Re: [jeriko13] F111 vs Ultralight canopy ..
I have about 700 jumps on an UL Flik and Lobo with 3/7 venting.
The first 1000 were on standard F-111 Fliks with 4/7 venting.
I wouldn't worry about the vent configuration. In fact, I prefer the 3/7 after jumping the canopies for a few years. I haven't had a chance to jump an UL canopy with 4/7 venting but I like the idea of the center cell being vented.
One thing I have noticed about the UL canopies is that they open hard slider off... or maybe I am just getting old. Either way, they perform well on low stuff. In fact, if you are planning on freefalling low, I would recommend whatever you get to be UL. A lighter weight canopy means that the PC has less work to do and can extract the canopy to line stretch more quickly. I have a lot more confidence in UL vs F-111 when I am freefalling below 200'.
For deep slider off delays on the UL Flik, I started playing with PC size and additional reefing to reduce opening shock. It seemed to help but I didn't get enough jumps to conclusively say one way or the other and it isn't something I would recommend to newer jumpers.
As far as the material strength, it is a lot tougher than anyone initially expected. It wears well. My UL Flik has almost 500 jumps on it with most of those being in Arizona and Moab. It still flares and flies well. It does seem to be a bit less resistant to tears, although not nearly enough to keep me from jumping it everywhere.
I have managed to put a few small holes and a 3" tear in the Lobo though, but nothing more than I would expect on any canopy. This winter, I spent a lot of time looking for alternate landing areas at Camelback... most of these LZs were smaller than 3 ft diameter and surrounded by cactus and spiked, devil bushes. It has been landed in some of the gnarliest bushes, rocks, and debris out there and has only had only taken minimal damage. It gave me a lot of additional confidence in the strength of this material
Now with that being said, these were situations where the canopy landed in the bush after I had landed. My body weight was never suspended under the canopy when it made contact. I don't know how the material would hold up in the event of a strike other in-flight collision.
For me, the weight, comfort, and performance advantages of UL far outweigh standard F-111. Either way you go, the best way to make any canopy last is to fly it like a ninja and take care of it.