found the canopy very easy to bow tie in a swoop. i have since watched other high experienced and even sponsored jumpers at our home dz who jump safires bow tie their canopies coming out of the corner or in their swoop, quite often. i believe the canopy is better suited to wing loadings below 1.6. there are people that love the safire, it is just my personal preference to go with a canopy with a deeper control range and no tendency to bowtie in a shallow stall. simply demo all and make up your own mind. sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

film you deployment and watch in slow motion. you will find it is the nature of the design. the center cell catches air first and instantly pressurizes the canopy via the crossports. the canopy expands and with the slider up the leading edge canot expand straight and snakes until the slider is about 1/3 to 1/2 way down. it is this violent snaking of the leading edge that causes off heading deployments. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

kerry, i will pass on the message to stane & robert. best of luck with vladi's ball, i think it is a great design. btw. something that we found out when building our spacedarts is that if you get away from a ball shape and go towards more of a bomb or rocket shape. the difference in drag is very significant. with the bomb shape we were using 1/3 the weight typically put into a ball for the same fall speed. if you like i can email you a 3d autocad file of our space dart shape to experiment with. sincerely, dan Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

hi heather, we have developed our own dataloggers and sensors for testing canopies. when we first started datalogging forces during deployment we noticed some interesting things. one of my primary interests and a driving force behind the development of our cobalt was safe high speed deployments. with large pilot chutes, especially at high speeds when you datalog a jump and look at the graph of force vs time you will see a seperate peak shock from the pilot chute/line stretch to when the canopy comes out of the bag. with a cobalt you will see 3 distinct peaks: pilot chute, stage 1, stage 2. with large pilots and high speeds the pilot shock can exceed the force of the first stage of the canopy deployment. we realized that the pilots we were using were unnecessarialy large and began testing progressively smaller sizes. first they were dumped from a pickup truck with a load link on them to record peak and steady force, then the chosen sizes were jumped. the resulting graphs of the jumps showed dramatic reduction of the first peak. based on this testing our recommended sizes for our canopies up to 135 is 22" zp, and 24" above. note: on a recent tandem test drop we recorded peak force from the drogue at line stretch of 26g where as the max canopy force on opening was 6.4 g. anyway so to answer your question we are very safety oriented when it comes to high speed deployments. we routinely demonstrate deployments at speeds that would kill you on competing canopies. as we market our canopies on its ability to be safer in the advent of a high speed deployment it is important that they are used within our tested and designed limits, i.e. using a properly size pilot chute. sincerely, dan www.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)

"I've did some reading about pc and openings and it was explained that a zp pc would pull harder, almost stopping the canopy untill you reach line strech and you accelarate the canopy again. " there are alot of unfounded bs tales in this industry. this is one. a zp pilot can be made to pull what every you want. as can an f111. it is a function of their area. we have recorded force from pilots ranging in size from 28" -18". we recommend zp pilots because the fabric does not deteriorate the way a f111 does. ultimately they last more of less the same number of jumps (because the kill line shrinks) but the f111 will not be consistant over its usable life. go zp kill line collapsable not f111 and size properly. properly being the canopy manufacturers specific recommendation, not the rig manufacturers standard recomendation. sincerely, dan ww.extremefly.com Daniel Preston atairaerodynamics.com (sport) atairaerospace.com (military)