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is there any person who can send me some picture of Multiple Bridle Attachment and little explaination a bout ?

https://www.youtube.com/watch?v=kNBZRB0_PK0

http://www.apexbase.com/manuals/18-20_Multi.pdf

Sorry, no photos, just video and sketches :)

Two point or four point multi?

Four point please .

In my opinion the 4 point multi should only be used in very specialized circumstances by experienced jumpers who know the risks.

In cross wind deployments the outer attachment points can cause the canopy to spin during extraction because one of the outer attachments is loaded first.

I'll try to draw up some diagrams, but basically I'd only recommend using the 4 point multi for full terminal or zero wind jumps.

I'd recommend just removing the outer two attachments and using it as a 2 point multi.

I have around 100 jumps without multi and 2200 jumps with 4 points multi on Fox, Fox HTS and Fox ZP - 99.9% slider up.

without multi ~100 slick jumps, with multi, ~850 slick jumps, ~450 wingsuit jumps and ~900 tracksuit jumps in the mountains, sometime with medium to strong wind.
Some of my friends jumps with multi (4 points) too and have the same feelings.

If i can understand your theoretical assumptions about opening in subterminal speed with cross wind, my stats tells a totally different story :
Multi is a nice tool that give a perfect timing opening (swiss precision openings ) with a very low rate of off-headings ...

Multi rules !

Theory is when you know everything but nothing works
Practice is when everything works but you don't know why

How many of those jumps were terminal?

The issues I've seen happen when the wind speed exceeds the fall rate at deployment.

Have you seen the video shot by the Swedish guys about ten years ago? Where they sat at the opening altitude on an antenna and filmed the deployments?

I'll say around 60/70% terminal. But some of these terminal with ... too much wind count like sub-terminal with less wind

I don't remember this one ...

Here we jump mostly cliff.
And even jumping subterminal wall with wind speed higher than deployment speed is not a good option. So I think you talk about antennas.

So maybe for antennas and bridges multi is a bad tool. For cliff it's a nice one ...



Edit : add array free-fall time / speed :
So sub-terminal is roughly before 8 seconds. 1 to 3 seconds are for pussies slider down (on solid objects) After 4 seconds delai, speed is higher than 100km/h ... don't know lots of people jumping in that wind, even from antennas and bridges So is multi a problem for slider down, not subterminal ?!?