Re: [fab777] BASE Fatality 11/11/2005
In reply to:
I've been reporting two cases of O/H, which were controlled by riser inputs, and THEN was made the decision of flying the canopy between two wires, that I could SEE. this on particular objects whose clearance between wires allows that. Maybe I didn't make myself clear. Anyway, you didn't answer the question.
I'm sorry. I didn't realise it was against the law to reply to or answer specific parts of internet posts without answering the original question of the post.
The above tells me that the decision to fly between the wires was made AFTER deployment and in response to the off heading. Hence my post is totally relevant in that heading correction is the KEY, MOST IMPORTANT, MAJOR factor in the above scenario. If the heading is controlled, then you will not be flying between the wires and the issue becomes less relevant.
Now, if you intentionally decided to fly between the wires prior to exiting, then it is a different story. That requires good flying skills. If you are intending to "fly the wires", you should have lots of vertical space between the wires or the angle of the wires should be close to your glide ratio. Can I suggest some CRW training to teach a bit of canopy relative skills? Anyway, have fun, don't mess up.
Now, to your original question......
In reply to:
What I'd like to know is: what's the proportion of wire strikes due to obscurity. That is, are those strikes mostly simply due to offheading, or would most of them have been avoided if the jump had been carried out in daylight?
My concern come from the fact that I've been flying through the wires a couple of times after offheadings. At the time, it seemed safe to me since I could see what I was doing. On the other hand, I've been jumping only once a wired A in obscurity, had an offheading, and didn't feel confortable AT ALL, 'coz I could see where the thing was... even knowing I had much clearance, after a 12" track.
Accurate statistics would be hard to come by. I think there are several reasons for wire strikes:
- off headings
- not seeing the wires clearly in flight and hitting them (especially in conditions such as complete darkness or if you have the sun in your eyes)
- not even recognising the wire hazard in the first place (I have actually heard of a jump where a person clipped a wire - when quizzed on landing, he didn't even realise there was one there!!! There have also beed cases where beginners have jumped four wire towers but believed that every tower is a three wire tower - hence they have not allowed for the fact that there is only 90 degrees of clearance instead of 120 degrees).
- intentional fly throughs but poorly estimating the flight path and/or clearance of the canopy between the wires.
- and one of the biggest reasons? . . . not understanding wind direction. strength, and affect on canopy flight causing a parachutist to back into support wires or the tower itself. This includes jumping in the into wind sector, and on bigger towers where there was inadequate separation from the object in freefall and being pushed into the wires due to a strong crosswind component.
In reply to:
To make it simple: should we consider guy wires dangerous in themselves, or are they dangerous in certain circumstances...
BTW, do anybody know more about this one? Night/day, winds, etc...?
Dangerous? YES. They are things you can hit. Anything you can hit is no good in BASE jumping. It should be part of your risk management, pre-jump planning, or whatever you want to call it, to allow for things you can hit. And parachutes don't like it when you disturb there ability to maintain pressurisation (i.e. your alter their airfoil characteristics and fluid flow around them).
The risk factor increases if:
- you can't see them
- you don't know they are there, or how many, or how far apart
- your heading control is poor (slow, ineffective)
- your ability to read, and allow for various wind conditions is insufficient
- etc.
Anyway, fab777, I am not directing this at you personally, its just potential learning information. And I am more than happy to be corrected if my opinions above are incorrect. Just give me the facts and data.
All the best.