On Saturday, June 22, 2013 6:01:54 PM UTC-6, B4soaring wrote:
On 22/06/2013 15:01, Bill D wrote:

On Saturday, June 22, 2013 1:41:41 AM UTC-6, Alan wrote:

In article Bill D



writes:







I'm positive that if it's done right, winch launch is far safer than aero t=



ow. Germans suffer one accident on average every 180,000 winch launches wh=



ile we suffer one every 24,000 aero tows. I know there are cultural differ=



ences but, presumably, we're pretty good at aero tow and they're at least a=



s good at winch launch so the comparison is probably valid.







But, what is the severity of these accidents?



The severity is exactly the same for both aero tow and winch. The German LBU accident statistics are



available on-line just as the NTSB data is. I suggest you verify them

yourself.



I have no idea where the SSF got their numbers but it may have been the UK since no translations



are required. 2011 data shows the UK suffers one accident every 16,000

launches while



Germany suffers one every 180,000. German numbers are roughly

comparable to the rest of continental



Europe. The SSF needs to take another, wider look.



Bill makes the classic mistake of the amateur statistician - failing to

understand the different definitions & methods behind the statistics he

quotes.



None of the statistics Bill quotes can be relied upon to be an accurate

comparison.



Ed.

Bull ****! I've spend years investigating these reports and vetting the analysis with experts. These are not statistics or summaries, they are actual numbers obtained from the respective national aviation safety boards who use the same investigative techniques. They are 100% reliable for comparisons.

There is no way to overcome an order of magnitude difference no matter how you spin the numbers. If you don't believe it, try to make the numbers come out the other way.