People can tumble in free fall, knock themselves out, and your uuggghh "third, or tertiary - which one is it?" parachute won't do much good if it opens while your spinning hundres of RPM in a free fall.
Remember the "cypress-what" that one poster knows nothing about? It's an automatic activation device, computer operated, device used to open the reserve parachute, with no intervention from the jumper. A tumbling, unconscious jumper spinning "hundreds of RPM" (that was pretty laughable) jumper will have the cypress-equipped reserve just like if he were conscious, stable, and fully functional.
Ever seen someone spinning hundreds of RPM in freefall? Ever been in freefall?
USMC mech, you almost made me misty. Get a grip on reality and deal with what you see and read. You have the option of not reading it...not changing what I write. Tough.
I would consider skydiving's risk to be fairly close to the risk level of single engine IMC.
Based on your extensive experience with both? Or based on the uninformed opinion of the casual observer? Having watched a video doesn't really count as experience, and one is hard pressed to lend credibility to an asessment of danger based on watching the video...however truly frightening it might have been.
I've deployed reserve parachutes during malfunctions on jumps, cleared malfunctions on jumps, landed reserves and main canopies on airfields, in fields, in the brush, in cactus, on hillsides, and even in strong winds and at night. I've had the learning experience of landing without power after descending from IMC following an engine failure in a piston powered single engine light airplane...and landing on a gravel strip. A long time ago, something I won't be repeating, something from which I learned...and my opinion is drawn on some very vivid experience.
My last parachute malfunction occured a couple of years ago during a sport jump. It occured during an approved modification to my vector sport rig. On the first jump with a new pocket for my pilot chute, I experienced difficulty extracting the pilot chute, made two attempts, and deployed the reserve. I landed without incident and even recovered the free bag. Another jumper on the same load also experienced a malfunction...a professional jumper, photographer, and competitor who works internationally. Both of us stowed our gear and were on the next load for another jump with backup rigs. Had it been "dangerous," neither of us would have been there. In fact, I made the next skydive a two-way with his girlfriend and partner.
The issue of injuries or fatalities while landing was raised...
You do a great job explaining how safe instrumentation and multiple parachutes are in skydiving, but for some reason you choose to bypass discussions on the dangers of approach and landing with a parachute.
That really has nothing to do with or any comparison to flying single engine piston driven light airplanes in instrument conditions...more akin to trying to land them...and there are more than enough landing accidents with light piston driven airplanes to make that a reasonable comparison. Both are fully controllable, both have a high potential for a safe arrival, and in both cases, stupidity can lead to some unpleasant results. More people are injured or killed landing good canopies today than from parachute malfunctions...even with the few malfunctions that take place...but then a heck of a lot of pilots are injured or killed by landing accidents, stalls and spins in the pattern, etc...including the pilots of the cirrus in Lancaster this past week who were in the pattern AND tried to use their CAPS parachute system. Go figure.
You're attempting to cloud the issue with confusion...making ridiculous comparisons that are nonsensical and borne of absolute inexperience with the topic. Doesn't fly.
Since we're using skydiving with multiple backups as examples, I would like to point out, the fact that many new single engine aircraft do,
use two sets of batteries, two alternators/buss systems, or perhaps a backup alternator attached to the vacuum pump pad, and/or smaller backup batteries tied to essential instrumentation.
A backup generator attached to a vacum pump pad?
Few single engine light piston driven airplanes have any redundancy at all.
And, if the engine DOES suffer catastrophic engine failure over a rugged mountain area at night, or DAYTIME ------
then hope you're flying a Cirrus!
First of all, we don't do things in aviation based on "hope," and second, the Cirrus doesn't have a very enviable record, thus far.